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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:a4de2be7-61ce-44a2-adf2-3f2687af7c84,g:6f01e5fe-b393-4f85-aaa6-834bc5fdda80-->
<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://hsbc.com/role/ConsolidatedincomestatementParenthetical" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ConsolidatedincomestatementParenthetical"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ConsolidatedincomestatementParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_28b47db3-6069-445a-808b-aa0cc328ed2e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_f8ee2da0-6950-4046-8f40-8fb1e185e62a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_28b47db3-6069-445a-808b-aa0cc328ed2e" xlink:to="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_f8ee2da0-6950-4046-8f40-8fb1e185e62a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncomeStatementLocation1Axis_a56e7012-d6b8-4a71-97a5-718d3db7d75f" xlink:href="hsbc-20260630.xsd#hsbc_IncomeStatementLocation1Axis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_f8ee2da0-6950-4046-8f40-8fb1e185e62a" xlink:to="loc_hsbc_IncomeStatementLocation1Axis_a56e7012-d6b8-4a71-97a5-718d3db7d75f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncomeStatementLocation1Domain_a56e7012-d6b8-4a71-97a5-718d3db7d75f_default" xlink:href="hsbc-20260630.xsd#hsbc_IncomeStatementLocation1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_IncomeStatementLocation1Axis_a56e7012-d6b8-4a71-97a5-718d3db7d75f" xlink:to="loc_hsbc_IncomeStatementLocation1Domain_a56e7012-d6b8-4a71-97a5-718d3db7d75f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncomeStatementLocation1Domain_fdd206fa-6600-4e31-bdb0-2696fd19cc30" xlink:href="hsbc-20260630.xsd#hsbc_IncomeStatementLocation1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_IncomeStatementLocation1Axis_a56e7012-d6b8-4a71-97a5-718d3db7d75f" xlink:to="loc_hsbc_IncomeStatementLocation1Domain_fdd206fa-6600-4e31-bdb0-2696fd19cc30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NetIncomeFromFinancialInstrumentsHeldForTradingOrManagedOnAFairValueBasisMember_a91f69b3-a444-48a3-a89c-4550c726595a" xlink:href="hsbc-20260630.xsd#hsbc_NetIncomeFromFinancialInstrumentsHeldForTradingOrManagedOnAFairValueBasisMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IncomeStatementLocation1Domain_fdd206fa-6600-4e31-bdb0-2696fd19cc30" xlink:to="loc_hsbc_NetIncomeFromFinancialInstrumentsHeldForTradingOrManagedOnAFairValueBasisMember_a91f69b3-a444-48a3-a89c-4550c726595a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameAxis_10d8f80b-9fd1-44b2-9df9-80bdec1652ea" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_f8ee2da0-6950-4046-8f40-8fb1e185e62a" xlink:to="loc_hsbc_DisposalGroupNameAxis_10d8f80b-9fd1-44b2-9df9-80bdec1652ea" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameDomain_10d8f80b-9fd1-44b2-9df9-80bdec1652ea_default" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_DisposalGroupNameAxis_10d8f80b-9fd1-44b2-9df9-80bdec1652ea" xlink:to="loc_hsbc_DisposalGroupNameDomain_10d8f80b-9fd1-44b2-9df9-80bdec1652ea_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameDomain_a937a9ad-31bb-497e-b7e7-708cf574bae5" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_DisposalGroupNameAxis_10d8f80b-9fd1-44b2-9df9-80bdec1652ea" xlink:to="loc_hsbc_DisposalGroupNameDomain_a937a9ad-31bb-497e-b7e7-708cf574bae5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_FrenchHomeAndOtherLoansMember_019f471d-e662-7abf-bf3c-4d110c505ac4" xlink:href="hsbc-20260630.xsd#hsbc_FrenchHomeAndOtherLoansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_a937a9ad-31bb-497e-b7e7-708cf574bae5" xlink:to="loc_hsbc_FrenchHomeAndOtherLoansMember_019f471d-e662-7abf-bf3c-4d110c505ac4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_UKLifeInsuranceBusinessMember_019f1d90-4517-77ff-83f8-e53940d9df80" xlink:href="hsbc-20260630.xsd#hsbc_UKLifeInsuranceBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_a937a9ad-31bb-497e-b7e7-708cf574bae5" xlink:to="loc_hsbc_UKLifeInsuranceBusinessMember_019f1d90-4517-77ff-83f8-e53940d9df80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCBankMaltaP.l.c.Member_019f1d93-9f34-70c3-8787-0ba8d54b313d" xlink:href="hsbc-20260630.xsd#hsbc_HSBCBankMaltaP.l.c.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_a937a9ad-31bb-497e-b7e7-708cf574bae5" xlink:to="loc_hsbc_HSBCBankMaltaP.l.c.Member_019f1d93-9f34-70c3-8787-0ba8d54b313d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_988176f2-4375-4c2a-b805-af983a6ea367" 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_ifrs-full_DisclosureOfBusinessCombinationsTable_f8ee2da0-6950-4046-8f40-8fb1e185e62a" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_988176f2-4375-4c2a-b805-af983a6ea367" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_988176f2-4375-4c2a-b805-af983a6ea367_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_988176f2-4375-4c2a-b805-af983a6ea367" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_988176f2-4375-4c2a-b805-af983a6ea367_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_c01a6adf-9a6d-439b-8713-9358a43124f0" 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_988176f2-4375-4c2a-b805-af983a6ea367" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_c01a6adf-9a6d-439b-8713-9358a43124f0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_GaliciaMember_9e01a649-ad45-458b-b271-bea65715e8c6" xlink:href="hsbc-20260630.xsd#hsbc_GaliciaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_c01a6adf-9a6d-439b-8713-9358a43124f0" xlink:to="loc_hsbc_GaliciaMember_9e01a649-ad45-458b-b271-bea65715e8c6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_7e25ee4b-b7db-4e0a-a433-f98ba78ee4a7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_f8ee2da0-6950-4046-8f40-8fb1e185e62a" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_7e25ee4b-b7db-4e0a-a433-f98ba78ee4a7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_7e25ee4b-b7db-4e0a-a433-f98ba78ee4a7_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_7e25ee4b-b7db-4e0a-a433-f98ba78ee4a7" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_7e25ee4b-b7db-4e0a-a433-f98ba78ee4a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_23eed39e-f844-4681-862c-75929466d5e4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_7e25ee4b-b7db-4e0a-a433-f98ba78ee4a7" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_23eed39e-f844-4681-862c-75929466d5e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BankOfCommunicationsCo.LimitedMember_ae5b6e79-2343-46a2-adcc-eb090f782192" xlink:href="hsbc-20260630.xsd#hsbc_BankOfCommunicationsCo.LimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_23eed39e-f844-4681-862c-75929466d5e4" xlink:to="loc_hsbc_BankOfCommunicationsCo.LimitedMember_ae5b6e79-2343-46a2-adcc-eb090f782192" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForAssetsHeldAtEndOfPeriodFairValueMeasurement_e32aa9be-f037-4374-ab44-1a152a88bfd9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForAssetsHeldAtEndOfPeriodFairValueMeasurement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_28b47db3-6069-445a-808b-aa0cc328ed2e" xlink:to="loc_ifrs-full_GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForAssetsHeldAtEndOfPeriodFairValueMeasurement_e32aa9be-f037-4374-ab44-1a152a88bfd9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLoss_3d799b01-14e0-4660-b9af-7b284d52fc6d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_28b47db3-6069-445a-808b-aa0cc328ed2e" xlink:to="loc_ifrs-full_GainsLossesOnFinancialAssetsAtFairValueThroughProfitOrLoss_3d799b01-14e0-4660-b9af-7b284d52fc6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax_019f1d90-4517-72f8-93cc-9617675f3fb1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_28b47db3-6069-445a-808b-aa0cc328ed2e" xlink:to="loc_ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax_019f1d90-4517-72f8-93cc-9617675f3fb1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation_1c970d18-eb98-44de-ab2f-989f52772bba" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_28b47db3-6069-445a-808b-aa0cc328ed2e" xlink:to="loc_ifrs-full_GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation_1c970d18-eb98-44de-ab2f-989f52772bba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DilutionLossesFromInvestmentsInAssociates_d3ef7cd1-b4cf-431e-9a6b-c57f02ef6996" xlink:href="hsbc-20260630.xsd#hsbc_DilutionLossesFromInvestmentsInAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_28b47db3-6069-445a-808b-aa0cc328ed2e" xlink:to="loc_hsbc_DilutionLossesFromInvestmentsInAssociates_d3ef7cd1-b4cf-431e-9a6b-c57f02ef6996" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_46a8a30f-8103-4c0d-8982-3d9e64765a29" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_28b47db3-6069-445a-808b-aa0cc328ed2e" xlink:to="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_46a8a30f-8103-4c0d-8982-3d9e64765a29" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/Consolidatedstatementofchangesinequity" xlink:type="simple" xlink:href="hsbc-20260630.xsd#Consolidatedstatementofchangesinequity"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/Consolidatedstatementofchangesinequity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfChangesInEquityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable_d5cd7d23-b7f8-4d54-b077-fd7cd2c37395" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfChangesInEquityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_StatementOfChangesInEquityTable_d5cd7d23-b7f8-4d54-b077-fd7cd2c37395" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_7de840ea-d007-497d-b4a4-52070e288e12" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_d5cd7d23-b7f8-4d54-b077-fd7cd2c37395" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_7de840ea-d007-497d-b4a4-52070e288e12" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_7de840ea-d007-497d-b4a4-52070e288e12_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_7de840ea-d007-497d-b4a4-52070e288e12" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_7de840ea-d007-497d-b4a4-52070e288e12_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_66ae43bc-27a9-498d-85fc-a5960e53a332" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_7de840ea-d007-497d-b4a4-52070e288e12" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_66ae43bc-27a9-498d-85fc-a5960e53a332" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_d2782291-0dba-4824-a66d-e7b314ea31c0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_66ae43bc-27a9-498d-85fc-a5960e53a332" xlink:to="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_d2782291-0dba-4824-a66d-e7b314ea31c0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IssuedCapitalAndSharePremiumMember_6505d00b-0d30-46c0-affc-18446ae5cd4b" xlink:href="hsbc-20260630.xsd#hsbc_IssuedCapitalAndSharePremiumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_d2782291-0dba-4824-a66d-e7b314ea31c0" xlink:to="loc_hsbc_IssuedCapitalAndSharePremiumMember_6505d00b-0d30-46c0-affc-18446ae5cd4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherEquityInterestMember_d827c58e-4cd3-4f43-9d4a-249be654b45f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherEquityInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_d2782291-0dba-4824-a66d-e7b314ea31c0" xlink:to="loc_ifrs-full_OtherEquityInterestMember_d827c58e-4cd3-4f43-9d4a-249be654b45f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember_70421968-f7df-4bd4-bfc3-296b0f584c46" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_d2782291-0dba-4824-a66d-e7b314ea31c0" xlink:to="loc_ifrs-full_ReserveOfGainsAndLossesOnFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeMember_70421968-f7df-4bd4-bfc3-296b0f584c46" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfCashFlowHedgesMember_a2adebb7-63e0-4e71-852d-e79d3e1ffb11" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfCashFlowHedgesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_d2782291-0dba-4824-a66d-e7b314ea31c0" xlink:to="loc_ifrs-full_ReserveOfCashFlowHedgesMember_a2adebb7-63e0-4e71-852d-e79d3e1ffb11" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_4ac4b937-99a1-4f80-9f27-9229a1543217" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_d2782291-0dba-4824-a66d-e7b314ea31c0" xlink:to="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_4ac4b937-99a1-4f80-9f27-9229a1543217" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MergerReserveMember_574dfa29-8952-45d5-a926-fa040b98c79a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MergerReserveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_d2782291-0dba-4824-a66d-e7b314ea31c0" xlink:to="loc_ifrs-full_MergerReserveMember_574dfa29-8952-45d5-a926-fa040b98c79a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfInsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedExcludedFromProfitOrLossThatWillBeReclassifiedToProfitOrLossMember_b4c9bdaa-cb54-4eea-bb55-8ee4b76dc75b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfInsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedExcludedFromProfitOrLossThatWillBeReclassifiedToProfitOrLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_d2782291-0dba-4824-a66d-e7b314ea31c0" xlink:to="loc_ifrs-full_ReserveOfInsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedExcludedFromProfitOrLossThatWillBeReclassifiedToProfitOrLossMember_b4c9bdaa-cb54-4eea-bb55-8ee4b76dc75b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarningsMember_3dcf6ba4-e950-40d8-b9f1-c80df7ae6310" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_d2782291-0dba-4824-a66d-e7b314ea31c0" xlink:to="loc_ifrs-full_RetainedEarningsMember_3dcf6ba4-e950-40d8-b9f1-c80df7ae6310" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncontrollingInterestsMember_a13764a1-cede-4b6c-af90-f3cae5140ee8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncontrollingInterestsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_66ae43bc-27a9-498d-85fc-a5960e53a332" xlink:to="loc_ifrs-full_NoncontrollingInterestsMember_a13764a1-cede-4b6c-af90-f3cae5140ee8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_537ce67e-4bca-4580-872a-5c6986f4d4da" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_Equity_537ce67e-4bca-4580-872a-5c6986f4d4da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss_93bff015-e0e6-476b-b9a7-4509ac558aea" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_ProfitLoss_93bff015-e0e6-476b-b9a7-4509ac558aea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncome_014a2b2a-ad03-4959-a385-5f70501caba8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_OtherComprehensiveIncome_014a2b2a-ad03-4959-a385-5f70501caba8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherComprehensiveIncomeNetOfTaxFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeExcludingDisposalOfSubsidiary_53dfb11e-063f-46a8-af8b-6789dd99a594" xlink:href="hsbc-20260630.xsd#hsbc_OtherComprehensiveIncomeNetOfTaxFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeExcludingDisposalOfSubsidiary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_hsbc_OtherComprehensiveIncomeNetOfTaxFinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeExcludingDisposalOfSubsidiary_53dfb11e-063f-46a8-af8b-6789dd99a594" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments_fbca3bfa-06ac-4a0a-a74e-c16d16a2c3c9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesFromInvestmentsInEquityInstruments_fbca3bfa-06ac-4a0a-a74e-c16d16a2c3c9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherComprehensiveIncomeNetOfTaxCashFlowHedgesExcludingDisposalOfSubsidiary_5fb4108f-cf4a-4b94-b165-c11b2aba7644" xlink:href="hsbc-20260630.xsd#hsbc_OtherComprehensiveIncomeNetOfTaxCashFlowHedgesExcludingDisposalOfSubsidiary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_hsbc_OtherComprehensiveIncomeNetOfTaxCashFlowHedgesExcludingDisposalOfSubsidiary_5fb4108f-cf4a-4b94-b165-c11b2aba7644" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability_b6d288d6-beed-47ff-925d-36fc5b6d4e98" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxChangeInFairValueOfFinancialLiabilityAttributableToChangeInCreditRiskOfLiability_b6d288d6-beed-47ff-925d-36fc5b6d4e98" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRevaluation_1d252307-5c48-4fd2-9262-43163cdaf557" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRevaluation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRevaluation_1d252307-5c48-4fd2-9262-43163cdaf557" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_24949183-7610-4c6d-9b75-d55d7d814956" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxGainsLossesOnRemeasurementsOfDefinedBenefitPlans_24949183-7610-4c6d-9b75-d55d7d814956" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossNetOfTax_0c24081f-a057-47cf-a9dc-2c4566dd344c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_ShareOfOtherComprehensiveIncomeOfAssociatesAndJointVenturesAccountedForUsingEquityMethodThatWillBeReclassifiedToProfitOrLossNetOfTax_0c24081f-a057-47cf-a9dc-2c4566dd344c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherComprehensiveIncomeNetOfTaxGainsLossesFromEffectsOfHyperinflation_6e3dd8f9-f7a7-4654-b73e-30707821c4da" xlink:href="hsbc-20260630.xsd#hsbc_OtherComprehensiveIncomeNetOfTaxGainsLossesFromEffectsOfHyperinflation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_hsbc_OtherComprehensiveIncomeNetOfTaxGainsLossesFromEffectsOfHyperinflation_6e3dd8f9-f7a7-4654-b73e-30707821c4da" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax_5f594559-4ac0-47bf-9831-e015854898f1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax_5f594559-4ac0-47bf-9831-e015854898f1" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughOtherReservesReclassifiedToIncomeStatementOnDisposalOfAForeignOperationEquity_575c7de4-9bc6-45a1-a3e9-9fbacf848e08" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughOtherReservesReclassifiedToIncomeStatementOnDisposalOfAForeignOperationEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_hsbc_IncreaseDecreaseThroughOtherReservesReclassifiedToIncomeStatementOnDisposalOfAForeignOperationEquity_575c7de4-9bc6-45a1-a3e9-9fbacf848e08" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxInsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedExcludedFromProfitOrLossThatWillBeReclassifiedToProfitOrLoss_e1bbc86e-39b9-469c-817c-22dbb2755a83" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncomeNetOfTaxInsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedExcludedFromProfitOrLossThatWillBeReclassifiedToProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeNetOfTaxInsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedExcludedFromProfitOrLossThatWillBeReclassifiedToProfitOrLoss_e1bbc86e-39b9-469c-817c-22dbb2755a83" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax_03ed3168-030b-4976-b760-3fb9b209d266" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationNetOfTax_03ed3168-030b-4976-b760-3fb9b209d266" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncome_531599f8-341d-4b5c-af4f-62bf0ff88825" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_ComprehensiveIncome_531599f8-341d-4b5c-af4f-62bf0ff88825" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_b0d5cb80-32ba-4080-96d1-21560c5982ec" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughExerciseOfOptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughExerciseOfOptions_b0d5cb80-32ba-4080-96d1-21560c5982ec" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughTransferBetweenSharePremiumToRetainedEarningsEquity_019f1da6-f22f-731d-8ceb-8d3588da0580" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughTransferBetweenSharePremiumToRetainedEarningsEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_hsbc_IncreaseDecreaseThroughTransferBetweenSharePremiumToRetainedEarningsEquity_019f1da6-f22f-731d-8ceb-8d3588da0580" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughTransferBetweenCapitalRedemptionReservesAndRetainedEarningsEquity_019f1da6-f22f-7da1-bced-cf4b56569cbe" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughTransferBetweenCapitalRedemptionReservesAndRetainedEarningsEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_hsbc_IncreaseDecreaseThroughTransferBetweenCapitalRedemptionReservesAndRetainedEarningsEquity_019f1da6-f22f-7da1-bced-cf4b56569cbe" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssueOfEquity_b4bed821-4ad2-4424-9816-c58a4beb9b7c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssueOfEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_IssueOfEquity_b4bed821-4ad2-4424-9816-c58a4beb9b7c" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaid_454e67d5-53e4-474d-9610-9e605ee64795" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_DividendsPaid_454e67d5-53e4-474d-9610-9e605ee64795" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReductionOfIssuedCapital_5ad8df0a-1463-44ce-bfbb-e8ae136cb58e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReductionOfIssuedCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_ReductionOfIssuedCapital_5ad8df0a-1463-44ce-bfbb-e8ae136cb58e" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_8ab510da-1187-417b-9b4e-a83fcaf455a3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_8ab510da-1187-417b-9b4e-a83fcaf455a3" xlink:type="arc" order="22"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughTransferBetweenMergerReserveAndRetainedEarningsEquity_37c3b33e-ed4f-4d24-9570-97a47ed6dd1d" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughTransferBetweenMergerReserveAndRetainedEarningsEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_hsbc_IncreaseDecreaseThroughTransferBetweenMergerReserveAndRetainedEarningsEquity_37c3b33e-ed4f-4d24-9570-97a47ed6dd1d" xlink:type="arc" order="23"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions_f1e5e64c-b9fc-4d53-8344-60c84b0dbbe7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTreasuryShareTransactions_f1e5e64c-b9fc-4d53-8344-60c84b0dbbe7" xlink:type="arc" order="24"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CancellationOfTreasuryShares_0727d5e3-94db-4d8b-b5af-bc4ff596932a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CancellationOfTreasuryShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_CancellationOfTreasuryShares_0727d5e3-94db-4d8b-b5af-bc4ff596932a" xlink:type="arc" order="25"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl_019f1e02-6788-7a64-bfa8-75e9fc7a3f4b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl_019f1e02-6788-7a64-bfa8-75e9fc7a3f4b" xlink:type="arc" order="26"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseFromTransferOfGainLossOnDisposalOfEquityInstrumentsToRetainedEarningsNet_019f1e05-7877-7bf7-86ee-f1dac5ac28ab" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseFromTransferOfGainLossOnDisposalOfEquityInstrumentsToRetainedEarningsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_hsbc_IncreaseDecreaseFromTransferOfGainLossOnDisposalOfEquityInstrumentsToRetainedEarningsNet_019f1e05-7877-7bf7-86ee-f1dac5ac28ab" xlink:type="arc" order="27"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_c16c7656-7819-44b1-b6b0-25e71eb85550" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_65e9b27d-1152-426e-b2ba-5ff65514a004" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_c16c7656-7819-44b1-b6b0-25e71eb85550" xlink:type="arc" order="28"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_a951399c-5e81-4278-b767-a9c0b3c8245e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ConsolidatedstatementofchangesinequityParenthetical" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ConsolidatedstatementofchangesinequityParenthetical"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ConsolidatedstatementofchangesinequityParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems_066958d2-ec0a-4f1b-bacf-c7ec81b674c0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfChangesInEquityLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityTable_0b19b2b7-8533-4549-908d-daec600b9562" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfChangesInEquityTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_066958d2-ec0a-4f1b-bacf-c7ec81b674c0" xlink:to="loc_ifrs-full_StatementOfChangesInEquityTable_0b19b2b7-8533-4549-908d-daec600b9562" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameAxis_a05cefd2-f666-4912-9642-86b5f906b47c" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_0b19b2b7-8533-4549-908d-daec600b9562" xlink:to="loc_hsbc_DisposalGroupNameAxis_a05cefd2-f666-4912-9642-86b5f906b47c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameDomain_a05cefd2-f666-4912-9642-86b5f906b47c_default" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_DisposalGroupNameAxis_a05cefd2-f666-4912-9642-86b5f906b47c" xlink:to="loc_hsbc_DisposalGroupNameDomain_a05cefd2-f666-4912-9642-86b5f906b47c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameDomain_6d1d97c8-e5f6-4eed-93fa-b790606c9b8e" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_DisposalGroupNameAxis_a05cefd2-f666-4912-9642-86b5f906b47c" xlink:to="loc_hsbc_DisposalGroupNameDomain_6d1d97c8-e5f6-4eed-93fa-b790606c9b8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_UKLifeInsuranceBusinessMember_019f1dae-52b3-7ce1-abfc-580112d0f808" xlink:href="hsbc-20260630.xsd#hsbc_UKLifeInsuranceBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_6d1d97c8-e5f6-4eed-93fa-b790606c9b8e" xlink:to="loc_hsbc_UKLifeInsuranceBusinessMember_019f1dae-52b3-7ce1-abfc-580112d0f808" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfEntitysOwnEquityInstrumentsAxis_8b12270b-df64-4b45-a827-51269050d865" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfEntitysOwnEquityInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_0b19b2b7-8533-4549-908d-daec600b9562" xlink:to="loc_ifrs-full_ClassesOfEntitysOwnEquityInstrumentsAxis_8b12270b-df64-4b45-a827-51269050d865" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfEntitysOwnEquityInstrumentsDomain_8b12270b-df64-4b45-a827-51269050d865_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfEntitysOwnEquityInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfEntitysOwnEquityInstrumentsAxis_8b12270b-df64-4b45-a827-51269050d865" xlink:to="loc_ifrs-full_ClassesOfEntitysOwnEquityInstrumentsDomain_8b12270b-df64-4b45-a827-51269050d865_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfEntitysOwnEquityInstrumentsDomain_0dc1a6ca-abd4-471c-9fb6-71271b9ce338" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfEntitysOwnEquityInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfEntitysOwnEquityInstrumentsAxis_8b12270b-df64-4b45-a827-51269050d865" xlink:to="loc_ifrs-full_ClassesOfEntitysOwnEquityInstrumentsDomain_0dc1a6ca-abd4-471c-9fb6-71271b9ce338" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_A1250m6.750PerpetualSubordinatedContingentConvertibleSecuritiesMember_019f1db0-9f7f-7ced-a2ef-760d53fb77d8" xlink:href="hsbc-20260630.xsd#hsbc_A1250m6.750PerpetualSubordinatedContingentConvertibleSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfEntitysOwnEquityInstrumentsDomain_0dc1a6ca-abd4-471c-9fb6-71271b9ce338" xlink:to="loc_hsbc_A1250m6.750PerpetualSubordinatedContingentConvertibleSecuritiesMember_019f1db0-9f7f-7ced-a2ef-760d53fb77d8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_A1250m7.000PerpetualSubordinatedContingentConvertibleSecuritiesMember_019f1db0-fc93-735a-b11d-17ee054cbbb7" xlink:href="hsbc-20260630.xsd#hsbc_A1250m7.000PerpetualSubordinatedContingentConvertibleSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfEntitysOwnEquityInstrumentsDomain_0dc1a6ca-abd4-471c-9fb6-71271b9ce338" xlink:to="loc_hsbc_A1250m7.000PerpetualSubordinatedContingentConvertibleSecuritiesMember_019f1db0-fc93-735a-b11d-17ee054cbbb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_A1500m6.750PerpetualSubordinatedContingentConvertibleSecuritiesMember_019f6ff4-e496-78b4-a462-9a40af8fd7ef" xlink:href="hsbc-20260630.xsd#hsbc_A1500m6.750PerpetualSubordinatedContingentConvertibleSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfEntitysOwnEquityInstrumentsDomain_0dc1a6ca-abd4-471c-9fb6-71271b9ce338" xlink:to="loc_hsbc_A1500m6.750PerpetualSubordinatedContingentConvertibleSecuritiesMember_019f6ff4-e496-78b4-a462-9a40af8fd7ef" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_A1000m4.000PerpetualSubordinatedContingentConvertibleSecuritiesMember_019f1db2-a4be-7ade-93f3-73096161e75c" xlink:href="hsbc-20260630.xsd#hsbc_A1000m4.000PerpetualSubordinatedContingentConvertibleSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfEntitysOwnEquityInstrumentsDomain_0dc1a6ca-abd4-471c-9fb6-71271b9ce338" xlink:to="loc_hsbc_A1000m4.000PerpetualSubordinatedContingentConvertibleSecuritiesMember_019f1db2-a4be-7ade-93f3-73096161e75c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019f1daf-5428-7574-ad27-d12efed049b7" 