<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2025 Workiva-->
<!--r:ab6c8579-7074-414e-bea3-4998b454a976,g:d3d10bf2-e9ba-448e-a320-4662003f3abf-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/ConsolidatedStatementsofIncome" xlink:type="simple" xlink:href="bhrb-20250630.xsd#ConsolidatedStatementsofIncome"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/ConsolidatedStatementsofIncome" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_4b9edd70-c48e-4b1a-b5e8-f0b47663ab2a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_us-gaap_StatementTable_4b9edd70-c48e-4b1a-b5e8-f0b47663ab2a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_837c4ab1-9889-4c96-a83e-5662a3fa4eba" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_4b9edd70-c48e-4b1a-b5e8-f0b47663ab2a" xlink:to="loc_srt_ProductOrServiceAxis_837c4ab1-9889-4c96-a83e-5662a3fa4eba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_837c4ab1-9889-4c96-a83e-5662a3fa4eba_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_837c4ab1-9889-4c96-a83e-5662a3fa4eba" xlink:to="loc_srt_ProductsAndServicesDomain_837c4ab1-9889-4c96-a83e-5662a3fa4eba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_1268908e-a37e-4319-91f8-e5e0d2055c1c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_837c4ab1-9889-4c96-a83e-5662a3fa4eba" xlink:to="loc_srt_ProductsAndServicesDomain_1268908e-a37e-4319-91f8-e5e0d2055c1c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiduciaryAndTrustMember_32996b08-6504-4ff2-88ab-b025991e42c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiduciaryAndTrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1268908e-a37e-4319-91f8-e5e0d2055c1c" xlink:to="loc_us-gaap_FiduciaryAndTrustMember_32996b08-6504-4ff2-88ab-b025991e42c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ServiceOtherMember_5fadacd6-3839-4caa-8c42-e169477fe87c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ServiceOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_1268908e-a37e-4319-91f8-e5e0d2055c1c" xlink:to="loc_us-gaap_ServiceOtherMember_5fadacd6-3839-4caa-8c42-e169477fe87c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_41aba4ce-b1c0-44fe-b531-a4371275061d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestAndDividendIncomeOperatingAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_41aba4ce-b1c0-44fe-b531-a4371275061d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_5f3e1c31-bdeb-4802-b6d1-be509768aafa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestAndFeeIncomeLoansAndLeases"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_41aba4ce-b1c0-44fe-b531-a4371275061d" xlink:to="loc_us-gaap_InterestAndFeeIncomeLoansAndLeases_5f3e1c31-bdeb-4802-b6d1-be509768aafa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_InterestAndFeeIncomeLoansAndLeasesTaxExempt_a3d6408d-690c-4101-a2fe-30c12093d66f" xlink:href="bhrb-20250630.xsd#bhrb_InterestAndFeeIncomeLoansAndLeasesTaxExempt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_41aba4ce-b1c0-44fe-b531-a4371275061d" xlink:to="loc_bhrb_InterestAndFeeIncomeLoansAndLeasesTaxExempt_a3d6408d-690c-4101-a2fe-30c12093d66f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeSecuritiesTaxable_1295ff35-47a5-4e41-a5a4-ee1313ff38d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeSecuritiesTaxable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_41aba4ce-b1c0-44fe-b531-a4371275061d" xlink:to="loc_us-gaap_InterestIncomeSecuritiesTaxable_1295ff35-47a5-4e41-a5a4-ee1313ff38d2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeSecuritiesTaxExempt_c846a61b-6afa-4c67-ac70-b0e62206713e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeSecuritiesTaxExempt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_41aba4ce-b1c0-44fe-b531-a4371275061d" xlink:to="loc_us-gaap_InterestIncomeSecuritiesTaxExempt_c846a61b-6afa-4c67-ac70-b0e62206713e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeOther_8ebb5af7-1a4c-4e16-b251-ce7cb2983284" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_41aba4ce-b1c0-44fe-b531-a4371275061d" xlink:to="loc_us-gaap_InterestIncomeOther_8ebb5af7-1a4c-4e16-b251-ce7cb2983284" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeOperating_aad4100c-3166-414b-a40d-4fc33d9613a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestAndDividendIncomeOperatingAbstract_41aba4ce-b1c0-44fe-b531-a4371275061d" xlink:to="loc_us-gaap_InterestIncomeOperating_aad4100c-3166-414b-a40d-4fc33d9613a1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseAbstract_7fee7be8-2d92-4668-935e-7e680c6c38a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_us-gaap_InterestExpenseAbstract_7fee7be8-2d92-4668-935e-7e680c6c38a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseDeposits_0d65c04a-4c5e-49cc-946f-2f7fd4f31f04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_7fee7be8-2d92-4668-935e-7e680c6c38a1" xlink:to="loc_us-gaap_InterestExpenseDeposits_0d65c04a-4c5e-49cc-946f-2f7fd4f31f04" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseShortTermBorrowings_57730c8c-3d01-4119-8dcc-3d12e796cc07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_7fee7be8-2d92-4668-935e-7e680c6c38a1" xlink:to="loc_us-gaap_InterestExpenseShortTermBorrowings_57730c8c-3d01-4119-8dcc-3d12e796cc07" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseSubordinatedNotesAndDebentures_784d0078-d455-4a31-96bd-de40c1034004" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseSubordinatedNotesAndDebentures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_7fee7be8-2d92-4668-935e-7e680c6c38a1" xlink:to="loc_us-gaap_InterestExpenseSubordinatedNotesAndDebentures_784d0078-d455-4a31-96bd-de40c1034004" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOther_b1e36968-dc22-4689-ac43-e8682e621a0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_7fee7be8-2d92-4668-935e-7e680c6c38a1" xlink:to="loc_us-gaap_InterestExpenseOther_b1e36968-dc22-4689-ac43-e8682e621a0a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_b3afb320-d537-4b82-b939-1c15199801ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InterestExpenseAbstract_7fee7be8-2d92-4668-935e-7e680c6c38a1" xlink:to="loc_us-gaap_InterestExpenseOperating_b3afb320-d537-4b82-b939-1c15199801ab" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseNet_deef216c-5e46-49bd-a28f-ff2ccf323217" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeExpenseNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_us-gaap_InterestIncomeExpenseNet_deef216c-5e46-49bd-a28f-ff2ccf323217" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversalLoansAndDebtSecuritiesAvailableForSale_083c8f3c-dfa9-4a9c-ae03-deef53fb6471" xlink:href="bhrb-20250630.xsd#bhrb_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversalLoansAndDebtSecuritiesAvailableForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_bhrb_FinancingReceivableExcludingAccruedInterestCreditLossExpenseReversalLoansAndDebtSecuritiesAvailableForSale_083c8f3c-dfa9-4a9c-ae03-deef53fb6471" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_FinancingReceivableExcludingAccruedInterestOffBalanceSheetCreditLossExpenseReversal_1bd65fb5-dbb8-405a-8048-cf060572ab93" xlink:href="bhrb-20250630.xsd#bhrb_FinancingReceivableExcludingAccruedInterestOffBalanceSheetCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_bhrb_FinancingReceivableExcludingAccruedInterestOffBalanceSheetCreditLossExpenseReversal_1bd65fb5-dbb8-405a-8048-cf060572ab93" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_CreditLossExpenseReversal_1632bf80-5266-4b69-a69b-02af0c183262" xlink:href="bhrb-20250630.xsd#bhrb_CreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_bhrb_CreditLossExpenseReversal_1632bf80-5266-4b69-a69b-02af0c183262" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_297da232-c1a7-4ad7-9c85-d8393a31a9bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss_297da232-c1a7-4ad7-9c85-d8393a31a9bb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeAbstract_d90ee4bb-5757-47eb-887c-d446780fdcb3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoninterestIncomeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_us-gaap_NoninterestIncomeAbstract_d90ee4bb-5757-47eb-887c-d446780fdcb3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_25689100-76d0-47d8-a2d5-5280cbd8b254" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_d90ee4bb-5757-47eb-887c-d446780fdcb3" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_25689100-76d0-47d8-a2d5-5280cbd8b254" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesGainLoss_4ed76ceb-ba48-4fab-bb5a-0577ae45d423" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtAndEquitySecuritiesGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_d90ee4bb-5757-47eb-887c-d446780fdcb3" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesGainLoss_4ed76ceb-ba48-4fab-bb5a-0577ae45d423" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankOwnedLifeInsuranceIncome_d753f816-6306-4797-8e42-201d204a2689" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BankOwnedLifeInsuranceIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_d90ee4bb-5757-47eb-887c-d446780fdcb3" xlink:to="loc_us-gaap_BankOwnedLifeInsuranceIncome_d753f816-6306-4797-8e42-201d204a2689" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BankDebitAndOtherCardRevenue_414eea80-0adb-4d05-9833-909cb8ec7c5e" xlink:href="bhrb-20250630.xsd#bhrb_BankDebitAndOtherCardRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_d90ee4bb-5757-47eb-887c-d446780fdcb3" xlink:to="loc_bhrb_BankDebitAndOtherCardRevenue_414eea80-0adb-4d05-9833-909cb8ec7c5e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_04cd8f58-ca7f-4928-a5aa-7ef1619fbd3a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoninterestIncomeOtherOperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_d90ee4bb-5757-47eb-887c-d446780fdcb3" xlink:to="loc_us-gaap_NoninterestIncomeOtherOperatingIncome_04cd8f58-ca7f-4928-a5aa-7ef1619fbd3a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestIncome_11e8734a-8112-4e34-865e-085fab8ac0c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoninterestIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestIncomeAbstract_d90ee4bb-5757-47eb-887c-d446780fdcb3" xlink:to="loc_us-gaap_NoninterestIncome_11e8734a-8112-4e34-865e-085fab8ac0c3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpenseAbstract_56126391-5487-4c32-8aad-94f67b675ca3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoninterestExpenseAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_us-gaap_NoninterestExpenseAbstract_56126391-5487-4c32-8aad-94f67b675ca3" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalariesWagesAndOfficersCompensation_d96d34c2-365e-4561-beca-52adc24cddb0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SalariesWagesAndOfficersCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_56126391-5487-4c32-8aad-94f67b675ca3" xlink:to="loc_us-gaap_SalariesWagesAndOfficersCompensation_d96d34c2-365e-4561-beca-52adc24cddb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeBenefitsAndShareBasedCompensation_78786e82-088c-4c91-9a36-b9e8c509934a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeBenefitsAndShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_56126391-5487-4c32-8aad-94f67b675ca3" xlink:to="loc_us-gaap_EmployeeBenefitsAndShareBasedCompensation_78786e82-088c-4c91-9a36-b9e8c509934a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyNet_4ffb9a00-2700-4490-abf9-d9d71ebc9d11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OccupancyNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_56126391-5487-4c32-8aad-94f67b675ca3" xlink:to="loc_us-gaap_OccupancyNet_4ffb9a00-2700-4490-abf9-d9d71ebc9d11" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquipmentExpense_639c500d-fdbe-4274-91e8-3e2e4495c5d1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquipmentExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_56126391-5487-4c32-8aad-94f67b675ca3" xlink:to="loc_us-gaap_EquipmentExpense_639c500d-fdbe-4274-91e8-3e2e4495c5d1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoninterestExpense_11f2d881-c510-438e-aab7-90d88e5c30d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherNoninterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_56126391-5487-4c32-8aad-94f67b675ca3" xlink:to="loc_us-gaap_OtherNoninterestExpense_11f2d881-c510-438e-aab7-90d88e5c30d9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoninterestExpense_305e2b02-0a8b-4aba-bc87-92e5ccdbf0ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NoninterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NoninterestExpenseAbstract_56126391-5487-4c32-8aad-94f67b675ca3" xlink:to="loc_us-gaap_NoninterestExpense_305e2b02-0a8b-4aba-bc87-92e5ccdbf0ef" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_181c31ba-e817-4c8a-b469-8895328e1408" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest_181c31ba-e817-4c8a-b469-8895328e1408" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_f3684c23-009f-4614-a67f-fe582fc0074e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_f3684c23-009f-4614-a67f-fe582fc0074e" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_be3d50b5-c04e-4ea0-802f-9c2444396a8b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_us-gaap_NetIncomeLoss_be3d50b5-c04e-4ea0-802f-9c2444396a8b" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_e71e8f34-7823-430c-a320-3d3c0362423d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendsIncomeStatementImpact"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_us-gaap_PreferredStockDividendsIncomeStatementImpact_e71e8f34-7823-430c-a320-3d3c0362423d" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_eb213714-c158-4c1a-8b2a-7a219cd16d80" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_eb213714-c158-4c1a-8b2a-7a219cd16d80" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareAbstract_25fdb6cd-2ec6-43c1-aae9-89333469cd87" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_929b816d-388b-421a-9fa6-57bdf2595caa" xlink:to="loc_us-gaap_EarningsPerShareAbstract_25fdb6cd-2ec6-43c1-aae9-89333469cd87" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_da847839-0b34-4bd6-bb70-d955b89ac895" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_25fdb6cd-2ec6-43c1-aae9-89333469cd87" xlink:to="loc_us-gaap_EarningsPerShareBasic_da847839-0b34-4bd6-bb70-d955b89ac895" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_5d1dfd53-a0e9-483b-93fa-84ef328cfe4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EarningsPerShareAbstract_25fdb6cd-2ec6-43c1-aae9-89333469cd87" xlink:to="loc_us-gaap_EarningsPerShareDiluted_5d1dfd53-a0e9-483b-93fa-84ef328cfe4d" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/ConsolidatedStatementsofChangesinShareholdersEquity" xlink:type="simple" xlink:href="bhrb-20250630.xsd#ConsolidatedStatementsofChangesinShareholdersEquity"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/ConsolidatedStatementsofChangesinShareholdersEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_a48c356c-c2fb-405d-a03d-84af8aece96a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_50758db7-d343-42a8-a330-c5ed6a3ae837" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_a48c356c-c2fb-405d-a03d-84af8aece96a" xlink:to="loc_us-gaap_StatementTable_50758db7-d343-42a8-a330-c5ed6a3ae837" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_ae612b6c-df13-4114-bcec-f2e52606cc50" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_50758db7-d343-42a8-a330-c5ed6a3ae837" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_ae612b6c-df13-4114-bcec-f2e52606cc50" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_ae612b6c-df13-4114-bcec-f2e52606cc50_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ae612b6c-df13-4114-bcec-f2e52606cc50" xlink:to="loc_us-gaap_EquityComponentDomain_ae612b6c-df13-4114-bcec-f2e52606cc50_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_ac0c308c-925e-41ce-ba21-b7eac290e15c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_ae612b6c-df13-4114-bcec-f2e52606cc50" xlink:to="loc_us-gaap_EquityComponentDomain_ac0c308c-925e-41ce-ba21-b7eac290e15c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockIncludingAdditionalPaidInCapitalMember_0540dd78-82cc-457f-acca-caeb949059e4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockIncludingAdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ac0c308c-925e-41ce-ba21-b7eac290e15c" xlink:to="loc_us-gaap_PreferredStockIncludingAdditionalPaidInCapitalMember_0540dd78-82cc-457f-acca-caeb949059e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_3a2a4c45-b524-4d84-ab02-4e2dc010f8f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ac0c308c-925e-41ce-ba21-b7eac290e15c" xlink:to="loc_us-gaap_CommonStockMember_3a2a4c45-b524-4d84-ab02-4e2dc010f8f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_897fcee0-f824-43d9-a73b-dbc3a78a65cb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ac0c308c-925e-41ce-ba21-b7eac290e15c" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_897fcee0-f824-43d9-a73b-dbc3a78a65cb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_74b6e8cd-b886-4c18-93b5-7086e9cac00e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ac0c308c-925e-41ce-ba21-b7eac290e15c" xlink:to="loc_us-gaap_RetainedEarningsMember_74b6e8cd-b886-4c18-93b5-7086e9cac00e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_119f4667-79a5-451f-b044-4e9fef33ebf7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ac0c308c-925e-41ce-ba21-b7eac290e15c" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_119f4667-79a5-451f-b044-4e9fef33ebf7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_7ed6c13a-eb40-4553-a1a6-e8ec6f202aac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_ac0c308c-925e-41ce-ba21-b7eac290e15c" xlink:to="loc_us-gaap_TreasuryStockCommonMember_7ed6c13a-eb40-4553-a1a6-e8ec6f202aac" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_39f54ab6-f4eb-4e66-a1ff-8c972876f7fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_a48c356c-c2fb-405d-a03d-84af8aece96a" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_39f54ab6-f4eb-4e66-a1ff-8c972876f7fd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_91143d67-0d9e-4e6b-89ed-661a63ea8dd0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_39f54ab6-f4eb-4e66-a1ff-8c972876f7fd" xlink:to="loc_us-gaap_StockholdersEquity_91143d67-0d9e-4e6b-89ed-661a63ea8dd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_1816dff7-cefa-449e-b8f1-9c7fe7b6848d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_39f54ab6-f4eb-4e66-a1ff-8c972876f7fd" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_1816dff7-cefa-449e-b8f1-9c7fe7b6848d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_f2bfa852-aac3-417a-b6ab-8bca70940f18" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodValueAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_39f54ab6-f4eb-4e66-a1ff-8c972876f7fd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueAcquisitions_f2bfa852-aac3-417a-b6ab-8bca70940f18" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_04938fc8-d3de-43dc-a384-05257777da0e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesAcquisitions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_39f54ab6-f4eb-4e66-a1ff-8c972876f7fd" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesAcquisitions_04938fc8-d3de-43dc-a384-05257777da0e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_e3094f74-99e5-4095-bbe4-08aa84ca9d72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_39f54ab6-f4eb-4e66-a1ff-8c972876f7fd" xlink:to="loc_us-gaap_NetIncomeLoss_e3094f74-99e5-4095-bbe4-08aa84ca9d72" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_8ffee37c-60ce-4610-9b12-fea31d742a7a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_39f54ab6-f4eb-4e66-a1ff-8c972876f7fd" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_8ffee37c-60ce-4610-9b12-fea31d742a7a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_f2b8b47c-a79b-4f08-be1a-c364abe9e224" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_39f54ab6-f4eb-4e66-a1ff-8c972876f7fd" xlink:to="loc_us-gaap_DividendsCommonStockCash_f2b8b47c-a79b-4f08-be1a-c364abe9e224" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsPreferredStockCash_122c5342-dd2f-450b-baf4-a1fb188f8ac9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DividendsPreferredStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_39f54ab6-f4eb-4e66-a1ff-8c972876f7fd" xlink:to="loc_us-gaap_DividendsPreferredStockCash_122c5342-dd2f-450b-baf4-a1fb188f8ac9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SharesGrantedSharesShareBasedPaymentArrangementAfterForfeiture_adf8c18e-b556-4619-ab12-8eed3ae2dc5b" xlink:href="bhrb-20250630.xsd#bhrb_SharesGrantedSharesShareBasedPaymentArrangementAfterForfeiture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_39f54ab6-f4eb-4e66-a1ff-8c972876f7fd" xlink:to="loc_bhrb_SharesGrantedSharesShareBasedPaymentArrangementAfterForfeiture_adf8c18e-b556-4619-ab12-8eed3ae2dc5b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_b3f0096d-6326-4001-8979-613d708e7ec1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_39f54ab6-f4eb-4e66-a1ff-8c972876f7fd" xlink:to="loc_us-gaap_StockGrantedDuringPeriodValueSharebasedCompensation_b3f0096d-6326-4001-8979-613d708e7ec1" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_3b995e8a-7bd9-4b4a-87cf-2394d3141126" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_23676f12-79f9-4fda-ab48-167c3d47e35b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockSharesOutstanding"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/NatureofBusinessActivitiesandSignificantAccountingPoliciesDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#NatureofBusinessActivitiesandSignificantAccountingPoliciesDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/NatureofBusinessActivitiesandSignificantAccountingPoliciesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6003be63-225e-4152-99f3-a0e1c1441777" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_da067188-bec5-4772-adf9-839ebd5c9bc3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6003be63-225e-4152-99f3-a0e1c1441777" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_da067188-bec5-4772-adf9-839ebd5c9bc3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_a9c5af15-6f19-4644-90d6-4a29dfa52242" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_da067188-bec5-4772-adf9-839ebd5c9bc3" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_a9c5af15-6f19-4644-90d6-4a29dfa52242" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a9c5af15-6f19-4644-90d6-4a29dfa52242_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_a9c5af15-6f19-4644-90d6-4a29dfa52242" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_a9c5af15-6f19-4644-90d6-4a29dfa52242_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_43725d86-cd03-40fa-ab80-89efbd9e874d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_a9c5af15-6f19-4644-90d6-4a29dfa52242" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_43725d86-cd03-40fa-ab80-89efbd9e874d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SummitFinancialGroupIncMember_7a07bf4d-7c5e-4a46-a626-bd86c5755c38" xlink:href="bhrb-20250630.xsd#bhrb_SummitFinancialGroupIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_43725d86-cd03-40fa-ab80-89efbd9e874d" xlink:to="loc_bhrb_SummitFinancialGroupIncMember_7a07bf4d-7c5e-4a46-a626-bd86c5755c38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_NumberOfBranchesAndLoanOffices_8f79c695-8ed8-4e6f-80af-f844ff981826" xlink:href="bhrb-20250630.xsd#bhrb_NumberOfBranchesAndLoanOffices"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6003be63-225e-4152-99f3-a0e1c1441777" xlink:to="loc_bhrb_NumberOfBranchesAndLoanOffices_8f79c695-8ed8-4e6f-80af-f844ff981826" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationConsiderationTransferredExchangeRatio_9bf7a4ff-d1ac-41f7-8e03-2b5071bfc0d7" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationConsiderationTransferredExchangeRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6003be63-225e-4152-99f3-a0e1c1441777" xlink:to="loc_bhrb_BusinessCombinationConsiderationTransferredExchangeRatio_9bf7a4ff-d1ac-41f7-8e03-2b5071bfc0d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_92929af2-06c6-45af-b802-e81c082a76be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6003be63-225e-4152-99f3-a0e1c1441777" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_92929af2-06c6-45af-b802-e81c082a76be" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_97b09fc2-bb71-4bbb-84e6-ad43e44870e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6003be63-225e-4152-99f3-a0e1c1441777" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_97b09fc2-bb71-4bbb-84e6-ad43e44870e2" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/SecuritiesScheduleofDebtSecuritiesAvailableforSaleDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#SecuritiesScheduleofDebtSecuritiesAvailableforSaleDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/SecuritiesScheduleofDebtSecuritiesAvailableforSaleDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_ae1aa520-89de-4aab-b803-18726f921493" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_6d1ee412-5757-493c-8abd-5a87e13775aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_ae1aa520-89de-4aab-b803-18726f921493" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_6d1ee412-5757-493c-8abd-5a87e13775aa" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_d532f954-45bc-4849-9ecb-114f1e239904" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_6d1ee412-5757-493c-8abd-5a87e13775aa" xlink:to="loc_us-gaap_FinancialInstrumentAxis_d532f954-45bc-4849-9ecb-114f1e239904" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_d532f954-45bc-4849-9ecb-114f1e239904_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_d532f954-45bc-4849-9ecb-114f1e239904" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_d532f954-45bc-4849-9ecb-114f1e239904_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_77e92a44-a1ab-47ba-8aba-482935ef8216" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_d532f954-45bc-4849-9ecb-114f1e239904" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_77e92a44-a1ab-47ba-8aba-482935ef8216" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_5ae723f1-485c-402a-a815-47cc99afdee2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_77e92a44-a1ab-47ba-8aba-482935ef8216" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_5ae723f1-485c-402a-a815-47cc99afdee2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_97eb44d8-2505-433a-b668-5b47602789c6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_77e92a44-a1ab-47ba-8aba-482935ef8216" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_97eb44d8-2505-433a-b668-5b47602789c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ResidentialMortgageBackedSecuritiesAgencyMember_92a201b3-5276-415d-aa1e-e6f0c073bd2c" xlink:href="bhrb-20250630.xsd#bhrb_ResidentialMortgageBackedSecuritiesAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_77e92a44-a1ab-47ba-8aba-482935ef8216" xlink:to="loc_bhrb_ResidentialMortgageBackedSecuritiesAgencyMember_92a201b3-5276-415d-aa1e-e6f0c073bd2c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember_fd7de59f-89a1-46c6-b395-a115b8b685b1" xlink:href="bhrb-20250630.xsd#bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_77e92a44-a1ab-47ba-8aba-482935ef8216" xlink:to="loc_bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember_fd7de59f-89a1-46c6-b395-a115b8b685b1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_CommercialMortgageBackedSecuritiesAgencyMember_9346a895-f8bd-4ed8-af6c-6803a8239b9b" xlink:href="bhrb-20250630.xsd#bhrb_CommercialMortgageBackedSecuritiesAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_77e92a44-a1ab-47ba-8aba-482935ef8216" xlink:to="loc_bhrb_CommercialMortgageBackedSecuritiesAgencyMember_9346a895-f8bd-4ed8-af6c-6803a8239b9b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember_9492ec4d-707a-41bd-bdaa-f3c070e1b53f" xlink:href="bhrb-20250630.xsd#bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_77e92a44-a1ab-47ba-8aba-482935ef8216" xlink:to="loc_bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember_9492ec4d-707a-41bd-bdaa-f3c070e1b53f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_05e9714d-d23b-4ff0-9e57-ede501a4daf0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_77e92a44-a1ab-47ba-8aba-482935ef8216" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_05e9714d-d23b-4ff0-9e57-ede501a4daf0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_abb246fd-1d9d-4e07-ac9c-b4ac9d614e31" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_77e92a44-a1ab-47ba-8aba-482935ef8216" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_abb246fd-1d9d-4e07-ac9c-b4ac9d614e31" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_6efc2620-ac9c-416f-9942-27f062dfbfe0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_ae1aa520-89de-4aab-b803-18726f921493" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_6efc2620-ac9c-416f-9942-27f062dfbfe0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_395b0cab-ef0d-4622-baa6-6dabb8e8dab9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_ae1aa520-89de-4aab-b803-18726f921493" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax_395b0cab-ef0d-4622-baa6-6dabb8e8dab9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_56f4025b-8eb9-43b6-bda4-06de8e20a266" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_ae1aa520-89de-4aab-b803-18726f921493" xlink:to="loc_us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax_56f4025b-8eb9-43b6-bda4-06de8e20a266" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_ba9dc75f-85bf-408c-9310-0b62c75733b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_ae1aa520-89de-4aab-b803-18726f921493" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_ba9dc75f-85bf-408c-9310-0b62c75733b2" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/SecuritiesNarrativeDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#SecuritiesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/SecuritiesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_278ec779-adbe-4698-a160-3acec66c7937" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_e7830b30-1c8a-44f6-a851-18904a0a9edc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_278ec779-adbe-4698-a160-3acec66c7937" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_e7830b30-1c8a-44f6-a851-18904a0a9edc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_19961721-c161-4725-92b3-3c1c285a2fb8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_e7830b30-1c8a-44f6-a851-18904a0a9edc" xlink:to="loc_us-gaap_FinancialInstrumentAxis_19961721-c161-4725-92b3-3c1c285a2fb8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_19961721-c161-4725-92b3-3c1c285a2fb8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_19961721-c161-4725-92b3-3c1c285a2fb8" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_19961721-c161-4725-92b3-3c1c285a2fb8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f1b0917e-2244-4ea0-9bb3-578091b85e9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_19961721-c161-4725-92b3-3c1c285a2fb8" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f1b0917e-2244-4ea0-9bb3-578091b85e9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_26491b64-b3a1-4893-91e8-0bd6a25ed8bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f1b0917e-2244-4ea0-9bb3-578091b85e9f" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_26491b64-b3a1-4893-91e8-0bd6a25ed8bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ResidentialMortgageBackedSecuritiesAgencyMember_7a06fc9c-8500-40cd-937b-93ad90c39407" xlink:href="bhrb-20250630.xsd#bhrb_ResidentialMortgageBackedSecuritiesAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f1b0917e-2244-4ea0-9bb3-578091b85e9f" xlink:to="loc_bhrb_ResidentialMortgageBackedSecuritiesAgencyMember_7a06fc9c-8500-40cd-937b-93ad90c39407" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_95789df5-a931-4642-9d4e-c72b1d0d00a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialMortgageBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f1b0917e-2244-4ea0-9bb3-578091b85e9f" xlink:to="loc_us-gaap_CommercialMortgageBackedSecuritiesMember_95789df5-a931-4642-9d4e-c72b1d0d00a2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_StateAndMunicipalSecuritiesMember_f0dbbfc6-14c9-459b-ac0d-7a8991798167" xlink:href="bhrb-20250630.xsd#bhrb_StateAndMunicipalSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f1b0917e-2244-4ea0-9bb3-578091b85e9f" xlink:to="loc_bhrb_StateAndMunicipalSecuritiesMember_f0dbbfc6-14c9-459b-ac0d-7a8991798167" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember_cb095e32-652f-47fb-a18e-401e06ae527b" xlink:href="bhrb-20250630.xsd#bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