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_ifrs-full_StatementOfChangesInEquityTable_0b19b2b7-8533-4549-908d-daec600b9562" xlink:to="loc_dei_LegalEntityAxis_019f1daf-5428-7574-ad27-d12efed049b7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019f1daf-5428-7574-ad27-d12efed049b7_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_019f1daf-5428-7574-ad27-d12efed049b7" xlink:to="loc_dei_EntityDomain_019f1daf-5428-7574-ad27-d12efed049b7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019f1daf-5428-721d-a32b-5357429047d1" 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_019f1daf-5428-7574-ad27-d12efed049b7" xlink:to="loc_dei_EntityDomain_019f1daf-5428-721d-a32b-5357429047d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCHoldingsMember_019f1daf-5428-7765-abe5-4916e176e209" xlink:href="hsbc-20260630.xsd#hsbc_HSBCHoldingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019f1daf-5428-721d-a32b-5357429047d1" xlink:to="loc_hsbc_HSBCHoldingsMember_019f1daf-5428-7765-abe5-4916e176e209" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_019f1db5-b3db-7004-81fc-f108efd5e0c5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_0b19b2b7-8533-4549-908d-daec600b9562" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_019f1db5-b3db-7004-81fc-f108efd5e0c5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_019f1db5-b3db-7004-81fc-f108efd5e0c5_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_019f1db5-b3db-7004-81fc-f108efd5e0c5" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_019f1db5-b3db-7004-81fc-f108efd5e0c5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_019f1db5-b3db-74d0-9d00-eccedc2d4452" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_019f1db5-b3db-7004-81fc-f108efd5e0c5" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_019f1db5-b3db-74d0-9d00-eccedc2d4452" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HangSengBankMember_019f1db5-f8bb-7063-a61f-9af9f770010f" xlink:href="hsbc-20260630.xsd#hsbc_HangSengBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_019f1db5-b3db-74d0-9d00-eccedc2d4452" xlink:to="loc_hsbc_HangSengBankMember_019f1db5-f8bb-7063-a61f-9af9f770010f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_019f1e03-70f3-7226-9323-fbe1c08990fe" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_0b19b2b7-8533-4549-908d-daec600b9562" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_019f1e03-70f3-7226-9323-fbe1c08990fe" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019f1e03-70f3-7226-9323-fbe1c08990fe_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_019f1e03-70f3-7226-9323-fbe1c08990fe" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019f1e03-70f3-7226-9323-fbe1c08990fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019f1e03-70f3-7cc4-a9b2-7cfca8cb23a0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_019f1e03-70f3-7226-9323-fbe1c08990fe" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019f1e03-70f3-7cc4-a9b2-7cfca8cb23a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncontrollingInterestsMember_019f1e03-70f3-718e-ae4f-04800fb9e709" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncontrollingInterestsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019f1e03-70f3-7cc4-a9b2-7cfca8cb23a0" xlink:to="loc_ifrs-full_NoncontrollingInterestsMember_019f1e03-70f3-718e-ae4f-04800fb9e709" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_019f89ed-4efc-7ed5-9906-dbd7783fde65" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019f1e03-70f3-7cc4-a9b2-7cfca8cb23a0" xlink:to="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_019f89ed-4efc-7ed5-9906-dbd7783fde65" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax_9417a835-4e98-4d0f-a411-ce91494267dc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_066958d2-ec0a-4f1b-bacf-c7ec81b674c0" xlink:to="loc_ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax_9417a835-4e98-4d0f-a411-ce91494267dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotionalAmount_c3072fb1-97ad-4d7b-8415-ca15c89a734b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_066958d2-ec0a-4f1b-bacf-c7ec81b674c0" xlink:to="loc_ifrs-full_NotionalAmount_c3072fb1-97ad-4d7b-8415-ca15c89a734b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_EquityInstrumentsInterestRate_4908ad90-fe71-46d5-8d92-2ccfd8236e99" xlink:href="hsbc-20260630.xsd#hsbc_EquityInstrumentsInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_066958d2-ec0a-4f1b-bacf-c7ec81b674c0" xlink:to="loc_hsbc_EquityInstrumentsInterestRate_4908ad90-fe71-46d5-8d92-2ccfd8236e99" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReductionOfIssuedCapital_f1de3ddd-991c-4900-b7e6-d49fcf5bb4e0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReductionOfIssuedCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_066958d2-ec0a-4f1b-bacf-c7ec81b674c0" xlink:to="loc_ifrs-full_ReductionOfIssuedCapital_f1de3ddd-991c-4900-b7e6-d49fcf5bb4e0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl_019f1e03-70f3-70c3-aa6a-503ccb4e1040" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_066958d2-ec0a-4f1b-bacf-c7ec81b674c0" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughChangesInOwnershipInterestsInSubsidiariesThatDoNotResultInLossOfControl_019f1e03-70f3-70c3-aa6a-503ccb4e1040" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_019f1e06-e1cc-79dc-94ee-bf25e1868a1f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_066958d2-ec0a-4f1b-bacf-c7ec81b674c0" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughSharebasedPaymentTransactions_019f1e06-e1cc-79dc-94ee-bf25e1868a1f" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ConsolidatedstatementofcashflowsParenthetical" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ConsolidatedstatementofcashflowsParenthetical"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ConsolidatedstatementofcashflowsParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_d5732e81-13c1-46dc-90a0-41cca2366c28" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_6ec19652-6601-4dcc-a5c9-cfc3870a7d0b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfBusinessCombinationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_d5732e81-13c1-46dc-90a0-41cca2366c28" xlink:to="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_6ec19652-6601-4dcc-a5c9-cfc3870a7d0b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_9f34f456-9520-4bf3-86e0-7dbc574d16d1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_6ec19652-6601-4dcc-a5c9-cfc3870a7d0b" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_9f34f456-9520-4bf3-86e0-7dbc574d16d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_9f34f456-9520-4bf3-86e0-7dbc574d16d1_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_9f34f456-9520-4bf3-86e0-7dbc574d16d1" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_9f34f456-9520-4bf3-86e0-7dbc574d16d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_154c2b38-0694-4938-8a96-b56a9da61d69" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_9f34f456-9520-4bf3-86e0-7dbc574d16d1" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_154c2b38-0694-4938-8a96-b56a9da61d69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BankOfCommunicationsCo.LimitedMember_ede4a7a7-575a-43c4-a9fe-4fad6e941999" xlink:href="hsbc-20260630.xsd#hsbc_BankOfCommunicationsCo.LimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_154c2b38-0694-4938-8a96-b56a9da61d69" xlink:to="loc_hsbc_BankOfCommunicationsCo.LimitedMember_ede4a7a7-575a-43c4-a9fe-4fad6e941999" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InterestReceived_2e035eb5-f57f-4d3e-989b-f5e02f7e96ac" xlink:href="hsbc-20260630.xsd#hsbc_InterestReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_d5732e81-13c1-46dc-90a0-41cca2366c28" xlink:to="loc_hsbc_InterestReceived_2e035eb5-f57f-4d3e-989b-f5e02f7e96ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InterestPaid_2db66daf-9f8f-4265-a68b-3b88a31292b0" xlink:href="hsbc-20260630.xsd#hsbc_InterestPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_d5732e81-13c1-46dc-90a0-41cca2366c28" xlink:to="loc_hsbc_InterestPaid_2db66daf-9f8f-4265-a68b-3b88a31292b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsReceived_925dd23b-37ee-49f5-a1da-a687b567f9ba" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsReceived"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_d5732e81-13c1-46dc-90a0-41cca2366c28" xlink:to="loc_ifrs-full_DividendsReceived_925dd23b-37ee-49f5-a1da-a687b567f9ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DilutionLossesFromInvestmentsInAssociates_4a55bc10-c151-4462-ae43-56c5fd0df04c" xlink:href="hsbc-20260630.xsd#hsbc_DilutionLossesFromInvestmentsInAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_d5732e81-13c1-46dc-90a0-41cca2366c28" xlink:to="loc_hsbc_DilutionLossesFromInvestmentsInAssociates_4a55bc10-c151-4462-ae43-56c5fd0df04c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_f10bf882-df58-41f0-9c2d-31b3dabc0ef0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_d5732e81-13c1-46dc-90a0-41cca2366c28" xlink:to="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_f10bf882-df58-41f0-9c2d-31b3dabc0ef0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalentsClassifiedAsPartOfDisposalGroupHeldForSale_e499320b-4b7c-4e32-91a0-121636b04e61" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashAndCashEquivalentsClassifiedAsPartOfDisposalGroupHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_d5732e81-13c1-46dc-90a0-41cca2366c28" xlink:to="loc_ifrs-full_CashAndCashEquivalentsClassifiedAsPartOfDisposalGroupHeldForSale_e499320b-4b7c-4e32-91a0-121636b04e61" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/NetfeeincomeDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#NetfeeincomeDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/NetfeeincomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:href="hsbc-20260630.xsd#hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseTable_0f873df0-cd4b-41ca-9067-aafe424d0666" xlink:href="hsbc-20260630.xsd#hsbc_DisclosureOfAnalysisOfIncomeAndExpenseTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseTable_0f873df0-cd4b-41ca-9067-aafe424d0666" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsAxis_20a542ec-da0a-4c84-b0f2-b45a89ab48a2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseTable_0f873df0-cd4b-41ca-9067-aafe424d0666" xlink:to="loc_ifrs-full_SegmentsAxis_20a542ec-da0a-4c84-b0f2-b45a89ab48a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_20a542ec-da0a-4c84-b0f2-b45a89ab48a2_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentsAxis_20a542ec-da0a-4c84-b0f2-b45a89ab48a2" xlink:to="loc_ifrs-full_SegmentsDomain_20a542ec-da0a-4c84-b0f2-b45a89ab48a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_8bf220fe-ab6c-45fa-8fda-39d2b2504792" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentsAxis_20a542ec-da0a-4c84-b0f2-b45a89ab48a2" xlink:to="loc_ifrs-full_SegmentsDomain_8bf220fe-ab6c-45fa-8fda-39d2b2504792" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_HK_cb0b934f-75b2-4827-b2f4-66b756d70029" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_HK"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_8bf220fe-ab6c-45fa-8fda-39d2b2504792" xlink:to="loc_country_HK_cb0b934f-75b2-4827-b2f4-66b756d70029" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_fd063688-cc63-407b-9279-a1b45b683bac" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_8bf220fe-ab6c-45fa-8fda-39d2b2504792" xlink:to="loc_country_GB_fd063688-cc63-407b-9279-a1b45b683bac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CorporateAndInstitutionalBankingCIBMember_60e0e4ec-eba1-4b6a-b1c6-46506729797f" xlink:href="hsbc-20260630.xsd#hsbc_CorporateAndInstitutionalBankingCIBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_8bf220fe-ab6c-45fa-8fda-39d2b2504792" xlink:to="loc_hsbc_CorporateAndInstitutionalBankingCIBMember_60e0e4ec-eba1-4b6a-b1c6-46506729797f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InternationalWealthAndPremierBankingIWPBMember_bab110e4-41f2-498b-b03c-71f8a91b2853" xlink:href="hsbc-20260630.xsd#hsbc_InternationalWealthAndPremierBankingIWPBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_8bf220fe-ab6c-45fa-8fda-39d2b2504792" xlink:to="loc_hsbc_InternationalWealthAndPremierBankingIWPBMember_bab110e4-41f2-498b-b03c-71f8a91b2853" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CorporateCentreMember_09d3ded0-8b72-4c91-83e5-44cc42df4ad5" xlink:href="hsbc-20260630.xsd#hsbc_CorporateCentreMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_8bf220fe-ab6c-45fa-8fda-39d2b2504792" xlink:to="loc_hsbc_CorporateCentreMember_09d3ded0-8b72-4c91-83e5-44cc42df4ad5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PortfolioAndOtherManagementFeeIncome_cadd9bbb-ffea-40e9-8e28-0d6b88654e98" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PortfolioAndOtherManagementFeeIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_ifrs-full_PortfolioAndOtherManagementFeeIncome_cadd9bbb-ffea-40e9-8e28-0d6b88654e98" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CardServicesFeeIncome_9db19653-229a-4310-b3ba-edb0bddc1fef" xlink:href="hsbc-20260630.xsd#hsbc_CardServicesFeeIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_hsbc_CardServicesFeeIncome_9db19653-229a-4310-b3ba-edb0bddc1fef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditrelatedFeeAndCommissionIncome_9495a418-9278-4699-b7a6-0a58a19d977f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditrelatedFeeAndCommissionIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_ifrs-full_CreditrelatedFeeAndCommissionIncome_9495a418-9278-4699-b7a6-0a58a19d977f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_AccountServicesFeeIncome_e9977bbe-e485-4c4c-9193-5332216a6109" xlink:href="hsbc-20260630.xsd#hsbc_AccountServicesFeeIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_hsbc_AccountServicesFeeIncome_e9977bbe-e485-4c4c-9193-5332216a6109" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BrokerageFeeIncome_623bcd0f-fe1e-48cd-beaf-d5c6150a7b08" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BrokerageFeeIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_ifrs-full_BrokerageFeeIncome_623bcd0f-fe1e-48cd-beaf-d5c6150a7b08" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_UnitTrustsFeeAndCommissionIncome_e169e257-d9d3-46f2-8ac4-44fee6f84dbe" xlink:href="hsbc-20260630.xsd#hsbc_UnitTrustsFeeAndCommissionIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_hsbc_UnitTrustsFeeAndCommissionIncome_e169e257-d9d3-46f2-8ac4-44fee6f84dbe" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_UnderwritingIncomeLoss1_c3e34bec-fa6f-4e0a-bff8-c1145baa6bbe" xlink:href="hsbc-20260630.xsd#hsbc_UnderwritingIncomeLoss1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_hsbc_UnderwritingIncomeLoss1_c3e34bec-fa6f-4e0a-bff8-c1145baa6bbe" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_GlobalCustodyFeeAndCommissionIncome_86cbcff0-1396-4ba5-aa9f-382f09682692" xlink:href="hsbc-20260630.xsd#hsbc_GlobalCustodyFeeAndCommissionIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_hsbc_GlobalCustodyFeeAndCommissionIncome_86cbcff0-1396-4ba5-aa9f-382f09682692" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_RemittanceFeeAndCommissionIncome_2ad7c6b0-85f9-483e-96f9-be8532919065" xlink:href="hsbc-20260630.xsd#hsbc_RemittanceFeeAndCommissionIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_hsbc_RemittanceFeeAndCommissionIncome_2ad7c6b0-85f9-483e-96f9-be8532919065" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ImportAndExportTradeFinanceFeeIncome_b78e5896-bd24-41a9-9a59-c8d3b7d8ab6b" xlink:href="hsbc-20260630.xsd#hsbc_ImportAndExportTradeFinanceFeeIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_hsbc_ImportAndExportTradeFinanceFeeIncome_b78e5896-bd24-41a9-9a59-c8d3b7d8ab6b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InsuranceAgencyFeeAndCommissionIncome_1462b62e-c353-47dc-920b-42e35169633f" xlink:href="hsbc-20260630.xsd#hsbc_InsuranceAgencyFeeAndCommissionIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_hsbc_InsuranceAgencyFeeAndCommissionIncome_1462b62e-c353-47dc-920b-42e35169633f" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherFeeAndCommissionIncome_f953fb0d-4399-4bd0-88c3-540f7d4e8377" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherFeeAndCommissionIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_ifrs-full_OtherFeeAndCommissionIncome_f953fb0d-4399-4bd0-88c3-540f7d4e8377" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FeeAndCommissionIncome_5f253fa4-2147-42d6-a6b4-f54119593319" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FeeAndCommissionIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_ifrs-full_FeeAndCommissionIncome_5f253fa4-2147-42d6-a6b4-f54119593319" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FeeAndCommissionExpense_433d0566-cb23-432f-a546-e49284849314" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FeeAndCommissionExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_ifrs-full_FeeAndCommissionExpense_433d0566-cb23-432f-a546-e49284849314" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FeeAndCommissionIncomeExpense_b971faf0-6270-44a6-b31b-6a2532787f18" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FeeAndCommissionIncomeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfAnalysisOfIncomeAndExpenseLineItems_bd48c08f-c01b-43c1-804b-67b37080634f" xlink:to="loc_ifrs-full_FeeAndCommissionIncomeExpense_b971faf0-6270-44a6-b31b-6a2532787f18" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/DividendsCommentaryDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#DividendsCommentaryDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/DividendsCommentaryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_213f5922-fa02-4fc9-8c63-58983fe902bf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_63a721a7-a101-4033-b417-1476fe6a7547" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfClassesOfShareCapitalTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_213f5922-fa02-4fc9-8c63-58983fe902bf" xlink:to="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_63a721a7-a101-4033-b417-1476fe6a7547" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_f718d58e-8497-46a4-9490-e9e501b1955e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_63a721a7-a101-4033-b417-1476fe6a7547" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_f718d58e-8497-46a4-9490-e9e501b1955e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_f718d58e-8497-46a4-9490-e9e501b1955e_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_f718d58e-8497-46a4-9490-e9e501b1955e" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_f718d58e-8497-46a4-9490-e9e501b1955e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_25e8728f-c9fd-4c1a-9e79-f380c2b2c063" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_f718d58e-8497-46a4-9490-e9e501b1955e" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_25e8728f-c9fd-4c1a-9e79-f380c2b2c063" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_SecondInterimDividend2026Member_52c2925e-d39b-4a87-8b01-0af058c58ddc" xlink:href="hsbc-20260630.xsd#hsbc_SecondInterimDividend2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_25e8728f-c9fd-4c1a-9e79-f380c2b2c063" xlink:to="loc_hsbc_SecondInterimDividend2026Member_52c2925e-d39b-4a87-8b01-0af058c58ddc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis_6ca38660-2291-4847-8a48-acb0509bb571" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_63a721a7-a101-4033-b417-1476fe6a7547" xlink:to="loc_ifrs-full_ClassesOfShareCapitalAxis_6ca38660-2291-4847-8a48-acb0509bb571" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_6ca38660-2291-4847-8a48-acb0509bb571_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_6ca38660-2291-4847-8a48-acb0509bb571" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_6ca38660-2291-4847-8a48-acb0509bb571_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_a8f80e58-0d9a-40a6-a5ab-a1a825b2e293" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_6ca38660-2291-4847-8a48-acb0509bb571" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_a8f80e58-0d9a-40a6-a5ab-a1a825b2e293" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OrdinarySharesMember_c309f03e-01b5-4a84-9b82-ca81fa4ddfd8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OrdinarySharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_a8f80e58-0d9a-40a6-a5ab-a1a825b2e293" xlink:to="loc_ifrs-full_OrdinarySharesMember_c309f03e-01b5-4a84-9b82-ca81fa4ddfd8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare_ddb0d680-72cf-484b-875f-7bf29d20c3d4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_213f5922-fa02-4fc9-8c63-58983fe902bf" xlink:to="loc_ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare_ddb0d680-72cf-484b-875f-7bf29d20c3d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwners_51dbe3d6-7308-47e0-9ba3-f383afebddf8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_213f5922-fa02-4fc9-8c63-58983fe902bf" xlink:to="loc_ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwners_51dbe3d6-7308-47e0-9ba3-f383afebddf8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentDividendPayables_56a89aa3-7872-49f5-bd1f-5dc078b2e2c2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentDividendPayables"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_213f5922-fa02-4fc9-8c63-58983fe902bf" xlink:to="loc_ifrs-full_CurrentDividendPayables_56a89aa3-7872-49f5-bd1f-5dc078b2e2c2" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/DividendsDividendstoshareholdersoftheparentcompanyDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#DividendsDividendstoshareholdersoftheparentcompanyDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/DividendsDividendstoshareholdersoftheparentcompanyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DividendsPayable1LineItems_b90ecbac-366b-4335-894b-2c38ba4be8a5" xlink:href="hsbc-20260630.xsd#hsbc_DividendsPayable1LineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DividendsPayable1Table_1ccba781-8df3-4d44-9abb-8fe9f65e3765" xlink:href="hsbc-20260630.xsd#hsbc_DividendsPayable1Table"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_hsbc_DividendsPayable1LineItems_b90ecbac-366b-4335-894b-2c38ba4be8a5" xlink:to="loc_hsbc_DividendsPayable1Table_1ccba781-8df3-4d44-9abb-8fe9f65e3765" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_Dividends1Axis_60fd3677-d2b0-42cc-9f38-4a8881801b2c" xlink:href="hsbc-20260630.xsd#hsbc_Dividends1Axis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DividendsPayable1Table_1ccba781-8df3-4d44-9abb-8fe9f65e3765" xlink:to="loc_hsbc_Dividends1Axis_60fd3677-d2b0-42cc-9f38-4a8881801b2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_Dividends1Domain_60fd3677-d2b0-42cc-9f38-4a8881801b2c_default" xlink:href="hsbc-20260630.xsd#hsbc_Dividends1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_Dividends1Axis_60fd3677-d2b0-42cc-9f38-4a8881801b2c" xlink:to="loc_hsbc_Dividends1Domain_60fd3677-d2b0-42cc-9f38-4a8881801b2c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_Dividends1Domain_4d6fecc1-13c9-41da-9943-542c65d9cb7b" xlink:href="hsbc-20260630.xsd#hsbc_Dividends1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_Dividends1Axis_60fd3677-d2b0-42cc-9f38-4a8881801b2c" xlink:to="loc_hsbc_Dividends1Domain_4d6fecc1-13c9-41da-9943-542c65d9cb7b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_FourthInterimDividendMember_9c818232-5e47-4158-8f46-12a5250e3cd1" xlink:href="hsbc-20260630.xsd#hsbc_FourthInterimDividendMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_Dividends1Domain_4d6fecc1-13c9-41da-9943-542c65d9cb7b" xlink:to="loc_hsbc_FourthInterimDividendMember_9c818232-5e47-4158-8f46-12a5250e3cd1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_FirstInterimDividendMember_03f91d07-6d5a-40cd-8bcb-2cfb68f0272a" xlink:href="hsbc-20260630.xsd#hsbc_FirstInterimDividendMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_Dividends1Domain_4d6fecc1-13c9-41da-9943-542c65d9cb7b" xlink:to="loc_hsbc_FirstInterimDividendMember_03f91d07-6d5a-40cd-8bcb-2cfb68f0272a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_57d7556d-081a-4acf-99c5-5de8b695eeb0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DividendsPayable1Table_1ccba781-8df3-4d44-9abb-8fe9f65e3765" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_57d7556d-081a-4acf-99c5-5de8b695eeb0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_57d7556d-081a-4acf-99c5-5de8b695eeb0_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_57d7556d-081a-4acf-99c5-5de8b695eeb0" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_57d7556d-081a-4acf-99c5-5de8b695eeb0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_0400554a-cfb2-4444-90be-3f5bb41a6a46" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ComponentsOfEquityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ComponentsOfEquityAxis_57d7556d-081a-4acf-99c5-5de8b695eeb0" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_0400554a-cfb2-4444-90be-3f5bb41a6a46" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherEquityInterestMember_59786103-4eb2-46df-a145-a517ee8bd7af" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherEquityInterestMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_0400554a-cfb2-4444-90be-3f5bb41a6a46" xlink:to="loc_ifrs-full_OtherEquityInterestMember_59786103-4eb2-46df-a145-a517ee8bd7af" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_1016ca5b-173a-4a50-ae98-cec0777f4fe5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAttributableToOwnersOfParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_0400554a-cfb2-4444-90be-3f5bb41a6a46" xlink:to="loc_ifrs-full_EquityAttributableToOwnersOfParentMember_1016ca5b-173a-4a50-ae98-cec0777f4fe5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaidOrdinarySharesPerShare_689aa8a3-1492-48b4-84aa-5e1225118255" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsPaidOrdinarySharesPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DividendsPayable1LineItems_b90ecbac-366b-4335-894b-2c38ba4be8a5" xlink:to="loc_ifrs-full_DividendsPaidOrdinarySharesPerShare_689aa8a3-1492-48b4-84aa-5e1225118255" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaidOrdinaryShares_c9ff4189-bbe3-4c9f-80dc-fe5844fc4e93" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsPaidOrdinaryShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DividendsPayable1LineItems_b90ecbac-366b-4335-894b-2c38ba4be8a5" xlink:to="loc_ifrs-full_DividendsPaidOrdinaryShares_c9ff4189-bbe3-4c9f-80dc-fe5844fc4e93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaidOtherShares_15e9edcc-195a-4043-9e62-097f22f41c58" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsPaidOtherShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DividendsPayable1LineItems_b90ecbac-366b-4335-894b-2c38ba4be8a5" xlink:to="loc_ifrs-full_DividendsPaidOtherShares_15e9edcc-195a-4043-9e62-097f22f41c58" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaid_9193142a-bb69-46c7-8010-b37f87f6a685" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DividendsPayable1LineItems_b90ecbac-366b-4335-894b-2c38ba4be8a5" xlink:to="loc_ifrs-full_DividendsPaid_9193142a-bb69-46c7-8010-b37f87f6a685" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/SegmentalanalysisConstantcurrencyprofitbeforetaxandbalancesheetdataDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#SegmentalanalysisConstantcurrencyprofitbeforetaxandbalancesheetdataDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/SegmentalanalysisConstantcurrencyprofitbeforetaxandbalancesheetdataDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_4a9d9deb-293a-4092-b304-86306c3561ce" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_4a9d9deb-293a-4092-b304-86306c3561ce" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsAxis_dc9a7f86-24a1-4ecf-bcef-0fa89708793b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_4a9d9deb-293a-4092-b304-86306c3561ce" xlink:to="loc_ifrs-full_SegmentConsolidationItemsAxis_dc9a7f86-24a1-4ecf-bcef-0fa89708793b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsDomain_dc9a7f86-24a1-4ecf-bcef-0fa89708793b_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentConsolidationItemsAxis_dc9a7f86-24a1-4ecf-bcef-0fa89708793b" xlink:to="loc_ifrs-full_SegmentConsolidationItemsDomain_dc9a7f86-24a1-4ecf-bcef-0fa89708793b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsDomain_708d20a9-b0a6-4601-a936-aceb3530693e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentConsolidationItemsAxis_dc9a7f86-24a1-4ecf-bcef-0fa89708793b" xlink:to="loc_ifrs-full_SegmentConsolidationItemsDomain_708d20a9-b0a6-4601-a936-aceb3530693e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OperatingSegmentsMember_63d22260-348d-42d9-bb53-db7d5e4133b1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentConsolidationItemsDomain_708d20a9-b0a6-4601-a936-aceb3530693e" xlink:to="loc_ifrs-full_OperatingSegmentsMember_63d22260-348d-42d9-bb53-db7d5e4133b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OperatingSegmentsExcludingIntersegmentEliminationMember_31e29fc7-8610-4e18-9ec5-7abcab22cd5f" xlink:href="hsbc-20260630.xsd#hsbc_OperatingSegmentsExcludingIntersegmentEliminationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentConsolidationItemsDomain_708d20a9-b0a6-4601-a936-aceb3530693e" xlink:to="loc_hsbc_OperatingSegmentsExcludingIntersegmentEliminationMember_31e29fc7-8610-4e18-9ec5-7abcab22cd5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EliminationOfIntersegmentAmountsMember_660ed234-7949-4549-a20e-a9d354e38f30" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EliminationOfIntersegmentAmountsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentConsolidationItemsDomain_708d20a9-b0a6-4601-a936-aceb3530693e" xlink:to="loc_ifrs-full_EliminationOfIntersegmentAmountsMember_660ed234-7949-4549-a20e-a9d354e38f30" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsAxis_4962b843-283c-48dd-8b38-89933d6d737a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_4a9d9deb-293a-4092-b304-86306c3561ce" xlink:to="loc_ifrs-full_SegmentsAxis_4962b843-283c-48dd-8b38-89933d6d737a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_4962b843-283c-48dd-8b38-89933d6d737a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentsAxis_4962b843-283c-48dd-8b38-89933d6d737a" xlink:to="loc_ifrs-full_SegmentsDomain_4962b843-283c-48dd-8b38-89933d6d737a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_32fbe42b-0cba-4f6a-bee5-5ce15744c09d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentsAxis_4962b843-283c-48dd-8b38-89933d6d737a" xlink:to="loc_ifrs-full_SegmentsDomain_32fbe42b-0cba-4f6a-bee5-5ce15744c09d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_HK_37a81c69-e4bf-4e98-a306-18d0ceec2dce" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_HK"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_32fbe42b-0cba-4f6a-bee5-5ce15744c09d" xlink:to="loc_country_HK_37a81c69-e4bf-4e98-a306-18d0ceec2dce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_d40dcac6-0240-4846-b9fc-afeb20b0ea48" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_32fbe42b-0cba-4f6a-bee5-5ce15744c09d" xlink:to="loc_country_GB_d40dcac6-0240-4846-b9fc-afeb20b0ea48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CorporateAndInstitutionalBankingCIBMember_790999bb-d848-4e33-9e3d-752a0549333c" xlink:href="hsbc-20260630.xsd#hsbc_CorporateAndInstitutionalBankingCIBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_32fbe42b-0cba-4f6a-bee5-5ce15744c09d" xlink:to="loc_hsbc_CorporateAndInstitutionalBankingCIBMember_790999bb-d848-4e33-9e3d-752a0549333c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InternationalWealthAndPremierBankingIWPBMember_d286b561-ab11-4d95-a285-d00448e6c6cf" xlink:href="hsbc-20260630.xsd#hsbc_InternationalWealthAndPremierBankingIWPBMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_32fbe42b-0cba-4f6a-bee5-5ce15744c09d" xlink:to="loc_hsbc_InternationalWealthAndPremierBankingIWPBMember_d286b561-ab11-4d95-a285-d00448e6c6cf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CorporateCentreMember_0013a29b-47f6-4d32-a72f-18cbd8ea37c4" xlink:href="hsbc-20260630.xsd#hsbc_CorporateCentreMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_32fbe42b-0cba-4f6a-bee5-5ce15744c09d" xlink:to="loc_hsbc_CorporateCentreMember_0013a29b-47f6-4d32-a72f-18cbd8ea37c4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_019f89f3-4b94-7284-bb3b-8f222c84142a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_4a9d9deb-293a-4092-b304-86306c3561ce" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_019f89f3-4b94-7284-bb3b-8f222c84142a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_019f89f3-4b94-7284-bb3b-8f222c84142a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_019f89f3-4b94-7284-bb3b-8f222c84142a" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_019f89f3-4b94-7284-bb3b-8f222c84142a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_019f89f3-4b94-74a4-a60b-2080edcdda48" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_019f89f3-4b94-7284-bb3b-8f222c84142a" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_019f89f3-4b94-74a4-a60b-2080edcdda48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BankOfCommunicationsCo.LimitedMember_019f89f3-4b94-7c4f-8fd4-52dab6998229" xlink:href="hsbc-20260630.xsd#hsbc_BankOfCommunicationsCo.LimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_019f89f3-4b94-74a4-a60b-2080edcdda48" xlink:to="loc_hsbc_BankOfCommunicationsCo.LimitedMember_019f89f3-4b94-7c4f-8fd4-52dab6998229" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NumberOfGlobalFunctions_d93c2292-8548-4160-9a23-31a8144ce5b1" xlink:href="hsbc-20260630.xsd#hsbc_NumberOfGlobalFunctions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_hsbc_NumberOfGlobalFunctions_d93c2292-8548-4160-9a23-31a8144ce5b1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueAndOperatingIncome_31ead279-614d-47f6-93f8-5180e9cfa6cf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueAndOperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_ifrs-full_RevenueAndOperatingIncome_31ead279-614d-47f6-93f8-5180e9cfa6cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestRevenueExpense_88498f37-a1e3-4298-9750-8cd9b882ac91" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRevenueExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_ifrs-full_InterestRevenueExpense_88498f37-a1e3-4298-9750-8cd9b882ac91" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossLoansImpairmentChargesAndOtherRiskProvisions_043ea52b-dd41-4bac-aec8-89500c29fdfd" xlink:href="hsbc-20260630.xsd#hsbc_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossLoansImpairmentChargesAndOtherRiskProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_hsbc_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossLoansImpairmentChargesAndOtherRiskProvisions_043ea52b-dd41-4bac-aec8-89500c29fdfd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NetOperatingIncome_67fa54ca-7d46-42cb-b147-a6b5bfeb2718" xlink:href="hsbc-20260630.xsd#hsbc_NetOperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_hsbc_NetOperatingIncome_67fa54ca-7d46-42cb-b147-a6b5bfeb2718" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OperatingExpense_d160ee2d-07c1-4497-b458-d781a3af8d4b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OperatingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_ifrs-full_OperatingExpense_d160ee2d-07c1-4497-b458-d781a3af8d4b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossFromOperatingActivities_3ed11140-e486-408e-bd4a-8e77cc074d3a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossFromOperatingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_ifrs-full_ProfitLossFromOperatingActivities_3ed11140-e486-408e-bd4a-8e77cc074d3a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_26f826b0-7d64-42be-af4b-7efaa048618f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_26f826b0-7d64-42be-af4b-7efaa048618f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax_63d6dde2-0db9-44c9-910f-8558352e535a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_ifrs-full_ProfitLossBeforeTax_63d6dde2-0db9-44c9-910f-8558352e535a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_PercentageOfEntitysAdjustedProfitLossBeforeTax_543327ff-1f75-4023-be05-46bfa136dac0" xlink:href="hsbc-20260630.xsd#hsbc_PercentageOfEntitysAdjustedProfitLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_hsbc_PercentageOfEntitysAdjustedProfitLossBeforeTax_543327ff-1f75-4023-be05-46bfa136dac0" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_AdjustedCostEfficiencyRatio_3ff90a2c-4592-4057-9419-c1daf1ba6604" xlink:href="hsbc-20260630.xsd#hsbc_AdjustedCostEfficiencyRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_hsbc_AdjustedCostEfficiencyRatio_3ff90a2c-4592-4057-9419-c1daf1ba6604" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LoansAndAdvancesToCustomers_0e45e0e4-1875-4fa3-83ba-173413327cf5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LoansAndAdvancesToCustomers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_ifrs-full_LoansAndAdvancesToCustomers_0e45e0e4-1875-4fa3-83ba-173413327cf5" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates_303b7841-0a46-4df6-aa92-541e59949d7a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates_303b7841-0a46-4df6-aa92-541e59949d7a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets_633b9c9e-283d-4894-965d-34a3533bd0a7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_ifrs-full_Assets_633b9c9e-283d-4894-965d-34a3533bd0a7" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepositsFromCustomers_8c77cc3c-377a-473d-bc7a-b0b3de80b0fd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepositsFromCustomers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_ifrs-full_DepositsFromCustomers_8c77cc3c-377a-473d-bc7a-b0b3de80b0fd" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedRecognisedInProfitOrLoss_d47c370e-4c78-466e-b53b-685fcaa8ebae" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedRecognisedInProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_ifrs-full_InsuranceFinanceIncomeExpensesFromInsuranceContractsIssuedRecognisedInProfitOrLoss_d47c370e-4c78-466e-b53b-685fcaa8ebae" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DilutionLossesFromInvestmentsInAssociates_019f89f3-4b94-7831-8d5f-84d4a5640109" xlink:href="hsbc-20260630.xsd#hsbc_DilutionLossesFromInvestmentsInAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_hsbc_DilutionLossesFromInvestmentsInAssociates_019f89f3-4b94-7831-8d5f-84d4a5640109" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_019f89f3-4b94-75b4-be9e-9215363a6427" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_91d58b6c-6721-40ae-aa5d-6018e94b59a0" xlink:to="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_019f89f3-4b94-75b4-be9e-9215363a6427" xlink:type="arc" order="17"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/SegmentalanalysisReportedexternalnetoperatingincomebycountryterritoryDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#SegmentalanalysisReportedexternalnetoperatingincomebycountryterritoryDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/SegmentalanalysisReportedexternalnetoperatingincomebycountryterritoryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfGeographicalAreasLineItems_b9974f0c-2034-4abc-8429-c3468042dc0a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfGeographicalAreasLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfGeographicalAreasTable_4399d9b9-77a4-44b5-a12c-4d411c25fbf5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfGeographicalAreasTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfGeographicalAreasLineItems_b9974f0c-2034-4abc-8429-c3468042dc0a" xlink:to="loc_ifrs-full_DisclosureOfGeographicalAreasTable_4399d9b9-77a4-44b5-a12c-4d411c25fbf5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasAxis_4a46355a-aa1b-4106-a58a-2cafd028ca1f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfGeographicalAreasTable_4399d9b9-77a4-44b5-a12c-4d411c25fbf5" xlink:to="loc_ifrs-full_GeographicalAreasAxis_4a46355a-aa1b-4106-a58a-2cafd028ca1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasDomain_4a46355a-aa1b-4106-a58a-2cafd028ca1f_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_GeographicalAreasAxis_4a46355a-aa1b-4106-a58a-2cafd028ca1f" xlink:to="loc_ifrs-full_GeographicalAreasDomain_4a46355a-aa1b-4106-a58a-2cafd028ca1f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasDomain_66eea83d-0f82-4529-9084-d3d852d24085" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GeographicalAreasDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_GeographicalAreasAxis_4a46355a-aa1b-4106-a58a-2cafd028ca1f" xlink:to="loc_ifrs-full_GeographicalAreasDomain_66eea83d-0f82-4529-9084-d3d852d24085" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_bc64e6be-ec97-4a9e-947c-3f1920931d05" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_66eea83d-0f82-4529-9084-d3d852d24085" xlink:to="loc_country_GB_bc64e6be-ec97-4a9e-947c-3f1920931d05" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_HK_3000dcb5-d260-4501-bfcf-9317886a3dcf" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_HK"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_66eea83d-0f82-4529-9084-d3d852d24085" xlink:to="loc_country_HK_3000dcb5-d260-4501-bfcf-9317886a3dcf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_ec1ce246-5bad-42b4-b7f9-d33dfc09baa3" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_66eea83d-0f82-4529-9084-d3d852d24085" xlink:to="loc_country_US_ec1ce246-5bad-42b4-b7f9-d33dfc09baa3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_884c9ece-0ed9-4ab1-9dfd-0c25b06b9402" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_66eea83d-0f82-4529-9084-d3d852d24085" xlink:to="loc_country_CN_884c9ece-0ed9-4ab1-9dfd-0c25b06b9402" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherCountriesMember_567e5674-7d14-4fad-aaf0-27d193a633b4" xlink:href="hsbc-20260630.xsd#hsbc_OtherCountriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_66eea83d-0f82-4529-9084-d3d852d24085" xlink:to="loc_hsbc_OtherCountriesMember_567e5674-7d14-4fad-aaf0-27d193a633b4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueAndOperatingIncome_c74b1c05-034c-4c11-9b36-a6e4e5ad394c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueAndOperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfGeographicalAreasLineItems_b9974f0c-2034-4abc-8429-c3468042dc0a" xlink:to="loc_ifrs-full_RevenueAndOperatingIncome_c74b1c05-034c-4c11-9b36-a6e4e5ad394c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/SegmentalanalysisConstantcurrencyresultsreconciliationDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#SegmentalanalysisConstantcurrencyresultsreconciliationDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/SegmentalanalysisConstantcurrencyresultsreconciliationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_526e809b-d89d-4520-beb9-ccd646616a47" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_ff5e9afc-3895-47c9-9e0f-859b5a57d0dc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_526e809b-d89d-4520-beb9-ccd646616a47" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_ff5e9afc-3895-47c9-9e0f-859b5a57d0dc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsAxis_9fea18a2-6b82-4ecd-9432-a879a1f5c04a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_ff5e9afc-3895-47c9-9e0f-859b5a57d0dc" xlink:to="loc_ifrs-full_SegmentConsolidationItemsAxis_9fea18a2-6b82-4ecd-9432-a879a1f5c04a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsDomain_9fea18a2-6b82-4ecd-9432-a879a1f5c04a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentConsolidationItemsAxis_9fea18a2-6b82-4ecd-9432-a879a1f5c04a" xlink:to="loc_ifrs-full_SegmentConsolidationItemsDomain_9fea18a2-6b82-4ecd-9432-a879a1f5c04a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsDomain_1a6d4ade-1d24-4bdd-94ed-448f90e4c8b7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentConsolidationItemsAxis_9fea18a2-6b82-4ecd-9432-a879a1f5c04a" xlink:to="loc_ifrs-full_SegmentConsolidationItemsDomain_1a6d4ade-1d24-4bdd-94ed-448f90e4c8b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OperatingSegmentsMember_060e2517-04f0-4c8e-aee8-753084bca62a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentConsolidationItemsDomain_1a6d4ade-1d24-4bdd-94ed-448f90e4c8b7" xlink:to="loc_ifrs-full_OperatingSegmentsMember_060e2517-04f0-4c8e-aee8-753084bca62a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CorporateAndReconcilingItemsMember_40ff6dfb-bcba-4dee-9ea9-ccd30d12d5ea" xlink:href="hsbc-20260630.xsd#hsbc_CorporateAndReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentConsolidationItemsDomain_1a6d4ade-1d24-4bdd-94ed-448f90e4c8b7" xlink:to="loc_hsbc_CorporateAndReconcilingItemsMember_40ff6dfb-bcba-4dee-9ea9-ccd30d12d5ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueAndOperatingIncome_c0244af8-bab0-4058-aa64-b1e21f14bc37" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueAndOperatingIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_526e809b-d89d-4520-beb9-ccd646616a47" xlink:to="loc_ifrs-full_RevenueAndOperatingIncome_c0244af8-bab0-4058-aa64-b1e21f14bc37" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossLoansImpairmentChargesAndOtherRiskProvisions_79d2e5be-73ef-4d87-ada3-0404b4e5018d" xlink:href="hsbc-20260630.xsd#hsbc_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossLoansImpairmentChargesAndOtherRiskProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_526e809b-d89d-4520-beb9-ccd646616a47" xlink:to="loc_hsbc_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossLoansImpairmentChargesAndOtherRiskProvisions_79d2e5be-73ef-4d87-ada3-0404b4e5018d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OperatingExpense_4071609f-4b7c-4997-9484-d0f1a5cc3aa9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OperatingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_526e809b-d89d-4520-beb9-ccd646616a47" xlink:to="loc_ifrs-full_OperatingExpense_4071609f-4b7c-4997-9484-d0f1a5cc3aa9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethodLessImpairment_ab88dfe9-8e45-4fab-beea-33e9923fa428" xlink:href="hsbc-20260630.xsd#hsbc_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethodLessImpairment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_526e809b-d89d-4520-beb9-ccd646616a47" xlink:to="loc_hsbc_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethodLessImpairment_ab88dfe9-8e45-4fab-beea-33e9923fa428" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLossBeforeTax_c1a5c69f-d16d-4695-a62f-8c096b1e475d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProfitLossBeforeTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_526e809b-d89d-4520-beb9-ccd646616a47" xlink:to="loc_ifrs-full_ProfitLossBeforeTax_c1a5c69f-d16d-4695-a62f-8c096b1e475d" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/SegmentalanalysisConstantcurrencybalancesheetreconciliationDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#SegmentalanalysisConstantcurrencybalancesheetreconciliationDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/SegmentalanalysisConstantcurrencybalancesheetreconciliationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_d932b0eb-a702-49d4-aef3-3ce7e89b6f7b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_25d9d11d-6d6e-4f2a-bd27-ae810e3ebc6a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_d932b0eb-a702-49d4-aef3-3ce7e89b6f7b" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_25d9d11d-6d6e-4f2a-bd27-ae810e3ebc6a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsAxis_539c2e2c-d41b-4076-a875-2d7fc901e93f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_25d9d11d-6d6e-4f2a-bd27-ae810e3ebc6a" xlink:to="loc_ifrs-full_SegmentConsolidationItemsAxis_539c2e2c-d41b-4076-a875-2d7fc901e93f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsDomain_539c2e2c-d41b-4076-a875-2d7fc901e93f_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SegmentConsolidationItemsAxis_539c2e2c-d41b-4076-a875-2d7fc901e93f" xlink:to="loc_ifrs-full_SegmentConsolidationItemsDomain_539c2e2c-d41b-4076-a875-2d7fc901e93f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsDomain_a3a15a5d-170a-4e64-9c31-9b3bfda16ea2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SegmentConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SegmentConsolidationItemsAxis_539c2e2c-d41b-4076-a875-2d7fc901e93f" xlink:to="loc_ifrs-full_SegmentConsolidationItemsDomain_a3a15a5d-170a-4e64-9c31-9b3bfda16ea2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OperatingSegmentsMember_64