f1b0917e-2244-4ea0-9bb3-578091b85e9f" xlink:to="loc_bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember_cb095e32-652f-47fb-a18e-401e06ae527b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember_9c3aab34-32b3-4297-98c1-c4c1b2e65f48" xlink:href="bhrb-20250630.xsd#bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f1b0917e-2244-4ea0-9bb3-578091b85e9f" xlink:to="loc_bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember_9c3aab34-32b3-4297-98c1-c4c1b2e65f48" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_2768d239-6cab-46a0-bddc-afb5c5f20b0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f1b0917e-2244-4ea0-9bb3-578091b85e9f" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_2768d239-6cab-46a0-bddc-afb5c5f20b0b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_c863e637-4016-4f32-b205-c905aef65cf8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_f1b0917e-2244-4ea0-9bb3-578091b85e9f" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_c863e637-4016-4f32-b205-c905aef65cf8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_5b85502d-7302-42aa-84a3-df594910abfa" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_e7830b30-1c8a-44f6-a851-18904a0a9edc" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_5b85502d-7302-42aa-84a3-df594910abfa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_5b85502d-7302-42aa-84a3-df594910abfa_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_5b85502d-7302-42aa-84a3-df594910abfa" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_5b85502d-7302-42aa-84a3-df594910abfa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_ae440989-1bb5-4450-a1b3-b3dcff47ce88" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_5b85502d-7302-42aa-84a3-df594910abfa" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_ae440989-1bb5-4450-a1b3-b3dcff47ce88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_CommunityBankersBankMember_649d12f6-bd94-44e1-8b04-ab2e1ccf7ea2" xlink:href="bhrb-20250630.xsd#bhrb_CommunityBankersBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_ae440989-1bb5-4450-a1b3-b3dcff47ce88" xlink:to="loc_bhrb_CommunityBankersBankMember_649d12f6-bd94-44e1-8b04-ab2e1ccf7ea2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusAxis_9763b783-6187-4559-8e24-8e6e4d59c721" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_e7830b30-1c8a-44f6-a851-18904a0a9edc" xlink:to="loc_us-gaap_PledgedStatusAxis_9763b783-6187-4559-8e24-8e6e4d59c721" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_9763b783-6187-4559-8e24-8e6e4d59c721_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PledgedStatusAxis_9763b783-6187-4559-8e24-8e6e4d59c721" xlink:to="loc_us-gaap_PledgedStatusDomain_9763b783-6187-4559-8e24-8e6e4d59c721_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PledgedStatusDomain_2a2f679c-a58a-4555-9b24-b1da50a52e4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PledgedStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PledgedStatusAxis_9763b783-6187-4559-8e24-8e6e4d59c721" xlink:to="loc_us-gaap_PledgedStatusDomain_2a2f679c-a58a-4555-9b24-b1da50a52e4f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetPledgedAsCollateralMember_6795ca14-c0ac-425e-a643-e1479b9e37e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetPledgedAsCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PledgedStatusDomain_2a2f679c-a58a-4555-9b24-b1da50a52e4f" xlink:to="loc_us-gaap_AssetPledgedAsCollateralMember_6795ca14-c0ac-425e-a643-e1479b9e37e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_8fbc042f-e118-4897-9eac-34eac8e86632" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_278ec779-adbe-4698-a160-3acec66c7937" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_8fbc042f-e118-4897-9eac-34eac8e86632" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_2a407cd8-2dea-46dd-957d-9f2214abfcd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_278ec779-adbe-4698-a160-3acec66c7937" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_2a407cd8-2dea-46dd-957d-9f2214abfcd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RealizedAndUnrealizedGainLossInvestmentAndDerivativeOperatingTaxExpenseBenefit_39d2be38-f266-4fec-842e-d6dd36949e07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealizedAndUnrealizedGainLossInvestmentAndDerivativeOperatingTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_278ec779-adbe-4698-a160-3acec66c7937" xlink:to="loc_us-gaap_RealizedAndUnrealizedGainLossInvestmentAndDerivativeOperatingTaxExpenseBenefit_39d2be38-f266-4fec-842e-d6dd36949e07" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_26e43783-1af3-4cd9-b2ae-a193c00c2303" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_278ec779-adbe-4698-a160-3acec66c7937" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostAllowanceForCreditLossExcludingAccruedInterest_26e43783-1af3-4cd9-b2ae-a193c00c2303" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SecuritiesUnrealizedLoss_236db3cb-cab6-4693-8774-c3df6e855588" xlink:href="bhrb-20250630.xsd#bhrb_SecuritiesUnrealizedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_278ec779-adbe-4698-a160-3acec66c7937" xlink:to="loc_bhrb_SecuritiesUnrealizedLoss_236db3cb-cab6-4693-8774-c3df6e855588" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal_a5b820d8-ea52-450f-bcee-a30553360c15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_278ec779-adbe-4698-a160-3acec66c7937" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterestAllowanceForCreditLossNotToSellBeforeRecoveryCreditLossPreviouslyRecordedExpenseReversal_a5b820d8-ea52-450f-bcee-a30553360c15" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_f4d9be0d-4541-420c-b390-d21e14cf977b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_278ec779-adbe-4698-a160-3acec66c7937" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions_f4d9be0d-4541-420c-b390-d21e14cf977b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalHomeLoanBankStock_c8858fca-89f4-44c3-b7d1-5df3cbeef51d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FederalHomeLoanBankStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_278ec779-adbe-4698-a160-3acec66c7937" xlink:to="loc_us-gaap_FederalHomeLoanBankStock_c8858fca-89f4-44c3-b7d1-5df3cbeef51d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FederalReserveBankStock_29d1e0ff-b7c8-49f2-9f99-53d8f61b1206" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FederalReserveBankStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_278ec779-adbe-4698-a160-3acec66c7937" xlink:to="loc_us-gaap_FederalReserveBankStock_29d1e0ff-b7c8-49f2-9f99-53d8f61b1206" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedInvestments_3b8ee22e-43fd-490a-9cee-94317e8d1eac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_278ec779-adbe-4698-a160-3acec66c7937" xlink:to="loc_us-gaap_RestrictedInvestments_3b8ee22e-43fd-490a-9cee-94317e8d1eac" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/SecuritiesScheduleofExpectedMaturityforDebtSecuritiesAvailableforSaleDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#SecuritiesScheduleofExpectedMaturityforDebtSecuritiesAvailableforSaleDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/SecuritiesScheduleofExpectedMaturityforDebtSecuritiesAvailableforSaleDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_029468d2-90a1-4f71-a45a-54e7bd6e8492" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_b8128c27-262a-499b-b518-d6b64dfa3fcd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_029468d2-90a1-4f71-a45a-54e7bd6e8492" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_b8128c27-262a-499b-b518-d6b64dfa3fcd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_c29c7735-5936-4a0d-a392-3d7daaff4576" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_b8128c27-262a-499b-b518-d6b64dfa3fcd" xlink:to="loc_us-gaap_FinancialInstrumentAxis_c29c7735-5936-4a0d-a392-3d7daaff4576" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_c29c7735-5936-4a0d-a392-3d7daaff4576_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_c29c7735-5936-4a0d-a392-3d7daaff4576" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_c29c7735-5936-4a0d-a392-3d7daaff4576_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_87de62b8-2606-47b9-94ab-4cdda6936b46" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_c29c7735-5936-4a0d-a392-3d7daaff4576" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_87de62b8-2606-47b9-94ab-4cdda6936b46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_a0114509-e6bd-4b31-af2c-13a8e0a9b681" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_87de62b8-2606-47b9-94ab-4cdda6936b46" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_a0114509-e6bd-4b31-af2c-13a8e0a9b681" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_a664c30f-3de5-4035-996e-3646b18ea7b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_87de62b8-2606-47b9-94ab-4cdda6936b46" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_a664c30f-3de5-4035-996e-3646b18ea7b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ResidentialMortgageBackedSecuritiesAgencyMember_faddd85e-b8eb-49d9-b09c-32e32aa2d4b7" xlink:href="bhrb-20250630.xsd#bhrb_ResidentialMortgageBackedSecuritiesAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_87de62b8-2606-47b9-94ab-4cdda6936b46" xlink:to="loc_bhrb_ResidentialMortgageBackedSecuritiesAgencyMember_faddd85e-b8eb-49d9-b09c-32e32aa2d4b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember_9c6ad51a-5c82-424e-ad4b-3153125ff052" xlink:href="bhrb-20250630.xsd#bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_87de62b8-2606-47b9-94ab-4cdda6936b46" xlink:to="loc_bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember_9c6ad51a-5c82-424e-ad4b-3153125ff052" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_CommercialMortgageBackedSecuritiesAgencyMember_be060ce2-3654-47bd-a343-9abc11fb96a1" xlink:href="bhrb-20250630.xsd#bhrb_CommercialMortgageBackedSecuritiesAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_87de62b8-2606-47b9-94ab-4cdda6936b46" xlink:to="loc_bhrb_CommercialMortgageBackedSecuritiesAgencyMember_be060ce2-3654-47bd-a343-9abc11fb96a1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember_7da86b90-1faf-4706-a337-502b9e183537" xlink:href="bhrb-20250630.xsd#bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_87de62b8-2606-47b9-94ab-4cdda6936b46" xlink:to="loc_bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember_7da86b90-1faf-4706-a337-502b9e183537" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_089d9c6d-ecd7-4e96-a16a-0dd9107d7335" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_87de62b8-2606-47b9-94ab-4cdda6936b46" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_089d9c6d-ecd7-4e96-a16a-0dd9107d7335" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_18ef96ff-d3dc-4d01-b947-36635dbefc1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_87de62b8-2606-47b9-94ab-4cdda6936b46" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_18ef96ff-d3dc-4d01-b947-36635dbefc1e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_abad697e-8e1b-4781-a0f0-7fc336cb08aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_029468d2-90a1-4f71-a45a-54e7bd6e8492" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_abad697e-8e1b-4781-a0f0-7fc336cb08aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_8d7d2a48-aa2a-47de-bbfe-3a89f47ca231" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_abad697e-8e1b-4781-a0f0-7fc336cb08aa" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearAmortizedCost_8d7d2a48-aa2a-47de-bbfe-3a89f47ca231" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_cc5be882-e998-4d70-b3ef-8155678ebe9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_abad697e-8e1b-4781-a0f0-7fc336cb08aa" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsAmortizedCost_cc5be882-e998-4d70-b3ef-8155678ebe9c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_8043d219-6ebf-402d-a86c-76ad19b6fe1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_abad697e-8e1b-4781-a0f0-7fc336cb08aa" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsAmortizedCost_8043d219-6ebf-402d-a86c-76ad19b6fe1a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_bf492e15-4a3e-43b9-a2c3-fbb7cfb6e294" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_abad697e-8e1b-4781-a0f0-7fc336cb08aa" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsAmortizedCost_bf492e15-4a3e-43b9-a2c3-fbb7cfb6e294" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_00859af1-2d52-453b-84d2-c6b9b43aecea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAmortizedCostAbstract_abad697e-8e1b-4781-a0f0-7fc336cb08aa" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostExcludingAccruedInterestAfterAllowanceForCreditLoss_00859af1-2d52-453b-84d2-c6b9b43aecea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_361eeda2-0849-4cc5-ac5a-aff4d4d4e0a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_029468d2-90a1-4f71-a45a-54e7bd6e8492" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_361eeda2-0849-4cc5-ac5a-aff4d4d4e0a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_0ad9fb9e-0615-4e4e-b198-fa91088b84f0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_361eeda2-0849-4cc5-ac5a-aff4d4d4e0a0" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue_0ad9fb9e-0615-4e4e-b198-fa91088b84f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_ab3e759e-cf9f-46d4-bd1c-d5729948b0dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_361eeda2-0849-4cc5-ac5a-aff4d4d4e0a0" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue_ab3e759e-cf9f-46d4-bd1c-d5729948b0dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_53b13ad1-1ded-4da7-8620-4ef068af0f25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_361eeda2-0849-4cc5-ac5a-aff4d4d4e0a0" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue_53b13ad1-1ded-4da7-8620-4ef068af0f25" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_a15907d4-7fe4-40ee-b36a-dbbd5e3ab5a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_361eeda2-0849-4cc5-ac5a-aff4d4d4e0a0" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue_a15907d4-7fe4-40ee-b36a-dbbd5e3ab5a0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_8f771ca3-fbd6-428b-9b8e-b64b501b7785" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesDebtMaturitiesFairValueAbstract_361eeda2-0849-4cc5-ac5a-aff4d4d4e0a0" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_8f771ca3-fbd6-428b-9b8e-b64b501b7785" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/SecuritiesScheduleofDebtSecuritiesAvailableforSaleUnrealizedLossPositionFairValueDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#SecuritiesScheduleofDebtSecuritiesAvailableforSaleUnrealizedLossPositionFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/SecuritiesScheduleofDebtSecuritiesAvailableforSaleUnrealizedLossPositionFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_80b170ef-0d87-48cc-821e-316caf6b96f7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_b4aef12f-84c1-466f-94f6-2b37ccae0743" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_80b170ef-0d87-48cc-821e-316caf6b96f7" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_b4aef12f-84c1-466f-94f6-2b37ccae0743" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_5cee668c-d6f7-4f87-afe5-bba7ed5b240e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationTable_b4aef12f-84c1-466f-94f6-2b37ccae0743" xlink:to="loc_us-gaap_FinancialInstrumentAxis_5cee668c-d6f7-4f87-afe5-bba7ed5b240e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_5cee668c-d6f7-4f87-afe5-bba7ed5b240e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_5cee668c-d6f7-4f87-afe5-bba7ed5b240e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_5cee668c-d6f7-4f87-afe5-bba7ed5b240e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1c13ea22-f4b6-4c0f-95f8-491840c57a9a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_5cee668c-d6f7-4f87-afe5-bba7ed5b240e" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1c13ea22-f4b6-4c0f-95f8-491840c57a9a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_11a46c90-7376-4dbd-a060-9aa800ca2b08" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1c13ea22-f4b6-4c0f-95f8-491840c57a9a" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_11a46c90-7376-4dbd-a060-9aa800ca2b08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_282efdb1-31cd-4b6e-a830-1143e976607c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1c13ea22-f4b6-4c0f-95f8-491840c57a9a" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_282efdb1-31cd-4b6e-a830-1143e976607c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ResidentialMortgageBackedSecuritiesAgencyMember_3b1ba5c4-a904-47ce-8511-9d873f0584b3" xlink:href="bhrb-20250630.xsd#bhrb_ResidentialMortgageBackedSecuritiesAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1c13ea22-f4b6-4c0f-95f8-491840c57a9a" xlink:to="loc_bhrb_ResidentialMortgageBackedSecuritiesAgencyMember_3b1ba5c4-a904-47ce-8511-9d873f0584b3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember_987150c3-2aa5-4cda-a278-1047e55847bb" xlink:href="bhrb-20250630.xsd#bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1c13ea22-f4b6-4c0f-95f8-491840c57a9a" xlink:to="loc_bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember_987150c3-2aa5-4cda-a278-1047e55847bb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_CommercialMortgageBackedSecuritiesAgencyMember_0f1ed87b-0ec2-4772-bb9f-e2e36df569d0" xlink:href="bhrb-20250630.xsd#bhrb_CommercialMortgageBackedSecuritiesAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1c13ea22-f4b6-4c0f-95f8-491840c57a9a" xlink:to="loc_bhrb_CommercialMortgageBackedSecuritiesAgencyMember_0f1ed87b-0ec2-4772-bb9f-e2e36df569d0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember_2be745e9-6464-4da0-b83a-261a334db1cf" xlink:href="bhrb-20250630.xsd#bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1c13ea22-f4b6-4c0f-95f8-491840c57a9a" xlink:to="loc_bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember_2be745e9-6464-4da0-b83a-261a334db1cf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_19e21b8b-5f23-4e7e-b9be-21e86df1e1fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1c13ea22-f4b6-4c0f-95f8-491840c57a9a" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_19e21b8b-5f23-4e7e-b9be-21e86df1e1fc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_427755b9-c19b-4c47-8778-a65d010500ab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_1c13ea22-f4b6-4c0f-95f8-491840c57a9a" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_427755b9-c19b-4c47-8778-a65d010500ab" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_ff862cee-4e4b-4dc7-89ad-0975ba374727" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_80b170ef-0d87-48cc-821e-316caf6b96f7" xlink:to="loc_us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_ff862cee-4e4b-4dc7-89ad-0975ba374727" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_07567663-4c5f-4b59-8a0f-bdfaac2759ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_ff862cee-4e4b-4dc7-89ad-0975ba374727" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months_07567663-4c5f-4b59-8a0f-bdfaac2759ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_e638ac38-f2ad-4654-b66b-f4e83faa57c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtSecuritiesAvailableforSaleUnrealizedLossPositionAbstract_ff862cee-4e4b-4dc7-89ad-0975ba374727" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger_e638ac38-f2ad-4654-b66b-f4e83faa57c2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_79e44144-9c0d-46d1-a1db-587073a25973" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_80b170ef-0d87-48cc-821e-316caf6b96f7" xlink:to="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_79e44144-9c0d-46d1-a1db-587073a25973" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_91c68f50-efa7-4f72-954e-972d0d7bd3d4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_79e44144-9c0d-46d1-a1db-587073a25973" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss_91c68f50-efa7-4f72-954e-972d0d7bd3d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_6587d5d0-f787-4109-93a3-9f8682a4c5d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract_79e44144-9c0d-46d1-a1db-587073a25973" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss_6587d5d0-f787-4109-93a3-9f8682a4c5d9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_59de5ee3-1297-4444-a49f-e693cf58b4e2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems_80b170ef-0d87-48cc-821e-316caf6b96f7" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionAccumulatedLoss_59de5ee3-1297-4444-a49f-e693cf58b4e2" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/LoansScheduleofAccountsNotesLoansandFinancingReceivableDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#LoansScheduleofAccountsNotesLoansandFinancingReceivableDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/LoansScheduleofAccountsNotesLoansandFinancingReceivableDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_61e70426-fe55-4d12-9b7d-ab86b946c59c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_909a5de8-e6c9-410c-ac47-10f78b0f3fa7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_61e70426-fe55-4d12-9b7d-ab86b946c59c" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_909a5de8-e6c9-410c-ac47-10f78b0f3fa7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_675c8722-5c65-40b3-af30-4865711678ca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_909a5de8-e6c9-410c-ac47-10f78b0f3fa7" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_675c8722-5c65-40b3-af30-4865711678ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_675c8722-5c65-40b3-af30-4865711678ca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_675c8722-5c65-40b3-af30-4865711678ca" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_675c8722-5c65-40b3-af30-4865711678ca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_2b57b7e8-e79c-43c7-9a7e-1afa1536b563" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_675c8722-5c65-40b3-af30-4865711678ca" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_2b57b7e8-e79c-43c7-9a7e-1afa1536b563" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_36fea7eb-0c6e-4484-ac0f-7bc2a615f81a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialRealEstatePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_2b57b7e8-e79c-43c7-9a7e-1afa1536b563" xlink:to="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_36fea7eb-0c6e-4484-ac0f-7bc2a615f81a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_OwnerOccupiedCommercialRealEstateMember_f4055fd6-9fa3-49cf-b845-a39902eb4df7" xlink:href="bhrb-20250630.xsd#bhrb_OwnerOccupiedCommercialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_2b57b7e8-e79c-43c7-9a7e-1afa1536b563" xlink:to="loc_bhrb_OwnerOccupiedCommercialRealEstateMember_f4055fd6-9fa3-49cf-b845-a39902eb4df7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_AcquisitionConstructionAndDevelopmentMember_fde5aec5-3721-40f4-8c46-4d1bc79691d2" xlink:href="bhrb-20250630.xsd#bhrb_AcquisitionConstructionAndDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_2b57b7e8-e79c-43c7-9a7e-1afa1536b563" xlink:to="loc_bhrb_AcquisitionConstructionAndDevelopmentMember_fde5aec5-3721-40f4-8c46-4d1bc79691d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_3719e6e8-a5ea-497b-9238-2ae647fc9adb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_2b57b7e8-e79c-43c7-9a7e-1afa1536b563" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_3719e6e8-a5ea-497b-9238-2ae647fc9adb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_OneToFourFamilyResidentialLoansMember_ad71b788-1b00-4e8a-b562-c58811f71607" xlink:href="bhrb-20250630.xsd#bhrb_OneToFourFamilyResidentialLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_2b57b7e8-e79c-43c7-9a7e-1afa1536b563" xlink:to="loc_bhrb_OneToFourFamilyResidentialLoansMember_ad71b788-1b00-4e8a-b562-c58811f71607" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ConsumerNonRealEstateAndOtherMember_163f1944-5f73-4c44-a191-9eb40c7d5d2f" xlink:href="bhrb-20250630.xsd#bhrb_ConsumerNonRealEstateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_2b57b7e8-e79c-43c7-9a7e-1afa1536b563" xlink:to="loc_bhrb_ConsumerNonRealEstateAndOtherMember_163f1944-5f73-4c44-a191-9eb40c7d5d2f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_cd36115a-7d33-4579-9eb4-9e688f7d9c1c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_61e70426-fe55-4d12-9b7d-ab86b946c59c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_cd36115a-7d33-4579-9eb4-9e688f7d9c1c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_114b8854-614d-4d11-b31b-4c31874990da" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_61e70426-fe55-4d12-9b7d-ab86b946c59c" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_114b8854-614d-4d11-b31b-4c31874990da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_1dddeb5b-5303-4343-af12-e10e415d1bc4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_61e70426-fe55-4d12-9b7d-ab86b946c59c" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_1dddeb5b-5303-4343-af12-e10e415d1bc4" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesScheduleofActivityintheAllowanceforLoanCreditLossesDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#AllowanceforCreditLossesScheduleofActivityintheAllowanceforLoanCreditLossesDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesScheduleofActivityintheAllowanceforLoanCreditLossesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_093c3455-a57b-4a6b-91a1-43eae34466f2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_4e8875f4-52a3-4b7a-a33a-ff5eb72d0529" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_093c3455-a57b-4a6b-91a1-43eae34466f2" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_4e8875f4-52a3-4b7a-a33a-ff5eb72d0529" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_9797cf32-cad9-4bf5-a891-96d5e453485a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_4e8875f4-52a3-4b7a-a33a-ff5eb72d0529" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_9797cf32-cad9-4bf5-a891-96d5e453485a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9797cf32-cad9-4bf5-a891-96d5e453485a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_9797cf32-cad9-4bf5-a891-96d5e453485a" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9797cf32-cad9-4bf5-a891-96d5e453485a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9e99540c-6656-4389-825e-4035e38e7ffa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_9797cf32-cad9-4bf5-a891-96d5e453485a" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9e99540c-6656-4389-825e-4035e38e7ffa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_ce29a9cd-e29a-44a5-b3a1-3beb0eee2894" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialRealEstatePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9e99540c-6656-4389-825e-4035e38e7ffa" xlink:to="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_ce29a9cd-e29a-44a5-b3a1-3beb0eee2894" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_OwnerOccupiedCommercialRealEstateMember_c3877b20-528a-493e-91f8-3d5e1426efcd" xlink:href="bhrb-20250630.xsd#bhrb_OwnerOccupiedCommercialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9e99540c-6656-4389-825e-4035e38e7ffa" xlink:to="loc_bhrb_OwnerOccupiedCommercialRealEstateMember_c3877b20-528a-493e-91f8-3d5e1426efcd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_AcquisitionConstructionAndDevelopmentMember_ed65e32e-434b-4874-a1c0-721d088246d1" xlink:href="bhrb-20250630.xsd#bhrb_AcquisitionConstructionAndDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9e99540c-6656-4389-825e-4035e38e7ffa" xlink:to="loc_bhrb_AcquisitionConstructionAndDevelopmentMember_ed65e32e-434b-4874-a1c0-721d088246d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_e8c60969-2927-4361-a591-67f62be9df6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9e99540c-6656-4389-825e-4035e38e7ffa" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_e8c60969-2927-4361-a591-67f62be9df6c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_OneToFourFamilyResidentialLoansMember_841c4bed-5d72-40f5-bab3-4adf7db46eff" xlink:href="bhrb-20250630.xsd#bhrb_OneToFourFamilyResidentialLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9e99540c-6656-4389-825e-4035e38e7ffa" xlink:to="loc_bhrb_OneToFourFamilyResidentialLoansMember_841c4bed-5d72-40f5-bab3-4adf7db46eff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ConsumerNonRealEstateAndOtherMember_e8943226-c288-4fa7-b729-38542550f33e" xlink:href="bhrb-20250630.xsd#bhrb_ConsumerNonRealEstateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_9e99540c-6656-4389-825e-4035e38e7ffa" xlink:to="loc_bhrb_ConsumerNonRealEstateAndOtherMember_e8943226-c288-4fa7-b729-38542550f33e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward_5d782c8c-9618-49ee-8928-da97b806a815" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_093c3455-a57b-4a6b-91a1-43eae34466f2" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward_5d782c8c-9618-49ee-8928-da97b806a815" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_c3fcb9d9-0668-4ef9-9e34-8a99086da23c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward_5d782c8c-9618-49ee-8928-da97b806a815" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_c3fcb9d9-0668-4ef9-9e34-8a99086da23c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossLoanPurchased_43be33fc-1ecb-4daf-8487-812bf725fc25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossLoanPurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward_5d782c8c-9618-49ee-8928-da97b806a815" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossLoanPurchased_43be33fc-1ecb-4daf-8487-812bf725fc25" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForLoanLossesExpensed_175dde38-a04b-4c1b-bf8c-df282656e7e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProvisionForLoanLossesExpensed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward_5d782c8c-9618-49ee-8928-da97b806a815" xlink:to="loc_us-gaap_ProvisionForLoanLossesExpensed_175dde38-a04b-4c1b-bf8c-df282656e7e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_4f1f689a-585b-4cee-ab0f-5d086bf285ba" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward_5d782c8c-9618-49ee-8928-da97b806a815" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_4f1f689a-585b-4cee-ab0f-5d086bf285ba" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery_94da405b-ffa9-4669-884f-5755b7752d83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRollForward_5d782c8c-9618-49ee-8928-da97b806a815" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossRecovery_94da405b-ffa9-4669-884f-5755b7752d83" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest_acfed340-e265-4110-84ef-740bda11a80a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossExcludingAccruedInterest"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesScheduleofAgingandNonAccrualLoansDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#AllowanceforCreditLossesScheduleofAgingandNonAccrualLoansDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesScheduleofAgingandNonAccrualLoansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_5f39299e-f80c-4bdf-9a58-65ce3380bc12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_d3cd4166-9f95-4d92-a133-fe8c41ba2249" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_5f39299e-f80c-4bdf-9a58-65ce3380bc12" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_d3cd4166-9f95-4d92-a133-fe8c41ba2249" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_5221ec44-118e-46dc-95cb-ae747ec4368e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_d3cd4166-9f95-4d92-a133-fe8c41ba2249" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_5221ec44-118e-46dc-95cb-ae747ec4368e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_5221ec44-118e-46dc-95cb-ae747ec4368e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_5221ec44-118e-46dc-95cb-ae747ec4368e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_5221ec44-118e-46dc-95cb-ae747ec4368e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_df7c2ae8-8c11-4cf6-873c-7fb4927686e9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_5221ec44-118e-46dc-95cb-ae747ec4368e" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_df7c2ae8-8c11-4cf6-873c-7fb4927686e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_2768da00-c742-465a-8ed3-fb475f43f585" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialRealEstatePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_df7c2ae8-8c11-4cf6-873c-7fb4927686e9" xlink:to="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_2768da00-c742-465a-8ed3-fb475f43f585" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_OwnerOccupiedCommercialRealEstateMember_8ab6e4c2-05c3-4620-9db4-9894f75cee75" xlink:href="bhrb-20250630.xsd#bhrb_OwnerOccupiedCommercialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_df7c2ae8-8c11-4cf6-873c-7fb4927686e9" xlink:to="loc_bhrb_OwnerOccupiedCommercialRealEstateMember_8ab6e4c2-05c3-4620-9db4-9894f75cee75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_AcquisitionConstructionAndDevelopmentMember_0522c23b-0478-41aa-ad41-329d2c528e77" xlink:href="bhrb-20250630.xsd#bhrb_AcquisitionConstructionAndDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_df7c2ae8-8c11-4cf6-873c-7fb4927686e9" xlink:to="loc_bhrb_AcquisitionConstructionAndDevelopmentMember_0522c23b-0478-41aa-ad41-329d2c528e77" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_b18a18ba-df45-4ec4-9c5b-071d511bef13" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_df7c2ae8-8c11-4cf6-873c-7fb4927686e9" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_b18a18ba-df45-4ec4-9c5b-071d511bef13" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_OneToFourFamilyResidentialLoansMember_fb2f2ca1-780d-435c-9785-20a0843d6d47" xlink:href="bhrb-20250630.xsd#bhrb_OneToFourFamilyResidentialLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_df7c2ae8-8c11-4cf6-873c-7fb4927686e9" xlink:to="loc_bhrb_OneToFourFamilyResidentialLoansMember_fb2f2ca1-780d-435c-9785-20a0843d6d47" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ConsumerNonRealEstateAndOtherMember_f95edda1-a1ee-4c75-8b95-f58b6343aff7" xlink:href="bhrb-20250630.xsd#bhrb_ConsumerNonRealEstateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_df7c2ae8-8c11-4cf6-873c-7fb4927686e9" xlink:to="loc_bhrb_ConsumerNonRealEstateAndOtherMember_f95edda1-a1ee-4c75-8b95-f58b6343aff7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_6ed74648-d2d3-460f-aec1-45e2a3294743" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_d3cd4166-9f95-4d92-a133-fe8c41ba2249" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_6ed74648-d2d3-460f-aec1-45e2a3294743" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_6ed74648-d2d3-460f-aec1-45e2a3294743_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_6ed74648-d2d3-460f-aec1-45e2a3294743" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_6ed74648-d2d3-460f-aec1-45e2a3294743_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_5b405394-5bf6-49f4-b0d8-4ce62a2e006c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesPeriodPastDueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueAxis_6ed74648-d2d3-460f-aec1-45e2a3294743" xlink:to="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_5b405394-5bf6-49f4-b0d8-4ce62a2e006c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetPastDueMember_7ea9031d-d233-457a-ac93-fb8c26de8bd8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_5b405394-5bf6-49f4-b0d8-4ce62a2e006c" xlink:to="loc_us-gaap_FinancialAssetPastDueMember_7ea9031d-d233-457a-ac93-fb8c26de8bd8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_9c9ca48b-1192-4335-a8a4-cb9ab79adfa4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables30To59DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialAssetPastDueMember_7ea9031d-d233-457a-ac93-fb8c26de8bd8" xlink:to="loc_us-gaap_FinancingReceivables30To59DaysPastDueMember_9c9ca48b-1192-4335-a8a4-cb9ab79adfa4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_f8123cb1-0859-4336-a59a-49fe90ae2659" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivables60To89DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialAssetPastDueMember_7ea9031d-d233-457a-ac93-fb8c26de8bd8" xlink:to="loc_us-gaap_FinancingReceivables60To89DaysPastDueMember_f8123cb1-0859-4336-a59a-49fe90ae2659" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_39bba734-2759-4872-b972-eaca3486a03c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialAssetPastDueMember_7ea9031d-d233-457a-ac93-fb8c26de8bd8" xlink:to="loc_us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember_39bba734-2759-4872-b972-eaca3486a03c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetNotPastDueMember_00380354-7e00-47dc-8cba-ce2a2ed8c794" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetNotPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablesPeriodPastDueDomain_5b405394-5bf6-49f4-b0d8-4ce62a2e006c" xlink:to="loc_us-gaap_FinancialAssetNotPastDueMember_00380354-7e00-47dc-8cba-ce2a2ed8c794" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_55147c0e-9f4e-401d-a444-ee2cb87be4f8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_5f39299e-f80c-4bdf-9a58-65ce3380bc12" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_55147c0e-9f4e-401d-a444-ee2cb87be4f8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterest90DaysOrMorePastDueStillAccruing_e9ad4b11-2bf9-4f39-a4ed-585ada3f1f16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterest90DaysOrMorePastDueStillAccruing"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_5f39299e-f80c-4bdf-9a58-65ce3380bc12" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterest90DaysOrMorePastDueStillAccruing_e9ad4b11-2bf9-4f39-a4ed-585ada3f1f16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_0b67306d-34ef-4c6c-894a-fb8153349b82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_5f39299e-f80c-4bdf-9a58-65ce3380bc12" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus_0b67306d-34ef-4c6c-894a-fb8153349b82" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesScheduleofLoansbyCreditQualityIndicatorsDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#AllowanceforCreditLossesScheduleofLoansbyCreditQualityIndicatorsDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesScheduleofLoansbyCreditQualityIndicatorsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_b96f6d43-5779-4a1f-938d-14c48a925091" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_802eb44a-d5d1-4d65-930d-d181e97a5efb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_b96f6d43-5779-4a1f-938d-14c48a925091" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_802eb44a-d5d1-4d65-930d-d181e97a5efb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_40b2eee7-cb65-4b3a-a96e-a6cfa1419202" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_802eb44a-d5d1-4d65-930d-d181e97a5efb" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_40b2eee7-cb65-4b3a-a96e-a6cfa1419202" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_40b2eee7-cb65-4b3a-a96e-a6cfa1419202_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_40b2eee7-cb65-4b3a-a96e-a6cfa1419202" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_40b2eee7-cb65-4b3a-a96e-a6cfa1419202_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_f66afdd2-b271-421f-af8a-595fceffe113" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_40b2eee7-cb65-4b3a-a96e-a6cfa1419202" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_f66afdd2-b271-421f-af8a-595fceffe113" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_f7d81791-0367-4ce0-81a1-952960c53f14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialRealEstatePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_f66afdd2-b271-421f-af8a-595fceffe113" xlink:to="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_f7d81791-0367-4ce0-81a1-952960c53f14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_OwnerOccupiedCommercialRealEstateMember_ab9d7e14-87cb-473d-826c-52773461e94c" xlink:href="bhrb-20250630.xsd#bhrb_OwnerOccupiedCommercialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_f66afdd2-b271-421f-af8a-595fceffe113" xlink:to="loc_bhrb_OwnerOccupiedCommercialRealEstateMember_ab9d7e14-87cb-473d-826c-52773461e94c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_AcquisitionConstructionAndDevelopmentMember_615c6e58-7b4d-4cea-a3fa-45f8ecd6026a" xlink:href="bhrb-20250630.xsd#bhrb_AcquisitionConstructionAndDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_f66afdd2-b271-421f-af8a-595fceffe113" xlink:to="loc_bhrb_AcquisitionConstructionAndDevelopmentMember_615c6e58-7b4d-4cea-a3fa-45f8ecd6026a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_73111b4e-9c3a-4c3c-ba78-08729e7417fe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_f66afdd2-b271-421f-af8a-595fceffe113" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_73111b4e-9c3a-4c3c-ba78-08729e7417fe" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_OneToFourFamilyResidentialLoansMember_4cf83d05-a421-46d6-a6f4-b1257adcc180" xlink:href="bhrb-20250630.xsd#bhrb_OneToFourFamilyResidentialLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_f66afdd2-b271-421f-af8a-595fceffe113" xlink:to="loc_bhrb_OneToFourFamilyResidentialLoansMember_4cf83d05-a421-46d6-a6f4-b1257adcc180" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ConsumerNonRealEstateAndOtherMember_3a98dcaf-abb9-4a30-8671-5fcf2574aa98" xlink:href="bhrb-20250630.xsd#bhrb_ConsumerNonRealEstateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_f66afdd2-b271-421f-af8a-595fceffe113" xlink:to="loc_bhrb_ConsumerNonRealEstateAndOtherMember_3a98dcaf-abb9-4a30-8671-5fcf2574aa98" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentAxis_e3187820-f2cc-464d-b3a1-a41b40bee903" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InternalCreditAssessmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_802eb44a-d5d1-4d65-930d-d181e97a5efb" xlink:to="loc_us-gaap_InternalCreditAssessmentAxis_e3187820-f2cc-464d-b3a1-a41b40bee903" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_e3187820-f2cc-464d-b3a1-a41b40bee903_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InternalCreditAssessmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_e3187820-f2cc-464d-b3a1-a41b40bee903" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_e3187820-f2cc-464d-b3a1-a41b40bee903_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalCreditAssessmentDomain_fbb42211-5878-4525-b326-408ee1d4322b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InternalCreditAssessmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_InternalCreditAssessmentAxis_e3187820-f2cc-464d-b3a1-a41b40bee903" xlink:to="loc_us-gaap_InternalCreditAssessmentDomain_fbb42211-5878-4525-b326-408ee1d4322b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PassMember_2bc57a9c-2f32-41af-ab50-992a3f77d119" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PassMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_fbb42211-5878-4525-b326-408ee1d4322b" xlink:to="loc_us-gaap_PassMember_2bc57a9c-2f32-41af-ab50-992a3f77d119" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SpecialMentionMember_b28bfbc0-501d-43a3-894c-85579e75ba59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SpecialMentionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_fbb42211-5878-4525-b326-408ee1d4322b" xlink:to="loc_us-gaap_SpecialMentionMember_b28bfbc0-501d-43a3-894c-85579e75ba59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubstandardMember_0b819c29-a5cd-4c3e-95ef-e1d2a056def0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubstandardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_fbb42211-5878-4525-b326-408ee1d4322b" xlink:to="loc_us-gaap_SubstandardMember_0b819c29-a5cd-4c3e-95ef-e1d2a056def0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DoubtfulMember_69cf6b56-b971-429f-a9f6-40a26b5b909a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DoubtfulMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_fbb42211-5878-4525-b326-408ee1d4322b" xlink:to="loc_us-gaap_DoubtfulMember_69cf6b56-b971-429f-a9f6-40a26b5b909a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnlikelyToBeCollectedFinancingReceivableMember_47328ec8-60b1-4176-9caa-f85a0fd88a5c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnlikelyToBeCollectedFinancingReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_InternalCreditAssessmentDomain_fbb42211-5878-4525-b326-408ee1d4322b" xlink:to="loc_us-gaap_UnlikelyToBeCollectedFinancingReceivableMember_47328ec8-60b1-4176-9caa-f85a0fd88a5c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_2d6c6c11-e9b6-461a-b828-2251987e19bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_b96f6d43-5779-4a1f-938d-14c48a925091" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear_2d6c6c11-e9b6-461a-b828-2251987e19bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_16bfe1cf-e0bd-46b0-be09-4f2b12efa82a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_b96f6d43-5779-4a1f-938d-14c48a925091" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear_16bfe1cf-e0bd-46b0-be09-4f2b12efa82a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_e1268171-13bd-48a3-b812-a4fdf5939818" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_b96f6d43-5779-4a1f-938d-14c48a925091" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear_e1268171-13bd-48a3-b812-a4fdf5939818" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_03068c89-4262-4e16-986f-fde38b4a171a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_b96f6d43-5779-4a1f-938d-14c48a925091" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear_03068c89-4262-4e16-986f-fde38b4a171a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_56f2122e-8d2f-42c2-8c90-39b60cabae34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_b96f6d43-5779-4a1f-938d-14c48a925091" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear_56f2122e-8d2f-42c2-8c90-39b60cabae34" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_6c301d71-db0a-44a1-9e57-5725224bb32f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_b96f6d43-5779-4a1f-938d-14c48a925091" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear_6c301d71-db0a-44a1-9e57-5725224bb32f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_930f8c34-43b8-465f-9714-3a9065bb7c4c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolving"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_b96f6d43-5779-4a1f-938d-14c48a925091" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolving_930f8c34-43b8-465f-9714-3a9065bb7c4c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_bd28234d-1dca-4787-a3db-0f4479db58b6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_b96f6d43-5779-4a1f-938d-14c48a925091" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss_bd28234d-1dca-4787-a3db-0f4479db58b6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_368b8d49-6522-400d-a957-7e74fa3007fb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_b96f6d43-5779-4a1f-938d-14c48a925091" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_368b8d49-6522-400d-a957-7e74fa3007fb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_6d2b8827-8ee9-4185-abf9-7bc6dc473434" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_368b8d49-6522-400d-a957-7e74fa3007fb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff_6d2b8827-8ee9-4185-abf9-7bc6dc473434" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_b185086e-0e93-4a6e-9ecb-4937c0eddefa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_368b8d49-6522-400d-a957-7e74fa3007fb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff_b185086e-0e93-4a6e-9ecb-4937c0eddefa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_07c2c1a4-873b-459f-b8f2-43a1342226b3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_368b8d49-6522-400d-a957-7e74fa3007fb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff_07c2c1a4-873b-459f-b8f2-43a1342226b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_7031472e-18cd-499f-ac58-498ee4ab5f20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_368b8d49-6522-400d-a957-7e74fa3007fb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff_7031472e-18cd-499f-ac58-498ee4ab5f20" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_4de9ed42-2c69-4c69-b91e-5c6f47ffe8a5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_368b8d49-6522-400d-a957-7e74fa3007fb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff_4de9ed42-2c69-4c69-b91e-5c6f47ffe8a5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_b4b9f9f6-01c6-422b-b80e-f20d16046689" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_368b8d49-6522-400d-a957-7e74fa3007fb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff_b4b9f9f6-01c6-422b-b80e-f20d16046689" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_9dde471f-e04f-403f-b6d8-eb9343d1b1bb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_368b8d49-6522-400d-a957-7e74fa3007fb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff_9dde471f-e04f-403f-b6d8-eb9343d1b1bb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_7d86541e-7de2-4c45-b2f6-361c9a18fddc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoffByOriginationYearAbstract_368b8d49-6522-400d-a957-7e74fa3007fb" xlink:to="loc_us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff_7d86541e-7de2-4c45-b2f6-361c9a18fddc" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesScheduleofCollateralDependentLoansIndividuallyEvaluatedDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#AllowanceforCreditLossesScheduleofCollateralDependentLoansIndividuallyEvaluatedDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/AllowanceforCreditLossesScheduleofCollateralDependentLoansIndividuallyEvaluatedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_5d3a50de-d397-42a7-b53d-829ed6d97993" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_0a98045a-3285-4017-8063-9eadcfdc28a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_5d3a50de-d397-42a7-b53d-829ed6d97993" xlink:to="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_0a98045a-3285-4017-8063-9eadcfdc28a0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralAxis_3e9e69ec-7bf7-424d-8be1-4627df731cca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_0a98045a-3285-4017-8063-9eadcfdc28a0" xlink:to="loc_us-gaap_CollateralAxis_3e9e69ec-7bf7-424d-8be1-4627df731cca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_3e9e69ec-7bf7-424d-8be1-4627df731cca_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CollateralAxis_3e9e69ec-7bf7-424d-8be1-4627df731cca" xlink:to="loc_us-gaap_CollateralDomain_3e9e69ec-7bf7-424d-8be1-4627df731cca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralDomain_54b37833-0cb0-4568-b9f3-bc4150b070d5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CollateralAxis_3e9e69ec-7bf7-424d-8be1-4627df731cca" xlink:to="loc_us-gaap_CollateralDomain_54b37833-0cb0-4568-b9f3-bc4150b070d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CollateralPledgedMember_58353345-bd66-45ec-82c4-2f0ec2a776f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CollateralPledgedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CollateralDomain_54b37833-0cb0-4568-b9f3-bc4150b070d5" xlink:to="loc_us-gaap_CollateralPledgedMember_58353345-bd66-45ec-82c4-2f0ec2a776f9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_f44201f6-f5e8-4e63-8123-4cc8cebf04e8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFinancingReceivableAllowanceForCreditLossesTable_0a98045a-3285-4017-8063-9eadcfdc28a0" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_f44201f6-f5e8-4e63-8123-4cc8cebf04e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_f44201f6-f5e8-4e63-8123-4cc8cebf04e8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_f44201f6-f5e8-4e63-8123-4cc8cebf04e8" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_f44201f6-f5e8-4e63-8123-4cc8cebf04e8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_95f4bc89-888a-4d19-880a-7a16ae6c9259" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivablePortfolioSegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentAxis_f44201f6-f5e8-4e63-8123-4cc8cebf04e8" xlink:to="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_95f4bc89-888a-4d19-880a-7a16ae6c9259" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_1f187ea1-bf17-4c03-8c91-fc485c5b50a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialRealEstatePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_95f4bc89-888a-4d19-880a-7a16ae6c9259" xlink:to="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_1f187ea1-bf17-4c03-8c91-fc485c5b50a0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_OwnerOccupiedCommercialRealEstateMember_aa2ae5c0-dc6c-4110-ac86-d16d2d0b8342" xlink:href="bhrb-20250630.xsd#bhrb_OwnerOccupiedCommercialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_95f4bc89-888a-4d19-880a-7a16ae6c9259" xlink:to="loc_bhrb_OwnerOccupiedCommercialRealEstateMember_aa2ae5c0-dc6c-4110-ac86-d16d2d0b8342" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_AcquisitionConstructionAndDevelopmentMember_46696460-a919-4e39-8cde-00c8dc8a1a94" xlink:href="bhrb-20250630.xsd#bhrb_AcquisitionConstructionAndDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_95f4bc89-888a-4d19-880a-7a16ae6c9259" xlink:to="loc_bhrb_AcquisitionConstructionAndDevelopmentMember_46696460-a919-4e39-8cde-00c8dc8a1a94" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_411b0d8a-94b0-45c0-a673-d814fe964483" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_95f4bc89-888a-4d19-880a-7a16ae6c9259" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_411b0d8a-94b0-45c0-a673-d814fe964483" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_OneToFourFamilyResidentialLoansMember_82078b29-09e1-4c5c-a925-1dfea44eec2b" xlink:href="bhrb-20250630.xsd#bhrb_OneToFourFamilyResidentialLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_95f4bc89-888a-4d19-880a-7a16ae6c9259" xlink:to="loc_bhrb_OneToFourFamilyResidentialLoansMember_82078b29-09e1-4c5c-a925-1dfea44eec2b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ConsumerNonRealEstateAndOtherMember_8d2cb139-a64c-40f0-9c91-599b56676602" xlink:href="bhrb-20250630.xsd#bhrb_ConsumerNonRealEstateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivablePortfolioSegmentDomain_95f4bc89-888a-4d19-880a-7a16ae6c9259" xlink:to="loc_bhrb_ConsumerNonRealEstateAndOtherMember_8d2cb139-a64c-40f0-9c91-599b56676602" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_FinancingReceivableIndividuallyEvaluatedWithAllowanceForCreditLossAbstract_d05ddfca-e47f-430a-9271-8b0f0e249116" xlink:href="bhrb-20250630.xsd#bhrb_FinancingReceivableIndividuallyEvaluatedWithAllowanceForCreditLossAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_5d3a50de-d397-42a7-b53d-829ed6d97993" xlink:to="loc_bhrb_FinancingReceivableIndividuallyEvaluatedWithAllowanceForCreditLossAbstract_d05ddfca-e47f-430a-9271-8b0f0e249116" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedWithAllowanceForCreditLoss_3683396c-1b78-4961-970e-753b70973131" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableIndividuallyEvaluatedWithAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bhrb_FinancingReceivableIndividuallyEvaluatedWithAllowanceForCreditLossAbstract_d05ddfca-e47f-430a-9271-8b0f0e249116" xlink:to="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedWithAllowanceForCreditLoss_3683396c-1b78-4961-970e-753b70973131" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1_829d14ce-2145-4a5f-a819-c25061996c04" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bhrb_FinancingReceivableIndividuallyEvaluatedWithAllowanceForCreditLossAbstract_d05ddfca-e47f-430a-9271-8b0f0e249116" xlink:to="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1_829d14ce-2145-4a5f-a819-c25061996c04" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedWithoutAllowanceForCreditLoss_8a6c1215-ab0b-4506-a0de-c85aa4b3690b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableIndividuallyEvaluatedWithoutAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_5d3a50de-d397-42a7-b53d-829ed6d97993" xlink:to="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedWithoutAllowanceForCreditLoss_8a6c1215-ab0b-4506-a0de-c85aa4b3690b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_3e84e8ca-cf6a-48de-af97-5164f0bcdf20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableAllowanceForCreditLossesLineItems_5d3a50de-d397-42a7-b53d-829ed6d97993" xlink:to="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_3e84e8ca-cf6a-48de-af97-5164f0bcdf20" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/BorrowedFundsNarrativeDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#BorrowedFundsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/BorrowedFundsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShortTermDebtTable_c37bf7af-1d7d-4bff-aa5d-e18190221de4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShortTermDebtTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_ScheduleOfShortTermDebtTable_c37bf7af-1d7d-4bff-aa5d-e18190221de4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_0a91c38f-b05a-4860-92e9-229ce5c6c1c2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_c37bf7af-1d7d-4bff-aa5d-e18190221de4" xlink:to="loc_srt_RangeAxis_0a91c38f-b05a-4860-92e9-229ce5c6c1c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_0a91c38f-b05a-4860-92e9-229ce5c6c1c2_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_0a91c38f-b05a-4860-92e9-229ce5c6c1c2" xlink:to="loc_srt_RangeMember_0a91c38f-b05a-4860-92e9-229ce5c6c1c2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_99e16297-5379-4cad-9502-acb349165e24" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_0a91c38f-b05a-4860-92e9-229ce5c6c1c2" xlink:to="loc_srt_RangeMember_99e16297-5379-4cad-9502-acb349165e24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_c6a2397c-6503-4459-bf13-bef8d9a8f0e3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_99e16297-5379-4cad-9502-acb349165e24" xlink:to="loc_srt_MinimumMember_c6a2397c-6503-4459-bf13-bef8d9a8f0e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_6561c063-58c9-43ec-bee5-d161c118a174" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_99e16297-5379-4cad-9502-acb349165e24" xlink:to="loc_srt_MaximumMember_6561c063-58c9-43ec-bee5-d161c118a174" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipAxis_61f0a756-0c97-41c1-9494-32bd394c5a4d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_c37bf7af-1d7d-4bff-aa5d-e18190221de4" xlink:to="loc_srt_OwnershipAxis_61f0a756-0c97-41c1-9494-32bd394c5a4d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_61f0a756-0c97-41c1-9494-32bd394c5a4d_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_OwnershipAxis_61f0a756-0c97-41c1-9494-32bd394c5a4d" xlink:to="loc_srt_OwnershipDomain_61f0a756-0c97-41c1-9494-32bd394c5a4d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_OwnershipDomain_ddc104cb-82b6-42b3-ba67-ab171ec607e4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_OwnershipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_OwnershipAxis_61f0a756-0c97-41c1-9494-32bd394c5a4d" xlink:to="loc_srt_OwnershipDomain_ddc104cb-82b6-42b3-ba67-ab171ec607e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SFGCapitalTrustIMember_a7428246-f1b2-4147-81f9-12c5a6e2d71f" xlink:href="bhrb-20250630.xsd#bhrb_SFGCapitalTrustIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_ddc104cb-82b6-42b3-ba67-ab171ec607e4" xlink:to="loc_bhrb_SFGCapitalTrustIMember_a7428246-f1b2-4147-81f9-12c5a6e2d71f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SFGCapitalTrustIIMember_0fc4819b-3210-4a6a-8c7c-184bd7e4f167" xlink:href="bhrb-20250630.xsd#bhrb_SFGCapitalTrustIIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_ddc104cb-82b6-42b3-ba67-ab171ec607e4" xlink:to="loc_bhrb_SFGCapitalTrustIIMember_0fc4819b-3210-4a6a-8c7c-184bd7e4f167" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SFGCapitalTrustIIIMember_a7120fa0-5ba8-4f21-975b-26d526be27ec" xlink:href="bhrb-20250630.xsd#bhrb_SFGCapitalTrustIIIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_OwnershipDomain_ddc104cb-82b6-42b3-ba67-ab171ec607e4" xlink:to="loc_bhrb_SFGCapitalTrustIIIMember_a7120fa0-5ba8-4f21-975b-26d526be27ec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_e741f123-1a43-49d5-9816-967bdee55751" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_c37bf7af-1d7d-4bff-aa5d-e18190221de4" xlink:to="loc_us-gaap_DebtInstrumentAxis_e741f123-1a43-49d5-9816-967bdee55751" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_e741f123-1a43-49d5-9816-967bdee55751_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_e741f123-1a43-49d5-9816-967bdee55751" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_e741f123-1a43-49d5-9816-967bdee55751_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_6e669df4-916c-4890-8369-f2129fb1511b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_e741f123-1a43-49d5-9816-967bdee55751" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_6e669df4-916c-4890-8369-f2129fb1511b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SubordinatedDebenturesIssuedInFourthQuarterOf2021Member_6f932683-d35f-45d1-a51d-41b734d6fe2a" xlink:href="bhrb-20250630.xsd#bhrb_SubordinatedDebenturesIssuedInFourthQuarterOf2021Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6e669df4-916c-4890-8369-f2129fb1511b" xlink:to="loc_bhrb_SubordinatedDebenturesIssuedInFourthQuarterOf2021Member_6f932683-d35f-45d1-a51d-41b734d6fe2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SubordinatedDebenturesIssuedInThirdQuarterOf2020Member_d8977b48-354f-442a-a020-589b2dd5f8dd" xlink:href="bhrb-20250630.xsd#bhrb_SubordinatedDebenturesIssuedInThirdQuarterOf2020Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_6e669df4-916c-4890-8369-f2129fb1511b" xlink:to="loc_bhrb_SubordinatedDebenturesIssuedInThirdQuarterOf2020Member_d8977b48-354f-442a-a020-589b2dd5f8dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_bdc31425-3140-4d18-9ef3-cc2a0f3f2b1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_c37bf7af-1d7d-4bff-aa5d-e18190221de4" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_bdc31425-3140-4d18-9ef3-cc2a0f3f2b1e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_bdc31425-3140-4d18-9ef3-cc2a0f3f2b1e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_bdc31425-3140-4d18-9ef3-cc2a0f3f2b1e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_bdc31425-3140-4d18-9ef3-cc2a0f3f2b1e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4379cc66-10b9-42ed-9a57-d7938ec7adb5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_bdc31425-3140-4d18-9ef3-cc2a0f3f2b1e" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4379cc66-10b9-42ed-9a57-d7938ec7adb5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubordinatedDebtMember_902d98a8-517b-4c0c-add7-4fdf0bbaf308" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubordinatedDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4379cc66-10b9-42ed-9a57-d7938ec7adb5" xlink:to="loc_us-gaap_SubordinatedDebtMember_902d98a8-517b-4c0c-add7-4fdf0bbaf308" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SubordinatedDebtOwedToUnconsolidatedSubsidiaryTrustsMember_53f85fb7-7e48-4b7f-845f-abc71b39a589" xlink:href="bhrb-20250630.xsd#bhrb_SubordinatedDebtOwedToUnconsolidatedSubsidiaryTrustsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4379cc66-10b9-42ed-9a57-d7938ec7adb5" xlink:to="loc_bhrb_SubordinatedDebtOwedToUnconsolidatedSubsidiaryTrustsMember_53f85fb7-7e48-4b7f-845f-abc71b39a589" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_8612cfb2-974b-411b-b062-2d5c80cee19c" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_c37bf7af-1d7d-4bff-aa5d-e18190221de4" xlink:to="loc_dei_LegalEntityAxis_8612cfb2-974b-411b-b062-2d5c80cee19c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_8612cfb2-974b-411b-b062-2d5c80cee19c_default" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_8612cfb2-974b-411b-b062-2d5c80cee19c" xlink:to="loc_dei_EntityDomain_8612cfb2-974b-411b-b062-2d5c80cee19c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_5849b925-f46a-4f88-8014-16e413bfe13b" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_8612cfb2-974b-411b-b062-2d5c80cee19c" xlink:to="loc_dei_EntityDomain_5849b925-f46a-4f88-8014-16e413bfe13b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SFGCapitalTrustIMember_647490b1-d977-4282-8088-104047b56fa1" xlink:href="bhrb-20250630.xsd#bhrb_SFGCapitalTrustIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_5849b925-f46a-4f88-8014-16e413bfe13b" xlink:to="loc_bhrb_SFGCapitalTrustIMember_647490b1-d977-4282-8088-104047b56fa1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SFGCapitalTrustIIMember_d6a83c20-0ca6-4d24-bc10-f7ce49647f61" xlink:href="bhrb-20250630.xsd#bhrb_SFGCapitalTrustIIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_5849b925-f46a-4f88-8014-16e413bfe13b" xlink:to="loc_bhrb_SFGCapitalTrustIIMember_d6a83c20-0ca6-4d24-bc10-f7ce49647f61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SFGCapitalTrustIIIMember_3b2044e4-4d0d-4e4d-99eb-ebe1bdbadd0d" xlink:href="bhrb-20250630.xsd#bhrb_SFGCapitalTrustIIIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_5849b925-f46a-4f88-8014-16e413bfe13b" xlink:to="loc_bhrb_SFGCapitalTrustIIIMember_3b2044e4-4d0d-4e4d-99eb-ebe1bdbadd0d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_6c36ffee-7faa-4d1b-a74f-67e2c42be07b" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CounterpartyNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShortTermDebtTable_c37bf7af-1d7d-4bff-aa5d-e18190221de4" xlink:to="loc_srt_CounterpartyNameAxis_6c36ffee