242911-d3b9-4744-90cd-948493521b9a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentConsolidationItemsDomain_a3a15a5d-170a-4e64-9c31-9b3bfda16ea2" xlink:to="loc_ifrs-full_OperatingSegmentsMember_64242911-d3b9-4744-90cd-948493521b9a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CorporateAndReconcilingItemsMember_916a67d6-d0a5-4aa0-92fd-dcdcacd107b5" xlink:href="hsbc-20260630.xsd#hsbc_CorporateAndReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentConsolidationItemsDomain_a3a15a5d-170a-4e64-9c31-9b3bfda16ea2" xlink:to="loc_hsbc_CorporateAndReconcilingItemsMember_916a67d6-d0a5-4aa0-92fd-dcdcacd107b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LoansAndAdvancesToCustomers_7923de24-c875-4637-851a-1b4cdb5834ac" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LoansAndAdvancesToCustomers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_d932b0eb-a702-49d4-aef3-3ce7e89b6f7b" xlink:to="loc_ifrs-full_LoansAndAdvancesToCustomers_7923de24-c875-4637-851a-1b4cdb5834ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates_b924a45f-22e1-46e4-89b1-4a597fcee33a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_d932b0eb-a702-49d4-aef3-3ce7e89b6f7b" xlink:to="loc_ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates_b924a45f-22e1-46e4-89b1-4a597fcee33a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets_27c8b764-c009-45b5-83d0-fb1403fc0036" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_d932b0eb-a702-49d4-aef3-3ce7e89b6f7b" xlink:to="loc_ifrs-full_Assets_27c8b764-c009-45b5-83d0-fb1403fc0036" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepositsFromCustomers_56f25fd6-4a30-4c57-ae33-fec786148199" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepositsFromCustomers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_d932b0eb-a702-49d4-aef3-3ce7e89b6f7b" xlink:to="loc_ifrs-full_DepositsFromCustomers_56f25fd6-4a30-4c57-ae33-fec786148199" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/SegmentalanalysisNotableitemsDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#SegmentalanalysisNotableitemsDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/SegmentalanalysisNotableitemsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_97dfd15d-464c-4740-a061-d289690a0e4c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_87273d70-588e-44b7-8932-dbc7be04b00a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOperatingSegmentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_97dfd15d-464c-4740-a061-d289690a0e4c" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_87273d70-588e-44b7-8932-dbc7be04b00a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_9653ec44-d473-434e-93b1-a4a366b73519" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_87273d70-588e-44b7-8932-dbc7be04b00a" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_9653ec44-d473-434e-93b1-a4a366b73519" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_9653ec44-d473-434e-93b1-a4a366b73519_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_9653ec44-d473-434e-93b1-a4a366b73519" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_9653ec44-d473-434e-93b1-a4a366b73519_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_46e5833f-a0bf-4654-b8d5-d1721b04a196" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_9653ec44-d473-434e-93b1-a4a366b73519" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_46e5833f-a0bf-4654-b8d5-d1721b04a196" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BankOfCommunicationsCo.LimitedMember_fde89a60-b314-4266-af93-588c649b4da7" xlink:href="hsbc-20260630.xsd#hsbc_BankOfCommunicationsCo.LimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_46e5833f-a0bf-4654-b8d5-d1721b04a196" xlink:to="loc_hsbc_BankOfCommunicationsCo.LimitedMember_fde89a60-b314-4266-af93-588c649b4da7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameAxis_5d0ac2fd-1af3-425e-be7e-de26fd7d1567" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_87273d70-588e-44b7-8932-dbc7be04b00a" xlink:to="loc_hsbc_DisposalGroupNameAxis_5d0ac2fd-1af3-425e-be7e-de26fd7d1567" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameDomain_5d0ac2fd-1af3-425e-be7e-de26fd7d1567_default" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_DisposalGroupNameAxis_5d0ac2fd-1af3-425e-be7e-de26fd7d1567" xlink:to="loc_hsbc_DisposalGroupNameDomain_5d0ac2fd-1af3-425e-be7e-de26fd7d1567_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameDomain_34c2062c-c835-451c-9ba5-99126d8bd43c" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_DisposalGroupNameAxis_5d0ac2fd-1af3-425e-be7e-de26fd7d1567" xlink:to="loc_hsbc_DisposalGroupNameDomain_34c2062c-c835-451c-9ba5-99126d8bd43c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_UKLifeInsuranceBusinessMember_019f1e19-e393-720b-af0e-0e429eaf5556" xlink:href="hsbc-20260630.xsd#hsbc_UKLifeInsuranceBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_34c2062c-c835-451c-9ba5-99126d8bd43c" xlink:to="loc_hsbc_UKLifeInsuranceBusinessMember_019f1e19-e393-720b-af0e-0e429eaf5556" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCBankMaltaP.l.c.Member_019f1e1a-0dda-7d4d-b3d0-102e2c838821" xlink:href="hsbc-20260630.xsd#hsbc_HSBCBankMaltaP.l.c.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_34c2062c-c835-451c-9ba5-99126d8bd43c" xlink:to="loc_hsbc_HSBCBankMaltaP.l.c.Member_019f1e1a-0dda-7d4d-b3d0-102e2c838821" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCArgentinaHoldingsS.A.Member_019f1e1b-cc9a-75a5-b420-ffd9e5d90f56" xlink:href="hsbc-20260630.xsd#hsbc_HSBCArgentinaHoldingsS.A.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_34c2062c-c835-451c-9ba5-99126d8bd43c" xlink:to="loc_hsbc_HSBCArgentinaHoldingsS.A.Member_019f1e1b-cc9a-75a5-b420-ffd9e5d90f56" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueAbstract_e494f266-5e9c-4c1c-a20d-e69226bae239" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_97dfd15d-464c-4740-a061-d289690a0e4c" xlink:to="loc_ifrs-full_RevenueAbstract_e494f266-5e9c-4c1c-a20d-e69226bae239" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_RevenueFromDisposalsAcquisitionsAndInvestmentInBusinesses_0cfeaa65-d29d-4b18-9144-d969ff4edd68" xlink:href="hsbc-20260630.xsd#hsbc_RevenueFromDisposalsAcquisitionsAndInvestmentInBusinesses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RevenueAbstract_e494f266-5e9c-4c1c-a20d-e69226bae239" xlink:to="loc_hsbc_RevenueFromDisposalsAcquisitionsAndInvestmentInBusinesses_0cfeaa65-d29d-4b18-9144-d969ff4edd68" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DilutionLossesFromInvestmentsInAssociates_eb076a33-62f4-4cdb-b445-d1233c1b70a7" xlink:href="hsbc-20260630.xsd#hsbc_DilutionLossesFromInvestmentsInAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RevenueAbstract_e494f266-5e9c-4c1c-a20d-e69226bae239" xlink:to="loc_hsbc_DilutionLossesFromInvestmentsInAssociates_eb076a33-62f4-4cdb-b445-d1233c1b70a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpenseByNatureAbstract_45761b9c-9499-45db-99f2-0c9d75c8a19a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpenseByNatureAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_97dfd15d-464c-4740-a061-d289690a0e4c" xlink:to="loc_ifrs-full_ExpenseByNatureAbstract_45761b9c-9499-45db-99f2-0c9d75c8a19a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OperatingExpensesFromDisposalsWindDownsAcquisitionsAndRelatedCosts_5c95a10d-5545-42d1-a1f5-5e76973088a1" xlink:href="hsbc-20260630.xsd#hsbc_OperatingExpensesFromDisposalsWindDownsAcquisitionsAndRelatedCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ExpenseByNatureAbstract_45761b9c-9499-45db-99f2-0c9d75c8a19a" xlink:to="loc_hsbc_OperatingExpensesFromDisposalsWindDownsAcquisitionsAndRelatedCosts_5c95a10d-5545-42d1-a1f5-5e76973088a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpenseOfRestructuringActivities_d84816ee-bde4-40b8-87c8-1f79d818e4d8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpenseOfRestructuringActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ExpenseByNatureAbstract_45761b9c-9499-45db-99f2-0c9d75c8a19a" xlink:to="loc_ifrs-full_ExpenseOfRestructuringActivities_d84816ee-bde4-40b8-87c8-1f79d818e4d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ImpairmentLossRecognisedInProfitLossInterestInAssociates_0b66bb2b-da05-4a4c-a196-1f880bea3b45" xlink:href="hsbc-20260630.xsd#hsbc_ImpairmentLossRecognisedInProfitLossInterestInAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ExpenseByNatureAbstract_45761b9c-9499-45db-99f2-0c9d75c8a19a" xlink:to="loc_hsbc_ImpairmentLossRecognisedInProfitLossInterestInAssociates_0b66bb2b-da05-4a4c-a196-1f880bea3b45" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax_aab618e8-019a-4dbb-ade2-dc043128c589" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_97dfd15d-464c-4740-a061-d289690a0e4c" xlink:to="loc_ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax_aab618e8-019a-4dbb-ade2-dc043128c589" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation_52e611a4-3262-4ebc-8416-d308dd6fd309" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_97dfd15d-464c-4740-a061-d289690a0e4c" xlink:to="loc_ifrs-full_GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation_52e611a4-3262-4ebc-8416-d308dd6fd309" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughOtherReservesReclassifiedToIncomeStatementOnDisposalOfAForeignOperationEquity_8c8a7d2b-834f-46b0-9b3e-8573eaa135c0" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughOtherReservesReclassifiedToIncomeStatementOnDisposalOfAForeignOperationEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_97dfd15d-464c-4740-a061-d289690a0e4c" xlink:to="loc_hsbc_IncreaseDecreaseThroughOtherReservesReclassifiedToIncomeStatementOnDisposalOfAForeignOperationEquity_8c8a7d2b-834f-46b0-9b3e-8573eaa135c0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_019f1e16-bd00-76db-baff-f8898523f45e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_97dfd15d-464c-4740-a061-d289690a0e4c" xlink:to="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_019f1e16-bd00-76db-baff-f8898523f45e" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/FairvaluesoffinancialinstrumentscarriedatfairvalueFinancialinstrumentscarriedatfairvalueandbasesofvaluationDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#FairvaluesoffinancialinstrumentscarriedatfairvalueFinancialinstrumentscarriedatfairvalueandbasesofvaluationDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/FairvaluesoffinancialinstrumentscarriedatfairvalueFinancialinstrumentscarriedatfairvalueandbasesofvaluationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_79d2015b-87e2-4452-b7d1-6c9c558c2b73" xlink:href="hsbc-20260630.xsd#hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_e3a4f1fe-3eb9-44ad-be65-1092d185533d" xlink:href="hsbc-20260630.xsd#hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_79d2015b-87e2-4452-b7d1-6c9c558c2b73" xlink:to="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_e3a4f1fe-3eb9-44ad-be65-1092d185533d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementAxis_fc2aa07b-c3b7-4390-9c56-7e9749517133" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_e3a4f1fe-3eb9-44ad-be65-1092d185533d" xlink:to="loc_ifrs-full_MeasurementAxis_fc2aa07b-c3b7-4390-9c56-7e9749517133" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementDomain_fc2aa07b-c3b7-4390-9c56-7e9749517133_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MeasurementAxis_fc2aa07b-c3b7-4390-9c56-7e9749517133" xlink:to="loc_ifrs-full_MeasurementDomain_fc2aa07b-c3b7-4390-9c56-7e9749517133_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementDomain_2d20f0c4-2448-4528-b64c-1beba8763abd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MeasurementAxis_fc2aa07b-c3b7-4390-9c56-7e9749517133" xlink:to="loc_ifrs-full_MeasurementDomain_2d20f0c4-2448-4528-b64c-1beba8763abd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RecurringFairValueMeasurementMember_8f68e53f-0030-49c6-9bca-3d2ebef1287d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RecurringFairValueMeasurementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MeasurementDomain_2d20f0c4-2448-4528-b64c-1beba8763abd" xlink:to="loc_ifrs-full_RecurringFairValueMeasurementMember_8f68e53f-0030-49c6-9bca-3d2ebef1287d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_987324c1-2a5c-44e2-b27a-65ddb1ece921" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_e3a4f1fe-3eb9-44ad-be65-1092d185533d" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_987324c1-2a5c-44e2-b27a-65ddb1ece921" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_987324c1-2a5c-44e2-b27a-65ddb1ece921_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_987324c1-2a5c-44e2-b27a-65ddb1ece921" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_987324c1-2a5c-44e2-b27a-65ddb1ece921_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_180dc0cb-9dd9-4399-b653-474ae8906f13" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_987324c1-2a5c-44e2-b27a-65ddb1ece921" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_180dc0cb-9dd9-4399-b653-474ae8906f13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember_65f94f94-fbf2-4171-9f3c-40a59f3affb6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_180dc0cb-9dd9-4399-b653-474ae8906f13" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember_65f94f94-fbf2-4171-9f3c-40a59f3affb6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_35b067ff-1d9c-4beb-ab34-166ff42c3175" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_180dc0cb-9dd9-4399-b653-474ae8906f13" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_35b067ff-1d9c-4beb-ab34-166ff42c3175" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativesMember_6fea4483-fb63-4330-9ff1-f30dc272b2e5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_180dc0cb-9dd9-4399-b653-474ae8906f13" xlink:to="loc_ifrs-full_DerivativesMember_6fea4483-fb63-4330-9ff1-f30dc272b2e5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_e078df2f-4654-4c3e-aaae-ecb3b1c0c13d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_180dc0cb-9dd9-4399-b653-474ae8906f13" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_e078df2f-4654-4c3e-aaae-ecb3b1c0c13d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_747bdde3-2c6f-4ab6-80da-1cb4ebda83ba" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_e3a4f1fe-3eb9-44ad-be65-1092d185533d" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_747bdde3-2c6f-4ab6-80da-1cb4ebda83ba" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_747bdde3-2c6f-4ab6-80da-1cb4ebda83ba_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_747bdde3-2c6f-4ab6-80da-1cb4ebda83ba" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_747bdde3-2c6f-4ab6-80da-1cb4ebda83ba_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_f70fe606-659b-4380-be25-09b01bbfb674" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_747bdde3-2c6f-4ab6-80da-1cb4ebda83ba" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_f70fe606-659b-4380-be25-09b01bbfb674" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember_a1529f1b-6cd5-40a3-a4ed-31d3a0f57c3c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_f70fe606-659b-4380-be25-09b01bbfb674" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember_a1529f1b-6cd5-40a3-a4ed-31d3a0f57c3c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_f0eb4b2d-425e-4de2-b840-05da189339d7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_f70fe606-659b-4380-be25-09b01bbfb674" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_f0eb4b2d-425e-4de2-b840-05da189339d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativesMember_02ff10ad-f0ee-499e-b28d-31b2014e6a21" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_f70fe606-659b-4380-be25-09b01bbfb674" xlink:to="loc_ifrs-full_DerivativesMember_02ff10ad-f0ee-499e-b28d-31b2014e6a21" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_7c964ad4-2784-4f34-b8a0-388cc42566ca" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_e3a4f1fe-3eb9-44ad-be65-1092d185533d" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_7c964ad4-2784-4f34-b8a0-388cc42566ca" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_7c964ad4-2784-4f34-b8a0-388cc42566ca_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_7c964ad4-2784-4f34-b8a0-388cc42566ca" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_7c964ad4-2784-4f34-b8a0-388cc42566ca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_82b4f41d-5b6e-448d-b69d-318101f47fc4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_7c964ad4-2784-4f34-b8a0-388cc42566ca" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_82b4f41d-5b6e-448d-b69d-318101f47fc4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level1OfFairValueHierarchyMember_6f3fdc65-42c2-47e1-b86e-9b7ff246973d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level1OfFairValueHierarchyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_82b4f41d-5b6e-448d-b69d-318101f47fc4" xlink:to="loc_ifrs-full_Level1OfFairValueHierarchyMember_6f3fdc65-42c2-47e1-b86e-9b7ff246973d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level2OfFairValueHierarchyMember_a481adf7-d7ea-4baf-bf1d-2b41f18e6996" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level2OfFairValueHierarchyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_82b4f41d-5b6e-448d-b69d-318101f47fc4" xlink:to="loc_ifrs-full_Level2OfFairValueHierarchyMember_a481adf7-d7ea-4baf-bf1d-2b41f18e6996" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level3OfFairValueHierarchyMember_5d78929f-3140-4be8-b3b9-c43651ca504f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level3OfFairValueHierarchyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_82b4f41d-5b6e-448d-b69d-318101f47fc4" xlink:to="loc_ifrs-full_Level3OfFairValueHierarchyMember_5d78929f-3140-4be8-b3b9-c43651ca504f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_db50ad18-0cb7-4597-98f1-00152854602a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_e3a4f1fe-3eb9-44ad-be65-1092d185533d" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_db50ad18-0cb7-4597-98f1-00152854602a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_db50ad18-0cb7-4597-98f1-00152854602a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_db50ad18-0cb7-4597-98f1-00152854602a" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_db50ad18-0cb7-4597-98f1-00152854602a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_3ab16134-bd9a-49de-a8f5-46ba3c0ccafb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_db50ad18-0cb7-4597-98f1-00152854602a" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_3ab16134-bd9a-49de-a8f5-46ba3c0ccafb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember_3e536ec3-bd23-4fa9-be77-aa5ebf95c4bb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_3ab16134-bd9a-49de-a8f5-46ba3c0ccafb" xlink:to="loc_ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember_3e536ec3-bd23-4fa9-be77-aa5ebf95c4bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_cd541510-36ae-43cf-99e0-24d692a77d4a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_79d2015b-87e2-4452-b7d1-6c9c558c2b73" xlink:to="loc_ifrs-full_FinancialAssets_cd541510-36ae-43cf-99e0-24d692a77d4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilities_2749b117-f494-466b-8bb2-c1981711fd10" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_79d2015b-87e2-4452-b7d1-6c9c558c2b73" xlink:to="loc_ifrs-full_FinancialLiabilities_2749b117-f494-466b-8bb2-c1981711fd10" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/FairvaluesoffinancialinstrumentscarriedatfairvalueFinancialinstrumentsmeasuredatfairvalueusingavaluationtechniquewithsignificantunobservableinputsLevel3Details" xlink:type="simple" xlink:href="hsbc-20260630.xsd#FairvaluesoffinancialinstrumentscarriedatfairvalueFinancialinstrumentsmeasuredatfairvalueusingavaluationtechniquewithsignificantunobservableinputsLevel3Details"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/FairvaluesoffinancialinstrumentscarriedatfairvalueFinancialinstrumentsmeasuredatfairvalueusingavaluationtechniquewithsignificantunobservableinputsLevel3Details" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_b73164da-e5dc-464a-8feb-a47ffc81fc8b" xlink:href="hsbc-20260630.xsd#hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_43d0ec2a-1e97-49b9-9475-ec668dfd666b" xlink:href="hsbc-20260630.xsd#hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_b73164da-e5dc-464a-8feb-a47ffc81fc8b" xlink:to="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_43d0ec2a-1e97-49b9-9475-ec668dfd666b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementAxis_76fd7803-2b3b-437f-a4e5-7f9d249ac43b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_43d0ec2a-1e97-49b9-9475-ec668dfd666b" xlink:to="loc_ifrs-full_MeasurementAxis_76fd7803-2b3b-437f-a4e5-7f9d249ac43b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementDomain_76fd7803-2b3b-437f-a4e5-7f9d249ac43b_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MeasurementAxis_76fd7803-2b3b-437f-a4e5-7f9d249ac43b" xlink:to="loc_ifrs-full_MeasurementDomain_76fd7803-2b3b-437f-a4e5-7f9d249ac43b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementDomain_415c0a5f-2453-4016-ace5-665aee72dcad" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MeasurementAxis_76fd7803-2b3b-437f-a4e5-7f9d249ac43b" xlink:to="loc_ifrs-full_MeasurementDomain_415c0a5f-2453-4016-ace5-665aee72dcad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RecurringFairValueMeasurementMember_05a75fab-408c-454e-8f67-9972059403f7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RecurringFairValueMeasurementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MeasurementDomain_415c0a5f-2453-4016-ace5-665aee72dcad" xlink:to="loc_ifrs-full_RecurringFairValueMeasurementMember_05a75fab-408c-454e-8f67-9972059403f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_a7e5c0b1-9acf-4c54-adb8-a1cef74b34ed" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_43d0ec2a-1e97-49b9-9475-ec668dfd666b" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_a7e5c0b1-9acf-4c54-adb8-a1cef74b34ed" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_a7e5c0b1-9acf-4c54-adb8-a1cef74b34ed_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_a7e5c0b1-9acf-4c54-adb8-a1cef74b34ed" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_a7e5c0b1-9acf-4c54-adb8-a1cef74b34ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_0eb3f15f-ee9d-4587-94a6-d48df4d6e47d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_a7e5c0b1-9acf-4c54-adb8-a1cef74b34ed" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_0eb3f15f-ee9d-4587-94a6-d48df4d6e47d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level3OfFairValueHierarchyMember_41b68f3f-cf1c-4f27-9368-a3772ab304f5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level3OfFairValueHierarchyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_0eb3f15f-ee9d-4587-94a6-d48df4d6e47d" xlink:to="loc_ifrs-full_Level3OfFairValueHierarchyMember_41b68f3f-cf1c-4f27-9368-a3772ab304f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_6834d343-6e4b-4738-a9ce-ffe9026c6522" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_43d0ec2a-1e97-49b9-9475-ec668dfd666b" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_6834d343-6e4b-4738-a9ce-ffe9026c6522" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_6834d343-6e4b-4738-a9ce-ffe9026c6522_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_6834d343-6e4b-4738-a9ce-ffe9026c6522" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_6834d343-6e4b-4738-a9ce-ffe9026c6522_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_503f2e41-bd85-4d03-9066-3a19b8169958" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_6834d343-6e4b-4738-a9ce-ffe9026c6522" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_503f2e41-bd85-4d03-9066-3a19b8169958" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_9ce909d8-2829-402c-a67d-a37a8b5966a7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_503f2e41-bd85-4d03-9066-3a19b8169958" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_9ce909d8-2829-402c-a67d-a37a8b5966a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember_15d92d7c-0b1b-4423-9b56-32a4e229bf41" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_503f2e41-bd85-4d03-9066-3a19b8169958" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember_15d92d7c-0b1b-4423-9b56-32a4e229bf41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_45f0c8b6-127f-481d-86f6-129aa1b9989e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_503f2e41-bd85-4d03-9066-3a19b8169958" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_45f0c8b6-127f-481d-86f6-129aa1b9989e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativesMember_0539c454-ec1f-4c46-997d-0bbb929d2535" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_503f2e41-bd85-4d03-9066-3a19b8169958" xlink:to="loc_ifrs-full_DerivativesMember_0539c454-ec1f-4c46-997d-0bbb929d2535" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis_329da3c8-c495-44d7-abc4-20fdf016900c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_43d0ec2a-1e97-49b9-9475-ec668dfd666b" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsAxis_329da3c8-c495-44d7-abc4-20fdf016900c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_329da3c8-c495-44d7-abc4-20fdf016900c_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_329da3c8-c495-44d7-abc4-20fdf016900c" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_329da3c8-c495-44d7-abc4-20fdf016900c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_c852e0ed-1d19-48a0-9be1-be7c1708ef6e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_329da3c8-c495-44d7-abc4-20fdf016900c" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_c852e0ed-1d19-48a0-9be1-be7c1708ef6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherEquitySecuritiesMember_de846b50-068f-4e36-85fc-028b21779959" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_c852e0ed-1d19-48a0-9be1-be7c1708ef6e" xlink:to="loc_ifrs-full_OtherEquitySecuritiesMember_de846b50-068f-4e36-85fc-028b21779959" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_StructuredNotesLiabilitiesMember_a7dbfe9a-dd51-41b3-a261-8b5779d7fdd0" xlink:href="hsbc-20260630.xsd#hsbc_StructuredNotesLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_c852e0ed-1d19-48a0-9be1-be7c1708ef6e" xlink:to="loc_hsbc_StructuredNotesLiabilitiesMember_a7dbfe9a-dd51-41b3-a261-8b5779d7fdd0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDerivativesAssetsMember_019f471e-fa64-704c-b04a-bd4af45f6fc5" xlink:href="hsbc-20260630.xsd#hsbc_OtherDerivativesAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_c852e0ed-1d19-48a0-9be1-be7c1708ef6e" xlink:to="loc_hsbc_OtherDerivativesAssetsMember_019f471e-fa64-704c-b04a-bd4af45f6fc5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BondsAssetsMember_019f46af-192d-713c-b298-80d61935910b" xlink:href="hsbc-20260630.xsd#hsbc_BondsAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_c852e0ed-1d19-48a0-9be1-be7c1708ef6e" xlink:to="loc_hsbc_BondsAssetsMember_019f46af-192d-713c-b298-80d61935910b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansAssetsMember_019f46af-192d-72a3-a4ce-fbe125dd23d1" xlink:href="hsbc-20260630.xsd#hsbc_LoansAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_c852e0ed-1d19-48a0-9be1-be7c1708ef6e" xlink:to="loc_hsbc_LoansAssetsMember_019f46af-192d-72a3-a4ce-fbe125dd23d1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherPortfoliosAssetsMember_019f4721-a535-7cf0-8179-21bca894a2c6" xlink:href="hsbc-20260630.xsd#hsbc_OtherPortfoliosAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_c852e0ed-1d19-48a0-9be1-be7c1708ef6e" xlink:to="loc_hsbc_OtherPortfoliosAssetsMember_019f4721-a535-7cf0-8179-21bca894a2c6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_5bf426bc-ba0a-4576-b268-683f60184157" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_43d0ec2a-1e97-49b9-9475-ec668dfd666b" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_5bf426bc-ba0a-4576-b268-683f60184157" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_5bf426bc-ba0a-4576-b268-683f60184157_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_5bf426bc-ba0a-4576-b268-683f60184157" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_5bf426bc-ba0a-4576-b268-683f60184157_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_f642c38c-3c98-4f88-8ac6-1cc44e4b6dba" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_5bf426bc-ba0a-4576-b268-683f60184157" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_f642c38c-3c98-4f88-8ac6-1cc44e4b6dba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember_4772c367-9528-4587-9c04-fafcd14d46c2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_f642c38c-3c98-4f88-8ac6-1cc44e4b6dba" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember_4772c367-9528-4587-9c04-fafcd14d46c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_1b024e4a-3e9d-4d73-81e7-1c1fe98bf5cf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_f642c38c-3c98-4f88-8ac6-1cc44e4b6dba" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_1b024e4a-3e9d-4d73-81e7-1c1fe98bf5cf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativesMember_79dec255-7467-4bdc-a4b9-76eb85654bcc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_f642c38c-3c98-4f88-8ac6-1cc44e4b6dba" xlink:to="loc_ifrs-full_DerivativesMember_79dec255-7467-4bdc-a4b9-76eb85654bcc" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_03960c75-939b-46fb-b68d-244ef3dbb3a7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_43d0ec2a-1e97-49b9-9475-ec668dfd666b" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_03960c75-939b-46fb-b68d-244ef3dbb3a7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_03960c75-939b-46fb-b68d-244ef3dbb3a7_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_03960c75-939b-46fb-b68d-244ef3dbb3a7" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_03960c75-939b-46fb-b68d-244ef3dbb3a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_275cffa1-e158-4e8d-a141-23ccb226784a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_03960c75-939b-46fb-b68d-244ef3dbb3a7" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_275cffa1-e158-4e8d-a141-23ccb226784a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherEquitySecuritiesMember_cd5159c0-5108-4bd6-a6db-5796b9006968" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_275cffa1-e158-4e8d-a141-23ccb226784a" xlink:to="loc_ifrs-full_OtherEquitySecuritiesMember_cd5159c0-5108-4bd6-a6db-5796b9006968" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_StructuredNotesLiabilitiesMember_86d5e649-21c2-4352-ba2a-3677ae803f74" xlink:href="hsbc-20260630.xsd#hsbc_StructuredNotesLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_275cffa1-e158-4e8d-a141-23ccb226784a" xlink:to="loc_hsbc_StructuredNotesLiabilitiesMember_86d5e649-21c2-4352-ba2a-3677ae803f74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDerivativesLiabilitiesMember_9863f277-9476-41be-859a-2fad312d1f2a" xlink:href="hsbc-20260630.xsd#hsbc_OtherDerivativesLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_275cffa1-e158-4e8d-a141-23ccb226784a" xlink:to="loc_hsbc_OtherDerivativesLiabilitiesMember_9863f277-9476-41be-859a-2fad312d1f2a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BondsLiabilitiesMember_019f46af-192d-7a2e-8e8c-4de8a103ca94" xlink:href="hsbc-20260630.xsd#hsbc_BondsLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_275cffa1-e158-4e8d-a141-23ccb226784a" xlink:to="loc_hsbc_BondsLiabilitiesMember_019f46af-192d-7a2e-8e8c-4de8a103ca94" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansLiabilitiesMember_019f46af-192d-7c7c-a987-5fc879e8375a" xlink:href="hsbc-20260630.xsd#hsbc_LoansLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_275cffa1-e158-4e8d-a141-23ccb226784a" xlink:to="loc_hsbc_LoansLiabilitiesMember_019f46af-192d-7c7c-a987-5fc879e8375a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherPortfoliosLiabilitiesMember_4ea5836c-4a1c-420e-a559-14c34f70a75a" xlink:href="hsbc-20260630.xsd#hsbc_OtherPortfoliosLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_275cffa1-e158-4e8d-a141-23ccb226784a" xlink:to="loc_hsbc_OtherPortfoliosLiabilitiesMember_4ea5836c-4a1c-420e-a559-14c34f70a75a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_b2b08864-4c21-4036-9b52-47f6380e532d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_b73164da-e5dc-464a-8feb-a47ffc81fc8b" xlink:to="loc_ifrs-full_FinancialAssets_b2b08864-4c21-4036-9b52-47f6380e532d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilities_cd6c785f-eb35-4538-a08f-bcbe217bc9df" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_b73164da-e5dc-464a-8feb-a47ffc81fc8b" xlink:to="loc_ifrs-full_FinancialLiabilities_cd6c785f-eb35-4538-a08f-bcbe217bc9df" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/FairvaluesoffinancialinstrumentscarriedatfairvalueMovementinLevel3financialinstrumentsDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#FairvaluesoffinancialinstrumentscarriedatfairvalueMovementinLevel3financialinstrumentsDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/FairvaluesoffinancialinstrumentscarriedatfairvalueMovementinLevel3financialinstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_6bfc5ef2-4164-4017-a5d6-bafc114c90b5" xlink:href="hsbc-20260630.xsd#hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_056f1767-afea-4d91-a6a2-475ebf366bd2" xlink:href="hsbc-20260630.xsd#hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_6bfc5ef2-4164-4017-a5d6-bafc114c90b5" xlink:to="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_056f1767-afea-4d91-a6a2-475ebf366bd2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncomeStatementLocation1Axis_fd82fe58-420a-4a76-aac8-71be11050431" xlink:href="hsbc-20260630.xsd#hsbc_IncomeStatementLocation1Axis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_056f1767-afea-4d91-a6a2-475ebf366bd2" xlink:to="loc_hsbc_IncomeStatementLocation1Axis_fd82fe58-420a-4a76-aac8-71be11050431" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncomeStatementLocation1Domain_fd82fe58-420a-4a76-aac8-71be11050431_default" xlink:href="hsbc-20260630.xsd#hsbc_IncomeStatementLocation1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_IncomeStatementLocation1Axis_fd82fe58-420a-4a76-aac8-71be11050431" xlink:to="loc_hsbc_IncomeStatementLocation1Domain_fd82fe58-420a-4a76-aac8-71be11050431_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncomeStatementLocation1Domain_76ad4a81-4043-4b1f-972a-c62f9040ac53" xlink:href="hsbc-20260630.xsd#hsbc_IncomeStatementLocation1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_IncomeStatementLocation1Axis_fd82fe58-420a-4a76-aac8-71be11050431" xlink:to="loc_hsbc_IncomeStatementLocation1Domain_76ad4a81-4043-4b1f-972a-c62f9040ac53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NetIncomeFromFinancialInstrumentsHeldForTradingOrManagedOnAFairValueBasisMember_11c3ab59-e1e1-4d35-b945-bd8d57e3470e" xlink:href="hsbc-20260630.xsd#hsbc_NetIncomeFromFinancialInstrumentsHeldForTradingOrManagedOnAFairValueBasisMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IncomeStatementLocation1Domain_76ad4a81-4043-4b1f-972a-c62f9040ac53" xlink:to="loc_hsbc_NetIncomeFromFinancialInstrumentsHeldForTradingOrManagedOnAFairValueBasisMember_11c3ab59-e1e1-4d35-b945-bd8d57e3470e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NetIncomeFromAssetsAndLiabilitiesOfInsuranceBusinessesIncludingRelatedDerivativesMeasuredAtFairValueThroughProfitOrLossMember_21361888-2707-4606-944b-d1ab8649151a" xlink:href="hsbc-20260630.xsd#hsbc_NetIncomeFromAssetsAndLiabilitiesOfInsuranceBusinessesIncludingRelatedDerivativesMeasuredAtFairValueThroughProfitOrLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IncomeStatementLocation1Domain_76ad4a81-4043-4b1f-972a-c62f9040ac53" xlink:to="loc_hsbc_NetIncomeFromAssetsAndLiabilitiesOfInsuranceBusinessesIncludingRelatedDerivativesMeasuredAtFairValueThroughProfitOrLossMember_21361888-2707-4606-944b-d1ab8649151a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ChangesInFairValueOfOtherFinancialInstrumentsMandatorilyMeasuredAtFairValueThroughProfitOrLossMember_12bfb23e-d33c-47f0-a656-363f982ba811" xlink:href="hsbc-20260630.xsd#hsbc_ChangesInFairValueOfOtherFinancialInstrumentsMandatorilyMeasuredAtFairValueThroughProfitOrLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IncomeStatementLocation1Domain_76ad4a81-4043-4b1f-972a-c62f9040ac53" xlink:to="loc_hsbc_ChangesInFairValueOfOtherFinancialInstrumentsMandatorilyMeasuredAtFairValueThroughProfitOrLossMember_12bfb23e-d33c-47f0-a656-363f982ba811" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherIncomeLossMember_019fa3eb-0bdb-7088-a63b-9bdf58954eb9" xlink:href="hsbc-20260630.xsd#hsbc_OtherIncomeLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IncomeStatementLocation1Domain_76ad4a81-4043-4b1f-972a-c62f9040ac53" xlink:to="loc_hsbc_OtherIncomeLossMember_019fa3eb-0bdb-7088-a63b-9bdf58954eb9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_ffb0719f-3844-4651-a6c9-a72e5d4294ac" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_056f1767-afea-4d91-a6a2-475ebf366bd2" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_ffb0719f-3844-4651-a6c9-a72e5d4294ac" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_ffb0719f-3844-4651-a6c9-a72e5d4294ac_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_ffb0719f-3844-4651-a6c9-a72e5d4294ac" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_ffb0719f-3844-4651-a6c9-a72e5d4294ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_8f37790d-1d82-448c-b943-85e3980d028c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_ffb0719f-3844-4651-a6c9-a72e5d4294ac" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_8f37790d-1d82-448c-b943-85e3980d028c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_f924590d-76cc-4673-a8b8-49d5e8de8de6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_8f37790d-1d82-448c-b943-85e3980d028c" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_f924590d-76cc-4673-a8b8-49d5e8de8de6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember_7abc1988-79aa-41e7-81c6-914bce4ade6e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_8f37790d-1d82-448c-b943-85e3980d028c" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingCategoryMember_7abc1988-79aa-41e7-81c6-914bce4ade6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_5b5e24de-e435-42dd-b680-7c8db79d728c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_8f37790d-1d82-448c-b943-85e3980d028c" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_5b5e24de-e435-42dd-b680-7c8db79d728c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativesMember_3aea403e-2821-4761-ac3e-2cd4a4bcd689" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_8f37790d-1d82-448c-b943-85e3980d028c" xlink:to="loc_ifrs-full_DerivativesMember_3aea403e-2821-4761-ac3e-2cd4a4bcd689" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_208f529e-e2f6-4120-b782-3dd805acde47" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_056f1767-afea-4d91-a6a2-475ebf366bd2" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_208f529e-e2f6-4120-b782-3dd805acde47" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_208f529e-e2f6-4120-b782-3dd805acde47_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_208f529e-e2f6-4120-b782-3dd805acde47" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_208f529e-e2f6-4120-b782-3dd805acde47_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_7cf734ae-501d-4220-87b5-fc43b16e0e34" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_208f529e-e2f6-4120-b782-3dd805acde47" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_7cf734ae-501d-4220-87b5-fc43b16e0e34" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember_0583b921-9225-4735-b1b2-033b4250de37" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_7cf734ae-501d-4220-87b5-fc43b16e0e34" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossThatMeetDefinitionOfHeldForTradingCategoryMember_0583b921-9225-4735-b1b2-033b4250de37" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_db164ac9-19dc-4958-b4f7-7e2ad2df4971" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_7cf734ae-501d-4220-87b5-fc43b16e0e34" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_db164ac9-19dc-4958-b4f7-7e2ad2df4971" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativesMember_bc916ca5-c670-4bf9-899a-977c83e3059b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_7cf734ae-501d-4220-87b5-fc43b16e0e34" xlink:to="loc_ifrs-full_DerivativesMember_bc916ca5-c670-4bf9-899a-977c83e3059b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_432bc683-2b52-4727-8b07-f34cf3400a70" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_056f1767-afea-4d91-a6a2-475ebf366bd2" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_432bc683-2b52-4727-8b07-f34cf3400a70" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_432bc683-2b52-4727-8b07-f34cf3400a70_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_432bc683-2b52-4727-8b07-f34cf3400a70" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_432bc683-2b52-4727-8b07-f34cf3400a70_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_f13109b5-54f9-4602-8085-d245746089d7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_432bc683-2b52-4727-8b07-f34cf3400a70" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_f13109b5-54f9-4602-8085-d245746089d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level3OfFairValueHierarchyMember_658859d6-1a95-4ad2-add6-94e9a861a724" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level3OfFairValueHierarchyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_f13109b5-54f9-4602-8085-d245746089d7" xlink:to="loc_ifrs-full_Level3OfFairValueHierarchyMember_658859d6-1a95-4ad2-add6-94e9a861a724" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementAxis_fa8ac8ee-5ac4-44e8-b76b-ee6f123cb169" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_056f1767-afea-4d91-a6a2-475ebf366bd2" xlink:to="loc_ifrs-full_MeasurementAxis_fa8ac8ee-5ac4-44e8-b76b-ee6f123cb169" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementDomain_fa8ac8ee-5ac4-44e8-b76b-ee6f123cb169_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MeasurementAxis_fa8ac8ee-5ac4-44e8-b76b-ee6f123cb169" xlink:to="loc_ifrs-full_MeasurementDomain_fa8ac8ee-5ac4-44e8-b76b-ee6f123cb169_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementDomain_23edaa30-565b-4ede-a221-70c176bdf3a8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MeasurementAxis_fa8ac8ee-5ac4-44e8-b76b-ee6f123cb169" xlink:to="loc_ifrs-full_MeasurementDomain_23edaa30-565b-4ede-a221-70c176bdf3a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RecurringFairValueMeasurementMember_85df603c-448f-47c5-acf5-d278db3443b7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RecurringFairValueMeasurementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MeasurementDomain_23edaa30-565b-4ede-a221-70c176bdf3a8" xlink:to="loc_ifrs-full_RecurringFairValueMeasurementMember_85df603c-448f-47c5-acf5-d278db3443b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract_5bc9441f-7d46-45dc-9900-226a09936cd7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_6bfc5ef2-4164-4017-a5d6-bafc114c90b5" xlink:to="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract_5bc9441f-7d46-45dc-9900-226a09936cd7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_f38aaf30-623b-45d7-b67b-1b0f0af49b3a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract_5bc9441f-7d46-45dc-9900-226a09936cd7" xlink:to="loc_ifrs-full_FinancialAssets_f38aaf30-623b-45d7-b67b-1b0f0af49b3a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssets_ce4d6f8e-88f4-4f48-ba96-35054ebaf7a6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract_5bc9441f-7d46-45dc-9900-226a09936cd7" xlink:to="loc_ifrs-full_GainsLossesRecognisedInProfitOrLossFairValueMeasurementAssets_ce4d6f8e-88f4-4f48-ba96-35054ebaf7a6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementAssets_5c023556-d76a-4b11-ad16-67470621d648" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract_5bc9441f-7d46-45dc-9900-226a09936cd7" xlink:to="loc_ifrs-full_GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementAssets_5c023556-d76a-4b11-ad16-67470621d648" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchasesFairValueMeasurementAssets_becfa1bf-f43e-45b8-9205-3c228883b412" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchasesFairValueMeasurementAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract_5bc9441f-7d46-45dc-9900-226a09936cd7" xlink:to="loc_ifrs-full_PurchasesFairValueMeasurementAssets_becfa1bf-f43e-45b8-9205-3c228883b412" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuesFairValueMeasurementAssets_6def8a92-fe67-45e4-88ae-fb9642302bdc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuesFairValueMeasurementAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract_5bc9441f-7d46-45dc-9900-226a09936cd7" xlink:to="loc_ifrs-full_IssuesFairValueMeasurementAssets_6def8a92-fe67-45e4-88ae-fb9642302bdc" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SalesFairValueMeasurementAssets_248357e0-12c5-48e0-8c47-b1cfd0159f44" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SalesFairValueMeasurementAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract_5bc9441f-7d46-45dc-9900-226a09936cd7" xlink:to="loc_ifrs-full_SalesFairValueMeasurementAssets_248357e0-12c5-48e0-8c47-b1cfd0159f44" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SettlementsFairValueMeasurementAssets_91c4a22c-3cd4-4813-8594-5d269d0714e9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SettlementsFairValueMeasurementAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract_5bc9441f-7d46-45dc-9900-226a09936cd7" xlink:to="loc_ifrs-full_SettlementsFairValueMeasurementAssets_91c4a22c-3cd4-4813-8594-5d269d0714e9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TransfersOutOfLevel3OfFairValueHierarchyAssets_1dab722b-6f70-4403-aff4-b5e56a1a9837" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TransfersOutOfLevel3OfFairValueHierarchyAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract_5bc9441f-7d46-45dc-9900-226a09936cd7" xlink:to="loc_ifrs-full_TransfersOutOfLevel3OfFairValueHierarchyAssets_1dab722b-6f70-4403-aff4-b5e56a1a9837" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TransfersIntoLevel3OfFairValueHierarchyAssets_e137f346-9e93-4524-926d-a9cd483746ff" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TransfersIntoLevel3OfFairValueHierarchyAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementAssetsAbstract_5bc9441f-7d46-45dc-9900-226a09936cd7" xlink:to="loc_ifrs-full_TransfersIntoLevel3OfFairValueHierarchyAssets_e137f346-9e93-4524-926d-a9cd483746ff" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_a9294ae5-be9b-4b0d-b89a-b498a1fa19f9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForAssetsHeldAtEndOfPeriodFairValueMeasurement_b0821a8d-2cc8-4d0a-b324-1c511e28fc30" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForAssetsHeldAtEndOfPeriodFairValueMeasurement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_6bfc5ef2-4164-4017-a5d6-bafc114c90b5" xlink:to="loc_ifrs-full_GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForAssetsHeldAtEndOfPeriodFairValueMeasurement_b0821a8d-2cc8-4d0a-b324-1c511e28fc30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementLiabilitiesAbstract_ecd93998-9230-4f9c-9441-14684e728e3f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReconciliationOfChangesInFairValueMeasurementLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_6bfc5ef2-4164-4017-a5d6-bafc114c90b5" xlink:to="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementLiabilitiesAbstract_ecd93998-9230-4f9c-9441-14684e728e3f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilities_db151ecc-1713-41f2-822e-649a0a5b4fbf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementLiabilitiesAbstract_ecd93998-9230-4f9c-9441-14684e728e3f" xlink:to="loc_ifrs-full_FinancialLiabilities_db151ecc-1713-41f2-822e-649a0a5b4fbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesRecognisedInProfitOrLossFairValueMeasurementLiabilities_4ff786c6-b5e3-4f31-86df-0a5a6a173013" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesRecognisedInProfitOrLossFairValueMeasurementLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementLiabilitiesAbstract_ecd93998-9230-4f9c-9441-14684e728e3f" xlink:to="loc_ifrs-full_GainsLossesRecognisedInProfitOrLossFairValueMeasurementLiabilities_4ff786c6-b5e3-4f31-86df-0a5a6a173013" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementLiabilities_273f650b-b6e2-4e4b-af0f-6c78865ad095" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementLiabilitiesAbstract_ecd93998-9230-4f9c-9441-14684e728e3f" xlink:to="loc_ifrs-full_GainsLossesRecognisedInOtherComprehensiveIncomeFairValueMeasurementLiabilities_273f650b-b6e2-4e4b-af0f-6c78865ad095" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchasesFairValueMeasurementLiabilities_23f60291-aaef-4ffc-a21e-c44491adf78b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchasesFairValueMeasurementLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementLiabilitiesAbstract_ecd93998-9230-4f9c-9441-14684e728e3f" xlink:to="loc_ifrs-full_PurchasesFairValueMeasurementLiabilities_23f60291-aaef-4ffc-a21e-c44491adf78b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuesFairValueMeasurementLiabilities_ce9553d9-d083-46e7-9493-f73854533da1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuesFairValueMeasurementLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementLiabilitiesAbstract_ecd93998-9230-4f9c-9441-14684e728e3f" xlink:to="loc_ifrs-full_IssuesFairValueMeasurementLiabilities_ce9553d9-d083-46e7-9493-f73854533da1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SalesFairValueMeasurementLiabilities_1d82abac-77a2-4ad9-b6c5-734b47418bae" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SalesFairValueMeasurementLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementLiabilitiesAbstract_ecd93998-9230-4f9c-9441-14684e728e3f" xlink:to="loc_ifrs-full_SalesFairValueMeasurementLiabilities_1d82abac-77a2-4ad9-b6c5-734b47418bae" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SettlementsFairValueMeasurementLiabilities_ef3bd934-7a8a-49de-aafe-1408358b24f4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SettlementsFairValueMeasurementLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementLiabilitiesAbstract_ecd93998-9230-4f9c-9441-14684e728e3f" xlink:to="loc_ifrs-full_SettlementsFairValueMeasurementLiabilities_ef3bd934-7a8a-49de-aafe-1408358b24f4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TransfersOutOfLevel3OfFairValueHierarchyLiabilities_f4c0073b-8c2e-4ca0-a053-dfc50185e93b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TransfersOutOfLevel3OfFairValueHierarchyLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementLiabilitiesAbstract_ecd93998-9230-4f9c-9441-14684e728e3f" xlink:to="loc_ifrs-full_TransfersOutOfLevel3OfFairValueHierarchyLiabilities_f4c0073b-8c2e-4ca0-a053-dfc50185e93b" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TransfersIntoLevel3OfFairValueHierarchyLiabilities_6b2fd3c6-2a4c-4d03-b2ed-16db8529f133" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TransfersIntoLevel3OfFairValueHierarchyLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInFairValueMeasurementLiabilitiesAbstract_ecd93998-9230-4f9c-9441-14684e728e3f" xlink:to="loc_ifrs-full_TransfersIntoLevel3OfFairValueHierarchyLiabilities_6b2fd3c6-2a4c-4d03-b2ed-16db8529f133" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilities_0e8912a4-11e9-4d96-ba87-795d0a87348e