-7faa-4d1b-a74f-67e2c42be07b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_6c36ffee-7faa-4d1b-a74f-67e2c42be07b_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CounterpartyNameAxis_6c36ffee-7faa-4d1b-a74f-67e2c42be07b" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_6c36ffee-7faa-4d1b-a74f-67e2c42be07b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_3f96287c-d444-44f8-97dd-e243c68b6162" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RepurchaseAgreementCounterpartyNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CounterpartyNameAxis_6c36ffee-7faa-4d1b-a74f-67e2c42be07b" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_3f96287c-d444-44f8-97dd-e243c68b6162" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SFGCapitalTrustIMember_f19ea54d-103f-49de-ac6a-c1fbf752304f" xlink:href="bhrb-20250630.xsd#bhrb_SFGCapitalTrustIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_3f96287c-d444-44f8-97dd-e243c68b6162" xlink:to="loc_bhrb_SFGCapitalTrustIMember_f19ea54d-103f-49de-ac6a-c1fbf752304f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SFGCapitalTrustIIMember_8310328f-3cfc-4e31-b7cd-eb5325739bf8" xlink:href="bhrb-20250630.xsd#bhrb_SFGCapitalTrustIIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_3f96287c-d444-44f8-97dd-e243c68b6162" xlink:to="loc_bhrb_SFGCapitalTrustIIMember_8310328f-3cfc-4e31-b7cd-eb5325739bf8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SFGCapitalTrustIIIMember_263f1c23-5098-4ee1-a8c6-87559f02339d" xlink:href="bhrb-20250630.xsd#bhrb_SFGCapitalTrustIIIMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_3f96287c-d444-44f8-97dd-e243c68b6162" xlink:to="loc_bhrb_SFGCapitalTrustIIIMember_263f1c23-5098-4ee1-a8c6-87559f02339d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_5b61cf8b-2a07-4ebf-b873-a4bab56f4def" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_ShortTermBorrowings_5b61cf8b-2a07-4ebf-b873-a4bab56f4def" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtWeightedAverageInterestRate_b87e0193-016f-4120-9b40-ea7d4b16faf4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShortTermDebtWeightedAverageInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_ShortTermDebtWeightedAverageInterestRate_b87e0193-016f-4120-9b40-ea7d4b16faf4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShorttermDebtAverageOutstandingAmount_a426c99c-a8f5-4653-b09a-2e80bef7d535" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShorttermDebtAverageOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_ShorttermDebtAverageOutstandingAmount_a426c99c-a8f5-4653-b09a-2e80bef7d535" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_FederalHomeLoanBankAndUnsecuredFederalFundsAdvancesGeneralDebtObligationsAmountOfAvailableUnusedFunds_765f92df-18c8-4a2e-9282-8b90412b9145" xlink:href="bhrb-20250630.xsd#bhrb_FederalHomeLoanBankAndUnsecuredFederalFundsAdvancesGeneralDebtObligationsAmountOfAvailableUnusedFunds"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_bhrb_FederalHomeLoanBankAndUnsecuredFederalFundsAdvancesGeneralDebtObligationsAmountOfAvailableUnusedFunds_765f92df-18c8-4a2e-9282-8b90412b9145" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_FederalHomeLoanBankAndUnsecuredFederalFundsAdvancesGeneralDebtObligationsDisclosuresCollateralPledged_72eb2950-f579-4ce6-99ae-e99b3b9d98d1" xlink:href="bhrb-20250630.xsd#bhrb_FederalHomeLoanBankAndUnsecuredFederalFundsAdvancesGeneralDebtObligationsDisclosuresCollateralPledged"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_bhrb_FederalHomeLoanBankAndUnsecuredFederalFundsAdvancesGeneralDebtObligationsDisclosuresCollateralPledged_72eb2950-f579-4ce6-99ae-e99b3b9d98d1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_6ac7e085-a2e0-4a97-ad25-abef04e75bd6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_6ac7e085-a2e0-4a97-ad25-abef04e75bd6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_8b9fc793-9ad3-446b-9d5d-af961098efc8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_LongTermDebtFairValue_8b9fc793-9ad3-446b-9d5d-af961098efc8" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_23355fe3-5f3c-42e8-a5f7-86135535d60f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumNet_23355fe3-5f3c-42e8-a5f7-86135535d60f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_9402caa4-f92a-4733-9bac-0101475d57a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_LongTermDebt_9402caa4-f92a-4733-9bac-0101475d57a7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BankingRegulationTier2RiskBasedCapitalPeriodToMaturity_a1cb40dc-705c-4d20-a82c-cbcb4e5a8e98" xlink:href="bhrb-20250630.xsd#bhrb_BankingRegulationTier2RiskBasedCapitalPeriodToMaturity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_bhrb_BankingRegulationTier2RiskBasedCapitalPeriodToMaturity_a1cb40dc-705c-4d20-a82c-cbcb4e5a8e98" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BankingRegulationTier2RiskBasedCapitalAnnualReductionInQualifyingAmountPercentage_049dcb2f-8cc8-4f7e-be4a-1d121bd223dc" xlink:href="bhrb-20250630.xsd#bhrb_BankingRegulationTier2RiskBasedCapitalAnnualReductionInQualifyingAmountPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_bhrb_BankingRegulationTier2RiskBasedCapitalAnnualReductionInQualifyingAmountPercentage_049dcb2f-8cc8-4f7e-be4a-1d121bd223dc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubordinatedBorrowingInterestRate_1ff6371f-3a25-4954-9116-170029afecc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubordinatedBorrowingInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_SubordinatedBorrowingInterestRate_1ff6371f-3a25-4954-9116-170029afecc7" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_20096ab1-c1ed-4c4e-ad84-6d32ede7bae2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_20096ab1-c1ed-4c4e-ad84-6d32ede7bae2" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTerm_407740b6-31be-4283-af0a-aba95026eac2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_DebtInstrumentTerm_407740b6-31be-4283-af0a-aba95026eac2" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_DebtInstrumentNotAbleToPrepayPeriodAfterIssuance_a4b1c666-d718-4b8e-9619-efdf4af2d38a" xlink:href="bhrb-20250630.xsd#bhrb_DebtInstrumentNotAbleToPrepayPeriodAfterIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_bhrb_DebtInstrumentNotAbleToPrepayPeriodAfterIssuance_a4b1c666-d718-4b8e-9619-efdf4af2d38a" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_cdd17231-004b-4386-b2a1-bf52f1ce54d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_MinorityInterestOwnershipPercentageByParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_MinorityInterestOwnershipPercentageByParent_cdd17231-004b-4386-b2a1-bf52f1ce54d6" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfMandatoryRedeemableCapitalSecurities_a02ece52-6037-4af8-9ff3-d1bc05fbd01f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfMandatoryRedeemableCapitalSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfMandatoryRedeemableCapitalSecurities_a02ece52-6037-4af8-9ff3-d1bc05fbd01f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_388942af-5508-439c-831e-bec243fd7b55" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ProceedsFromIssuanceOfCommonStock"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfCommonStock_388942af-5508-439c-831e-bec243fd7b55" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust_fb831bd5-236c-492e-9949-9d4535cca4af" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtLineItems_b5916d86-0ee1-417e-9c37-d9b65aaacef9" xlink:to="loc_us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust_fb831bd5-236c-492e-9949-9d4535cca4af" xlink:type="arc" order="18"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/BorrowedFundsScheduleofRemainingMaturitiesofSubordinatedDebenturesDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#BorrowedFundsScheduleofRemainingMaturitiesofSubordinatedDebenturesDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/BorrowedFundsScheduleofRemainingMaturitiesofSubordinatedDebenturesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_86314535-e672-4784-930c-bf9188139b47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_79b60ab2-9065-4d64-b1f9-ec10c65132ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_86314535-e672-4784-930c-bf9188139b47" xlink:to="loc_us-gaap_DebtInstrumentTable_79b60ab2-9065-4d64-b1f9-ec10c65132ce" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_4849dbb3-53fa-4449-aebe-cca476520126" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_79b60ab2-9065-4d64-b1f9-ec10c65132ce" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_4849dbb3-53fa-4449-aebe-cca476520126" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4849dbb3-53fa-4449-aebe-cca476520126_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4849dbb3-53fa-4449-aebe-cca476520126" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4849dbb3-53fa-4449-aebe-cca476520126_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_857a54a1-5f49-4bb8-af15-f955c4b1e8ef" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_4849dbb3-53fa-4449-aebe-cca476520126" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_857a54a1-5f49-4bb8-af15-f955c4b1e8ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubordinatedDebtMember_93ae708f-93f6-428e-a11c-ee203f7d7f3b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubordinatedDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_857a54a1-5f49-4bb8-af15-f955c4b1e8ef" xlink:to="loc_us-gaap_SubordinatedDebtMember_93ae708f-93f6-428e-a11c-ee203f7d7f3b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SubordinatedDebtOwedToUnconsolidatedSubsidiaryTrustsMember_d3f231bf-b369-43af-bb41-a36722e20123" xlink:href="bhrb-20250630.xsd#bhrb_SubordinatedDebtOwedToUnconsolidatedSubsidiaryTrustsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_857a54a1-5f49-4bb8-af15-f955c4b1e8ef" xlink:to="loc_bhrb_SubordinatedDebtOwedToUnconsolidatedSubsidiaryTrustsMember_d3f231bf-b369-43af-bb41-a36722e20123" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear_7fa64c57-6b7b-4463-a4ac-ca7fba4866a2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_86314535-e672-4784-930c-bf9188139b47" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalRemainderOfFiscalYear_7fa64c57-6b7b-4463-a4ac-ca7fba4866a2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_657eea58-9d05-448f-a1ee-e30cd3ade6b9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_86314535-e672-4784-930c-bf9188139b47" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_657eea58-9d05-448f-a1ee-e30cd3ade6b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_035a7baf-fdac-480e-8d7d-d387b859a782" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_86314535-e672-4784-930c-bf9188139b47" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_035a7baf-fdac-480e-8d7d-d387b859a782" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_b5914db6-c4eb-4223-939a-02e5fa37ffdd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_86314535-e672-4784-930c-bf9188139b47" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_b5914db6-c4eb-4223-939a-02e5fa37ffdd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_88a92c67-714a-4d0a-8af7-f68ded41c79a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_86314535-e672-4784-930c-bf9188139b47" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_88a92c67-714a-4d0a-8af7-f68ded41c79a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_LongTermDebtMaturityAfterYearFour_110dce3d-3d2f-4f5c-a153-220c3155596c" xlink:href="bhrb-20250630.xsd#bhrb_LongTermDebtMaturityAfterYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_86314535-e672-4784-930c-bf9188139b47" xlink:to="loc_bhrb_LongTermDebtMaturityAfterYearFour_110dce3d-3d2f-4f5c-a153-220c3155596c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_a0b43b2f-6718-4819-83d7-1a28a9cb1ba7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_86314535-e672-4784-930c-bf9188139b47" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_a0b43b2f-6718-4819-83d7-1a28a9cb1ba7" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/LeasedPropertyNarrativeDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#LeasedPropertyNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/LeasedPropertyNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeaseDescriptionLineItems_6436f948-806e-4f25-a72b-ad22295a6ebe" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LessorLeaseDescriptionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeaseDescriptionTable_850753d1-f00d-499c-88d2-01d133f75702" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LessorLeaseDescriptionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_6436f948-806e-4f25-a72b-ad22295a6ebe" xlink:to="loc_us-gaap_LessorLeaseDescriptionTable_850753d1-f00d-499c-88d2-01d133f75702" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_49bed211-041a-4fe0-ace5-99de24ec91eb" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LessorLeaseDescriptionTable_850753d1-f00d-499c-88d2-01d133f75702" xlink:to="loc_srt_RangeAxis_49bed211-041a-4fe0-ace5-99de24ec91eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_49bed211-041a-4fe0-ace5-99de24ec91eb_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_49bed211-041a-4fe0-ace5-99de24ec91eb" xlink:to="loc_srt_RangeMember_49bed211-041a-4fe0-ace5-99de24ec91eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_4cb3107c-6ca4-4219-94ab-01ef548848d2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_49bed211-041a-4fe0-ace5-99de24ec91eb" xlink:to="loc_srt_RangeMember_4cb3107c-6ca4-4219-94ab-01ef548848d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_26269fc8-989b-40e9-8777-520549e607e6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4cb3107c-6ca4-4219-94ab-01ef548848d2" xlink:to="loc_srt_MinimumMember_26269fc8-989b-40e9-8777-520549e607e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_e277a10d-d282-48f3-a882-844ee5bc5ff4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_4cb3107c-6ca4-4219-94ab-01ef548848d2" xlink:to="loc_srt_MaximumMember_e277a10d-d282-48f3-a882-844ee5bc5ff4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseTermOfContract_2561dabd-6934-4365-8a95-3b5ee97c1311" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LesseeOperatingLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_6436f948-806e-4f25-a72b-ad22295a6ebe" xlink:to="loc_us-gaap_LesseeOperatingLeaseTermOfContract_2561dabd-6934-4365-8a95-3b5ee97c1311" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_LesseeLeaseTermOfContract_04a4ee58-9579-466f-9f52-1e9b68762ab2" xlink:href="bhrb-20250630.xsd#bhrb_LesseeLeaseTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LessorLeaseDescriptionLineItems_6436f948-806e-4f25-a72b-ad22295a6ebe" xlink:to="loc_bhrb_LesseeLeaseTermOfContract_04a4ee58-9579-466f-9f52-1e9b68762ab2" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/RegulatoryCapitalMattersScheduleofActualandRequiredCapitalAmountsandRatiosDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#RegulatoryCapitalMattersScheduleofActualandRequiredCapitalAmountsandRatiosDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/RegulatoryCapitalMattersScheduleofActualandRequiredCapitalAmountsandRatiosDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_01449050-1ec9-424a-ac04-ad535f794d47" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable_037ff97f-bc8e-4b9c-90b3-f24ac21a4293" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_01449050-1ec9-424a-ac04-ad535f794d47" xlink:to="loc_us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable_037ff97f-bc8e-4b9c-90b3-f24ac21a4293" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesAxis_1968aaf3-727d-4d7e-8490-881a33e49401" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsTable_037ff97f-bc8e-4b9c-90b3-f24ac21a4293" xlink:to="loc_srt_ConsolidatedEntitiesAxis_1968aaf3-727d-4d7e-8490-881a33e49401" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_1968aaf3-727d-4d7e-8490-881a33e49401_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidatedEntitiesAxis_1968aaf3-727d-4d7e-8490-881a33e49401" xlink:to="loc_srt_ConsolidatedEntitiesDomain_1968aaf3-727d-4d7e-8490-881a33e49401_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidatedEntitiesDomain_97159b99-5891-4cd4-9ca1-c71dfb661d11" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidatedEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidatedEntitiesAxis_1968aaf3-727d-4d7e-8490-881a33e49401" xlink:to="loc_srt_ConsolidatedEntitiesDomain_97159b99-5891-4cd4-9ca1-c71dfb661d11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ParentCompanyMember_8257207c-0f2e-46c7-9994-54adb517c84f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ParentCompanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_97159b99-5891-4cd4-9ca1-c71dfb661d11" xlink:to="loc_srt_ParentCompanyMember_8257207c-0f2e-46c7-9994-54adb517c84f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SubsidiariesMember_492604d1-2c98-4a2a-938d-cb8c5b0b2454" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidatedEntitiesDomain_97159b99-5891-4cd4-9ca1-c71dfb661d11" xlink:to="loc_srt_SubsidiariesMember_492604d1-2c98-4a2a-938d-cb8c5b0b2454" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalAbstract_47f7366e-063b-4905-8bbd-d36f19ca2aeb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_01449050-1ec9-424a-ac04-ad535f794d47" xlink:to="loc_us-gaap_CapitalAbstract_47f7366e-063b-4905-8bbd-d36f19ca2aeb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Capital_c92ae198-ae14-4c13-9dab-5c48a9ec5f32" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Capital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalAbstract_47f7366e-063b-4905-8bbd-d36f19ca2aeb" xlink:to="loc_us-gaap_Capital_c92ae198-ae14-4c13-9dab-5c48a9ec5f32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalToRiskWeightedAssets_4591f1c6-edd1-4bbe-af89-e128b7943a57" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalToRiskWeightedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalAbstract_47f7366e-063b-4905-8bbd-d36f19ca2aeb" xlink:to="loc_us-gaap_CapitalToRiskWeightedAssets_4591f1c6-edd1-4bbe-af89-e128b7943a57" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalRequiredForCapitalAdequacy_1aaba355-0eef-4651-bda3-8802377f81c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalRequiredForCapitalAdequacy"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalAbstract_47f7366e-063b-4905-8bbd-d36f19ca2aeb" xlink:to="loc_us-gaap_CapitalRequiredForCapitalAdequacy_1aaba355-0eef-4651-bda3-8802377f81c0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets_d7749345-0098-4a9e-a4b3-2979c9736496" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalAbstract_47f7366e-063b-4905-8bbd-d36f19ca2aeb" xlink:to="loc_us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets_d7749345-0098-4a9e-a4b3-2979c9736496" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalRequiredToBeWellCapitalized_20113536-2021-4e67-8b22-004a384a3745" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalRequiredToBeWellCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalAbstract_47f7366e-063b-4905-8bbd-d36f19ca2aeb" xlink:to="loc_us-gaap_CapitalRequiredToBeWellCapitalized_20113536-2021-4e67-8b22-004a384a3745" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets_8e35803c-9afb-47a7-b866-a7e9baece6b2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CapitalAbstract_47f7366e-063b-4905-8bbd-d36f19ca2aeb" xlink:to="loc_us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets_8e35803c-9afb-47a7-b866-a7e9baece6b2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalAbstract_31e7132c-76d8-4426-8e12-99d1095341e6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneRiskBasedCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_01449050-1ec9-424a-ac04-ad535f794d47" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalAbstract_31e7132c-76d8-4426-8e12-99d1095341e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneRiskBasedCapital_dca12bc7-54fc-40e3-bf72-eaa97eb47b4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneRiskBasedCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneRiskBasedCapitalAbstract_31e7132c-76d8-4426-8e12-99d1095341e6" xlink:to="loc_us-gaap_TierOneRiskBasedCapital_dca12bc7-54fc-40e3-bf72-eaa97eb47b4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets_6b11ad50-3667-4535-b6e5-4b35fd9112bd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneRiskBasedCapitalAbstract_31e7132c-76d8-4426-8e12-99d1095341e6" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets_6b11ad50-3667-4535-b6e5-4b35fd9112bd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BankingRegulationTier1RiskBasedCapitalCapitalAdequacyWithBufferMinimum_1cb78e20-f9cf-4807-b84e-4882e50d46e8" xlink:href="bhrb-20250630.xsd#bhrb_BankingRegulationTier1RiskBasedCapitalCapitalAdequacyWithBufferMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneRiskBasedCapitalAbstract_31e7132c-76d8-4426-8e12-99d1095341e6" xlink:to="loc_bhrb_BankingRegulationTier1RiskBasedCapitalCapitalAdequacyWithBufferMinimum_1cb78e20-f9cf-4807-b84e-4882e50d46e8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BankingRegulationTier1RiskBasedCapitalRatioCapitalAdequacyWithBufferMinimum_31353886-0738-49cb-a6c4-8cde2e24627c" xlink:href="bhrb-20250630.xsd#bhrb_BankingRegulationTier1RiskBasedCapitalRatioCapitalAdequacyWithBufferMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneRiskBasedCapitalAbstract_31e7132c-76d8-4426-8e12-99d1095341e6" xlink:to="loc_bhrb_BankingRegulationTier1RiskBasedCapitalRatioCapitalAdequacyWithBufferMinimum_31353886-0738-49cb-a6c4-8cde2e24627c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized_e7b5e6a3-3459-4b90-9735-b9f6cc6264ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneRiskBasedCapitalAbstract_31e7132c-76d8-4426-8e12-99d1095341e6" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized_e7b5e6a3-3459-4b90-9735-b9f6cc6264ac" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets_e8a25a92-07f1-4077-9f74-b06224661c85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneRiskBasedCapitalAbstract_31e7132c-76d8-4426-8e12-99d1095341e6" xlink:to="loc_us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets_e8a25a92-07f1-4077-9f74-b06224661c85" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonEquityTierOneCapitalAbstract_8756d61c-8c78-4864-8e3d-f18610d3fc4a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonEquityTierOneCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_01449050-1ec9-424a-ac04-ad535f794d47" xlink:to="loc_us-gaap_CommonEquityTierOneCapitalAbstract_8756d61c-8c78-4864-8e3d-f18610d3fc4a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonEquityTierOneCapital_46c0544e-3c0f-4863-8d6d-9e38af309da1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonEquityTierOneCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommonEquityTierOneCapitalAbstract_8756d61c-8c78-4864-8e3d-f18610d3fc4a" xlink:to="loc_us-gaap_CommonEquityTierOneCapital_46c0544e-3c0f-4863-8d6d-9e38af309da1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonEquityTierOneCapitalRatio_e418e273-3341-406a-bf33-38c3c3b74184" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonEquityTierOneCapitalRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommonEquityTierOneCapitalAbstract_8756d61c-8c78-4864-8e3d-f18610d3fc4a" xlink:to="loc_us-gaap_CommonEquityTierOneCapitalRatio_e418e273-3341-406a-bf33-38c3c3b74184" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonEquityTierOneCapitalRequiredForCapitalAdequacy_cdd0beac-1bbb-42a9-a593-3fb244206802" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonEquityTierOneCapitalRequiredForCapitalAdequacy"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommonEquityTierOneCapitalAbstract_8756d61c-8c78-4864-8e3d-f18610d3fc4a" xlink:to="loc_us-gaap_CommonEquityTierOneCapitalRequiredForCapitalAdequacy_cdd0beac-1bbb-42a9-a593-3fb244206802" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum_b9bcc467-e2e4-48fe-b94f-434ead2111fd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommonEquityTierOneCapitalAbstract_8756d61c-8c78-4864-8e3d-f18610d3fc4a" xlink:to="loc_us-gaap_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioCapitalAdequacyMinimum_b9bcc467-e2e4-48fe-b94f-434ead2111fd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonEquityTierOneCapitalRequiredToBeWellCapitalized_32437f4b-211e-44a4-a4d5-82e5ef1d49c1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonEquityTierOneCapitalRequiredToBeWellCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommonEquityTierOneCapitalAbstract_8756d61c-8c78-4864-8e3d-f18610d3fc4a" xlink:to="loc_us-gaap_CommonEquityTierOneCapitalRequiredToBeWellCapitalized_32437f4b-211e-44a4-a4d5-82e5ef1d49c1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum_e7286b42-a416-4b5a-b618-154e3d033448" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CommonEquityTierOneCapitalAbstract_8756d61c-8c78-4864-8e3d-f18610d3fc4a" xlink:to="loc_us-gaap_BankingRegulationCommonEquityTierOneRiskBasedCapitalRatioWellCapitalizedMinimum_e7286b42-a416-4b5a-b618-154e3d033448" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneLeverageCapitalAbstract_b8224ddc-bfbc-4d62-b73e-65c79a11b5d2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneLeverageCapitalAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems_01449050-1ec9-424a-ac04-ad535f794d47" xlink:to="loc_us-gaap_TierOneLeverageCapitalAbstract_b8224ddc-bfbc-4d62-b73e-65c79a11b5d2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneLeverageCapital_15696beb-c3b5-47d0-afca-af3df500dd09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneLeverageCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneLeverageCapitalAbstract_b8224ddc-bfbc-4d62-b73e-65c79a11b5d2" xlink:to="loc_us-gaap_TierOneLeverageCapital_15696beb-c3b5-47d0-afca-af3df500dd09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneLeverageCapitalToAverageAssets_6f8953a9-9683-4a3e-bd74-f1aa8a390348" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneLeverageCapitalToAverageAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneLeverageCapitalAbstract_b8224ddc-bfbc-4d62-b73e-65c79a11b5d2" xlink:to="loc_us-gaap_TierOneLeverageCapitalToAverageAssets_6f8953a9-9683-4a3e-bd74-f1aa8a390348" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy_1bc23e98-a703-43d5-8dce-9bcade27480c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneLeverageCapitalAbstract_b8224ddc-bfbc-4d62-b73e-65c79a11b5d2" xlink:to="loc_us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy_1bc23e98-a703-43d5-8dce-9bcade27480c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets_379cd973-f02d-4c62-88b1-57495b09577e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneLeverageCapitalAbstract_b8224ddc-bfbc-4d62-b73e-65c79a11b5d2" xlink:to="loc_us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets_379cd973-f02d-4c62-88b1-57495b09577e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized_59a97568-d6ed-4cf9-92f4-7becda851d2e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneLeverageCapitalAbstract_b8224ddc-bfbc-4d62-b73e-65c79a11b5d2" xlink:to="loc_us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized_59a97568-d6ed-4cf9-92f4-7becda851d2e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets_f91565cb-2eec-4827-8383-7c38288dcfce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TierOneLeverageCapitalAbstract_b8224ddc-bfbc-4d62-b73e-65c79a11b5d2" xlink:to="loc_us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets_f91565cb-2eec-4827-8383-7c38288dcfce" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/DerivativesScheduleofDerivativeInstrumentsinStatementofFinancialPositionFairValueDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#DerivativesScheduleofDerivativeInstrumentsinStatementofFinancialPositionFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/DerivativesScheduleofDerivativeInstrumentsinStatementofFinancialPositionFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_d6286d2a-c123-4db6-aa9b-29980300b890" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_0c2e5db3-9309-4e65-8b9e-133486084983" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_d6286d2a-c123-4db6-aa9b-29980300b890" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_0c2e5db3-9309-4e65-8b9e-133486084983" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_a44547d0-a548-4863-9095-b46a8ef1efe0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_0c2e5db3-9309-4e65-8b9e-133486084983" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_a44547d0-a548-4863-9095-b46a8ef1efe0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_a44547d0-a548-4863-9095-b46a8ef1efe0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_a44547d0-a548-4863-9095-b46a8ef1efe0" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_a44547d0-a548-4863-9095-b46a8ef1efe0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_cdc993b6-b596-43f9-a609-315a53050bce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_a44547d0-a548-4863-9095-b46a8ef1efe0" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_cdc993b6-b596-43f9-a609-315a53050bce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMember_8e8fcdf6-0a1b-4493-8d22-ea27cc9fb65a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_cdc993b6-b596-43f9-a609-315a53050bce" xlink:to="loc_us-gaap_OtherAssetsMember_8e8fcdf6-0a1b-4493-8d22-ea27cc9fb65a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesMember_72ad10d1-296e-459f-ac80-f420982f3547" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_cdc993b6-b596-43f9-a609-315a53050bce" xlink:to="loc_us-gaap_OtherLiabilitiesMember_72ad10d1-296e-459f-ac80-f420982f3547" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_6120d564-12e7-495c-ba10-d23b7440cf0a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_0c2e5db3-9309-4e65-8b9e-133486084983" xlink:to="loc_us-gaap_HedgingDesignationAxis_6120d564-12e7-495c-ba10-d23b7440cf0a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_6120d564-12e7-495c-ba10-d23b7440cf0a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_HedgingDesignationAxis_6120d564-12e7-495c-ba10-d23b7440cf0a" xlink:to="loc_us-gaap_HedgingDesignationDomain_6120d564-12e7-495c-ba10-d23b7440cf0a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_ba7b7645-8cae-4e5f-880b-91a73ae953a0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_HedgingDesignationAxis_6120d564-12e7-495c-ba10-d23b7440cf0a" xlink:to="loc_us-gaap_HedgingDesignationDomain_ba7b7645-8cae-4e5f-880b-91a73ae953a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_59e9b925-1e04-4d6b-bcd6-1241ce05c225" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_ba7b7645-8cae-4e5f-880b-91a73ae953a0" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_59e9b925-1e04-4d6b-bcd6-1241ce05c225" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_3cceae33-cc34-453d-8ac8-96e4979a3c44" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NondesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingDesignationDomain_ba7b7645-8cae-4e5f-880b-91a73ae953a0" xlink:to="loc_us-gaap_NondesignatedMember_3cceae33-cc34-453d-8ac8-96e4979a3c44" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_287e39a1-50e9-486b-8808-4eaec274c3f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_0c2e5db3-9309-4e65-8b9e-133486084983" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_287e39a1-50e9-486b-8808-4eaec274c3f9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_287e39a1-50e9-486b-8808-4eaec274c3f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_287e39a1-50e9-486b-8808-4eaec274c3f9" xlink:to="loc_us-gaap_HedgingRelationshipDomain_287e39a1-50e9-486b-8808-4eaec274c3f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_1100d0d2-6103-42c8-ae5b-b84ff753dc90" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_287e39a1-50e9-486b-8808-4eaec274c3f9" xlink:to="loc_us-gaap_HedgingRelationshipDomain_1100d0d2-6103-42c8-ae5b-b84ff753dc90" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_3f68ed6d-e5d8-433d-ab66-8540ae258226" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_HedgingRelationshipDomain_1100d0d2-6103-42c8-ae5b-b84ff753dc90" xlink:to="loc_us-gaap_CashFlowHedgingMember_3f68ed6d-e5d8-433d-ab66-8540ae258226" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_13837f38-22c1-46db-a024-88a87339d682" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_d6286d2a-c123-4db6-aa9b-29980300b890" xlink:to="loc_us-gaap_DerivativeNotionalAmount_13837f38-22c1-46db-a024-88a87339d682" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_e6460d14-305d-46b8-83f7-3b19a6fdd199" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_d6286d2a-c123-4db6-aa9b-29980300b890" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_e6460d14-305d-46b8-83f7-3b19a6fdd199" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_80cb2e41-04d7-4b61-ac3e-36ee09b5b591" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_d6286d2a-c123-4db6-aa9b-29980300b890" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_80cb2e41-04d7-4b61-ac3e-36ee09b5b591" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/DerivativesScheduleofAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#DerivativesScheduleofAccumulatedOtherComprehensiveIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/DerivativesScheduleofAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_483683e8-a747-4555-b094-bb4c8af6b727" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_3018f04e-e3f0-4de9-88d0-3322a2e6c156" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_483683e8-a747-4555-b094-bb4c8af6b727" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_3018f04e-e3f0-4de9-88d0-3322a2e6c156" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_8580e961-e566-452e-b228-45000c71c830" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_3018f04e-e3f0-4de9-88d0-3322a2e6c156" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_8580e961-e566-452e-b228-45000c71c830" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_8580e961-e566-452e-b228-45000c71c830_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_8580e961-e566-452e-b228-45000c71c830" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_8580e961-e566-452e-b228-45000c71c830_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_4fcd7c29-4485-4e60-9f82-8550e54b1c15" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_8580e961-e566-452e-b228-45000c71c830" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_4fcd7c29-4485-4e60-9f82-8550e54b1c15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_8b2f91d3-82b6-4775-8e5b-663a20633ce0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_4fcd7c29-4485-4e60-9f82-8550e54b1c15" xlink:to="loc_us-gaap_InterestRateSwapMember_8b2f91d3-82b6-4775-8e5b-663a20633ce0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_d64a3f11-ef30-4684-8878-2f9d187f034d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_3018f04e-e3f0-4de9-88d0-3322a2e6c156" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_d64a3f11-ef30-4684-8878-2f9d187f034d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_d64a3f11-ef30-4684-8878-2f9d187f034d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_d64a3f11-ef30-4684-8878-2f9d187f034d" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_d64a3f11-ef30-4684-8878-2f9d187f034d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_3899043a-f084-484e-8a69-c598b4e84ec3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_d64a3f11-ef30-4684-8878-2f9d187f034d" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_3899043a-f084-484e-8a69-c598b4e84ec3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeMember_e366f6c3-8db3-47fd-ab96-d75546c06edf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3899043a-f084-484e-8a69-c598b4e84ec3" xlink:to="loc_us-gaap_InterestIncomeMember_e366f6c3-8db3-47fd-ab96-d75546c06edf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseMember_cf6383c4-b231-41d1-b889-35c1759c2f12" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_3899043a-f084-484e-8a69-c598b4e84ec3" xlink:to="loc_us-gaap_InterestExpenseMember_cf6383c4-b231-41d1-b889-35c1759c2f12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_e2b74a64-2d8c-4cce-a32f-cd71659cfd9c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_483683e8-a747-4555-b094-bb4c8af6b727" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_e2b74a64-2d8c-4cce-a32f-cd71659cfd9c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_370dbfac-4366-4cc6-a3fa-85246db0d4c2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_483683e8-a747-4555-b094-bb4c8af6b727" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_370dbfac-4366-4cc6-a3fa-85246db0d4c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseBeforeAdjustmentsAndTax_84fc6d13-4c8c-4b5f-b3ce-ee4c0f29fe6e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseBeforeAdjustmentsAndTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_483683e8-a747-4555-b094-bb4c8af6b727" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseBeforeAdjustmentsAndTax_84fc6d13-4c8c-4b5f-b3ce-ee4c0f29fe6e" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/DerivativesScheduleofDerivativeInstrumentsDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#DerivativesScheduleofDerivativeInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/DerivativesScheduleofDerivativeInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_1ed38b7a-cbe6-440e-bff3-2986e45cd05f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_ce780852-b342-426f-828b-712e61a09791" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_1ed38b7a-cbe6-440e-bff3-2986e45cd05f" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_ce780852-b342-426f-828b-712e61a09791" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_8a542002-41e1-475b-a0bb-9023077ea09d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_ce780852-b342-426f-828b-712e61a09791" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_8a542002-41e1-475b-a0bb-9023077ea09d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_8a542002-41e1-475b-a0bb-9023077ea09d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_8a542002-41e1-475b-a0bb-9023077ea09d" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_8a542002-41e1-475b-a0bb-9023077ea09d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_a545ff76-8f1f-49d5-8cac-65df45519644" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_8a542002-41e1-475b-a0bb-9023077ea09d" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_a545ff76-8f1f-49d5-8cac-65df45519644" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeMember_5f16168d-e7e1-4172-8eef-0c9092bc7c59" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_a545ff76-8f1f-49d5-8cac-65df45519644" xlink:to="loc_us-gaap_InterestIncomeMember_5f16168d-e7e1-4172-8eef-0c9092bc7c59" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseMember_8a2452ce-1e53-455e-8755-bddc38c01650" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_a545ff76-8f1f-49d5-8cac-65df45519644" xlink:to="loc_us-gaap_InterestExpenseMember_8a2452ce-1e53-455e-8755-bddc38c01650" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_32095478-63bc-4c70-874d-2749a46b42d6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresTable_ce780852-b342-426f-828b-712e61a09791" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_32095478-63bc-4c70-874d-2749a46b42d6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_32095478-63bc-4c70-874d-2749a46b42d6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_32095478-63bc-4c70-874d-2749a46b42d6" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_32095478-63bc-4c70-874d-2749a46b42d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_eb3035e8-142c-4578-83bf-006f257ae328" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_32095478-63bc-4c70-874d-2749a46b42d6" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_eb3035e8-142c-4578-83bf-006f257ae328" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_39c0adc3-1faa-4b7d-8032-a142bc52faf9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_eb3035e8-142c-4578-83bf-006f257ae328" xlink:to="loc_us-gaap_InterestRateSwapMember_39c0adc3-1faa-4b7d-8032-a142bc52faf9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_74463fe9-e12c-446e-a881-3d14c82b23f4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_1ed38b7a-cbe6-440e-bff3-2986e45cd05f" xlink:to="loc_us-gaap_GainLossOnFairValueHedgesRecognizedInEarnings_74463fe9-e12c-446e-a881-3d14c82b23f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_2f8d055b-a50b-4d24-9b9d-b337af39726c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_1ed38b7a-cbe6-440e-bff3-2986e45cd05f" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnHedgedItemInFairValueHedge1_2f8d055b-a50b-4d24-9b9d-b337af39726c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_84aefbe9-0a7e-4b3e-ad8f-25f7d830a9ae" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_1ed38b7a-cbe6-440e-bff3-2986e45cd05f" xlink:to="loc_us-gaap_ChangeInUnrealizedGainLossOnFairValueHedgingInstruments1_84aefbe9-0a7e-4b3e-ad8f-25f7d830a9ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_bab45775-cef2-4e54-a31d-d8b5787cb204" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_1ed38b7a-cbe6-440e-bff3-2986e45cd05f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationBeforeTax_bab45775-cef2-4e54-a31d-d8b5787cb204" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax_aaf64fde-3a92-402b-bff8-1b7841c562cf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosuresLineItems_1ed38b7a-cbe6-440e-bff3-2986e45cd05f" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossDerivativeExcludedComponentIncreaseDecreaseAdjustmentsBeforeTax_aaf64fde-3a92-402b-bff8-1b7841c562cf" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/CommitmentsandContingenciesScheduleofContractualAmountsofCompanysFinancialInstrumentsOutstandingDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#CommitmentsandContingenciesScheduleofContractualAmountsofCompanysFinancialInstrumentsOutstandingDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/CommitmentsandContingenciesScheduleofContractualAmountsofCompanysFinancialInstrumentsOutstandingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems_4f342ba1-46b3-44a7-acb7-93c1628ee685" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable_bfad5c95-bd91-4ec5-8b12-29dc9d2da4ea" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems_4f342ba1-46b3-44a7-acb7-93c1628ee685" xlink:to="loc_us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable_bfad5c95-bd91-4ec5-8b12-29dc9d2da4ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_3aff11e4-4a19-41a7-b079-802c7b954b14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFairValueOffBalanceSheetRisksTable_bfad5c95-bd91-4ec5-8b12-29dc9d2da4ea" xlink:to="loc_us-gaap_FinancialInstrumentAxis_3aff11e4-4a19-41a7-b079-802c7b954b14" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3aff11e4-4a19-41a7-b079-802c7b954b14_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_3aff11e4-4a19-41a7-b079-802c7b954b14" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3aff11e4-4a19-41a7-b079-802c7b954b14_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_938c3c25-a12b-4310-90e1-a405eabaa0ee" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_3aff11e4-4a19-41a7-b079-802c7b954b14" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_938c3c25-a12b-4310-90e1-a405eabaa0ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnusedLinesOfCreditMember_19eebac1-fd58-4017-a7d2-de3e07741756" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnusedLinesOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_938c3c25-a12b-4310-90e1-a405eabaa0ee" xlink:to="loc_us-gaap_UnusedLinesOfCreditMember_19eebac1-fd58-4017-a7d2-de3e07741756" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LetterOfCreditMember_659f7a21-b270-4ff4-9593-0c7a4ee74d6c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LetterOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_938c3c25-a12b-4310-90e1-a405eabaa0ee" xlink:to="loc_us-gaap_LetterOfCreditMember_659f7a21-b270-4ff4-9593-0c7a4ee74d6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability_1d67c938-dd95-4cba-97d1-8e5f629492d9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueOffBalanceSheetRisksDisclosureInformationLineItems_4f342ba1-46b3-44a7-acb7-93c1628ee685" xlink:to="loc_us-gaap_FairValueDisclosureOffbalanceSheetRisksFaceAmountLiability_1d67c938-dd95-4cba-97d1-8e5f629492d9" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#CommitmentsandContingenciesNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/CommitmentsandContingenciesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesFairValueLineItems_866dead9-2e0b-4a27-861e-492801ddc689" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativesFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_8a760318-d512-448e-b4e8-48ea115a59c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_866dead9-2e0b-4a27-861e-492801ddc689" xlink:to="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_8a760318-d512-448e-b4e8-48ea115a59c9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_3711486c-23cb-4f8a-a008-47ba019a50c5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValuesDerivativesBalanceSheetLocationByDerivativeContractTypeByHedgingDesignationTable_8a760318-d512-448e-b4e8-48ea115a59c9" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_3711486c-23cb-4f8a-a008-47ba019a50c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_3711486c-23cb-4f8a-a008-47ba019a50c5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_3711486c-23cb-4f8a-a008-47ba019a50c5" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_3711486c-23cb-4f8a-a008-47ba019a50c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_f9122c60-4364-4f53-a433-54bfdb7d7656" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis_3711486c-23cb-4f8a-a008-47ba019a50c5" xlink:to="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_f9122c60-4364-4f53-a433-54bfdb7d7656" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnfundedLoanCommitmentMember_3609a927-d53f-451e-8ae4-dd35c0aed730" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_UnfundedLoanCommitmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancingReceivableRecordedInvestmentClassOfFinancingReceivableDomain_f9122c60-4364-4f53-a433-54bfdb7d7656" xlink:to="loc_us-gaap_UnfundedLoanCommitmentMember_3609a927-d53f-451e-8ae4-dd35c0aed730" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal_6da12796-04d6-4236-8857-f9255b450242" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_866dead9-2e0b-4a27-861e-492801ddc689" xlink:to="loc_us-gaap_OffBalanceSheetCreditLossLiabilityCreditLossExpenseReversal_6da12796-04d6-4236-8857-f9255b450242" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OffBalanceSheetCreditLossLiability_f197f037-3bf6-46a7-82f4-4018cbaf4970" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OffBalanceSheetCreditLossLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativesFairValueLineItems_866dead9-2e0b-4a27-861e-492801ddc689" xlink:to="loc_us-gaap_OffBalanceSheetCreditLossLiability_f197f037-3bf6-46a7-82f4-4018cbaf4970" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/FairValueMeasurementsScheduleofFairValueAssetsandLiabilitiesRecurringDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#FairValueMeasurementsScheduleofFairValueAssetsandLiabilitiesRecurringDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/FairValueMeasurementsScheduleofFairValueAssetsandLiabilitiesRecurringDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_465ae1c2-0ec7-44f9-9805-99fe0e778617" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c5afa60f-2b46-4385-85f2-27303f74cd4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_465ae1c2-0ec7-44f9-9805-99fe0e778617" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c5afa60f-2b46-4385-85f2-27303f74cd4e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_c0e19af8-0ec4-4bf3-a682-7092c96a71be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c5afa60f-2b46-4385-85f2-27303f74cd4e" xlink:to="loc_us-gaap_FinancialInstrumentAxis_c0e19af8-0ec4-4bf3-a682-7092c96a71be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_c0e19af8-0ec4-4bf3-a682-7092c96a71be_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_c0e19af8-0ec4-4bf3-a682-7092c96a71be" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_c0e19af8-0ec4-4bf3-a682-7092c96a71be_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3ea04d3a-657c-400f-bc9e-d988d2806f70" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_c0e19af8-0ec4-4bf3-a682-7092c96a71be" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3ea04d3a-657c-400f-bc9e-d988d2806f70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USTreasuryAndGovernmentMember_798f6755-ad3b-4e4b-b76f-a006d0a1f783" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USTreasuryAndGovernmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3ea04d3a-657c-400f-bc9e-d988d2806f70" xlink:to="loc_us-gaap_USTreasuryAndGovernmentMember_798f6755-ad3b-4e4b-b76f-a006d0a1f783" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_0f809fb9-e1dc-4d11-85b2-32b344e6d195" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_USStatesAndPoliticalSubdivisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3ea04d3a-657c-400f-bc9e-d988d2806f70" xlink:to="loc_us-gaap_USStatesAndPoliticalSubdivisionsMember_0f809fb9-e1dc-4d11-85b2-32b344e6d195" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ResidentialMortgageBackedSecuritiesAgencyMember_315c320e-aaad-4fbb-b070-3e684390efa5" xlink:href="bhrb-20250630.xsd#bhrb_ResidentialMortgageBackedSecuritiesAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3ea04d3a-657c-400f-bc9e-d988d2806f70" xlink:to="loc_bhrb_ResidentialMortgageBackedSecuritiesAgencyMember_315c320e-aaad-4fbb-b070-3e684390efa5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember_f8ec8c6f-efad-4b73-95e3-50d1c64f89db" xlink:href="bhrb-20250630.xsd#bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3ea04d3a-657c-400f-bc9e-d988d2806f70" xlink:to="loc_bhrb_ResidentialMortgageBackedSecuritiesNonAgencyMember_f8ec8c6f-efad-4b73-95e3-50d1c64f89db" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_CommercialMortgageBackedSecuritiesAgencyMember_f543156c-8866-4fd8-a59e-75b654b7282a" xlink:href="bhrb-20250630.xsd#bhrb_CommercialMortgageBackedSecuritiesAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3ea04d3a-657c-400f-bc9e-d988d2806f70" xlink:to="loc_bhrb_CommercialMortgageBackedSecuritiesAgencyMember_f543156c-8866-4fd8-a59e-75b654b7282a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember_05403501-9c1e-44a4-9201-31177d7c8c76" xlink:href="bhrb-20250630.xsd#bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3ea04d3a-657c-400f-bc9e-d988d2806f70" xlink:to="loc_bhrb_CommercialMortgageBackedSecuritiesNonAgencyMember_05403501-9c1e-44a4-9201-31177d7c8c76" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_dca4fdc3-7aa9-4578-912a-3f9f37fe0664" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3ea04d3a-657c-400f-bc9e-d988d2806f70" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_dca4fdc3-7aa9-4578-912a-3f9f37fe0664" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherDebtSecuritiesMember_fa673c2b-788d-4367-b7a3-6fa02d0e6ee6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherDebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_3ea04d3a-657c-400f-bc9e-d988d2806f70" xlink:to="loc_us-gaap_OtherDebtSecuritiesMember_fa673c2b-788d-4367-b7a3-6fa02d0e6ee6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_09035918-9e79-427c-9abb-aeed8996c673" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c5afa60f-2b46-4385-85f2-27303f74cd4e" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_09035918-9e79-427c-9abb-aeed8996c673" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_09035918-9e79-427c-9abb-aeed8996c673_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_09035918-9e79-427c-9abb-aeed8996c673" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_09035918-9e79-427c-9abb-aeed8996c673_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_117ec113-2307-43cd-9dd0-f7f5e11769d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_09035918-9e79-427c-9abb-aeed8996c673" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_117ec113-2307-43cd-9dd0-f7f5e11769d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_c5682448-759c-4e1a-a0df-3c9b419dc236" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_117ec113-2307-43cd-9dd0-f7f5e11769d8" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_c5682448-759c-4e1a-a0df-3c9b419dc236" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_9381eb76-6e05-4ddc-a126-74d9bac8941c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_117ec113-2307-43cd-9dd0-f7f5e11769d8" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_9381eb76-6e05-4ddc-a126-74d9bac8941c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_28dd5051-590e-4033-ac5b-268edadd475c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_117ec113-2307-43cd-9dd0-f7f5e11769d8" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_28dd5051-590e-4033-ac5b-268edadd475c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_e8d40bbe-b763-4ff2-82a2-e3de0ad05186" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_c5afa60f-2b46-4385-85f2-27303f74cd4e" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_e8d40bbe-b763-4ff2-82a2-e3de0ad05186" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_e8d40bbe-b763-4ff2-82a2-e3de0ad05186_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_e8d40bbe-b763-4ff2-82a2-e3de0ad05186" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_e8d40bbe-b763-4ff2-82a2-e3de0ad05186_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_12d94e0f-46e6-4090-ad9d-7a9d1917a34f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_e8d40bbe-b763-4ff2-82a2-e3de0ad05186" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_12d94e0f-46e6-4090-ad9d-7a9d1917a34f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_e3605d64-360e-4068-a3b5-220223e84d16" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_12d94e0f-46e6-4090-ad9d-7a9d1917a34f" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_e3605d64-360e-4068-a3b5-220223e84d16" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_d5505a31-5214-4499-9f82-0b9e5d8d52b7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_465ae1c2-0ec7-44f9-9805-99fe0e778617" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_d5505a31-5214-4499-9f82-0b9e5d8d52b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_81089d2b-8d4d-44fe-82ca-e4ab9ae598c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_d5505a31-5214-4499-9f82-0b9e5d8d52b7" xlink:to="loc_us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest_81089d2b-8d4d-44fe-82ca-e4ab9ae598c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_29c8498a-7bc8-4f20-a492-1d3e2984fc42" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansHeldForSaleFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_d5505a31-5214-4499-9f82-0b9e5d8d52b7" xlink:to="loc_us-gaap_LoansHeldForSaleFairValueDisclosure_29c8498a-7bc8-4f20-a492-1d3e2984fc42" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_3cb4f617-3fdb-409e-94bc-1b02bfde59ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityMethodInvestmentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_d5505a31-5214-4499-9f82-0b9e5d8d52b7" xlink:to="loc_us-gaap_EquityMethodInvestmentsFairValueDisclosure_3cb4f617-3fdb-409e-94bc-1b02bfde59ad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_d01c9af4-22a9-4944-95d9-b786ba204e7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_d5505a31-5214-4499-9f82-0b9e5d8d52b7" xlink:to="loc_us-gaap_DerivativeAssets_d01c9af4-22a9-4944-95d9-b786ba204e7b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_9192fdca-3777-4ac8-bb33-0448bbdf635d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_465ae1c2-0ec7-44f9-9805-99fe0e778617" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_9192fdca-3777-4ac8-bb33-0448bbdf635d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_8e700241-a26e-46a7-8682-5fdfdffda747" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_9192fdca-3777-4ac8-bb33-0448bbdf635d" xlink:to="loc_us-gaap_DerivativeLiabilities_8e700241-a26e-46a7-8682-5fdfdffda747" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/FairValueMeasurementsScheduleofFairValueAssetsandLiabilitiesNonrecurringDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#FairValueMeasurementsScheduleofFairValueAssetsandLiabilitiesNonrecurringDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/FairValueMeasurementsScheduleofFairValueAssetsandLiabilitiesNonrecurringDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_9a7c9f0e-390f-441e-a957-a4b48e8a0be6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_211552ef-166b-43f8-8673-5f1eed248ecc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_9a7c9f0e-390f-441e-a957-a4b48e8a0be6" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_211552ef-166b-43f8-8673-5f1eed248ecc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_044d9203-32d0-4aef-8a26-97f50cfcde83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_211552ef-166b-43f8-8673-5f1eed248ecc" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_044d9203-32d0-4aef-8a26-97f50cfcde83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_044d9203-32d0-4aef-8a26-97f50cfcde83_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_044d9203-32d0-4aef-8a26-97f50cfcde83" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_044d9203-32d0-4aef-8a26-97f50cfcde83_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_70c544b3-535a-4641-9c80-32c161930d3f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_044d9203-32d0-4aef-8a26-97f50cfcde83" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_70c544b3-535a-4641-9c80-32c161930d3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_7d92710d-c0c6-4670-a6a3-600800106d1e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_70c544b3-535a-4641-9c80-32c161930d3f" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_7d92710d-c0c6-4670-a6a3-600800106d1e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_b7f62b07-33e1-404d-b6fe-e83b223ca625" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_70c544b3-535a-4641-9c80-32c161930d3f" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_b7f62b07-33e1-404d-b6fe-e83b223ca625" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_e71170a1-ca9b-44f6-94bf-ca7b2a6f7aa8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_70c544b3-535a-4641-9c80-32c161930d3f" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_e71170a1-ca9b-44f6-94bf-ca7b2a6f7aa8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_2db1bdfe-2af8-45a6-b055-738cb3d98bc1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_211552ef-166b-43f8-8673-5f1eed248ecc" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_2db1bdfe-2af8-45a6-b055-738cb3d98bc1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_2db1bdfe-2af8-45a6-b055-738cb3d98bc1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_2db1bdfe-2af8-45a6-b055-738cb3d98bc1" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_2db1bdfe-2af8-45a6-b055-738cb3d98bc1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_854c0c87-a5ca-4589-a3e0-fa6dc4968104" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_2db1bdfe-2af8-45a6-b055-738cb3d98bc1" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_854c0c87-a5ca-4589-a3e0-fa6dc4968104" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_81adb0d5-16fe-45c9-841c-4097f1684f30" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsNonrecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_854c0c87-a5ca-4589-a3e0-fa6dc4968104" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_81adb0d5-16fe-45c9-841c-4097f1684f30" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_e31fb20d-c45e-434e-a964-a2397084d66c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_211552ef-166b-43f8-8673-5f1eed248ecc" xlink:to="loc_us-gaap_FinancialInstrumentAxis_e31fb20d-c45e-434e-a964-a2397084d66c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e31fb20d-c45e-434e-a964-a2397084d66c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_e31fb20d-c45e-434e-a964-a2397084d66c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e31fb20d-c45e-434e-a964-a2397084d66c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_fe8cb437-31e0-4a1c-9165-7354187b4542" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_e31fb20d-c45e-434e-a964-a2397084d66c" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_fe8cb437-31e0-4a1c-9165-7354187b4542" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_e9942d8b-3f71-4345-8ed5-aa0f95e89757" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialRealEstatePortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_fe8cb437-31e0-4a1c-9165-7354187b4542" xlink:to="loc_us-gaap_CommercialRealEstatePortfolioSegmentMember_e9942d8b-3f71-4345-8ed5-aa0f95e89757" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_OwnerOccupiedCommercialRealEstateMember_4d4d66ec-44d7-4b76-a3c3-7e9be11732ec" xlink:href="bhrb-20250630.xsd#bhrb_OwnerOccupiedCommercialRealEstateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_fe8cb437-31e0-4a1c-9165-7354187b4542" xlink:to="loc_bhrb_OwnerOccupiedCommercialRealEstateMember_4d4d66ec-44d7-4b76-a3c3-7e9be11732ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_AcquisitionConstructionAndDevelopmentMember_ea9d37dc-c068-4edb-b4a0-433062c69261" xlink:href="bhrb-20250630.xsd#bhrb_AcquisitionConstructionAndDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_fe8cb437-31e0-4a1c-9165-7354187b4542" xlink:to="loc_bhrb_AcquisitionConstructionAndDevelopmentMember_ea9d37dc-c068-4edb-b4a0-433062c69261" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPortfolioSegmentMember_19032c3d-2616-4121-91e6-bb0a5d0a5123" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommercialPortfolioSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_fe8cb437-31e0-4a1c-9165-7354187b4542" xlink:to="loc_us-gaap_CommercialPortfolioSegmentMember_19032c3d-2616-4121-91e6-bb0a5d0a5123" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_OneToFourFamilyResidentialLoansMember_ba3b0d95-5974-4914-b6de-d8296d72b8f4" xlink:href="bhrb-20250630.xsd#bhrb_OneToFourFamilyResidentialLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_fe8cb437-31e0-4a1c-9165-7354187b4542" xlink:to="loc_bhrb_OneToFourFamilyResidentialLoansMember_ba3b0d95-5974-4914-b6de-d8296d72b8f4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ConsumerNonRealEstateAndOtherMember_ca6d5d04-d27a-4f2a-8ec0-e57cd7ab6f72" xlink:href="bhrb-20250630.xsd#bhrb_ConsumerNonRealEstateAndOtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_fe8cb437-31e0-4a1c-9165-7354187b4542" xlink:to="loc_bhrb_ConsumerNonRealEstateAndOtherMember_ca6d5d04-d27a-4f2a-8ec0-e57cd7ab6f72" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_aefc49d4-75dd-4524-ba22-a652043b484e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_9a7c9f0e-390f-441e-a957-a4b48e8a0be6" xlink:to="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_aefc49d4-75dd-4524-ba22-a652043b484e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRealEstate_03271f87-9139-4939-bcba-58e35271e432" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_9a7c9f0e-390f-441e-a957-a4b48e8a0be6" xlink:to="loc_us-gaap_OtherRealEstate_03271f87-9139-4939-bcba-58e35271e432" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/FairValueMeasurementsScheduleofFairValueMeasurementInputsandValuationTechniquesDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#FairValueMeasurementsScheduleofFairValueMeasurementInputsandValuationTechniquesDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/FairValueMeasurementsScheduleofFairValueMeasurementInputsandValuationTechniquesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_b95a8f15-94bc-4863-b1ee-ad6f4c03163e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_35699184-90d1-4c3c-a90b-67c0cd253690" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_b95a8f15-94bc-4863-b1ee-ad6f4c03163e" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_35699184-90d1-4c3c-a90b-67c0cd253690" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_352b0f45-95ca-4aae-8a0d-6495b099aef2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_35699184-90d1-4c3c-a90b-67c0cd253690" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_352b0f45-95ca-4aae-8a0d-6495b099aef2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_352b0f45-95ca-4aae-8a0d-6495b099aef2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_352b0f45-95ca-4aae-8a0d-6495b099aef2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_352b0f45-95ca-4aae-8a0d-6495b099aef2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e5e5f1cc-7e78-42af-9240-8f88f8231c34" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_352b0f45-95ca-4aae-8a0d-6495b099aef2" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e5e5f1cc-7e78-42af-9240-8f88f8231c34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_c14707ba-c19b-4523-a27a-654bc0907b82" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e5e5f1cc-7e78-42af-9240-8f88f8231c34" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_c14707ba-c19b-4523-a27a-654bc0907b82" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_e2a7f4b6-f19c-4660-9aa8-cdb14dea9c25" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_35699184-90d1-4c3c-a90b-67c0cd253690" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_e2a7f4b6-f19c-4660-9aa8-cdb14dea9c25" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_e2a7f4b6-f19c-4660-9aa8-cdb14dea9c25_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_e2a7f4b6-f19c-4660-9aa8-cdb14dea9c25" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_e2a7f4b6-f19c-4660-9aa8-cdb14dea9c25_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_e94226a5-5ab1-4a05-9e6d-8a3bc55a162a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_e2a7f4b6-f19c-4660-9aa8-cdb14dea9c25" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_e94226a5-5ab1-4a05-9e6d-8a3bc55a162a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsNonrecurringMember_3f5b6169-f377-4214-bb6e-34905661134f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsNonrecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_e94226a5-5ab1-4a05-9e6d-8a3bc55a162a" xlink:to="loc_us-gaap_FairValueMeasurementsNonrecurringMember_3f5b6169-f377-4214-bb6e-34905661134f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_57209c15-3234-4d91-8aac-279b45e04ddf" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_35699184-90d1-4c3c-a90b-67c0cd253690" xlink:to="loc_srt_RangeAxis_57209c15-3234-4d91-8aac-279b45e04ddf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_57209c15-3234-4d91-8aac-279b45e04ddf_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_57209c15-3234-4d91-8aac-279b45e04ddf" xlink:to="loc_srt_RangeMember_57209c15-3234-4d91-8aac-279b45e04ddf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_43a50eba-698a-4c9b-9724-3828ab854ed1" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_57209c15-3234-4d91-8aac-279b45e04ddf" xlink:to="loc_srt_RangeMember_43a50eba-698a-4c9b-9724-3828ab854ed1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_7fd72b08-fbc2-45ca-b19c-884ec707d9b2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_43a50eba-698a-4c9b-9724-3828ab854ed1" xlink:to="loc_srt_MinimumMember_7fd72b08-fbc2-45ca-b19c-884ec707d9b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_7a4bcd2e-a810-44e1-abee-e84920eb8173" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_43a50eba-698a-4c9b-9724-3828ab854ed1" xlink:to="loc_srt_MaximumMember_7a4bcd2e-a810-44e1-abee-e84920eb8173" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueAxis_df35c353-5ea0-4bb6-9e2b-0d5bc5528a4f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesTable_35699184-90d1-4c3c-a90b-67c0cd253690" xlink:to="loc_us-gaap_ValuationTechniqueAxis_df35c353-5ea0-4bb6-9e2b-0d5bc5528a4f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_df35c353-5ea0-4bb6-9e2b-0d5bc5528a4f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ValuationTechniqueAxis_df35c353-5ea0-4bb6-9e2b-0d5bc5528a4f" xlink:to="loc_us-gaap_ValuationTechniqueDomain_df35c353-5ea0-4bb6-9e2b-0d5bc5528a4f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationTechniqueDomain_55e1d4b2-fc6a-4636-8ca0-70b7ad506192" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ValuationTechniqueDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ValuationTechniqueAxis_df35c353-5ea0-4bb6-9e2b-0d5bc5528a4f" xlink:to="loc_us-gaap_ValuationTechniqueDomain_55e1d4b2-fc6a-4636-8ca0-70b7ad506192" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ValuationTechniqueAppraisalOfCollateralMember_5f46f20a-4bba-43de-8f3e-0208c4b6907f" xlink:href="bhrb-20250630.xsd#bhrb_ValuationTechniqueAppraisalOfCollateralMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ValuationTechniqueDomain_55e1d4b2-fc6a-4636-8ca0-70b7ad506192" xlink:to="loc_bhrb_ValuationTechniqueAppraisalOfCollateralMember_5f46f20a-4bba-43de-8f3e-0208c4b6907f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ValuationTechniqueAppraisalOfCollateralForLiquidityMember_08b6f159-464e-4f3c-8af0-0db5db8e784b" xlink:href="bhrb-20250630.xsd#bhrb_ValuationTechniqueAppraisalOfCollateralForLiquidityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bhrb_ValuationTechniqueAppraisalOfCollateralMember_5f46f20a-4bba-43de-8f3e-0208c4b6907f" xlink:to="loc_bhrb_ValuationTechniqueAppraisalOfCollateralForLiquidityMember_08b6f159-464e-4f3c-8af0-0db5db8e784b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ValuationTechniqueAppraisalOfCollateralForSellingCostsMember_ea3dcd99-4765-4357-a7b9-2a595ef22a37" xlink:href="bhrb-20250630.xsd#bhrb_ValuationTechniqueAppraisalOfCollateralForSellingCostsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bhrb_ValuationTechniqueAppraisalOfCollateralMember_5f46f20a-4bba-43de-8f3e-0208c4b6907f" xlink:to="loc_bhrb_ValuationTechniqueAppraisalOfCollateralForSellingCostsMember_ea3dcd99-4765-4357-a7b9-2a595ef22a37" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_c0b52c36-6d2f-4f34-8876-8c5c731be4e3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_b95a8f15-94bc-4863-b1ee-ad6f4c03163e" xlink:to="loc_us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment_c0b52c36-6d2f-4f34-8876-8c5c731be4e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRealEstate_c30f6e4a-40aa-451f-8ad0-52958077df24" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherRealEstate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_b95a8f15-94bc-4863-b1ee-ad6f4c03163e" xlink:to="loc_us-gaap_OtherRealEstate_c30f6e4a-40aa-451f-8ad0-52958077df24" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_FinancingReceivableIndividuallyEvaluatedForImpairmentMeasurementInput_20d7fed6-479f-4b5a-8431-cfdcb3fbaa3f" xlink:href="bhrb-20250630.xsd#bhrb_FinancingReceivableIndividuallyEvaluatedForImpairmentMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_b95a8f15-94bc-4863-b1ee-ad6f4c03163e" xlink:to="loc_bhrb_FinancingReceivableIndividuallyEvaluatedForImpairmentMeasurementInput_20d7fed6-479f-4b5a-8431-cfdcb3fbaa3f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherRealEstateOwnedMeasurementInput_f0a965a5-7b79-4e0f-9239-a450d82ffb01" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OtherRealEstateOwnedMeasurementInput"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisValuationTechniquesLineItems_b95a8f15-94bc-4863-b1ee-ad6f4c03163e" xlink:to="loc_us-gaap_OtherRealEstateOwnedMeasurementInput_f0a965a5-7b79-4e0f-9239-a450d82ffb01" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/FairValueMeasurementsScheduleofFairValueDisclosureofAssetandLiabilitynotMeasuredatFairValueDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#FairValueMeasurementsScheduleofFairValueDisclosureofAssetandLiabilitynotMeasuredatFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/FairValueMeasurementsScheduleofFairValueDisclosureofAssetandLiabilitynotMeasuredatFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_314cd332-c95c-4768-be69-45a0c385cd2f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_6c05267f-3f1f-4ec6-a275-63ea1501b001" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_314cd332-c95c-4768-be69-45a0c385cd2f" xlink:to="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_6c05267f-3f1f-4ec6-a275-63ea1501b001" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_9dbcc7e7-eb9b-4ced-92eb-45e04eca85f9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_6c05267f-3f1f-4ec6-a275-63ea1501b001" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_9dbcc7e7-eb9b-4ced-92eb-45e04eca85f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_9dbcc7e7-eb9b-4ced-92eb-45e04eca85f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_9dbcc7e7-eb9b-4ced-92eb-45e04eca85f9" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_9dbcc7e7-eb9b-4ced-92eb-45e04eca85f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_20972fe4-6278-425f-9895-8faf1abe46b0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_9dbcc7e7-eb9b-4ced-92eb-45e04eca85f9" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_20972fe4-6278-425f-9895-8faf1abe46b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_992d9d36-170d-406d-a9c3-17f1fa020f48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_20972fe4-6278-425f-9895-8faf1abe46b0" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_992d9d36-170d-406d-a9c3-17f1fa020f48" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_ddb9c29e-81f2-4b0a-9496-459472b49b4d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_20972fe4-6278-425f-9895-8faf1abe46b0" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_ddb9c29e-81f2-4b0a-9496-459472b49b4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_ec585900-0231-437c-bdf8-c4ca6e6c34dc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_20972fe4-6278-425f-9895-8faf1abe46b0" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_ec585900-0231-437c-bdf8-c4ca6e6c34dc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_54dfd22d-be9e-45f9-a443-6ed15fab6773" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_6c05267f-3f1f-4ec6-a275-63ea1501b001" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_54dfd22d-be9e-45f9-a443-6ed15fab6773" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_54dfd22d-be9e-45f9-a443-6ed15fab6773_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_54dfd22d-be9e-45f9-a443-6ed15fab6773" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_54dfd22d-be9e-45f9-a443-6ed15fab6773_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_601e89d2-d12b-484c-83db-27775a7e3bb9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_54dfd22d-be9e-45f9-a443-6ed15fab6773" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_601e89d2-d12b-484c-83db-27775a7e3bb9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_e69f14a8-7b4b-4baa-8dd0-b19cf7f236ec" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_601e89d2-d12b-484c-83db-27775a7e3bb9" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_e69f14a8-7b4b-4baa-8dd0-b19cf7f236ec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_98ce424b-0dd7-4ead-be40-1e4c6d21cd7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_e69f14a8-7b4b-4baa-8dd0-b19cf7f236ec" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_98ce424b-0dd7-4ead-be40-1e4c6d21cd7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_d9f3eb13-a96e-4afe-b40f-1bcf97558fb1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_e69f14a8-7b4b-4baa-8dd0-b19cf7f236ec" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_d9f3eb13-a96e-4afe-b40f-1bcf97558fb1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAxis_09fb5e53-a669-41b9-8b77-91eb69190e7c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_6c05267f-3f1f-4ec6-a275-63ea1501b001" xlink:to="loc_us-gaap_CashAndCashEquivalentsAxis_09fb5e53-a669-41b9-8b77-91eb69190e7c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_09fb5e53-a669-41b9-8b77-91eb69190e7c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_09fb5e53-a669-41b9-8b77-91eb69190e7c" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_09fb5e53-a669-41b9-8b77-91eb69190e7c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_eebddfb2-3651-4e35-b100-52e5c7b4c64b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CashAndCashEquivalentsAxis_09fb5e53-a669-41b9-8b77-91eb69190e7c" xlink:to="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_eebddfb2-3651-4e35-b100-52e5c7b4c64b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BankTimeDepositsMember_9bfd7eb3-0b74-4aff-a115-462d7efb9d41" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BankTimeDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestrictedCashAndCashEquivalentsCashAndCashEquivalentsMember_eebddfb2-3651-4e35-b100-52e5c7b4c64b" xlink:to="loc_us-gaap_BankTimeDepositsMember_9bfd7eb3-0b74-4aff-a115-462d7efb9d41" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_06fd3767-8725-457f-b6de-b652daaf5009" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueDisclosureOfAssetAndLiabilityNotMeasuredAtFairValueTable_6c05267f-3f1f-4ec6-a275-63ea1501b001" xlink:to="loc_us-gaap_FinancialInstrumentAxis_06fd3767-8725-457f-b6de-b652daaf5009" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_06fd3767-8725-457f-b6de-b652daaf5009_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FinancialInstrumentAxis_06fd3767-8725-457f-b6de-b652daaf5009" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_06fd3767-8725-457f-b6de-b652daaf5009_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e2ab9104-9d0c-461f-ad10-68a804f3d601" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FinancialInstrumentAxis_06fd3767-8725-457f-b6de-b652daaf5009" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e2ab9104-9d0c-461f-ad10-68a804f3d601" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_NonInterestBearingMember_1c49cb74-9bee-42cf-a99c-a0ac2f6a51ff" xlink:href="bhrb-20250630.xsd#bhrb_NonInterestBearingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e2ab9104-9d0c-461f-ad10-68a804f3d601" xlink:to="loc_bhrb_NonInterestBearingMember_1c49cb74-9bee-42cf-a99c-a0ac2f6a51ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestBearingDepositsMember_2cc30857-0a29-41ba-a1c9-5554805f950d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestBearingDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_e2ab9104-9d0c-461f-ad10-68a804f3d601" xlink:to="loc_us-gaap_InterestBearingDepositsMember_2cc30857-0a29-41ba-a1c9-5554805f950d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_798c74b3-e354-4d62-94e8-1c3a7aca76ce" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_314cd332-c95c-4768-be69-45a0c385cd2f" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_798c74b3-e354-4d62-94e8-1c3a7aca76ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndDueFromBanks_d1fd4036-c856-4958-81aa-0bab742de447" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndDueFromBanks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_798c74b3-e354-4d62-94e8-1c3a7aca76ce" xlink:to="loc_us-gaap_CashAndDueFromBanks_d1fd4036-c856-4958-81aa-0bab742de447" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_275c9f41-94f9-4513-bfe8-723c62f915c7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_798c74b3-e354-4d62-94e8-1c3a7aca76ce" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_275c9f41-94f9-4513-bfe8-723c62f915c7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LoansReceivableFairValueDisclosure_d1eca634-7f96-477f-a7a3-7740e10eecaa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_LoansReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_798c74b3-e354-4d62-94e8-1c3a7aca76ce" xlink:to="loc_us-gaap_LoansReceivableFairValueDisclosure_d1eca634-7f96-477f-a7a3-7740e10eecaa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_AccruedInterestReceivableFairValueDisclosure_be4dd648-605a-4c9f-a567-c369ffb3a585" xlink:href="bhrb-20250630.xsd#bhrb_AccruedInterestReceivableFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialAssetsBalanceSheetGroupingsAbstract_798c74b3-e354-4d62-94e8-1c3a7aca76ce" xlink:to="loc_bhrb_AccruedInterestReceivableFairValueDisclosure_be4dd648-605a-4c9f-a567-c369ffb3a585" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_37eaf477-5241-43bd-a34a-9d891f8fa4d7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureAssetAndLiabilityNotMeasuredAtFairValueLineItems_314cd332-c95c-4768-be69-45a0c385cd2f" xlink:to="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_37eaf477-5241-43bd-a34a-9d891f8fa4d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DepositsFairValueDisclosure_bd299513-33ca-4790-a5fd-9e568066237b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DepositsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_37eaf477-5241-43bd-a34a-9d891f8fa4d7" xlink:to="loc_us-gaap_DepositsFairValueDisclosure_bd299513-33ca-4790-a5fd-9e568066237b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShortTermDebtAndOtherBorrowingsFairValueDisclosure_929e3b6b-faa2-42b5-8b51-fc7d5aac8e92" xlink:href="bhrb-20250630.xsd#bhrb_ShortTermDebtAndOtherBorrowingsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_37eaf477-5241-43bd-a34a-9d891f8fa4d7" xlink:to="loc_bhrb_ShortTermDebtAndOtherBorrowingsFairValueDisclosure_929e3b6b-faa2-42b5-8b51-fc7d5aac8e92" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubordinatedDebt_b4931958-6b65-4e5d-ade7-b0d16a2ba508" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SubordinatedDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_37eaf477-5241-43bd-a34a-9d891f8fa4d7" xlink:to="loc_us-gaap_SubordinatedDebt_b4931958-6b65-4e5d-ade7-b0d16a2ba508" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust_2db5ab3e-e581-44da-ae96-d9707fa72a14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_37eaf477-5241-43bd-a34a-9d891f8fa4d7" xlink:to="loc_us-gaap_JuniorSubordinatedDebentureOwedToUnconsolidatedSubsidiaryTrust_2db5ab3e-e581-44da-ae96-d9707fa72a14" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_InterestPayableAndOtherLiabilitiesFairValueDisclosure_680aa1b8-5afe-487c-b745-dfeb06a246f1" xlink:href="bhrb-20250630.xsd#bhrb_InterestPayableAndOtherLiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FinancialInstrumentsFinancialLiabilitiesBalanceSheetGroupingsAbstract_37eaf477-5241-43bd-a34a-9d891f8fa4d7" xlink:to="loc_bhrb_InterestPayableAndOtherLiabilitiesFairValueDisclosure_680aa1b8-5afe-487c-b745-dfeb06a246f1" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#AccumulatedOtherComprehensiveIncomeLossScheduleofAccumulatedOtherComprehensiveIncomeLossDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofAccumulatedOtherComprehensiveIncomeLossDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_c6c06668-d14f-4297-b69a-31a5492d3ff3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_284d20af-2ece-47b8-bbaf-5840ed979524" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_c6c06668-d14f-4297-b69a-31a5492d3ff3" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_284d20af-2ece-47b8-bbaf-5840ed979524" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_f4bdcaed-5522-4683-8e8f-71334bc37567" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_284d20af-2ece-47b8-bbaf-5840ed979524" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_f4bdcaed-5522-4683-8e8f-71334bc37567" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_f4bdcaed-5522-4683-8e8f-71334bc37567_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_f4bdcaed-5522-4683-8e8f-71334bc37567" xlink:to="loc_us-gaap_EquityComponentDomain_f4bdcaed-5522-4683-8e8f-71334bc37567_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_5bf2aa31-4781-44aa-b120-b233f1a0e6aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_f4bdcaed-5522-4683-8e8f-71334bc37567" xlink:to="loc_us-gaap_EquityComponentDomain_5bf2aa31-4781-44aa-b120-b233f1a0e6aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6a06db34-75ea-4437-970b-cf8228920e35" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_5bf2aa31-4781-44aa-b120-b233f1a0e6aa" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6a06db34-75ea-4437-970b-cf8228920e35" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_ae580366-7454-4b65-947a-1ea3db84c22b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6a06db34-75ea-4437-970b-cf8228920e35" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_ae580366-7454-4b65-947a-1ea3db84c22b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_6e26c8bf-84c3-438b-8668-facef8c547bc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6a06db34-75ea-4437-970b-cf8228920e35" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_6e26c8bf-84c3-438b-8668-facef8c547bc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_8503929f-8d65-4824-af1c-455a69c8adb7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_6a06db34-75ea-4437-970b-cf8228920e35" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_8503929f-8d65-4824-af1c-455a69c8adb7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7530a63c-b639-402a-8369-61852e4faa4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AOCIAttributableToParentNetOfTaxRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_c6c06668-d14f-4297-b69a-31a5492d3ff3" xlink:to="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7530a63c-b639-402a-8369-61852e4faa4e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_8e1e1ef2-ba5d-45ca-9347-e89ed77f147d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7530a63c-b639-402a-8369-61852e4faa4e" xlink:to="loc_us-gaap_StockholdersEquity_8e1e1ef2-ba5d-45ca-9347-e89ed77f147d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_f0f94ba4-78e9-453c-b679-abc0fa216765" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7530a63c-b639-402a-8369-61852e4faa4e" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_f0f94ba4-78e9-453c-b679-abc0fa216765" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_dd2661a9-fda3-46dd-976a-9e11225bce1d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AOCIAttributableToParentNetOfTaxRollForward_7530a63c-b639-402a-8369-61852e4faa4e" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_dd2661a9-fda3-46dd-976a-9e11225bce1d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_18d5c042-0e00-4b12-aab7-9087ad1ea529" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockholdersEquity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofReclassificationoutofAccumulatedOtherComprehensiveIncomeDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#AccumulatedOtherComprehensiveIncomeLossScheduleofReclassificationoutofAccumulatedOtherComprehensiveIncomeDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/AccumulatedOtherComprehensiveIncomeLossScheduleofReclassificationoutofAccumulatedOtherComprehensiveIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_e6abace4-1884-410e-9919-5f6f41c046e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_bc23f014-c2c9-4d22-bf46-a7b93a26466b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_e6abace4-1884-410e-9919-5f6f41c046e5" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_bc23f014-c2c9-4d22-bf46-a7b93a26466b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_5d0edf3a-b5e0-4d31-87df-59860f4dc605" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_bc23f014-c2c9-4d22-bf46-a7b93a26466b" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_5d0edf3a-b5e0-4d31-87df-59860f4dc605" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_5d0edf3a-b5e0-4d31-87df-59860f4dc605_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_5d0edf3a-b5e0-4d31-87df-59860f4dc605" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_5d0edf3a-b5e0-4d31-87df-59860f4dc605_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_fbd53fb8-00c4-459b-bdb4-6fbcca197734" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeAxis_5d0edf3a-b5e0-4d31-87df-59860f4dc605" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_fbd53fb8-00c4-459b-bdb4-6fbcca197734" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_2024d4ea-dfb3-41a1-a592-dbba85650b11" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeDomain_fbd53fb8-00c4-459b-bdb4-6fbcca197734" xlink:to="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeMember_2024d4ea-dfb3-41a1-a592-dbba85650b11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_fbe7fade-a3a0-4416-873e-f10e463d8d8d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ReclassificationOutOfAccumulatedOtherComprehensiveIncomeTable_bc23f014-c2c9-4d22-bf46-a7b93a26466b" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_fbe7fade-a3a0-4416-873e-f10e463d8d8d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_fbe7fade-a3a0-4416-873e-f10e463d8d8d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_fbe7fade-a3a0-4416-873e-f10e463d8d8d" xlink:to="loc_us-gaap_EquityComponentDomain_fbe7fade-a3a0-4416-873e-f10e463d8d8d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_1bf5bf28-3c3b-4305-84b8-97141aa29e09" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_fbe7fade-a3a0-4416-873e-f10e463d8d8d" xlink:to="loc_us-gaap_EquityComponentDomain_1bf5bf28-3c3b-4305-84b8-97141aa29e09" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_eb3dd27e-51c8-42b8-a241-d91067eac51c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1bf5bf28-3c3b-4305-84b8-97141aa29e09" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_eb3dd27e-51c8-42b8-a241-d91067eac51c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_5cfb18b5-2b46-46a0-92cc-76f2d6c8c824" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1bf5bf28-3c3b-4305-84b8-97141aa29e09" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_5cfb18b5-2b46-46a0-92cc-76f2d6c8c824" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_f82cc566-7025-4b3b-98d4-cc3d0d4d805b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_1bf5bf28-3c3b-4305-84b8-97141aa29e09" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_f82cc566-7025-4b3b-98d4-cc3d0d4d805b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestIncomeOperating_99b9b098-c2ac-4490-b1c4-342be41b9219" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestIncomeOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_e6abace4-1884-410e-9919-5f6f41c046e5" xlink:to="loc_us-gaap_InterestIncomeOperating_99b9b098-c2ac-4490-b1c4-342be41b9219" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseOperating_b1558652-3899-4d05-814c-3edb3661e048" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InterestExpenseOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_e6abace4-1884-410e-9919-5f6f41c046e5" xlink:to="loc_us-gaap_InterestExpenseOperating_b1558652-3899-4d05-814c-3edb3661e048" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtAndEquitySecuritiesGainLoss_4388001d-9e03-4f89-b75f-8c439cabcadc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_DebtAndEquitySecuritiesGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_e6abace4-1884-410e-9919-5f6f41c046e5" xlink:to="loc_us-gaap_DebtAndEquitySecuritiesGainLoss_4388001d-9e03-4f89-b75f-8c439cabcadc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeBenefitsAndShareBasedCompensation_2815d5b7-6227-47fc-b64c-0194307992f1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeBenefitsAndShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_e6abace4-1884-410e-9919-5f6f41c046e5" xlink:to="loc_us-gaap_EmployeeBenefitsAndShareBasedCompensation_2815d5b7-6227-47fc-b64c-0194307992f1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_47bd6e25-4b5b-4871-8e5a-198a00c11fcd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_e6abace4-1884-410e-9919-5f6f41c046e5" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_47bd6e25-4b5b-4871-8e5a-198a00c11fcd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_27d7ddd0-1b59-4e56-9f24-860e88795174" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ReclassificationAdjustmentOutOfAccumulatedOtherComprehensiveIncomeLineItems_e6abace4-1884-410e-9919-5f6f41c046e5" xlink:to="loc_us-gaap_NetIncomeLoss_27d7ddd0-1b59-4e56-9f24-860e88795174" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/ShareBasedCompensationNarrativeDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#ShareBasedCompensationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/ShareBasedCompensationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_850c76f4-920c-4f80-bcff-053eb2f91bbc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_850c76f4-920c-4f80-bcff-053eb2f91bbc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_f85d0ba5-9b3f-482c-9117-8911693d306b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_850c76f4-920c-4f80-bcff-053eb2f91bbc" xlink:to="loc_us-gaap_AwardTypeAxis_f85d0ba5-9b3f-482c-9117-8911693d306b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f85d0ba5-9b3f-482c-9117-8911693d306b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_f85d0ba5-9b3f-482c-9117-8911693d306b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f85d0ba5-9b3f-482c-9117-8911693d306b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_487fc78f-6d20-48c1-b4f2-9ce4de7e471d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_f85d0ba5-9b3f-482c-9117-8911693d306b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_487fc78f-6d20-48c1-b4f2-9ce4de7e471d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_96358aca-892a-4229-b7ce-b10e2c52d575" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_487fc78f-6d20-48c1-b4f2-9ce4de7e471d" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_96358aca-892a-4229-b7ce-b10e2c52d575" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_PerformanceBasedRestrictedStockUnitsMember_896d8361-70a3-418a-b601-2ba5883e5b35" xlink:href="bhrb-20250630.xsd#bhrb_PerformanceBasedRestrictedStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_487fc78f-6d20-48c1-b4f2-9ce4de7e471d" xlink:to="loc_bhrb_PerformanceBasedRestrictedStockUnitsMember_896d8361-70a3-418a-b601-2ba5883e5b35" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_b0dcfce4-543e-49c9-8240-5a843c203828" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_487fc78f-6d20-48c1-b4f2-9ce4de7e471d" xlink:to="loc_us-gaap_EmployeeStockMember_b0dcfce4-543e-49c9-8240-5a843c203828" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_1bb169fc-91b8-4739-a464-ac3aeb626b1a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_487fc78f-6d20-48c1-b4f2-9ce4de7e471d" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_1bb169fc-91b8-4739-a464-ac3aeb626b1a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_90786648-e5d9-4d90-b582-40f70c3bda86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_850c76f4-920c-4f80-bcff-053eb2f91bbc" xlink:to="loc_us-gaap_PlanNameAxis_90786648-e5d9-4d90-b582-40f70c3bda86" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_90786648-e5d9-4d90-b582-40f70c3bda86_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_90786648-e5d9-4d90-b582-40f70c3bda86" xlink:to="loc_us-gaap_PlanNameDomain_90786648-e5d9-4d90-b582-40f70c3bda86_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_4c43c42c-9fcf-4a94-bd4d-3b34e3e76de9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_90786648-e5d9-4d90-b582-40f70c3bda86" xlink:to="loc_us-gaap_PlanNameDomain_4c43c42c-9fcf-4a94-bd4d-3b34e3e76de9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_A2019StockIncentivePlanMember_3fe58c67-2788-4e7f-90e7-9fd4d309af9e" xlink:href="bhrb-20250630.xsd#bhrb_A2019StockIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_4c43c42c-9fcf-4a94-bd4d-3b34e3e76de9" xlink:to="loc_bhrb_A2019StockIncentivePlanMember_3fe58c67-2788-4e7f-90e7-9fd4d309af9e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_A2023StockIncentivePlanMember_08fc1842-0cb9-4681-a3a3-6e2e9f9dfd58" xlink:href="bhrb-20250630.xsd#bhrb_A2023StockIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_4c43c42c-9fcf-4a94-bd4d-3b34e3e76de9" xlink:to="loc_bhrb_A2023StockIncentivePlanMember_08fc1842-0cb9-4681-a3a3-6e2e9f9dfd58" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_A2023EmployeeStockPurchasePlanMember_91daf7a9-2f2c-4587-b8d1-c6a5680dfbcf" xlink:href="bhrb-20250630.xsd#bhrb_A2023EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_4c43c42c-9fcf-4a94-bd4d-3b34e3e76de9" xlink:to="loc_bhrb_A2023EmployeeStockPurchasePlanMember_91daf7a9-2f2c-4587-b8d1-c6a5680dfbcf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_5818b0a2-3c78-4a37-88a6-58ce3620efcc" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_850c76f4-920c-4f80-bcff-053eb2f91bbc" xlink:to="loc_srt_RangeAxis_5818b0a2-3c78-4a37-88a6-58ce3620efcc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_5818b0a2-3c78-4a37-88a6-58ce3620efcc_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_5818b0a2-3c78-4a37-88a6-58ce3620efcc" xlink:to="loc_srt_RangeMember_5818b0a2-3c78-4a37-88a6-58ce3620efcc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_6f4aa502-4202-42e1-b1c9-586835546f5d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_5818b0a2-3c78-4a37-88a6-58ce3620efcc" xlink:to="loc_srt_RangeMember_6f4aa502-4202-42e1-b1c9-586835546f5d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_a18ed1b8-d3a2-48f4-890d-33d403c469aa" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_6f4aa502-4202-42e1-b1c9-586835546f5d" xlink:to="loc_srt_MinimumMember_a18ed1b8-d3a2-48f4-890d-33d403c469aa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_b2bf0ee9-8d3c-4501-a4ab-676b451378bd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_6f4aa502-4202-42e1-b1c9-586835546f5d" xlink:to="loc_srt_MaximumMember_b2bf0ee9-8d3c-4501-a4ab-676b451378bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_789748bd-00f5-421a-aea8-72bcd5710c4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_850c76f4-920c-4f80-bcff-053eb2f91bbc" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_789748bd-00f5-421a-aea8-72bcd5710c4e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_789748bd-00f5-421a-aea8-72bcd5710c4e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_789748bd-00f5-421a-aea8-72bcd5710c4e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_789748bd-00f5-421a-aea8-72bcd5710c4e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e3da2cf6-7321-435f-bc55-7bb1fee6d4c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_789748bd-00f5-421a-aea8-72bcd5710c4e" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e3da2cf6-7321-435f-bc55-7bb1fee6d4c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SummitFinancialGroupIncMember_de758