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilities"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForLiabilitiesHeldAtEndOfPeriodFairValueMeasurement_8c969ba6-d3c1-4288-a2a2-350687c34f1d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForLiabilitiesHeldAtEndOfPeriodFairValueMeasurement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_6bfc5ef2-4164-4017-a5d6-bafc114c90b5" xlink:to="loc_ifrs-full_GainsLossesRecognisedInProfitOrLossAttributableToChangeInUnrealisedGainsOrLossesForLiabilitiesHeldAtEndOfPeriodFairValueMeasurement_8c969ba6-d3c1-4288-a2a2-350687c34f1d" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/FairvaluesoffinancialinstrumentscarriedatfairvalueSensitivityofLevel3fairvaluestoreasonablypossiblealternativeassumptionsDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#FairvaluesoffinancialinstrumentscarriedatfairvalueSensitivityofLevel3fairvaluestoreasonablypossiblealternativeassumptionsDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/FairvaluesoffinancialinstrumentscarriedatfairvalueSensitivityofLevel3fairvaluestoreasonablypossiblealternativeassumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_99e12336-bf16-4719-8222-c6f14a5a1c5d" xlink:href="hsbc-20260630.xsd#hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_2f3a4e83-0c61-47cd-bc69-89da97d313e7" xlink:href="hsbc-20260630.xsd#hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_99e12336-bf16-4719-8222-c6f14a5a1c5d" xlink:to="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_2f3a4e83-0c61-47cd-bc69-89da97d313e7" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_6790aba1-0485-44dd-a6fb-81e75b1c9f36" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_2f3a4e83-0c61-47cd-bc69-89da97d313e7" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_6790aba1-0485-44dd-a6fb-81e75b1c9f36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_6790aba1-0485-44dd-a6fb-81e75b1c9f36_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_6790aba1-0485-44dd-a6fb-81e75b1c9f36" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_6790aba1-0485-44dd-a6fb-81e75b1c9f36_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_ced994af-6fe5-4e9c-8525-ea4a28d8bd2f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_6790aba1-0485-44dd-a6fb-81e75b1c9f36" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_ced994af-6fe5-4e9c-8525-ea4a28d8bd2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingAndDerivativesMember_4f1735b0-a9dc-4607-8b15-88f1ccd4386f" xlink:href="hsbc-20260630.xsd#hsbc_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingAndDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_ced994af-6fe5-4e9c-8525-ea4a28d8bd2f" xlink:to="loc_hsbc_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingAndDerivativesMember_4f1735b0-a9dc-4607-8b15-88f1ccd4386f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_b3adede5-7138-492d-adf9-c97cfc1e10d0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_ced994af-6fe5-4e9c-8525-ea4a28d8bd2f" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_b3adede5-7138-492d-adf9-c97cfc1e10d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_7aff4ea9-af49-413a-be1d-68335ea46826" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_ced994af-6fe5-4e9c-8525-ea4a28d8bd2f" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_7aff4ea9-af49-413a-be1d-68335ea46826" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_8671094f-62c5-408c-919a-20cf2df6073c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_2f3a4e83-0c61-47cd-bc69-89da97d313e7" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_8671094f-62c5-408c-919a-20cf2df6073c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_8671094f-62c5-408c-919a-20cf2df6073c_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_8671094f-62c5-408c-919a-20cf2df6073c" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_8671094f-62c5-408c-919a-20cf2df6073c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_933cfe51-e98d-4741-9c3f-0bbe618979c3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_8671094f-62c5-408c-919a-20cf2df6073c" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_933cfe51-e98d-4741-9c3f-0bbe618979c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingAndDerivativesMember_6878e9fc-e0d7-4e0d-a261-b32d56bac158" xlink:href="hsbc-20260630.xsd#hsbc_FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingAndDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_933cfe51-e98d-4741-9c3f-0bbe618979c3" xlink:to="loc_hsbc_FinancialLiabilitiesAtFairValueThroughProfitOrLossClassifiedAsHeldForTradingAndDerivativesMember_6878e9fc-e0d7-4e0d-a261-b32d56bac158" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_a2e7b249-9a6e-40aa-ad15-b115b2a14f5a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_933cfe51-e98d-4741-9c3f-0bbe618979c3" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedUponInitialRecognitionCategoryMember_a2e7b249-9a6e-40aa-ad15-b115b2a14f5a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_GainLossRecognizedInProfitOrLossDueToFavourableChangesInSignificantUnobservableInputs_a9f0ba7c-3544-4e5f-b082-0597f6430511" xlink:href="hsbc-20260630.xsd#hsbc_GainLossRecognizedInProfitOrLossDueToFavourableChangesInSignificantUnobservableInputs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_99e12336-bf16-4719-8222-c6f14a5a1c5d" xlink:to="loc_hsbc_GainLossRecognizedInProfitOrLossDueToFavourableChangesInSignificantUnobservableInputs_a9f0ba7c-3544-4e5f-b082-0597f6430511" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_GainLossRecognizedInProfitOrLossDueToUnfavourableChangesInSignificantUnobservableInputs_eebf700f-d3c1-4ede-8791-fe0d7d9d9489" xlink:href="hsbc-20260630.xsd#hsbc_GainLossRecognizedInProfitOrLossDueToUnfavourableChangesInSignificantUnobservableInputs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_99e12336-bf16-4719-8222-c6f14a5a1c5d" xlink:to="loc_hsbc_GainLossRecognizedInProfitOrLossDueToUnfavourableChangesInSignificantUnobservableInputs_eebf700f-d3c1-4ede-8791-fe0d7d9d9489" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_GainLossRecognizedInOtherComprehensiveIncomeDueToFavourableChangesInSignificantUnobservableInputs_5064408f-22f5-463b-9788-9660b1631c07" xlink:href="hsbc-20260630.xsd#hsbc_GainLossRecognizedInOtherComprehensiveIncomeDueToFavourableChangesInSignificantUnobservableInputs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_99e12336-bf16-4719-8222-c6f14a5a1c5d" xlink:to="loc_hsbc_GainLossRecognizedInOtherComprehensiveIncomeDueToFavourableChangesInSignificantUnobservableInputs_5064408f-22f5-463b-9788-9660b1631c07" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_GainLossRecognizedInOtherComprehensiveIncomeDueToUnfavourableChangesInSignificantUnobservableInputs_78cd309e-6c1b-4e4b-88b5-48f4020ee6d3" xlink:href="hsbc-20260630.xsd#hsbc_GainLossRecognizedInOtherComprehensiveIncomeDueToUnfavourableChangesInSignificantUnobservableInputs"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_99e12336-bf16-4719-8222-c6f14a5a1c5d" xlink:to="loc_hsbc_GainLossRecognizedInOtherComprehensiveIncomeDueToUnfavourableChangesInSignificantUnobservableInputs_78cd309e-6c1b-4e4b-88b5-48f4020ee6d3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NumberOfFinancialInstrumentCategories_f5d6cd25-6961-4f30-80bd-c34773c66528" xlink:href="hsbc-20260630.xsd#hsbc_NumberOfFinancialInstrumentCategories"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_99e12336-bf16-4719-8222-c6f14a5a1c5d" xlink:to="loc_hsbc_NumberOfFinancialInstrumentCategories_f5d6cd25-6961-4f30-80bd-c34773c66528" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ConfidenceLevelCorrespondingToResultsOfTechniqueOtherThanConfidenceLevelTechniqueUsedForDeterminingRiskAdjustmentForNonfinancialRisk_9d0df4b7-a0d3-4d76-9ac2-f76d088591bb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ConfidenceLevelCorrespondingToResultsOfTechniqueOtherThanConfidenceLevelTechniqueUsedForDeterminingRiskAdjustmentForNonfinancialRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_99e12336-bf16-4719-8222-c6f14a5a1c5d" xlink:to="loc_ifrs-full_ConfidenceLevelCorrespondingToResultsOfTechniqueOtherThanConfidenceLevelTechniqueUsedForDeterminingRiskAdjustmentForNonfinancialRisk_9d0df4b7-a0d3-4d76-9ac2-f76d088591bb" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/FairvaluesoffinancialinstrumentscarriedatfairvalueQuantitativeinformationaboutsignificantunobservableinputsinLevel3valuationsDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#FairvaluesoffinancialinstrumentscarriedatfairvalueQuantitativeinformationaboutsignificantunobservableinputsinLevel3valuationsDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/FairvaluesoffinancialinstrumentscarriedatfairvalueQuantitativeinformationaboutsignificantunobservableinputsinLevel3valuationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_cc8e3d48-d3d4-4f8f-8c0f-0da36c5f981f" xlink:href="hsbc-20260630.xsd#hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_906ddf15-88e0-4656-b1c0-5a48f97753d8" xlink:href="hsbc-20260630.xsd#hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_cc8e3d48-d3d4-4f8f-8c0f-0da36c5f981f" xlink:to="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_906ddf15-88e0-4656-b1c0-5a48f97753d8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_e9454a6f-9efe-457d-a815-230a6508cf45" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_906ddf15-88e0-4656-b1c0-5a48f97753d8" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_e9454a6f-9efe-457d-a815-230a6508cf45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_e9454a6f-9efe-457d-a815-230a6508cf45_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_e9454a6f-9efe-457d-a815-230a6508cf45" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_e9454a6f-9efe-457d-a815-230a6508cf45_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_49be7014-734c-453d-b1da-34aebd2b5000" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LevelsOfFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_e9454a6f-9efe-457d-a815-230a6508cf45" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_49be7014-734c-453d-b1da-34aebd2b5000" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level3OfFairValueHierarchyMember_7aa1634a-df99-48e4-8f83-537a6c780607" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Level3OfFairValueHierarchyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_49be7014-734c-453d-b1da-34aebd2b5000" xlink:to="loc_ifrs-full_Level3OfFairValueHierarchyMember_7aa1634a-df99-48e4-8f83-537a6c780607" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementAxis_b3914876-4a89-4f10-9763-fc3bb9f94d82" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_906ddf15-88e0-4656-b1c0-5a48f97753d8" xlink:to="loc_ifrs-full_MeasurementAxis_b3914876-4a89-4f10-9763-fc3bb9f94d82" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementDomain_b3914876-4a89-4f10-9763-fc3bb9f94d82_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MeasurementAxis_b3914876-4a89-4f10-9763-fc3bb9f94d82" xlink:to="loc_ifrs-full_MeasurementDomain_b3914876-4a89-4f10-9763-fc3bb9f94d82_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementDomain_992df50a-0499-43c9-9fd4-0739303e3e25" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MeasurementAxis_b3914876-4a89-4f10-9763-fc3bb9f94d82" xlink:to="loc_ifrs-full_MeasurementDomain_992df50a-0499-43c9-9fd4-0739303e3e25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RecurringFairValueMeasurementMember_b6234a1b-3676-4996-9d72-6348e9bf5ff2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RecurringFairValueMeasurementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MeasurementDomain_992df50a-0499-43c9-9fd4-0739303e3e25" xlink:to="loc_ifrs-full_RecurringFairValueMeasurementMember_b6234a1b-3676-4996-9d72-6348e9bf5ff2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeAxis_87befc3c-2b99-4294-8dbc-ac516ffe370c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_906ddf15-88e0-4656-b1c0-5a48f97753d8" xlink:to="loc_ifrs-full_RangeAxis_87befc3c-2b99-4294-8dbc-ac516ffe370c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_87befc3c-2b99-4294-8dbc-ac516ffe370c_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_87befc3c-2b99-4294-8dbc-ac516ffe370c" xlink:to="loc_ifrs-full_RangeDomain_87befc3c-2b99-4294-8dbc-ac516ffe370c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_e6e2892e-ebe7-49a8-8fe1-6a4834241ede" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_87befc3c-2b99-4294-8dbc-ac516ffe370c" xlink:to="loc_ifrs-full_RangeDomain_e6e2892e-ebe7-49a8-8fe1-6a4834241ede" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BottomOfRangeMember_3ef21cc0-6f81-4b2a-b988-13c42b9e9fdb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_e6e2892e-ebe7-49a8-8fe1-6a4834241ede" xlink:to="loc_ifrs-full_BottomOfRangeMember_3ef21cc0-6f81-4b2a-b988-13c42b9e9fdb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TopOfRangeMember_6375acc3-62f7-4fd4-962e-72622e54f8b6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_e6e2892e-ebe7-49a8-8fe1-6a4834241ede" xlink:to="loc_ifrs-full_TopOfRangeMember_6375acc3-62f7-4fd4-962e-72622e54f8b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UnobservableInputsAxis_17c68ad1-3bdd-408b-9821-7aa3c6578621" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnobservableInputsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_906ddf15-88e0-4656-b1c0-5a48f97753d8" xlink:to="loc_ifrs-full_UnobservableInputsAxis_17c68ad1-3bdd-408b-9821-7aa3c6578621" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UnobservableInputsDomain_17c68ad1-3bdd-408b-9821-7aa3c6578621_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnobservableInputsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_UnobservableInputsAxis_17c68ad1-3bdd-408b-9821-7aa3c6578621" xlink:to="loc_ifrs-full_UnobservableInputsDomain_17c68ad1-3bdd-408b-9821-7aa3c6578621_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UnobservableInputsDomain_1c3366ad-a805-4882-9015-e514b3a903b0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnobservableInputsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_UnobservableInputsAxis_17c68ad1-3bdd-408b-9821-7aa3c6578621" xlink:to="loc_ifrs-full_UnobservableInputsDomain_1c3366ad-a805-4882-9015-e514b3a903b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentEstimateOfFutureCashOutflowsToBePaidToFulfilObligationMeasurementInputMember_82faa446-3264-425b-8442-4766254ae1b3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentEstimateOfFutureCashOutflowsToBePaidToFulfilObligationMeasurementInputMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_UnobservableInputsDomain_1c3366ad-a805-4882-9015-e514b3a903b0" xlink:to="loc_ifrs-full_CurrentEstimateOfFutureCashOutflowsToBePaidToFulfilObligationMeasurementInputMember_82faa446-3264-425b-8442-4766254ae1b3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_HistoricalVolatilityForSharesMeasurementInputMember_390ada34-3c9d-4759-90d0-731c4a17c842" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_HistoricalVolatilityForSharesMeasurementInputMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_UnobservableInputsDomain_1c3366ad-a805-4882-9015-e514b3a903b0" xlink:to="loc_ifrs-full_HistoricalVolatilityForSharesMeasurementInputMember_390ada34-3c9d-4759-90d0-731c4a17c842" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_EquityCorrelationMeasurementInputMember_45e4714d-1047-4649-946f-63b068bf314c" xlink:href="hsbc-20260630.xsd#hsbc_EquityCorrelationMeasurementInputMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_UnobservableInputsDomain_1c3366ad-a805-4882-9015-e514b3a903b0" xlink:to="loc_hsbc_EquityCorrelationMeasurementInputMember_45e4714d-1047-4649-946f-63b068bf314c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ForeignExchangeVolatilityMeasurementInputMember_10ac7773-a7d2-465f-8bc2-f77b012a92de" xlink:href="hsbc-20260630.xsd#hsbc_ForeignExchangeVolatilityMeasurementInputMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_UnobservableInputsDomain_1c3366ad-a805-4882-9015-e514b3a903b0" xlink:to="loc_hsbc_ForeignExchangeVolatilityMeasurementInputMember_10ac7773-a7d2-465f-8bc2-f77b012a92de" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ConstantPrepaymentRateMeasurementInputMember_09ed2648-05cb-46cc-8d37-baf93d23c031" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ConstantPrepaymentRateMeasurementInputMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_UnobservableInputsDomain_1c3366ad-a805-4882-9015-e514b3a903b0" xlink:to="loc_ifrs-full_ConstantPrepaymentRateMeasurementInputMember_09ed2648-05cb-46cc-8d37-baf93d23c031" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestRateMeasurementInputMember_e413da2a-c401-4ce5-a7a1-602b7140ad34" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRateMeasurementInputMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_UnobservableInputsDomain_1c3366ad-a805-4882-9015-e514b3a903b0" xlink:to="loc_ifrs-full_InterestRateMeasurementInputMember_e413da2a-c401-4ce5-a7a1-602b7140ad34" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_PricesMeasurementInputMember_b4d6ef94-f0a0-4d2d-a185-b3e7df6aebe7" xlink:href="hsbc-20260630.xsd#hsbc_PricesMeasurementInputMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_UnobservableInputsDomain_1c3366ad-a805-4882-9015-e514b3a903b0" xlink:to="loc_hsbc_PricesMeasurementInputMember_b4d6ef94-f0a0-4d2d-a185-b3e7df6aebe7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementAxis_27b91bd0-1b24-4c67-ab1a-f3ca5b02402b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ValuationTechniquesUsedInFairValueMeasurementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_906ddf15-88e0-4656-b1c0-5a48f97753d8" xlink:to="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementAxis_27b91bd0-1b24-4c67-ab1a-f3ca5b02402b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain_27b91bd0-1b24-4c67-ab1a-f3ca5b02402b_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementAxis_27b91bd0-1b24-4c67-ab1a-f3ca5b02402b" xlink:to="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain_27b91bd0-1b24-4c67-ab1a-f3ca5b02402b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain_5bcc50c7-7bf5-45e6-b306-56b8af8e1c73" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementAxis_27b91bd0-1b24-4c67-ab1a-f3ca5b02402b" xlink:to="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain_5bcc50c7-7bf5-45e6-b306-56b8af8e1c73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NetAssetValueMember_4d693e22-5fd0-431b-94ff-1bba9245f75c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NetAssetValueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain_5bcc50c7-7bf5-45e6-b306-56b8af8e1c73" xlink:to="loc_ifrs-full_NetAssetValueMember_4d693e22-5fd0-431b-94ff-1bba9245f75c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OptionPricingModelMember_0fc98043-26da-478d-a7df-6fd37a9258d3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OptionPricingModelMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain_5bcc50c7-7bf5-45e6-b306-56b8af8e1c73" xlink:to="loc_ifrs-full_OptionPricingModelMember_0fc98043-26da-478d-a7df-6fd37a9258d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DiscountedCashFlowMember_d3ba7485-b790-48be-bc86-f9cba6afb6c5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DiscountedCashFlowMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain_5bcc50c7-7bf5-45e6-b306-56b8af8e1c73" xlink:to="loc_ifrs-full_DiscountedCashFlowMember_d3ba7485-b790-48be-bc86-f9cba6afb6c5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MarketComparableCompaniesMember_04aae2ac-fd95-437e-9847-cc05a3a71b8d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MarketComparableCompaniesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain_5bcc50c7-7bf5-45e6-b306-56b8af8e1c73" xlink:to="loc_ifrs-full_MarketComparableCompaniesMember_04aae2ac-fd95-437e-9847-cc05a3a71b8d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis_9607dd4e-4ac0-40d9-acd6-d66a139afa16" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_906ddf15-88e0-4656-b1c0-5a48f97753d8" xlink:to="loc_ifrs-full_TypesOfRisksAxis_9607dd4e-4ac0-40d9-acd6-d66a139afa16" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_9607dd4e-4ac0-40d9-acd6-d66a139afa16_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_9607dd4e-4ac0-40d9-acd6-d66a139afa16" xlink:to="loc_ifrs-full_TypesOfRisksDomain_9607dd4e-4ac0-40d9-acd6-d66a139afa16_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_b4ad5a79-9548-4b8a-9471-11aadcf2ba32" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_9607dd4e-4ac0-40d9-acd6-d66a139afa16" xlink:to="loc_ifrs-full_TypesOfRisksDomain_b4ad5a79-9548-4b8a-9471-11aadcf2ba32" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestRateRiskMember_e237d2e6-bb07-44b2-8fb6-22e196ad9405" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRateRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_b4ad5a79-9548-4b8a-9471-11aadcf2ba32" xlink:to="loc_ifrs-full_InterestRateRiskMember_e237d2e6-bb07-44b2-8fb6-22e196ad9405" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrencyRiskMember_952a2973-2741-4117-924a-35ec017ad23a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrencyRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_b4ad5a79-9548-4b8a-9471-11aadcf2ba32" xlink:to="loc_ifrs-full_CurrencyRiskMember_952a2973-2741-4117-924a-35ec017ad23a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityPriceRiskMember_14d75118-555d-4d0a-b16c-bbf714bc3bb3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityPriceRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_b4ad5a79-9548-4b8a-9471-11aadcf2ba32" xlink:to="loc_ifrs-full_EquityPriceRiskMember_14d75118-555d-4d0a-b16c-bbf714bc3bb3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditRiskMember_06b85f49-debc-492a-af76-b66dc5fcb11e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_b4ad5a79-9548-4b8a-9471-11aadcf2ba32" xlink:to="loc_ifrs-full_CreditRiskMember_06b85f49-debc-492a-af76-b66dc5fcb11e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherRiskMember_55a37d2b-5c3b-4466-8e19-d64236e2de66" xlink:href="hsbc-20260630.xsd#hsbc_OtherRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_b4ad5a79-9548-4b8a-9471-11aadcf2ba32" xlink:to="loc_hsbc_OtherRiskMember_55a37d2b-5c3b-4466-8e19-d64236e2de66" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_019f46b9-100a-745c-9eea-b144a0e9dfcb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_906ddf15-88e0-4656-b1c0-5a48f97753d8" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_019f46b9-100a-745c-9eea-b144a0e9dfcb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-745c-9eea-b144a0e9dfcb_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_019f46b9-100a-745c-9eea-b144a0e9dfcb" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-745c-9eea-b144a0e9dfcb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_019f46b9-100a-745c-9eea-b144a0e9dfcb" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherEquitySecuritiesMember_019f46b9-100a-76f0-a6ea-827009217093" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_ifrs-full_OtherEquitySecuritiesMember_019f46b9-100a-76f0-a6ea-827009217093" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_StructuredNotesLiabilitiesMember_019f46b9-100a-793a-94da-c32a7a2d930d" xlink:href="hsbc-20260630.xsd#hsbc_StructuredNotesLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_StructuredNotesLiabilitiesMember_019f46b9-100a-793a-94da-c32a7a2d930d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_StructuredNotesEquityLinkedOneMember_019f46b9-100a-7a70-8066-d678fb50d5d3" xlink:href="hsbc-20260630.xsd#hsbc_StructuredNotesEquityLinkedOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_StructuredNotesEquityLinkedOneMember_019f46b9-100a-7a70-8066-d678fb50d5d3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_StructuredNotesFXLinkedMember_019f46b9-100a-7ff1-ad2b-61f0fbf681e5" xlink:href="hsbc-20260630.xsd#hsbc_StructuredNotesFXLinkedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_StructuredNotesFXLinkedMember_019f46b9-100a-7ff1-ad2b-61f0fbf681e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_StructuredNotesOtherLiabilitiesMember_019f46b9-100a-77b1-bc07-8022ace468ff" xlink:href="hsbc-20260630.xsd#hsbc_StructuredNotesOtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_StructuredNotesOtherLiabilitiesMember_019f46b9-100a-77b1-bc07-8022ace468ff" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDerivativesLiabilitiesMember_019f46b9-100a-7256-b003-a2b1c8cc6145" xlink:href="hsbc-20260630.xsd#hsbc_OtherDerivativesLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_OtherDerivativesLiabilitiesMember_019f46b9-100a-7256-b003-a2b1c8cc6145" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DerivativeLiabilitiesInterestRateDerivativesMember_019f46ba-6c29-7ada-b042-94ac6584bc57" xlink:href="hsbc-20260630.xsd#hsbc_DerivativeLiabilitiesInterestRateDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_DerivativeLiabilitiesInterestRateDerivativesMember_019f46ba-6c29-7ada-b042-94ac6584bc57" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDerivativeLiabilitiesSecuritisationSwapsMember_019f46b9-100a-7c00-9945-11182cdc8367" xlink:href="hsbc-20260630.xsd#hsbc_OtherDerivativeLiabilitiesSecuritisationSwapsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_OtherDerivativeLiabilitiesSecuritisationSwapsMember_019f46b9-100a-7c00-9945-11182cdc8367" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDerivativeLiabilitiesLongDatedSwaptionsMember_019f46b9-100a-76f2-bb47-801eed58032d" xlink:href="hsbc-20260630.xsd#hsbc_OtherDerivativeLiabilitiesLongDatedSwaptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_OtherDerivativeLiabilitiesLongDatedSwaptionsMember_019f46b9-100a-76f2-bb47-801eed58032d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDerivativeLiabilitiesMiscellaneousMember_019f46b9-100a-796