dc3-08fd-4ec1-8610-31c9249f6431" xlink:href="bhrb-20250630.xsd#bhrb_SummitFinancialGroupIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e3da2cf6-7321-435f-bc55-7bb1fee6d4c9" xlink:to="loc_bhrb_SummitFinancialGroupIncMember_de758dc3-08fd-4ec1-8610-31c9249f6431" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_8e4ffa56-f696-4652-ae0c-058e93806d14" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_8e4ffa56-f696-4652-ae0c-058e93806d14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_4ebea5b1-84ce-4f32-8c5b-0fae431fc631" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_4ebea5b1-84ce-4f32-8c5b-0fae431fc631" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_fa37cab8-e88b-4056-8053-82aee1a2a77b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_fa37cab8-e88b-4056-8053-82aee1a2a77b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardRightToReceiveCommonShare_634e2536-904b-4a16-885b-c504dfe79940" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardRightToReceiveCommonShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardRightToReceiveCommonShare_634e2536-904b-4a16-885b-c504dfe79940" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_723b7ea1-7caa-41c6-b9df-818fea7bc991" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod_723b7ea1-7caa-41c6-b9df-818fea7bc991" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_bde6dce8-2f68-43a5-8056-4eb4d211e33e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_bde6dce8-2f68-43a5-8056-4eb4d211e33e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_aa8eebdc-3890-4bfd-9a74-55cf7e409341" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage_aa8eebdc-3890-4bfd-9a74-55cf7e409341" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_5c0022c5-cb57-4f1d-a976-828846460e72" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions_5c0022c5-cb57-4f1d-a976-828846460e72" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_83e5694d-f355-4169-bae6-fb0bbb5bb37d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_83e5694d-f355-4169-bae6-fb0bbb5bb37d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_7d87da8b-ddcd-4076-b6f1-ace7783168e5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CommonStockCapitalSharesReservedForFutureIssuance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_us-gaap_CommonStockCapitalSharesReservedForFutureIssuance_7d87da8b-ddcd-4076-b6f1-ace7783168e5" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_e2111fa8-4c01-499d-a56d-e4bd542a3742" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_e2111fa8-4c01-499d-a56d-e4bd542a3742" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_af62b2f0-5344-4298-ad16-3779771dcfe1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_af62b2f0-5344-4298-ad16-3779771dcfe1" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_85eb225d-edbc-4c77-80de-4f2ae3fdb5b5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_85eb225d-edbc-4c77-80de-4f2ae3fdb5b5" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationConsiderationTransferredExchangeRatio_3b6b60fc-131e-4408-8462-17314aafc377" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationConsiderationTransferredExchangeRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_bhrb_BusinessCombinationConsiderationTransferredExchangeRatio_3b6b60fc-131e-4408-8462-17314aafc377" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualAwardVestingRightsPercentage_434efd77-a8ca-4272-8d88-2367be66a294" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualAwardVestingRightsPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardAnnualAwardVestingRightsPercentage_434efd77-a8ca-4272-8d88-2367be66a294" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_34fd638c-7f86-4ce0-aa89-26bbe9de5236" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_34fd638c-7f86-4ce0-aa89-26bbe9de5236" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodFairValue_285a4959-f001-48ad-9563-f38a8d263c51" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsExercisedInPeriodFairValue_285a4959-f001-48ad-9563-f38a8d263c51" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVested_9b48d22d-fe6c-451d-b214-d7854b4ebe77" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVested"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_43635312-586d-47ca-aa47-fa328c6b8666" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsVested_9b48d22d-fe6c-451d-b214-d7854b4ebe77" xlink:type="arc" order="17"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/ShareBasedCompensationScheduleofShareBasedPaymentArrangementRestrictedStockandRestrictedStockUnitActivityDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#ShareBasedCompensationScheduleofShareBasedPaymentArrangementRestrictedStockandRestrictedStockUnitActivityDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/ShareBasedCompensationScheduleofShareBasedPaymentArrangementRestrictedStockandRestrictedStockUnitActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_338bf124-f886-4e04-bd0e-84c16248afc7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c72375f4-763c-4d8c-a1f5-d326e74aa0df" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_338bf124-f886-4e04-bd0e-84c16248afc7" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c72375f4-763c-4d8c-a1f5-d326e74aa0df" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_60821cd3-f3fa-4e0e-9b8e-b1533d76f851" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c72375f4-763c-4d8c-a1f5-d326e74aa0df" xlink:to="loc_us-gaap_AwardTypeAxis_60821cd3-f3fa-4e0e-9b8e-b1533d76f851" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_60821cd3-f3fa-4e0e-9b8e-b1533d76f851_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_60821cd3-f3fa-4e0e-9b8e-b1533d76f851" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_60821cd3-f3fa-4e0e-9b8e-b1533d76f851_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_53ee2362-aa3a-4c84-9008-ee076fda08a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_60821cd3-f3fa-4e0e-9b8e-b1533d76f851" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_53ee2362-aa3a-4c84-9008-ee076fda08a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_a3e792d2-438d-4220-b503-932e1c9ccabf" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_53ee2362-aa3a-4c84-9008-ee076fda08a6" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_a3e792d2-438d-4220-b503-932e1c9ccabf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_ab7a0d8c-8864-4dc2-a7a1-fb6fb22322a6" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_338bf124-f886-4e04-bd0e-84c16248afc7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_ab7a0d8c-8864-4dc2-a7a1-fb6fb22322a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_1ada3ee3-2c99-4a41-b4ad-657d94942bfc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_ab7a0d8c-8864-4dc2-a7a1-fb6fb22322a6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_1ada3ee3-2c99-4a41-b4ad-657d94942bfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_d4a678b4-fe51-49f1-9fa3-73dd08d170d8" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_ab7a0d8c-8864-4dc2-a7a1-fb6fb22322a6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_d4a678b4-fe51-49f1-9fa3-73dd08d170d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_dbb528eb-bb4b-46dd-b8cb-9652de868425" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_ab7a0d8c-8864-4dc2-a7a1-fb6fb22322a6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_dbb528eb-bb4b-46dd-b8cb-9652de868425" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_4a513a87-2937-46d7-a015-29225dc719c3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_ab7a0d8c-8864-4dc2-a7a1-fb6fb22322a6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_4a513a87-2937-46d7-a015-29225dc719c3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_d37bd699-8340-4633-a4f1-df2b9dbac332" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_ed58a7bc-c93d-432e-97a7-a7cbec0a0cad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_338bf124-f886-4e04-bd0e-84c16248afc7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_ed58a7bc-c93d-432e-97a7-a7cbec0a0cad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_e464118c-2d46-44db-9e62-3115671b6926" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_ed58a7bc-c93d-432e-97a7-a7cbec0a0cad" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_e464118c-2d46-44db-9e62-3115671b6926" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_17055ac3-645b-48a2-b3db-44877abbc824" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_ed58a7bc-c93d-432e-97a7-a7cbec0a0cad" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_17055ac3-645b-48a2-b3db-44877abbc824" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_85c8bfb1-4a1d-4f97-a494-5f36ca643a83" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_ed58a7bc-c93d-432e-97a7-a7cbec0a0cad" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_85c8bfb1-4a1d-4f97-a494-5f36ca643a83" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_43063433-d780-491e-8e31-a8635490fb17" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_ed58a7bc-c93d-432e-97a7-a7cbec0a0cad" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_43063433-d780-491e-8e31-a8635490fb17" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_c3053c9d-38aa-4a43-be7f-7519fff36c64" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/ShareBasedCompensationScheduleofEmployeeStockPurchasePlanDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#ShareBasedCompensationScheduleofEmployeeStockPurchasePlanDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/ShareBasedCompensationScheduleofEmployeeStockPurchasePlanDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ad083d8a-dc2f-4818-a17c-948c3673ef71" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_83c69084-7756-4802-b3c9-0e214581435a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ad083d8a-dc2f-4818-a17c-948c3673ef71" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_83c69084-7756-4802-b3c9-0e214581435a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_ca2d36cc-3c91-4bca-8c39-8494d62657a7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_83c69084-7756-4802-b3c9-0e214581435a" xlink:to="loc_us-gaap_AwardTypeAxis_ca2d36cc-3c91-4bca-8c39-8494d62657a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ca2d36cc-3c91-4bca-8c39-8494d62657a7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_ca2d36cc-3c91-4bca-8c39-8494d62657a7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ca2d36cc-3c91-4bca-8c39-8494d62657a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0f477486-1bc5-4ad0-bd32-c1500707ed9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_ca2d36cc-3c91-4bca-8c39-8494d62657a7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0f477486-1bc5-4ad0-bd32-c1500707ed9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_6c6e65fb-eff9-4a4d-9033-d8b2395ec0a9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0f477486-1bc5-4ad0-bd32-c1500707ed9f" xlink:to="loc_us-gaap_EmployeeStockMember_6c6e65fb-eff9-4a4d-9033-d8b2395ec0a9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_e1585c6e-304d-4132-80a1-ee7df036da28" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_83c69084-7756-4802-b3c9-0e214581435a" xlink:to="loc_us-gaap_PlanNameAxis_e1585c6e-304d-4132-80a1-ee7df036da28" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_e1585c6e-304d-4132-80a1-ee7df036da28_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_e1585c6e-304d-4132-80a1-ee7df036da28" xlink:to="loc_us-gaap_PlanNameDomain_e1585c6e-304d-4132-80a1-ee7df036da28_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_b6f6b3d0-3b22-4905-9c60-06752e9af2ff" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_e1585c6e-304d-4132-80a1-ee7df036da28" xlink:to="loc_us-gaap_PlanNameDomain_b6f6b3d0-3b22-4905-9c60-06752e9af2ff" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_A2023EmployeeStockPurchasePlanMember_f2f7320c-0451-4b5a-8d0a-7461db79475d" xlink:href="bhrb-20250630.xsd#bhrb_A2023EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_b6f6b3d0-3b22-4905-9c60-06752e9af2ff" xlink:to="loc_bhrb_A2023EmployeeStockPurchasePlanMember_f2f7320c-0451-4b5a-8d0a-7461db79475d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_fcbdfa90-f34e-4e04-939f-632ee7915fd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ad083d8a-dc2f-4818-a17c-948c3673ef71" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_fcbdfa90-f34e-4e04-939f-632ee7915fd2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased_7b37905f-18a1-4c8f-a88f-5d2b49dd0407" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ad083d8a-dc2f-4818-a17c-948c3673ef71" xlink:to="loc_us-gaap_EmployeeStockOwnershipPlanESOPWeightedAveragePurchasePriceOfSharesPurchased_7b37905f-18a1-4c8f-a88f-5d2b49dd0407" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_a7e0157b-d703-451a-8edf-dab3a8e92bbd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_ad083d8a-dc2f-4818-a17c-948c3673ef71" xlink:to="loc_us-gaap_ShareBasedCompensation_a7e0157b-d703-451a-8edf-dab3a8e92bbd" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/ShareBasedCompensationScheduleofShareBasedPaymentAwardEmployeeStockPurchasePlanValuationAssumptionsDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#ShareBasedCompensationScheduleofShareBasedPaymentAwardEmployeeStockPurchasePlanValuationAssumptionsDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/ShareBasedCompensationScheduleofShareBasedPaymentAwardEmployeeStockPurchasePlanValuationAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07fff61e-8c00-4bd7-89a0-31fe89a6d042" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_edde93be-5f51-446b-84a6-6527d365aa89" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07fff61e-8c00-4bd7-89a0-31fe89a6d042" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_edde93be-5f51-446b-84a6-6527d365aa89" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_c2cb2ae1-401d-4463-a1f5-df9bfb28fbe7" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_edde93be-5f51-446b-84a6-6527d365aa89" xlink:to="loc_us-gaap_AwardTypeAxis_c2cb2ae1-401d-4463-a1f5-df9bfb28fbe7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c2cb2ae1-401d-4463-a1f5-df9bfb28fbe7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_c2cb2ae1-401d-4463-a1f5-df9bfb28fbe7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c2cb2ae1-401d-4463-a1f5-df9bfb28fbe7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2e670074-2216-4f46-a44b-cafa7f860920" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_c2cb2ae1-401d-4463-a1f5-df9bfb28fbe7" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2e670074-2216-4f46-a44b-cafa7f860920" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_a90b0e47-f826-4c0f-85ef-ae0d835d41fc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_2e670074-2216-4f46-a44b-cafa7f860920" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_a90b0e47-f826-4c0f-85ef-ae0d835d41fc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_a05e4dd9-93a5-4c5d-97d7-04acf2835de3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_edde93be-5f51-446b-84a6-6527d365aa89" xlink:to="loc_us-gaap_PlanNameAxis_a05e4dd9-93a5-4c5d-97d7-04acf2835de3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_a05e4dd9-93a5-4c5d-97d7-04acf2835de3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_a05e4dd9-93a5-4c5d-97d7-04acf2835de3" xlink:to="loc_us-gaap_PlanNameDomain_a05e4dd9-93a5-4c5d-97d7-04acf2835de3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_ae1bfd84-6cb5-482e-9b37-8339e2096163" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_a05e4dd9-93a5-4c5d-97d7-04acf2835de3" xlink:to="loc_us-gaap_PlanNameDomain_ae1bfd84-6cb5-482e-9b37-8339e2096163" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SAR2019PlanMember_de8fdf9b-139d-44ea-8c10-8a891a47c6a5" xlink:href="bhrb-20250630.xsd#bhrb_SAR2019PlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_ae1bfd84-6cb5-482e-9b37-8339e2096163" xlink:to="loc_bhrb_SAR2019PlanMember_de8fdf9b-139d-44ea-8c10-8a891a47c6a5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SAR2021PlanMember_4696875e-3302-4993-849c-67fb2243cf9f" xlink:href="bhrb-20250630.xsd#bhrb_SAR2021PlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_ae1bfd84-6cb5-482e-9b37-8339e2096163" xlink:to="loc_bhrb_SAR2021PlanMember_4696875e-3302-4993-849c-67fb2243cf9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SAR2023PlanMember_1d6032cd-8f15-4513-87f8-92b6a42778e8" xlink:href="bhrb-20250630.xsd#bhrb_SAR2023PlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_ae1bfd84-6cb5-482e-9b37-8339e2096163" xlink:to="loc_bhrb_SAR2023PlanMember_1d6032cd-8f15-4513-87f8-92b6a42778e8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_fc9fa6c5-61ad-4b06-a0ff-6b499fc07026" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07fff61e-8c00-4bd7-89a0-31fe89a6d042" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_fc9fa6c5-61ad-4b06-a0ff-6b499fc07026" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_50a19812-c0a5-4998-98ce-ad60c42cabe9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07fff61e-8c00-4bd7-89a0-31fe89a6d042" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_50a19812-c0a5-4998-98ce-ad60c42cabe9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_32d713ab-270e-415c-acb2-9465ed65a752" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07fff61e-8c00-4bd7-89a0-31fe89a6d042" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_32d713ab-270e-415c-acb2-9465ed65a752" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_fb4cfae3-abc8-4362-a4a8-ab9bf0813785" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07fff61e-8c00-4bd7-89a0-31fe89a6d042" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_fb4cfae3-abc8-4362-a4a8-ab9bf0813785" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_1da63b96-d17c-42d4-ae99-4aba426fc607" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07fff61e-8c00-4bd7-89a0-31fe89a6d042" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsWeightedAverageVolatilityRate_1da63b96-d17c-42d4-ae99-4aba426fc607" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_12857182-cd87-4623-8b56-7499877b5b86" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_07fff61e-8c00-4bd7-89a0-31fe89a6d042" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_12857182-cd87-4623-8b56-7499877b5b86" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/ShareBasedCompensationScheduleofStockAppreciationRightsandOptionActivityDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#ShareBasedCompensationScheduleofStockAppreciationRightsandOptionActivityDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/ShareBasedCompensationScheduleofStockAppreciationRightsandOptionActivityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_423275cd-107f-48fd-ba51-c50ae18fd125" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_e50fd1e8-3b4b-4029-9ab7-776243bdd949" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_423275cd-107f-48fd-ba51-c50ae18fd125" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_e50fd1e8-3b4b-4029-9ab7-776243bdd949" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_ec030bda-024b-4829-aa14-2e357d53584c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_e50fd1e8-3b4b-4029-9ab7-776243bdd949" xlink:to="loc_us-gaap_AwardTypeAxis_ec030bda-024b-4829-aa14-2e357d53584c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ec030bda-024b-4829-aa14-2e357d53584c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_ec030bda-024b-4829-aa14-2e357d53584c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ec030bda-024b-4829-aa14-2e357d53584c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0475aa4b-c5fa-447c-ba7c-4c8729671133" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_ec030bda-024b-4829-aa14-2e357d53584c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0475aa4b-c5fa-447c-ba7c-4c8729671133" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockAppreciationRightsSARSMember_5d062fa3-6614-4e71-8ba0-8c5e98ecda73" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_StockAppreciationRightsSARSMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0475aa4b-c5fa-447c-ba7c-4c8729671133" xlink:to="loc_us-gaap_StockAppreciationRightsSARSMember_5d062fa3-6614-4e71-8ba0-8c5e98ecda73" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_7ceda301-5077-472e-9c55-de887d3f921e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_423275cd-107f-48fd-ba51-c50ae18fd125" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_7ceda301-5077-472e-9c55-de887d3f921e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_0f7a87e9-da01-4301-a285-c115e48b8c20" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_7ceda301-5077-472e-9c55-de887d3f921e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_0f7a87e9-da01-4301-a285-c115e48b8c20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_753059e9-806e-4fba-93dd-3a19d3d3944e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_7ceda301-5077-472e-9c55-de887d3f921e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsGranted_753059e9-806e-4fba-93dd-3a19d3d3944e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_ec79c2a9-6820-401d-ba4d-d48134d15239" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_7ceda301-5077-472e-9c55-de887d3f921e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercised_ec79c2a9-6820-401d-ba4d-d48134d15239" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures_fd999e09-1364-4bd3-8dbc-3e600c89b1a1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_7ceda301-5077-472e-9c55-de887d3f921e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsForfeitures_fd999e09-1364-4bd3-8dbc-3e600c89b1a1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirations_79d8616f-2794-4c0b-93cf-c94c6667274f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingRollForward_7ceda301-5077-472e-9c55-de887d3f921e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExpirations_79d8616f-2794-4c0b-93cf-c94c6667274f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber_75da0a0d-fc10-4bb8-8718-1d742bea1b07" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsOutstandingNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisable_9f247b9d-457e-415d-8afe-1f03477e1917" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_423275cd-107f-48fd-ba51-c50ae18fd125" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionEquityInstrumentsExercisable_9f247b9d-457e-415d-8afe-1f03477e1917" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_f7993e66-16ef-46f3-9b10-3840b1fffc3d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_423275cd-107f-48fd-ba51-c50ae18fd125" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_f7993e66-16ef-46f3-9b10-3840b1fffc3d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_dbc44975-9b1e-4171-add4-c9c5b4a4acd5" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_f7993e66-16ef-46f3-9b10-3840b1fffc3d" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_dbc44975-9b1e-4171-add4-c9c5b4a4acd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueGranted_ae8904fe-9a45-4bb2-b866-423e243ec4c9" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueGranted"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_f7993e66-16ef-46f3-9b10-3840b1fffc3d" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueGranted_ae8904fe-9a45-4bb2-b866-423e243ec4c9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueExercised_88c5977e-a5c3-4891-8b32-84754c07a8c6" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueExercised"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_f7993e66-16ef-46f3-9b10-3840b1fffc3d" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueExercised_88c5977e-a5c3-4891-8b32-84754c07a8c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueForfeited_1ec85075-c29f-43bf-9580-ca78b54419c1" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueForfeited"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_f7993e66-16ef-46f3-9b10-3840b1fffc3d" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueForfeited_1ec85075-c29f-43bf-9580-ca78b54419c1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueExpired_ec0a88c6-f266-4050-bf79-19205750e77c" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueExpired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueAbstract_f7993e66-16ef-46f3-9b10-3840b1fffc3d" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueExpired_ec0a88c6-f266-4050-bf79-19205750e77c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding_f94e3b77-b93b-4212-a50b-eff89866dec4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardEquityInstrumentsOtherThanOptionsAggregateIntrinsicValueOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueExercisable_fb3aef12-32b3-4533-ba06-bef58f5e2e8c" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueExercisable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_423275cd-107f-48fd-ba51-c50ae18fd125" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionAggregateIntrinsicValueExercisable_fb3aef12-32b3-4533-ba06-bef58f5e2e8c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageRemainingContractualTermsAbstract_b7a03ad8-c48a-4754-bccb-a02640c27d78" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageRemainingContractualTermsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_423275cd-107f-48fd-ba51-c50ae18fd125" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageRemainingContractualTermsAbstract_b7a03ad8-c48a-4754-bccb-a02640c27d78" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionOutstandingWeightedAverageRemainingContractualTerms_ba1f188a-660f-4c8e-a43c-49045f8d26a2" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionOutstandingWeightedAverageRemainingContractualTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageRemainingContractualTermsAbstract_b7a03ad8-c48a-4754-bccb-a02640c27d78" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionOutstandingWeightedAverageRemainingContractualTerms_ba1f188a-660f-4c8e-a43c-49045f8d26a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionExercisableWeightedAverageRemainingContractualTerms_c6ef7b1f-6605-43c1-ab65-082086bd499e" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionExercisableWeightedAverageRemainingContractualTerms"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsWeightedAverageRemainingContractualTermsAbstract_b7a03ad8-c48a-4754-bccb-a02640c27d78" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionExercisableWeightedAverageRemainingContractualTerms_c6ef7b1f-6605-43c1-ab65-082086bd499e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExerciePriceAbstract_3749360d-5be2-40e0-9cb6-0023e373c30a" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExerciePriceAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_423275cd-107f-48fd-ba51-c50ae18fd125" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExerciePriceAbstract_3749360d-5be2-40e0-9cb6-0023e373c30a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionOutstandingWeightedAverageExercisePrice_8f4d0e5d-a3ef-4f43-8513-f8a3354af160" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionOutstandingWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExerciePriceAbstract_3749360d-5be2-40e0-9cb6-0023e373c30a" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionOutstandingWeightedAverageExercisePrice_8f4d0e5d-a3ef-4f43-8513-f8a3354af160" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionGrantsInPeriodWeightedAverageExercisePrice_09078944-386e-482e-bb5d-d1f5278ee36a" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionGrantsInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExerciePriceAbstract_3749360d-5be2-40e0-9cb6-0023e373c30a" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionGrantsInPeriodWeightedAverageExercisePrice_09078944-386e-482e-bb5d-d1f5278ee36a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionExercisedInPeriodWeightedAverageExercisePrice_e1bee3a5-eed2-4370-b688-22bcc9ef79d1" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionExercisedInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExerciePriceAbstract_3749360d-5be2-40e0-9cb6-0023e373c30a" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionExercisedInPeriodWeightedAverageExercisePrice_e1bee3a5-eed2-4370-b688-22bcc9ef79d1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionForfeitedInPeriodWeightedAverageExercisePrice_995e7d77-7c08-4d9b-9a9c-acc557251fd2" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionForfeitedInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExerciePriceAbstract_3749360d-5be2-40e0-9cb6-0023e373c30a" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionForfeitedInPeriodWeightedAverageExercisePrice_995e7d77-7c08-4d9b-9a9c-acc557251fd2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionExpiredInPeriodWeightedAverageExercisePrice_9767fd63-eb1d-4eaa-a5c0-31c69a71b245" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionExpiredInPeriodWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExerciePriceAbstract_3749360d-5be2-40e0-9cb6-0023e373c30a" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionExpiredInPeriodWeightedAverageExercisePrice_9767fd63-eb1d-4eaa-a5c0-31c69a71b245" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionExercisableWeightedAverageExercisePrice_86b4d3cc-f3cb-4915-8a89-7cb94dcfc022" xlink:href="bhrb-20250630.xsd#bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionExercisableWeightedAverageExercisePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExerciePriceAbstract_3749360d-5be2-40e0-9cb6-0023e373c30a" xlink:to="loc_bhrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardNonOptionExercisableWeightedAverageExercisePrice_86b4d3cc-f3cb-4915-8a89-7cb94dcfc022" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/BusinessCombinationNarrativeDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#BusinessCombinationNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/BusinessCombinationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_9ff14591-7510-4017-a42a-eba877b8d467" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_823a7b94-fccc-43e9-8de1-97ab66021db9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9ff14591-7510-4017-a42a-eba877b8d467" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_823a7b94-fccc-43e9-8de1-97ab66021db9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_547e29fd-2177-43cb-b4f1-33c634787d53" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_823a7b94-fccc-43e9-8de1-97ab66021db9" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_547e29fd-2177-43cb-b4f1-33c634787d53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_547e29fd-2177-43cb-b4f1-33c634787d53_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_547e29fd-2177-43cb-b4f1-33c634787d53" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_547e29fd-2177-43cb-b4f1-33c634787d53_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6da17002-02a0-453d-8731-0209523785ad" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_547e29fd-2177-43cb-b4f1-33c634787d53" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6da17002-02a0-453d-8731-0209523785ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SummitFinancialGroupIncMember_48205bdd-d473-4303-a7e3-8d66fbddd97d" xlink:href="bhrb-20250630.xsd#bhrb_SummitFinancialGroupIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6da17002-02a0-453d-8731-0209523785ad" xlink:to="loc_bhrb_SummitFinancialGroupIncMember_48205bdd-d473-4303-a7e3-8d66fbddd97d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusAxis_8074f83a-61b1-4c2a-b05e-5e8f9ab9df61" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_823a7b94-fccc-43e9-8de1-97ab66021db9" xlink:to="loc_us-gaap_CreditLossStatusAxis_8074f83a-61b1-4c2a-b05e-5e8f9ab9df61" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusDomain_8074f83a-61b1-4c2a-b05e-5e8f9ab9df61_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditLossStatusAxis_8074f83a-61b1-4c2a-b05e-5e8f9ab9df61" xlink:to="loc_us-gaap_CreditLossStatusDomain_8074f83a-61b1-4c2a-b05e-5e8f9ab9df61_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditLossStatusDomain_e04a02ab-81d2-419c-82c1-e9bac6c0ef4e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CreditLossStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditLossStatusAxis_8074f83a-61b1-4c2a-b05e-5e8f9ab9df61" xlink:to="loc_us-gaap_CreditLossStatusDomain_e04a02ab-81d2-419c-82c1-e9bac6c0ef4e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember_b47ae453-8139-4129-b791-334b617bebeb" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditLossStatusDomain_e04a02ab-81d2-419c-82c1-e9bac6c0ef4e" xlink:to="loc_us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember_b47ae453-8139-4129-b791-334b617bebeb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationConsiderationTransferredExchangeRatio_6a027bf1-38e8-4224-9bcf-8736dd7d2480" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationConsiderationTransferredExchangeRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9ff14591-7510-4017-a42a-eba877b8d467" xlink:to="loc_bhrb_BusinessCombinationConsiderationTransferredExchangeRatio_6a027bf1-38e8-4224-9bcf-8736dd7d2480" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_4a73a048-6b1d-437d-ade2-32cd9aca0eb0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9ff14591-7510-4017-a42a-eba877b8d467" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_4a73a048-6b1d-437d-ade2-32cd9aca0eb0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockDividendRatePercentage_c94db1f0-3978-45ed-a1f5-f7403af4ee7b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_PreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9ff14591-7510-4017-a42a-eba877b8d467" xlink:to="loc_us-gaap_PreferredStockDividendRatePercentage_c94db1f0-3978-45ed-a1f5-f7403af4ee7b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_51d92ae8-db17-4fd1-a134-efc9022ac122" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9ff14591-7510-4017-a42a-eba877b8d467" xlink:to="loc_us-gaap_Goodwill_51d92ae8-db17-4fd1-a134-efc9022ac122" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_cde03365-56e2-46a2-959c-cbf91d99975d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9ff14591-7510-4017-a42a-eba877b8d467" xlink:to="loc_us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount_cde03365-56e2-46a2-959c-cbf91d99975d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_934e1d08-a270-473f-af6d-ace28fccf26d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9ff14591-7510-4017-a42a-eba877b8d467" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_934e1d08-a270-473f-af6d-ace28fccf26d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwillAndIntangibleAssets_d9dc9518-ff15-4805-9088-221310abd598" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwillAndIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9ff14591-7510-4017-a42a-eba877b8d467" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwillAndIntangibleAssets_d9dc9518-ff15-4805-9088-221310abd598" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesFairValue_17634c7e-dffa-4ed2-b188-28e896f311c9" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquiredReceivablesFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9ff14591-7510-4017-a42a-eba877b8d467" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesFairValue_17634c7e-dffa-4ed2-b188-28e896f311c9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount_5b7900a8-a0f7-404c-ab7e-ee0191be28de" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_9ff14591-7510-4017-a42a-eba877b8d467" xlink:to="loc_us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount_5b7900a8-a0f7-404c-ab7e-ee0191be28de" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/BusinessCombinationScheduleofSummarizesAdjustmentstoGoodwillSubsequentDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#BusinessCombinationScheduleofSummarizesAdjustmentstoGoodwillSubsequentDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/BusinessCombinationScheduleofSummarizesAdjustmentstoGoodwillSubsequentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_8b334adf-d778-4a7e-933f-28dea544f557" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d07d7dc8-2a4f-4788-a535-36a021a19bab" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8b334adf-d778-4a7e-933f-28dea544f557" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d07d7dc8-2a4f-4788-a535-36a021a19bab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_f399b510-56a3-4186-b09a-90174a07879a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_d07d7dc8-2a4f-4788-a535-36a021a19bab" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_f399b510-56a3-4186-b09a-90174a07879a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f399b510-56a3-4186-b09a-90174a07879a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_f399b510-56a3-4186-b09a-90174a07879a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f399b510-56a3-4186-b09a-90174a07879a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7a233e9e-8baa-494b-960d-06d921b356dd" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_f399b510-56a3-4186-b09a-90174a07879a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7a233e9e-8baa-494b-960d-06d921b356dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SummitFinancialGroupIncMember_109d2102-4f8e-41bc-b245-17834e2b598c" xlink:href="bhrb-20250630.xsd#bhrb_SummitFinancialGroupIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_7a233e9e-8baa-494b-960d-06d921b356dd" xlink:to="loc_bhrb_SummitFinancialGroupIncMember_109d2102-4f8e-41bc-b245-17834e2b598c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_097fed74-3cbc-4312-8315-2621422c3116" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8b334adf-d778-4a7e-933f-28dea544f557" xlink:to="loc_us-gaap_Goodwill_097fed74-3cbc-4312-8315-2621422c3116" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_c3c818a8-d05a-4771-a18d-d34b5d4a8403" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_8b334adf-d778-4a7e-933f-28dea544f557" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_c3c818a8-d05a-4771-a18d-d34b5d4a8403" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_40495095-03ca-4c54-a5c0-f4ef7f8d6f0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/BusinessCombinationScheduleofConsiderationGoodwillDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#BusinessCombinationScheduleofConsiderationGoodwillDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/BusinessCombinationScheduleofConsiderationGoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_2adc76e4-1fd6-4c9a-9c11-ae7c46843709" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_2adc76e4-1fd6-4c9a-9c11-ae7c46843709" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_68d09869-9f7d-4afe-afc7-d67e1c8bba5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_2adc76e4-1fd6-4c9a-9c11-ae7c46843709" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_68d09869-9f7d-4afe-afc7-d67e1c8bba5b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_68d09869-9f7d-4afe-afc7-d67e1c8bba5b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_68d09869-9f7d-4afe-afc7-d67e1c8bba5b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_68d09869-9f7d-4afe-afc7-d67e1c8bba5b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_08b67164-3622-4ea7-aec6-5d1f27d2f798" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_68d09869-9f7d-4afe-afc7-d67e1c8bba5b" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_08b67164-3622-4ea7-aec6-5d1f27d2f798" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SummitFinancialGroupIncMember_30db8f76-bcc3-4965-b820-da50350caa95" xlink:href="bhrb-20250630.xsd#bhrb_SummitFinancialGroupIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_08b67164-3622-4ea7-aec6-5d1f27d2f798" xlink:to="loc_bhrb_SummitFinancialGroupIncMember_30db8f76-bcc3-4965-b820-da50350caa95" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessAcquisitionNumberOfCommonStockSharesAcquired_14c6a161-3233-40ee-9c9e-c967291510c8" xlink:href="bhrb-20250630.xsd#bhrb_BusinessAcquisitionNumberOfCommonStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:to="loc_bhrb_BusinessAcquisitionNumberOfCommonStockSharesAcquired_14c6a161-3233-40ee-9c9e-c967291510c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationConsiderationTransferredExchangeRatio_483980b9-6700-4188-aacb-d559dcc4eba5" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationConsiderationTransferredExchangeRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:to="loc_bhrb_BusinessCombinationConsiderationTransferredExchangeRatio_483980b9-6700-4188-aacb-d559dcc4eba5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessAcquisitionExpectedEquityInterestIssuedOrIssuableNumberOfShares_5b329734-71f6-4760-b8a8-1fbf74d33d7e" xlink:href="bhrb-20250630.xsd#bhrb_BusinessAcquisitionExpectedEquityInterestIssuedOrIssuableNumberOfShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:to="loc_bhrb_BusinessAcquisitionExpectedEquityInterestIssuedOrIssuableNumberOfShares_5b329734-71f6-4760-b8a8-1fbf74d33d7e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_8af5608e-3aea-4838-b532-60c91f2b31aa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssued_8af5608e-3aea-4838-b532-60c91f2b31aa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationFractionalCommonStockPaidInCash_490cfee2-31ff-4c54-9806-4fe635d85aae" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationFractionalCommonStockPaidInCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:to="loc_bhrb_BusinessCombinationFractionalCommonStockPaidInCash_490cfee2-31ff-4c54-9806-4fe635d85aae" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionSharePrice_3127b9df-a09f-49d7-82df-347423ab9be1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionSharePrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:to="loc_us-gaap_BusinessAcquisitionSharePrice_3127b9df-a09f-49d7-82df-347423ab9be1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_7c67ad22-6bcd-4a20-bf1f-7fc10271684a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:to="loc_us-gaap_BusinessAcquisitionEquityInterestIssuedOrIssuableValueAssigned_7c67ad22-6bcd-4a20-bf1f-7fc10271684a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessAcquisitionSharePrice10DayAverageClosingPrice_816406b4-730c-4c49-b5f4-a0d2bc2b0ff3" xlink:href="bhrb-20250630.xsd#bhrb_BusinessAcquisitionSharePrice10DayAverageClosingPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:to="loc_bhrb_BusinessAcquisitionSharePrice10DayAverageClosingPrice_816406b4-730c-4c49-b5f4-a0d2bc2b0ff3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationCashPaidForFractionalShares_e8fdcc72-daf4-4559-8da2-9a08273ddb00" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationCashPaidForFractionalShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:to="loc_bhrb_BusinessCombinationCashPaidForFractionalShares_e8fdcc72-daf4-4559-8da2-9a08273ddb00" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationImpliedValueOfStockAppreciationRightsAndRestrictedStockUnits_e696dd4a-fe07-4d4a-86e5-fe12e0fe24e0" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationImpliedValueOfStockAppreciationRightsAndRestrictedStockUnits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:to="loc_bhrb_BusinessCombinationImpliedValueOfStockAppreciationRightsAndRestrictedStockUnits_e696dd4a-fe07-4d4a-86e5-fe12e0fe24e0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_3181f601-212d-4f62-8090-9776ee6aa199" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredEquityInterestsIssuedAndIssuable_3181f601-212d-4f62-8090-9776ee6aa199" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_f49d4351-78e0-4231-b1f4-ff47911c389d" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_f49d4351-78e0-4231-b1f4-ff47911c389d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_b67eb48a-04d4-4ae1-a079-73178e233561" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_44e069cc-14fd-4e4f-9dcb-0bb2dfce8c5e" xlink:to="loc_us-gaap_Goodwill_b67eb48a-04d4-4ae1-a079-73178e233561" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/BusinessCombinationScheduleofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#BusinessCombinationScheduleofAssetsAcquiredandLiabilitiesAssumedDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/BusinessCombinationScheduleofAssetsAcquiredandLiabilitiesAssumedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_a4138424-4eaa-464f-80f1-1df16fc1e38f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c83a0d8a-6a94-409e-8d1a-31cdef8ec886" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a4138424-4eaa-464f-80f1-1df16fc1e38f" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c83a0d8a-6a94-409e-8d1a-31cdef8ec886" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_eada0a3e-1165-480e-8e42-b5b8d332120a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c83a0d8a-6a94-409e-8d1a-31cdef8ec886" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_eada0a3e-1165-480e-8e42-b5b8d332120a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_eada0a3e-1165-480e-8e42-b5b8d332120a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_eada0a3e-1165-480e-8e42-b5b8d332120a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_eada0a3e-1165-480e-8e42-b5b8d332120a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_cc18d16a-a65e-4729-9113-4ca269381d0b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_eada0a3e-1165-480e-8e42-b5b8d332120a" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_cc18d16a-a65e-4729-9113-4ca269381d0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SummitFinancialGroupIncMember_0493aad7-73c6-44ad-af32-7bf7b030d0da" xlink:href="bhrb-20250630.xsd#bhrb_SummitFinancialGroupIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_cc18d16a-a65e-4729-9113-4ca269381d0b" xlink:to="loc_bhrb_SummitFinancialGroupIncMember_0493aad7-73c6-44ad-af32-7bf7b030d0da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementAxis_907ff03f-20a8-4006-9de9-8a997e2ca4d2" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_c83a0d8a-6a94-409e-8d1a-31cdef8ec886" xlink:to="loc_srt_RestatementAxis_907ff03f-20a8-4006-9de9-8a997e2ca4d2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_907ff03f-20a8-4006-9de9-8a997e2ca4d2_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RestatementAxis_907ff03f-20a8-4006-9de9-8a997e2ca4d2" xlink:to="loc_srt_RestatementDomain_907ff03f-20a8-4006-9de9-8a997e2ca4d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RestatementDomain_f2db2a19-14bb-49b0-93ad-c034f959b5fd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_RestatementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RestatementAxis_907ff03f-20a8-4006-9de9-8a997e2ca4d2" xlink:to="loc_srt_RestatementDomain_f2db2a19-14bb-49b0-93ad-c034f959b5fd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioPreviouslyReportedMember_c6b26af6-4416-4d2b-a122-af6a6200ad0d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioPreviouslyReportedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RestatementDomain_f2db2a19-14bb-49b0-93ad-c034f959b5fd" xlink:to="loc_srt_ScenarioPreviouslyReportedMember_c6b26af6-4416-4d2b-a122-af6a6200ad0d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_5992d399-3194-4013-81e1-831a89b27812" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a4138424-4eaa-464f-80f1-1df16fc1e38f" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_5992d399-3194-4013-81e1-831a89b27812" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a4138424-4eaa-464f-80f1-1df16fc1e38f" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_66d3e27a-38e3-4cbb-a55d-341c08bcc97b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_66d3e27a-38e3-4cbb-a55d-341c08bcc97b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsDebtSecuritiesAvailableForSale_dfbf7c79-623b-494c-ba1b-e88f79d1281c" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsDebtSecuritiesAvailableForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsDebtSecuritiesAvailableForSale_dfbf7c79-623b-494c-ba1b-e88f79d1281c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDebtSecuritiesHeldToMaturityAtAmortizedCost_6b02dd2f-8fe5-40fd-9833-7c806ce26abc" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDebtSecuritiesHeldToMaturityAtAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDebtSecuritiesHeldToMaturityAtAmortizedCost_6b02dd2f-8fe5-40fd-9833-7c806ce26abc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquityAndOtherInvestments_3d8fd92b-3164-4e4f-ab23-127e2ea3159b" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquityAndOtherInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedEquityAndOtherInvestments_3d8fd92b-3164-4e4f-ab23-127e2ea3159b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_f7a9426e-f553-47fe-ae7e-35761b31b6be" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_f7a9426e-f553-47fe-ae7e-35761b31b6be" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancingReceivableAllowanceForCreditLoss_4d17d23a-0fd1-493c-8c8a-36aea766d50d" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancingReceivableAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancingReceivableAllowanceForCreditLoss_4d17d23a-0fd1-493c-8c8a-36aea766d50d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_13050b87-5de1-4349-80eb-bf39594f19d0" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_13050b87-5de1-4349-80eb-bf39594f19d0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_80e77237-da8e-4517-b7ce-f7a5b1ef0e9f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment_80e77237-da8e-4517-b7ce-f7a5b1ef0e9f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestReceivable_288b5bf3-58ac-4a74-81f9-7425449650ba" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestReceivable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestReceivable_288b5bf3-58ac-4a74-81f9-7425449650ba" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCompanyOwnedLifeInsurance_edc972db-e650-411c-aa1a-412cbc9ff15b" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCompanyOwnedLifeInsurance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCompanyOwnedLifeInsurance_edc972db-e650-411c-aa1a-412cbc9ff15b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwillAndIntangibleAssets_c55b1182-f1ef-4a97-b2ab-d0ba3c2f5141" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwillAndIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedGoodwillAndIntangibleAssets_c55b1182-f1ef-4a97-b2ab-d0ba3c2f5141" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_015ff2a6-fafb-4165-bf9c-92ac23d89a7f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_015ff2a6-fafb-4165-bf9c-92ac23d89a7f" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAndGoodwill_4c55515d-37a7-40a2-9ea6-3d450d53746f" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAndGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAndGoodwill_4c55515d-37a7-40a2-9ea6-3d450d53746f" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits_9ff75f87-11f5-4fd2-9cf3-75d70995a3fe" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeposits_9ff75f87-11f5-4fd2-9cf3-75d70995a3fe" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBorrowings_44bfa92f-02ad-4ed0-8f48-f4c7d55784bf" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedBorrowings_44bfa92f-02ad-4ed0-8f48-f4c7d55784bf" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSubordinatedDebenturesAndTrustPreferredSecurities_583e0273-cda3-49f4-aaae-ec712ef295d6" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSubordinatedDebenturesAndTrustPreferredSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedSubordinatedDebenturesAndTrustPreferredSecurities_583e0273-cda3-49f4-aaae-ec712ef295d6" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedUnfundedReserveLiability_a8682116-009b-4efa-a857-a50c11c709bb" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedUnfundedReserveLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedUnfundedReserveLiability_a8682116-009b-4efa-a857-a50c11c709bb" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestAndOtherLiabilities_bd3caa84-cc5b-49b5-b94f-862578b491f1" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestAndOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_bhrb_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAccruedInterestAndOtherLiabilities_bd3caa84-cc5b-49b5-b94f-862578b491f1" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_5e225b08-e760-480b-922f-894e23a0b799" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_5e225b08-e760-480b-922f-894e23a0b799" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_ce4e7813-6212-4143-89ce-69b4d2dbfa5b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNetAbstract_56bd2b4f-314f-4e30-b0cf-60694f1e77be" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_ce4e7813-6212-4143-89ce-69b4d2dbfa5b" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a4138424-4eaa-464f-80f1-1df16fc1e38f" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDebtSecuritiesHeldToMaturityAtAmortizedCost_4813b380-ff91-4ad0-81b5-4fad86411d07" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDebtSecuritiesHeldToMaturityAtAmortizedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:to="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentDebtSecuritiesHeldToMaturityAtAmortizedCost_4813b380-ff91-4ad0-81b5-4fad86411d07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCurrentAssetsReceivables_0d240d08-d6f7-4e3a-87b1-f68fc01a9d13" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCurrentAssetsReceivables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:to="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentCurrentAssetsReceivables_0d240d08-d6f7-4e3a-87b1-f68fc01a9d13" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableAllowanceForCreditLoss_4fee13af-23db-44cf-9df3-94067e0998d1" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:to="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableAllowanceForCreditLoss_4fee13af-23db-44cf-9df3-94067e0998d1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_e72c9c69-921f-43a5-b27d-65bbcbcc1038" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:to="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancingReceivableExcludingAccruedInterestAfterAllowanceForCreditLoss_e72c9c69-921f-43a5-b27d-65bbcbcc1038" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment_198a0c2e-91ae-4cfa-b28d-e6e657b01350" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentPropertyPlantAndEquipment_198a0c2e-91ae-4cfa-b28d-e6e657b01350" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentGoodwillAndIntangibles_17117309-7700-4f26-a972-86a857b1f989" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentGoodwillAndIntangibles"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:to="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentGoodwillAndIntangibles_17117309-7700-4f26-a972-86a857b1f989" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherNoncurrentAssets_dce2b5ef-9e39-4bed-88d1-714c98db9e56" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherNoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:to="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentOtherNoncurrentAssets_dce2b5ef-9e39-4bed-88d1-714c98db9e56" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAssetsAndGoodwill_3d3d6dc8-dd4a-4f04-9065-31640e930e3e" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAssetsAndGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:to="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAssetsAndGoodwill_3d3d6dc8-dd4a-4f04-9065-31640e930e3e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteDeposits_c16d9738-8a79-4e21-bbee-5071623a1719" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteDeposits"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:to="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteDeposits_c16d9738-8a79-4e21-bbee-5071623a1719" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteSubordinatedDebenturesAndTrustPreferredSecurities_9025ffd9-8b74-48a2-bed1-05b9a3b6853f" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteSubordinatedDebenturesAndTrustPreferredSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:to="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteSubordinatedDebenturesAndTrustPreferredSecurities_9025ffd9-8b74-48a2-bed1-05b9a3b6853f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteUnfundedReserveLiability_c4558645-1758-4d5f-ab6f-944932c05c84" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteUnfundedReserveLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:to="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteUnfundedReserveLiability_c4558645-1758-4d5f-ab6f-944932c05c84" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAccruedInterestAndOtherLiabilities_0084cd9a-ac9b-4f32-9490-01d73c4fbc62" xlink:href="bhrb-20250630.xsd#bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAccruedInterestAndOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:to="loc_bhrb_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAccruedInterestAndOtherLiabilities_0084cd9a-ac9b-4f32-9490-01d73c4fbc62" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialLiabilities_fb699d8d-4457-40b8-850f-d9dff239d56c" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentFinancialLiabilities_fb699d8d-4457-40b8-850f-d9dff239d56c" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred_4d642f99-066a-4105-a3a0-29da6622fe85" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentsAbstract_9da6f121-6507-449a-9322-21621c70a8c0" xlink:to="loc_us-gaap_BusinessCombinationProvisionalInformationInitialAccountingIncompleteAdjustmentConsiderationTransferred_4d642f99-066a-4105-a3a0-29da6622fe85" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_6417bdfb-6709-47cd-a937-1f57a8e799ac" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a4138424-4eaa-464f-80f1-1df16fc1e38f" xlink:to="loc_us-gaap_Goodwill_6417bdfb-6709-47cd-a937-1f57a8e799ac" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/GoodwillandOtherIntangibleAssetsNarrativeDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#GoodwillandOtherIntangibleAssetsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/GoodwillandOtherIntangibleAssetsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b1a74351-c9c6-44b2-bf9a-47b905f5273b" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_3e2af918-4be3-466e-9c78-4a0248939e75" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b1a74351-c9c6-44b2-bf9a-47b905f5273b" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_3e2af918-4be3-466e-9c78-4a0248939e75" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_94b0d6f2-49f3-4363-a215-b9cc77b43642" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_3e2af918-4be3-466e-9c78-4a0248939e75" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_94b0d6f2-49f3-4363-a215-b9cc77b43642" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_94b0d6f2-49f3-4363-a215-b9cc77b43642_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_94b0d6f2-49f3-4363-a215-b9cc77b43642" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_94b0d6f2-49f3-4363-a215-b9cc77b43642_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5e222e5f-ae23-4794-aed2-785ab734fafc" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_94b0d6f2-49f3-4363-a215-b9cc77b43642" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5e222e5f-ae23-4794-aed2-785ab734fafc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CoreDepositsMember_fdd5cae4-bf95-44a5-95d8-f591346fb5fa" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CoreDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_5e222e5f-ae23-4794-aed2-785ab734fafc" xlink:to="loc_us-gaap_CoreDepositsMember_fdd5cae4-bf95-44a5-95d8-f591346fb5fa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_6a391528-c5f5-4899-8c65-89992ae4c473" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_3e2af918-4be3-466e-9c78-4a0248939e75" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_6a391528-c5f5-4899-8c65-89992ae4c473" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6a391528-c5f5-4899-8c65-89992ae4c473_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6a391528-c5f5-4899-8c65-89992ae4c473" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_6a391528-c5f5-4899-8c65-89992ae4c473_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e0284c76-0d83-4ea8-bb57-db4c4b45c3f3" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_6a391528-c5f5-4899-8c65-89992ae4c473" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e0284c76-0d83-4ea8-bb57-db4c4b45c3f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bhrb_SummitFinancialGroupIncMember_77b6b232-59dc-4fe5-bb30-3a25a265635b" xlink:href="bhrb-20250630.xsd#bhrb_SummitFinancialGroupIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_e0284c76-0d83-4ea8-bb57-db4c4b45c3f3" xlink:to="loc_bhrb_SummitFinancialGroupIncMember_77b6b232-59dc-4fe5-bb30-3a25a265635b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_24301759-84d3-46e0-83f0-4bcb4bdaa45e" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b1a74351-c9c6-44b2-bf9a-47b905f5273b" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_24301759-84d3-46e0-83f0-4bcb4bdaa45e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_bb169ff7-e991-4055-9233-100eb475f490" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b1a74351-c9c6-44b2-bf9a-47b905f5273b" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_bb169ff7-e991-4055-9233-100eb475f490" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_5e38adf7-3e94-4d16-bea5-a38bad220ec4" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b1a74351-c9c6-44b2-bf9a-47b905f5273b" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_5e38adf7-3e94-4d16-bea5-a38bad220ec4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_6367ca47-1fd2-449d-8996-c7c47a75beca" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_b1a74351-c9c6-44b2-bf9a-47b905f5273b" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_6367ca47-1fd2-449d-8996-c7c47a75beca" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.burkeandherbertbank.com/role/GoodwillandOtherIntangibleAssetsScheduleofFiniteLivedIntangibleAssetsDetails" xlink:type="simple" xlink:href="bhrb-20250630.xsd#GoodwillandOtherIntangibleAssetsScheduleofFiniteLivedIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.burkeandherbertbank.com/role/GoodwillandOtherIntangibleAssetsScheduleofFiniteLivedIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_067be7cc-d59e-4c1f-a5a5-03e47f72fc00" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_c0c2e6b7-dcff-4a8c-a060-88f781a9f852" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_067be7cc-d59e-4c1f-a5a5-03e47f72fc00" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_c0c2e6b7-dcff-4a8c-a060-88f781a9f852" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c5b8ec22-a037-4d83-8be3-49d62e53d543" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_c0c2e6b7-dcff-4a8c-a060-88f781a9f852" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c5b8ec22-a037-4d83-8be3-49d62e53d543" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_c5b8ec22-a037-4d83-8be3-49d62e53d543_default" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c5b8ec22-a037-4d83-8be3-49d62e53d543" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_c5b8ec22-a037-4d83-8be3-49d62e53d543_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2fb58aa8-71bc-44d8-b92b-66c21f576c98" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_c5b8ec22-a037-4d83-8be3-49d62e53d543" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2fb58aa8-71bc-44d8-b92b-66c21f576c98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CoreDepositsMember_1346af44-0022-49c0-9bcc-c353ddb3568a" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_CoreDepositsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_2fb58aa8-71bc-44d8-b92b-66c21f576c98" xlink:to="loc_us-gaap_CoreDepositsMember_1346af44-0022-49c0-9bcc-c353ddb3568a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_c4c3c79d-f24b-46d1-8b7b-fd6057e48177" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_067be7cc-d59e-4c1f-a5a5-03e47f72fc00" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_c4c3c79d-f24b-46d1-8b7b-fd6057e48177" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_191d1141-5e77-4e23-8554-4b87b49f8cd1" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_c4c3c79d-f24b-46d1-8b7b-fd6057e48177" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_191d1141-5e77-4e23-8554-4b87b49f8cd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_54e6cb52-57c5-47ec-ab0c-9146754cffd2" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinitelivedIntangibleAssetsAcquired1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_c4c3c79d-f24b-46d1-8b7b-fd6057e48177" xlink:to="loc_us-gaap_FinitelivedIntangibleAssetsAcquired1_54e6cb52-57c5-47ec-ab0c-9146754cffd2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_17022970-33e9-436d-8e2d-74af50847e48" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_c4c3c79d-f24b-46d1-8b7b-fd6057e48177" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_17022970-33e9-436d-8e2d-74af50847e48" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_d9df438b-70fd-4468-900c-3f7c48f9845f" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_ImpairmentOfIntangibleAssetsFinitelived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsRollForward_c4c3c79d-f24b-46d1-8b7b-fd6057e48177" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_d9df438b-70fd-4468-900c-3f7c48f9845f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_31dd8409-cfb8-4bc1-83ea-5ae356981961" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
  </link:definitionLink>
</link:linkbase>