d-8a9c-a9987b0db6f2" xlink:href="hsbc-20260630.xsd#hsbc_OtherDerivativeLiabilitiesMiscellaneousMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_OtherDerivativeLiabilitiesMiscellaneousMember_019f46b9-100a-796d-8a9c-a9987b0db6f2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ForeignExchangeDerivativeLiabilitiesMember_019f46ba-d17d-7d91-8801-cb4a73ffa069" xlink:href="hsbc-20260630.xsd#hsbc_ForeignExchangeDerivativeLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_ForeignExchangeDerivativeLiabilitiesMember_019f46ba-d17d-7d91-8801-cb4a73ffa069" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDerivativeLiabilitiesForeignExchangeOptionsMember_019f46b9-100a-7858-8c06-43ba5da1af0c" xlink:href="hsbc-20260630.xsd#hsbc_OtherDerivativeLiabilitiesForeignExchangeOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_OtherDerivativeLiabilitiesForeignExchangeOptionsMember_019f46b9-100a-7858-8c06-43ba5da1af0c" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_EquityDerivativeLiabilitiesMember_019f46bb-0a9e-7454-a46f-b2e661212a0a" xlink:href="hsbc-20260630.xsd#hsbc_EquityDerivativeLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_EquityDerivativeLiabilitiesMember_019f46bb-0a9e-7454-a46f-b2e661212a0a" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDerivativeLiabilitiesLongDatedSingleStockOptionsMember_019f46b9-100a-7b73-8ce4-4623cc16e83b" xlink:href="hsbc-20260630.xsd#hsbc_OtherDerivativeLiabilitiesLongDatedSingleStockOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_OtherDerivativeLiabilitiesLongDatedSingleStockOptionsMember_019f46b9-100a-7b73-8ce4-4623cc16e83b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CreditDerivativeLiabilitiesMember_019f46bb-4696-7e46-a644-f1e4a07573ab" xlink:href="hsbc-20260630.xsd#hsbc_CreditDerivativeLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_CreditDerivativeLiabilitiesMember_019f46bb-4696-7e46-a644-f1e4a07573ab" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ReturnSwapLiabilitiesMember_019f46b9-100a-7d05-a9da-787076bef33a" xlink:href="hsbc-20260630.xsd#hsbc_ReturnSwapLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_ReturnSwapLiabilitiesMember_019f46b9-100a-7d05-a9da-787076bef33a" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherPortfoliosLiabilitiesBondsMember_019f46b9-100a-7498-93d1-9f5dfaca0c29" xlink:href="hsbc-20260630.xsd#hsbc_OtherPortfoliosLiabilitiesBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_OtherPortfoliosLiabilitiesBondsMember_019f46b9-100a-7498-93d1-9f5dfaca0c29" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansLiabilitiesMember_019f46b9-100a-780f-bd10-755e9c9c7965" xlink:href="hsbc-20260630.xsd#hsbc_LoansLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_LoansLiabilitiesMember_019f46b9-100a-780f-bd10-755e9c9c7965" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherPortfolioLiabilitiesMiscellaneousMember_019f46b9-100a-7ed0-878c-f1e48e496771" xlink:href="hsbc-20260630.xsd#hsbc_OtherPortfolioLiabilitiesMiscellaneousMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019f46b9-100a-7c72-97e9-baf766d46237" xlink:to="loc_hsbc_OtherPortfolioLiabilitiesMiscellaneousMember_019f46b9-100a-7ed0-878c-f1e48e496771" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis_019f46b9-100a-7b8c-acfc-2f8cbb2ba344" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_906ddf15-88e0-4656-b1c0-5a48f97753d8" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsAxis_019f46b9-100a-7b8c-acfc-2f8cbb2ba344" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7b8c-acfc-2f8cbb2ba344_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_019f46b9-100a-7b8c-acfc-2f8cbb2ba344" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7b8c-acfc-2f8cbb2ba344_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_019f46b9-100a-7b8c-acfc-2f8cbb2ba344" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherEquitySecuritiesMember_019f46b9-100a-7ea4-ad4b-70c7647daa99" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_ifrs-full_OtherEquitySecuritiesMember_019f46b9-100a-7ea4-ad4b-70c7647daa99" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_StructuredNotesEquityLinkedOneMember_019f46b9-100a-7801-8c95-88880cd4da0f" xlink:href="hsbc-20260630.xsd#hsbc_StructuredNotesEquityLinkedOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_StructuredNotesEquityLinkedOneMember_019f46b9-100a-7801-8c95-88880cd4da0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_StructuredNotesLiabilitiesMember_019f46b9-100a-7a31-b2f1-a08742934919" xlink:href="hsbc-20260630.xsd#hsbc_StructuredNotesLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_StructuredNotesLiabilitiesMember_019f46b9-100a-7a31-b2f1-a08742934919" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_StructuredNotesFXLinkedMember_019f46b9-100a-74c8-b077-ce1a2a83b019" xlink:href="hsbc-20260630.xsd#hsbc_StructuredNotesFXLinkedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_StructuredNotesFXLinkedMember_019f46b9-100a-74c8-b077-ce1a2a83b019" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_StructuredNotesOtherLiabilitiesMember_019f46b9-100a-7807-b286-cf7116a68c56" xlink:href="hsbc-20260630.xsd#hsbc_StructuredNotesOtherLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_StructuredNotesOtherLiabilitiesMember_019f46b9-100a-7807-b286-cf7116a68c56" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDerivativesAssetsMember_019f46b9-100a-78b3-aa72-da1b94c5c761" xlink:href="hsbc-20260630.xsd#hsbc_OtherDerivativesAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_OtherDerivativesAssetsMember_019f46b9-100a-78b3-aa72-da1b94c5c761" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DerivativeAssetsInterestRateDerivativesMember_019f46bc-c91a-717b-964e-8a6cb5126907" xlink:href="hsbc-20260630.xsd#hsbc_DerivativeAssetsInterestRateDerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_DerivativeAssetsInterestRateDerivativesMember_019f46bc-c91a-717b-964e-8a6cb5126907" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDerivativeAssetsSecuritisationSwapsMember_019f46b9-100a-756e-842f-fc9f4d1bae74" xlink:href="hsbc-20260630.xsd#hsbc_OtherDerivativeAssetsSecuritisationSwapsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_OtherDerivativeAssetsSecuritisationSwapsMember_019f46b9-100a-756e-842f-fc9f4d1bae74" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDerivativeAssetsLongDatedSwaptionsMember_019f46b9-100a-79bd-971e-58b17595722e" xlink:href="hsbc-20260630.xsd#hsbc_OtherDerivativeAssetsLongDatedSwaptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_OtherDerivativeAssetsLongDatedSwaptionsMember_019f46b9-100a-79bd-971e-58b17595722e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDerivativeAssetsMiscellaneousMember_019f46b9-100a-73d2-af75-7b4305cef776" xlink:href="hsbc-20260630.xsd#hsbc_OtherDerivativeAssetsMiscellaneousMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_OtherDerivativeAssetsMiscellaneousMember_019f46b9-100a-73d2-af75-7b4305cef776" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ForeignExchangeDerivativeAssetsMember_019f46bd-1962-7410-afa5-4993aea2cb32" xlink:href="hsbc-20260630.xsd#hsbc_ForeignExchangeDerivativeAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_ForeignExchangeDerivativeAssetsMember_019f46bd-1962-7410-afa5-4993aea2cb32" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDerivativeAssetsForeignExchangeOptionsMember_019f46b9-100a-7021-b5eb-decb8459bfa4" xlink:href="hsbc-20260630.xsd#hsbc_OtherDerivativeAssetsForeignExchangeOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_OtherDerivativeAssetsForeignExchangeOptionsMember_019f46b9-100a-7021-b5eb-decb8459bfa4" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_EquityDerivativeAssetsMember_019f46bd-45c8-7cbb-a0ef-a46870a97f95" xlink:href="hsbc-20260630.xsd#hsbc_EquityDerivativeAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_EquityDerivativeAssetsMember_019f46bd-45c8-7cbb-a0ef-a46870a97f95" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDerivativeAssetsLongDatedSingleStockOptionsMember_019f46b9-100a-732b-abdd-445dff315374" xlink:href="hsbc-20260630.xsd#hsbc_OtherDerivativeAssetsLongDatedSingleStockOptionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_OtherDerivativeAssetsLongDatedSingleStockOptionsMember_019f46b9-100a-732b-abdd-445dff315374" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CreditDerivativeAssetsMember_019f46bd-8a4e-71d9-9782-3fdbf08225bf" xlink:href="hsbc-20260630.xsd#hsbc_CreditDerivativeAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_CreditDerivativeAssetsMember_019f46bd-8a4e-71d9-9782-3fdbf08225bf" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ReturnSwapAssetsMember_019f46b9-100a-7b74-8e59-105fb9532fa7" xlink:href="hsbc-20260630.xsd#hsbc_ReturnSwapAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_ReturnSwapAssetsMember_019f46b9-100a-7b74-8e59-105fb9532fa7" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherPortfoliosBondsMember_019f46b9-100a-76c0-a12a-c2d0708d024b" xlink:href="hsbc-20260630.xsd#hsbc_OtherPortfoliosBondsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_OtherPortfoliosBondsMember_019f46b9-100a-76c0-a12a-c2d0708d024b" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansAssetsMember_019f46b9-100a-74bb-844b-7ea8b4f998ab" xlink:href="hsbc-20260630.xsd#hsbc_LoansAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_LoansAssetsMember_019f46b9-100a-74bb-844b-7ea8b4f998ab" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherPortfolioAssetsMiscellaneousMember_019f46b9-100a-7741-be9f-59714979901d" xlink:href="hsbc-20260630.xsd#hsbc_OtherPortfolioAssetsMiscellaneousMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f46b9-100a-7a1b-9ec8-67076473e2d2" xlink:to="loc_hsbc_OtherPortfolioAssetsMiscellaneousMember_019f46b9-100a-7741-be9f-59714979901d" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_82adbe93-b595-44bc-9ac1-6520c3fa9bdf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_cc8e3d48-d3d4-4f8f-8c0f-0da36c5f981f" xlink:to="loc_ifrs-full_FinancialAssets_82adbe93-b595-44bc-9ac1-6520c3fa9bdf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilities_288101a8-db59-4512-be16-fff42667a7cb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_cc8e3d48-d3d4-4f8f-8c0f-0da36c5f981f" xlink:to="loc_ifrs-full_FinancialLiabilities_288101a8-db59-4512-be16-fff42667a7cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantUnobservableInputLiabilities_4e1ded90-b938-49a8-bb1f-8c9713be3b97" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantUnobservableInputLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_cc8e3d48-d3d4-4f8f-8c0f-0da36c5f981f" xlink:to="loc_ifrs-full_SignificantUnobservableInputLiabilities_4e1ded90-b938-49a8-bb1f-8c9713be3b97" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantUnobservableInputAssets_4e63307e-9278-4337-9fb6-b7c75f2b55a5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantUnobservableInputAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_cc8e3d48-d3d4-4f8f-8c0f-0da36c5f981f" xlink:to="loc_ifrs-full_SignificantUnobservableInputAssets_4e63307e-9278-4337-9fb6-b7c75f2b55a5" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/FairvaluesoffinancialinstrumentsnotcarriedatfairvalueDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#FairvaluesoffinancialinstrumentsnotcarriedatfairvalueDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/FairvaluesoffinancialinstrumentsnotcarriedatfairvalueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_f9925fb0-8d55-4298-899b-697de6692561" xlink:href="hsbc-20260630.xsd#hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_0f260964-94c4-4b2b-932d-80138fbf892a" xlink:href="hsbc-20260630.xsd#hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_f9925fb0-8d55-4298-899b-697de6692561" xlink:to="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_0f260964-94c4-4b2b-932d-80138fbf892a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis_51faf236-1ab1-4c07-9056-9b5a8165bf80" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_0f260964-94c4-4b2b-932d-80138fbf892a" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsAxis_51faf236-1ab1-4c07-9056-9b5a8165bf80" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_51faf236-1ab1-4c07-9056-9b5a8165bf80_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_51faf236-1ab1-4c07-9056-9b5a8165bf80" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_51faf236-1ab1-4c07-9056-9b5a8165bf80_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_82ea8b08-056c-4523-b909-71d26d6d8c59" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_51faf236-1ab1-4c07-9056-9b5a8165bf80" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_82ea8b08-056c-4523-b909-71d26d6d8c59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansAndAdvancesToBanksMember_63b0afa9-6d0b-4255-9508-596c0c89ef47" xlink:href="hsbc-20260630.xsd#hsbc_LoansAndAdvancesToBanksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_82ea8b08-056c-4523-b909-71d26d6d8c59" xlink:to="loc_hsbc_LoansAndAdvancesToBanksMember_63b0afa9-6d0b-4255-9508-596c0c89ef47" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansAndAdvancesToCustomersMember_75ee32ad-3703-424f-aca4-0724e472f37f" xlink:href="hsbc-20260630.xsd#hsbc_LoansAndAdvancesToCustomersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_82ea8b08-056c-4523-b909-71d26d6d8c59" xlink:to="loc_hsbc_LoansAndAdvancesToCustomersMember_75ee32ad-3703-424f-aca4-0724e472f37f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_RepurchaseAgreementMember_7aa1bbcd-9852-4e28-bebb-d3a22121fe3a" xlink:href="hsbc-20260630.xsd#hsbc_RepurchaseAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_82ea8b08-056c-4523-b909-71d26d6d8c59" xlink:to="loc_hsbc_RepurchaseAgreementMember_7aa1bbcd-9852-4e28-bebb-d3a22121fe3a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtAmortisedCostMember_4968b9ec-1ea9-4134-a7b7-1997739d1113" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtAmortisedCostMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_82ea8b08-056c-4523-b909-71d26d6d8c59" xlink:to="loc_ifrs-full_FinancialAssetsAtAmortisedCostMember_4968b9ec-1ea9-4134-a7b7-1997739d1113" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_dea833d5-a28f-4f46-874f-464161440585" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_0f260964-94c4-4b2b-932d-80138fbf892a" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_dea833d5-a28f-4f46-874f-464161440585" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_dea833d5-a28f-4f46-874f-464161440585_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_dea833d5-a28f-4f46-874f-464161440585" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_dea833d5-a28f-4f46-874f-464161440585_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_a71128f7-5547-470a-8d5b-591cb9e0c644" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_dea833d5-a28f-4f46-874f-464161440585" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_a71128f7-5547-470a-8d5b-591cb9e0c644" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DepositsByBanksMember_3daf9db0-abcb-49d5-bce1-30da8f4cc92b" xlink:href="hsbc-20260630.xsd#hsbc_DepositsByBanksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_a71128f7-5547-470a-8d5b-591cb9e0c644" xlink:to="loc_hsbc_DepositsByBanksMember_3daf9db0-abcb-49d5-bce1-30da8f4cc92b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CustomerAccountsMember_9c6451c0-65a8-478c-984a-6a5185160803" xlink:href="hsbc-20260630.xsd#hsbc_CustomerAccountsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_a71128f7-5547-470a-8d5b-591cb9e0c644" xlink:to="loc_hsbc_CustomerAccountsMember_9c6451c0-65a8-478c-984a-6a5185160803" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_RepurchaseAgreementMember_36f680df-70c2-4c28-8fa0-bd27706ee494" xlink:href="hsbc-20260630.xsd#hsbc_RepurchaseAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_a71128f7-5547-470a-8d5b-591cb9e0c644" xlink:to="loc_hsbc_RepurchaseAgreementMember_36f680df-70c2-4c28-8fa0-bd27706ee494" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DebtSecuritiesMember_a8d0e117-0011-4cdc-bde4-f21a445d184f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_a71128f7-5547-470a-8d5b-591cb9e0c644" xlink:to="loc_ifrs-full_DebtSecuritiesMember_a8d0e117-0011-4cdc-bde4-f21a445d184f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_SubordinatedLiabilitiesMember_c19733d6-d578-4a79-b15b-697d6e85a137" xlink:href="hsbc-20260630.xsd#hsbc_SubordinatedLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_a71128f7-5547-470a-8d5b-591cb9e0c644" xlink:to="loc_hsbc_SubordinatedLiabilitiesMember_c19733d6-d578-4a79-b15b-697d6e85a137" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementAxis_d3eda67c-9aef-4ea6-ac37-9d79a08f7416" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_0f260964-94c4-4b2b-932d-80138fbf892a" xlink:to="loc_ifrs-full_MeasurementAxis_d3eda67c-9aef-4ea6-ac37-9d79a08f7416" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementDomain_d3eda67c-9aef-4ea6-ac37-9d79a08f7416_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MeasurementAxis_d3eda67c-9aef-4ea6-ac37-9d79a08f7416" xlink:to="loc_ifrs-full_MeasurementDomain_d3eda67c-9aef-4ea6-ac37-9d79a08f7416_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementDomain_2f1f319e-5155-4270-8150-e886175b72d0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MeasurementDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MeasurementAxis_d3eda67c-9aef-4ea6-ac37-9d79a08f7416" xlink:to="loc_ifrs-full_MeasurementDomain_2f1f319e-5155-4270-8150-e886175b72d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember_4f8e4807-fb64-455e-89a4-d86513a532b6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MeasurementDomain_2f1f319e-5155-4270-8150-e886175b72d0" xlink:to="loc_ifrs-full_NotMeasuredAtFairValueInStatementOfFinancialPositionButForWhichFairValueIsDisclosedMember_4f8e4807-fb64-455e-89a4-d86513a532b6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_88ebbbf9-6aba-408d-88bc-b0f914d922f9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_0f260964-94c4-4b2b-932d-80138fbf892a" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_88ebbbf9-6aba-408d-88bc-b0f914d922f9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_88ebbbf9-6aba-408d-88bc-b0f914d922f9_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_88ebbbf9-6aba-408d-88bc-b0f914d922f9" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_88ebbbf9-6aba-408d-88bc-b0f914d922f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_ceb39848-c5db-456b-88d0-f4d9e3ca96f4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_88ebbbf9-6aba-408d-88bc-b0f914d922f9" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_ceb39848-c5db-456b-88d0-f4d9e3ca96f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember_27ffc541-4472-408f-89c6-4eb254ce3998" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_ceb39848-c5db-456b-88d0-f4d9e3ca96f4" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember_27ffc541-4472-408f-89c6-4eb254ce3998" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_019fa405-c0fb-7250-8248-ec67836cc42c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_0f260964-94c4-4b2b-932d-80138fbf892a" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_019fa405-c0fb-7250-8248-ec67836cc42c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019fa405-c0fb-7250-8248-ec67836cc42c_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_019fa405-c0fb-7250-8248-ec67836cc42c" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019fa405-c0fb-7250-8248-ec67836cc42c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019fa405-c0fb-76f5-8c16-02b25dd111cb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_019fa405-c0fb-7250-8248-ec67836cc42c" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019fa405-c0fb-76f5-8c16-02b25dd111cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember_019fa405-c0fb-7d33-9fca-059df351d5e0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019fa405-c0fb-76f5-8c16-02b25dd111cb" xlink:to="loc_ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember_019fa405-c0fb-7d33-9fca-059df351d5e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_f65a4b8d-16cc-4560-9525-17d60f1278b5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_f9925fb0-8d55-4298-899b-697de6692561" xlink:to="loc_ifrs-full_FinancialAssets_f65a4b8d-16cc-4560-9525-17d60f1278b5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilities_77200547-40a2-42be-bb27-b40985e0e6fe" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_f9925fb0-8d55-4298-899b-697de6692561" xlink:to="loc_ifrs-full_FinancialLiabilities_77200547-40a2-42be-bb27-b40985e0e6fe" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/DerivativesNotionalcontractamountsandfairvalueofderivativesbyproductcontracttypeheldbyHSBCDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#DerivativesNotionalcontractamountsandfairvalueofderivativesbyproductcontracttypeheldbyHSBCDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/DerivativesNotionalcontractamountsandfairvalueofderivativesbyproductcontracttypeheldbyHSBCDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_aa22daeb-0081-468f-8d93-8240ad822405" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsTable_94082aed-3d14-4d41-815f-6cacd1146796" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_aa22daeb-0081-468f-8d93-8240ad822405" xlink:to="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsTable_94082aed-3d14-4d41-815f-6cacd1146796" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis_05413845-cc85-4011-a226-d4ac310e8837" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsTable_94082aed-3d14-4d41-815f-6cacd1146796" xlink:to="loc_ifrs-full_TypesOfRisksAxis_05413845-cc85-4011-a226-d4ac310e8837" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_05413845-cc85-4011-a226-d4ac310e8837_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_05413845-cc85-4011-a226-d4ac310e8837" xlink:to="loc_ifrs-full_TypesOfRisksDomain_05413845-cc85-4011-a226-d4ac310e8837_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_8fced3cc-42de-4b4b-9fd3-2bca70c5310e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_05413845-cc85-4011-a226-d4ac310e8837" xlink:to="loc_ifrs-full_TypesOfRisksDomain_8fced3cc-42de-4b4b-9fd3-2bca70c5310e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrencyRiskMember_224a16ce-3dc0-4c69-b118-4989bd3d21ed" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrencyRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_8fced3cc-42de-4b4b-9fd3-2bca70c5310e" xlink:to="loc_ifrs-full_CurrencyRiskMember_224a16ce-3dc0-4c69-b118-4989bd3d21ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestRateRiskMember_33dd59b7-3f96-4647-9b7b-1c6ebe2a0f74" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRateRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_8fced3cc-42de-4b4b-9fd3-2bca70c5310e" xlink:to="loc_ifrs-full_InterestRateRiskMember_33dd59b7-3f96-4647-9b7b-1c6ebe2a0f74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityPriceRiskMember_553b54be-932d-421c-bd0d-da3b938485e6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityPriceRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_8fced3cc-42de-4b4b-9fd3-2bca70c5310e" xlink:to="loc_ifrs-full_EquityPriceRiskMember_553b54be-932d-421c-bd0d-da3b938485e6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditRiskMember_cbc0987c-3f31-4213-afeb-ea352803ca3b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_8fced3cc-42de-4b4b-9fd3-2bca70c5310e" xlink:to="loc_ifrs-full_CreditRiskMember_cbc0987c-3f31-4213-afeb-ea352803ca3b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CommodityPriceRiskMember_b6481e80-37ba-46ce-9f93-239de81a80d4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CommodityPriceRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_8fced3cc-42de-4b4b-9fd3-2bca70c5310e" xlink:to="loc_ifrs-full_CommodityPriceRiskMember_b6481e80-37ba-46ce-9f93-239de81a80d4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialAssetsAxis_6f25825e-3c10-4fbb-8eb5-4103b82411ce" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsTable_94082aed-3d14-4d41-815f-6cacd1146796" xlink:to="loc_ifrs-full_TypesOfFinancialAssetsAxis_6f25825e-3c10-4fbb-8eb5-4103b82411ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialAssetsDomain_6f25825e-3c10-4fbb-8eb5-4103b82411ce_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfFinancialAssetsAxis_6f25825e-3c10-4fbb-8eb5-4103b82411ce" xlink:to="loc_ifrs-full_TypesOfFinancialAssetsDomain_6f25825e-3c10-4fbb-8eb5-4103b82411ce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialAssetsDomain_c6d5c0d7-130a-4129-8939-e6044aa204a5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfFinancialAssetsAxis_6f25825e-3c10-4fbb-8eb5-4103b82411ce" xlink:to="loc_ifrs-full_TypesOfFinancialAssetsDomain_c6d5c0d7-130a-4129-8939-e6044aa204a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativesMember_954f1353-e45c-4329-a0d7-33dabbc48da4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfFinancialAssetsDomain_c6d5c0d7-130a-4129-8939-e6044aa204a5" xlink:to="loc_ifrs-full_DerivativesMember_954f1353-e45c-4329-a0d7-33dabbc48da4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_af87bc64-e783-4ad1-b7ab-8e3b4f29bf90" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsTable_94082aed-3d14-4d41-815f-6cacd1146796" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_af87bc64-e783-4ad1-b7ab-8e3b4f29bf90" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_af87bc64-e783-4ad1-b7ab-8e3b4f29bf90_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_af87bc64-e783-4ad1-b7ab-8e3b4f29bf90" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_af87bc64-e783-4ad1-b7ab-8e3b4f29bf90_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_2fbf4c42-c442-4285-ae1e-e8148e5b548a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfFinancialLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesAxis_af87bc64-e783-4ad1-b7ab-8e3b4f29bf90" xlink:to="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_2fbf4c42-c442-4285-ae1e-e8148e5b548a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativesMember_ed3925c5-2428-463c-95f9-380d3a070a19" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfFinancialLiabilitiesDomain_2fbf4c42-c442-4285-ae1e-e8148e5b548a" xlink:to="loc_ifrs-full_DerivativesMember_ed3925c5-2428-463c-95f9-380d3a070a19" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NotionalAmountOfDerivativeTradingInstruments_4451da96-1a55-408f-ba83-7e86acdd06c2" xlink:href="hsbc-20260630.xsd#hsbc_NotionalAmountOfDerivativeTradingInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_aa22daeb-0081-468f-8d93-8240ad822405" xlink:to="loc_hsbc_NotionalAmountOfDerivativeTradingInstruments_4451da96-1a55-408f-ba83-7e86acdd06c2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NominalAmountOfHedgingInstrument_d3b11e25-ba19-4c7c-8dec-d33aadadd33e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NominalAmountOfHedgingInstrument"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_aa22daeb-0081-468f-8d93-8240ad822405" xlink:to="loc_ifrs-full_NominalAmountOfHedgingInstrument_d3b11e25-ba19-4c7c-8dec-d33aadadd33e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativeFinancialAssetsHeldForTrading_359b4267-c45a-46c9-b927-96d68dff7091" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativeFinancialAssetsHeldForTrading"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_aa22daeb-0081-468f-8d93-8240ad822405" xlink:to="loc_ifrs-full_DerivativeFinancialAssetsHeldForTrading_359b4267-c45a-46c9-b927-96d68dff7091" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_HedgingInstrumentAssets_d016e46c-83df-4413-9a42-9beeae8e1ae3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_HedgingInstrumentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_aa22daeb-0081-468f-8d93-8240ad822405" xlink:to="loc_ifrs-full_HedgingInstrumentAssets_d016e46c-83df-4413-9a42-9beeae8e1ae3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_GrossDerivativeFinancialAssetsIncludingNotSubjecttoEnforceableMasterNettingArrangements_b084be2d-d3e9-4613-b042-abf67f6fb9de" xlink:href="hsbc-20260630.xsd#hsbc_GrossDerivativeFinancialAssetsIncludingNotSubjecttoEnforceableMasterNettingArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_aa22daeb-0081-468f-8d93-8240ad822405" xlink:to="loc_hsbc_GrossDerivativeFinancialAssetsIncludingNotSubjecttoEnforceableMasterNettingArrangements_b084be2d-d3e9-4613-b042-abf67f6fb9de" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossFinancialLiabilitiesSetOffAgainstFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements_568d26d1-a293-45ca-9355-3b93b07ecfaa" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossFinancialLiabilitiesSetOffAgainstFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_aa22daeb-0081-468f-8d93-8240ad822405" xlink:to="loc_ifrs-full_GrossFinancialLiabilitiesSetOffAgainstFinancialAssetsSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements_568d26d1-a293-45ca-9355-3b93b07ecfaa" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativeFinancialAssets_b19bee00-3ca6-429d-aa2d-887b8e11a0d9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativeFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_aa22daeb-0081-468f-8d93-8240ad822405" xlink:to="loc_ifrs-full_DerivativeFinancialAssets_b19bee00-3ca6-429d-aa2d-887b8e11a0d9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativeFinancialLiabilitiesHeldForTrading_69d44381-8f58-4339-b54e-981651b83d5c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativeFinancialLiabilitiesHeldForTrading"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_aa22daeb-0081-468f-8d93-8240ad822405" xlink:to="loc_ifrs-full_DerivativeFinancialLiabilitiesHeldForTrading_69d44381-8f58-4339-b54e-981651b83d5c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_HedgingInstrumentLiabilities_37aebd3d-9e23-4cca-99fc-314d2118fd44" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_HedgingInstrumentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_aa22daeb-0081-468f-8d93-8240ad822405" xlink:to="loc_ifrs-full_HedgingInstrumentLiabilities_37aebd3d-9e23-4cca-99fc-314d2118fd44" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_GrossDerivativeFinancialLiabilitiesIncludingNotSubjecttoEnforceableMasterNettingArrangements_655ce886-51a7-4241-bbd2-24fedb63ea84" xlink:href="hsbc-20260630.xsd#hsbc_GrossDerivativeFinancialLiabilitiesIncludingNotSubjecttoEnforceableMasterNettingArrangements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_aa22daeb-0081-468f-8d93-8240ad822405" xlink:to="loc_hsbc_GrossDerivativeFinancialLiabilitiesIncludingNotSubjecttoEnforceableMasterNettingArrangements_655ce886-51a7-4241-bbd2-24fedb63ea84" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossFinancialAssetsSetOffAgainstFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements_c4b0f126-216d-4313-a46b-41335fb441e0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossFinancialAssetsSetOffAgainstFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_aa22daeb-0081-468f-8d93-8240ad822405" xlink:to="loc_ifrs-full_GrossFinancialAssetsSetOffAgainstFinancialLiabilitiesSubjectToOffsettingEnforceableMasterNettingArrangementsOrSimilarAgreements_c4b0f126-216d-4313-a46b-41335fb441e0" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativeFinancialLiabilities_3ea2bd79-4867-40af-bbe9-e94f45f00c39" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativeFinancialLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_aa22daeb-0081-468f-8d93-8240ad822405" xlink:to="loc_ifrs-full_DerivativeFinancialLiabilities_3ea2bd79-4867-40af-bbe9-e94f45f00c39" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/DerivativesNotionalcontractamountsofderivativesheldforhedgingpurposesbyproducttypeDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#DerivativesNotionalcontractamountsofderivativesheldforhedgingpurposesbyproducttypeDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/DerivativesNotionalcontractamountsofderivativesheldforhedgingpurposesbyproducttypeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_d34305a1-3a94-4ebd-8ea5-a433100c696b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsTable_f460dad8-451a-40fa-a9d5-eda11a08c91a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_d34305a1-3a94-4ebd-8ea5-a433100c696b" xlink:to="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsTable_f460dad8-451a-40fa-a9d5-eda11a08c91a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis_7dffa721-d326-4400-a199-63b41168c01e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsTable_f460dad8-451a-40fa-a9d5-eda11a08c91a" xlink:to="loc_ifrs-full_TypesOfRisksAxis_7dffa721-d326-4400-a199-63b41168c01e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_7dffa721-d326-4400-a199-63b41168c01e_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_7dffa721-d326-4400-a199-63b41168c01e" xlink:to="loc_ifrs-full_TypesOfRisksDomain_7dffa721-d326-4400-a199-63b41168c01e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_0227b0b0-3bf1-4d8e-b497-56172bba5b66" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_7dffa721-d326-4400-a199-63b41168c01e" xlink:to="loc_ifrs-full_TypesOfRisksDomain_0227b0b0-3bf1-4d8e-b497-56172bba5b66" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrencyRiskMember_71ff3ee6-841a-4070-95d9-ccd44580ceeb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrencyRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_0227b0b0-3bf1-4d8e-b497-56172bba5b66" xlink:to="loc_ifrs-full_CurrencyRiskMember_71ff3ee6-841a-4070-95d9-ccd44580ceeb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestRateRiskMember_8700c650-5608-4721-a7d7-b2d7c94a512e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRateRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_0227b0b0-3bf1-4d8e-b497-56172bba5b66" xlink:to="loc_ifrs-full_InterestRateRiskMember_8700c650-5608-4721-a7d7-b2d7c94a512e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfHedgesAxis_e54522a9-4eee-44e7-95c0-a929be5e8138" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfHedgesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsTable_f460dad8-451a-40fa-a9d5-eda11a08c91a" xlink:to="loc_ifrs-full_TypesOfHedgesAxis_e54522a9-4eee-44e7-95c0-a929be5e8138" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfHedgesDomain_e54522a9-4eee-44e7-95c0-a929be5e8138_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfHedgesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfHedgesAxis_e54522a9-4eee-44e7-95c0-a929be5e8138" xlink:to="loc_ifrs-full_TypesOfHedgesDomain_e54522a9-4eee-44e7-95c0-a929be5e8138_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfHedgesDomain_9ea202fb-7f0d-489f-b2c2-aa83b1073eac" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfHedgesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfHedgesAxis_e54522a9-4eee-44e7-95c0-a929be5e8138" xlink:to="loc_ifrs-full_TypesOfHedgesDomain_9ea202fb-7f0d-489f-b2c2-aa83b1073eac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowHedgesMember_d58cdd89-88f8-406a-a821-87025244e493" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashFlowHedgesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfHedgesDomain_9ea202fb-7f0d-489f-b2c2-aa83b1073eac" xlink:to="loc_ifrs-full_CashFlowHedgesMember_d58cdd89-88f8-406a-a821-87025244e493" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FairValueHedgesMember_39498c75-3c7a-42e8-a032-1c6f1564735e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FairValueHedgesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfHedgesDomain_9ea202fb-7f0d-489f-b2c2-aa83b1073eac" xlink:to="loc_ifrs-full_FairValueHedgesMember_39498c75-3c7a-42e8-a032-1c6f1564735e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_HedgesOfNetInvestmentInForeignOperationsMember_a09a839f-9cc5-4d5b-9cc2-c9e925472756" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_HedgesOfNetInvestmentInForeignOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfHedgesDomain_9ea202fb-7f0d-489f-b2c2-aa83b1073eac" xlink:to="loc_ifrs-full_HedgesOfNetInvestmentInForeignOperationsMember_a09a839f-9cc5-4d5b-9cc2-c9e925472756" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NominalAmountOfHedgingInstrument_d9a71a41-a5f6-44af-8f97-e1dcbae068db" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NominalAmountOfHedgingInstrument"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutHedgingInstrumentsLineItems_d34305a1-3a94-4ebd-8ea5-a433100c696b" xlink:to="loc_ifrs-full_NominalAmountOfHedgingInstrument_d9a71a41-a5f6-44af-8f97-e1dcbae068db" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/FinancialinvestmentsDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#FinancialinvestmentsDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/FinancialinvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_419bf8e2-76b1-43e6-a20d-775e3c973115" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_12af9037-05d4-416c-8df2-fbe06682a99a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_419bf8e2-76b1-43e6-a20d-775e3c973115" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_12af9037-05d4-416c-8df2-fbe06682a99a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_3866d770-11d9-4300-9162-7cf719ca3b5f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_12af9037-05d4-416c-8df2-fbe06682a99a" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_3866d770-11d9-4300-9162-7cf719ca3b5f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_3866d770-11d9-4300-9162-7cf719ca3b5f_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_3866d770-11d9-4300-9162-7cf719ca3b5f" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_3866d770-11d9-4300-9162-7cf719ca3b5f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_2d7b9395-3b14-4549-895d-dc3885b6823f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_3866d770-11d9-4300-9162-7cf719ca3b5f" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_2d7b9395-3b14-4549-895d-dc3885b6823f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_8e8eed1a-07da-45d5-be8e-8e2063f67d56" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_2d7b9395-3b14-4549-895d-dc3885b6823f" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_8e8eed1a-07da-45d5-be8e-8e2063f67d56" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_ee8459c2-5e2f-46ae-a956-36a5824a4ad0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_2d7b9395-3b14-4549-895d-dc3885b6823f" xlink:to="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_ee8459c2-5e2f-46ae-a956-36a5824a4ad0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_FinancialAssetsAtAmortisedCostAndAtFairValueThroughOtherComprehensiveIncomeCategoryMember_a71307a0-6fa7-483a-8835-5e65453b6f0a" xlink:href="hsbc-20260630.xsd#hsbc_FinancialAssetsAtAmortisedCostAndAtFairValueThroughOtherComprehensiveIncomeCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_2d7b9395-3b14-4549-895d-dc3885b6823f" xlink:to="loc_hsbc_FinancialAssetsAtAmortisedCostAndAtFairValueThroughOtherComprehensiveIncomeCategoryMember_a71307a0-6fa7-483a-8835-5e65453b6f0a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis_4888481a-3c05-403f-ab5f-6bce2ca6adf1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_12af9037-05d4-416c-8df2-fbe06682a99a" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsAxis_4888481a-3c05-403f-ab5f-6bce2ca6adf1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_4888481a-3c05-403f-ab5f-6bce2ca6adf1_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_4888481a-3c05-403f-ab5f-6bce2ca6adf1" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_4888481a-3c05-403f-ab5f-6bce2ca6adf1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_657dbef5-68b3-4b92-9310-d96f073123f6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_4888481a-3c05-403f-ab5f-6bce2ca6adf1" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_657dbef5-68b3-4b92-9310-d96f073123f6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_TreasuryAndOtherEligibleBillsMember_36a22bc2-9402-42c1-9826-935f3ab15e4a" xlink:href="hsbc-20260630.xsd#hsbc_TreasuryAndOtherEligibleBillsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_657dbef5-68b3-4b92-9310-d96f073123f6" xlink:to="loc_hsbc_TreasuryAndOtherEligibleBillsMember_36a22bc2-9402-42c1-9826-935f3ab15e4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DebtSecuritiesMember_1b21f6db-35e2-44c3-b7e0-d99a807782af" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_657dbef5-68b3-4b92-9310-d96f073123f6" xlink:to="loc_ifrs-full_DebtSecuritiesMember_1b21f6db-35e2-44c3-b7e0-d99a807782af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityInvestmentsMember_d9750e87-4e27-489d-bb3a-e730ac9a5b8b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_657dbef5-68b3-4b92-9310-d96f073123f6" xlink:to="loc_ifrs-full_EquityInvestmentsMember_d9750e87-4e27-489d-bb3a-e730ac9a5b8b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherFinancialInstrumentsMember_716ab232-07db-47a6-a89f-815e4a55ed69" xlink:href="hsbc-20260630.xsd#hsbc_OtherFinancialInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_657dbef5-68b3-4b92-9310-d96f073123f6" xlink:to="loc_hsbc_OtherFinancialInstrumentsMember_716ab232-07db-47a6-a89f-815e4a55ed69" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_a88360e7-2b1c-497e-8308-148278137026" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_419bf8e2-76b1-43e6-a20d-775e3c973115" xlink:to="loc_ifrs-full_FinancialAssets_a88360e7-2b1c-497e-8308-148278137026" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/InterestsinassociatesandjointventuresAssociatesandJointVenturesCommentaryDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#InterestsinassociatesandjointventuresAssociatesandJointVenturesCommentaryDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/InterestsinassociatesandjointventuresAssociatesandJointVenturesCommentaryDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_b3311bc6-6569-422d-b5f8-618fd114fc00" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_0b6d535f-f6f3-4eb2-846f-07c2426ea0b5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_b3311bc6-6569-422d-b5f8-618fd114fc00" xlink:to="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_0b6d535f-f6f3-4eb2-846f-07c2426ea0b5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_6cbbc265-5e39-4650-8f0f-5cca914e915e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_0b6d535f-f6f3-4eb2-846f-07c2426ea0b5" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_6cbbc265-5e39-4650-8f0f-5cca914e915e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_6cbbc265-5e39-4650-8f0f-5cca914e915e_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_6cbbc265-5e39-4650-8f0f-5cca914e915e" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_6cbbc265-5e39-4650-8f0f-5cca914e915e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_87fa7423-9f8d-4d26-bb42-6b7364775a1a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_6cbbc265-5e39-4650-8f0f-5cca914e915e" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_87fa7423-9f8d-4d26-bb42-6b7364775a1a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BankOfCommunicationsCo.LimitedMember_7f6b2c57-ab22-4355-95f7-95ec4fc6ef7a" xlink:href="hsbc-20260630.xsd#hsbc_BankOfCommunicationsCo.LimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_87fa7423-9f8d-4d26-bb42-6b7364775a1a" xlink:to="loc_hsbc_BankOfCommunicationsCo.LimitedMember_7f6b2c57-ab22-4355-95f7-95ec4fc6ef7a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates_317f8b23-994b-4fa2-a615-7ba86f03285b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_b3311bc6-6569-422d-b5f8-618fd114fc00" xlink:to="loc_ifrs-full_InvestmentsInSubsidiariesJointVenturesAndAssociates_317f8b23-994b-4fa2-a615-7ba86f03285b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInAssociate_b8fec685-a3ab-4782-8039-31c2b1e5c0b2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInAssociate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_b3311bc6-6569-422d-b5f8-618fd114fc00" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInAssociate_b8fec685-a3ab-4782-8039-31c2b1e5c0b2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_dc65c11c-f8c2-4696-8968-a635ac13c5bb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_b3311bc6-6569-422d-b5f8-618fd114fc00" xlink:to="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_dc65c11c-f8c2-4696-8968-a635ac13c5bb" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentsInAssociates_3fe9280e-0462-4680-a920-806da1ac9b40" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InvestmentsInAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_b3311bc6-6569-422d-b5f8-618fd114fc00" xlink:to="loc_ifrs-full_InvestmentsInAssociates_3fe9280e-0462-4680-a920-806da1ac9b40" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FairValueOfInvestmentsInAssociatesWherePriceQuotationsPublished_59396d48-6ec3-4a94-8218-e76ae5933e8e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FairValueOfInvestmentsInAssociatesWherePriceQuotationsPublished"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_b3311bc6-6569-422d-b5f8-618fd114fc00" xlink:to="loc_ifrs-full_FairValueOfInvestmentsInAssociatesWherePriceQuotationsPublished_59396d48-6ec3-4a94-8218-e76ae5933e8e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DilutionLossesFromInvestmentsInAssociates_a775f9f9-17bb-453c-b28f-97c8ab313079" xlink:href="hsbc-20260630.xsd#hsbc_DilutionLossesFromInvestmentsInAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_b3311bc6-6569-422d-b5f8-618fd114fc00" xlink:to="loc_hsbc_DilutionLossesFromInvestmentsInAssociates_a775f9f9-17bb-453c-b28f-97c8ab313079" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NumberOfMainComponentsInValueInUseCalculation_16e91257-ce17-4f44-b70a-580bcddf93fb" xlink:href="hsbc-20260630.xsd#hsbc_NumberOfMainComponentsInValueInUseCalculation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_b3311bc6-6569-422d-b5f8-618fd114fc00" xlink:to="loc_hsbc_NumberOfMainComponentsInValueInUseCalculation_16e91257-ce17-4f44-b70a-580bcddf93fb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineValueInUseShortToMediumForecastTerm_96e50070-cefe-4b59-9812-03306310f47b" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineValueInUseShortToMediumForecastTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_b3311bc6-6569-422d-b5f8-618fd114fc00" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineValueInUseShortToMediumForecastTerm_96e50070-cefe-4b59-9812-03306310f47b" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/InterestsinassociatesandjointventuresPrincipalassociatesofHSBCDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#InterestsinassociatesandjointventuresPrincipalassociatesofHSBCDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/InterestsinassociatesandjointventuresPrincipalassociatesofHSBCDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_e882db94-26b7-4947-b872-5578b0172619" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_402fa02d-951c-4b6c-b3b2-6cab4b3ee17c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_e882db94-26b7-4947-b872-5578b0172619" xlink:to="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_402fa02d-951c-4b6c-b3b2-6cab4b3ee17c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_c71ee26b-50e1-4823-90ff-c02b6752b82a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_402fa02d-951c-4b6c-b3b2-6cab4b3ee17c" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_c71ee26b-50e1-4823-90ff-c02b6752b82a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_c71ee26b-50e1-4823-90ff-c02b6752b82a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_c71ee26b-50e1-4823-90ff-c02b6752b82a" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_c71ee26b-50e1-4823-90ff-c02b6752b82a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_9ae17494-64dd-4ac2-8787-ff4b93718f0b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_c71ee26b-50e1-4823-90ff-c02b6752b82a" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_9ae17494-64dd-4ac2-8787-ff4b93718f0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BankOfCommunicationsCo.LimitedMember_35cb07f6-acdf-470e-92b8-ddf1d6ea96a4" xlink:href="hsbc-20260630.xsd#hsbc_BankOfCommunicationsCo.LimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_9ae17494-64dd-4ac2-8787-ff4b93718f0b" xlink:to="loc_hsbc_BankOfCommunicationsCo.LimitedMember_35cb07f6-acdf-470e-92b8-ddf1d6ea96a4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_SaudiAwwalBankMember_ba04ed53-8de0-4b83-9292-2d96e474117c" xlink:href="hsbc-20260630.xsd#hsbc_SaudiAwwalBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_9ae17494-64dd-4ac2-8787-ff4b93718f0b" xlink:to="loc_hsbc_SaudiAwwalBankMember_ba04ed53-8de0-4b83-9292-2d96e474117c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentsInAssociates_bec8d089-2447-4700-9e7b-72e426f76031" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InvestmentsInAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_e882db94-26b7-4947-b872-5578b0172619" xlink:to="loc_ifrs-full_InvestmentsInAssociates_bec8d089-2447-4700-9e7b-72e426f76031" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FairValueOfInvestmentsInAssociatesWherePriceQuotationsPublished_a2720679-b909-4e83-a415-04dc2235bb31" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FairValueOfInvestmentsInAssociatesWherePriceQuotationsPublished"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_e882db94-26b7-4947-b872-5578b0172619" xlink:to="loc_ifrs-full_FairValueOfInvestmentsInAssociatesWherePriceQuotationsPublished_a2720679-b909-4e83-a415-04dc2235bb31" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/InterestsinassociatesandjointventuresShareofprofitDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#InterestsinassociatesandjointventuresShareofprofitDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/InterestsinassociatesandjointventuresShareofprofitDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_d80f7f5a-13c2-4317-ab90-f9bf03f28247" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_24cafe24-2367-49f1-af46-e259eb67722b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_d80f7f5a-13c2-4317-ab90-f9bf03f28247" xlink:to="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_24cafe24-2367-49f1-af46-e259eb67722b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_2e86edb3-9750-4ebc-a8ba-ba6c991a3590" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_24cafe24-2367-49f1-af46-e259eb67722b" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_2e86edb3-9750-4ebc-a8ba-ba6c991a3590" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_2e86edb3-9750-4ebc-a8ba-ba6c991a3590_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_2e86edb3-9750-4ebc-a8ba-ba6c991a3590" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_2e86edb3-9750-4ebc-a8ba-ba6c991a3590_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_107cfd78-d177-4751-98f6-869d3310ebce" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_2e86edb3-9750-4ebc-a8ba-ba6c991a3590" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_107cfd78-d177-4751-98f6-869d3310ebce" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BankOfCommunicationsCo.LimitedMember_d8187021-2aa4-479a-9435-01d2a0712b77" xlink:href="hsbc-20260630.xsd#hsbc_BankOfCommunicationsCo.LimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_107cfd78-d177-4751-98f6-869d3310ebce" xlink:to="loc_hsbc_BankOfCommunicationsCo.LimitedMember_d8187021-2aa4-479a-9435-01d2a0712b77" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_SaudiAwwalBankMember_891e9623-1691-4972-8bc2-ddf56ef7e349" xlink:href="hsbc-20260630.xsd#hsbc_SaudiAwwalBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_107cfd78-d177-4751-98f6-869d3310ebce" xlink:to="loc_hsbc_SaudiAwwalBankMember_891e9623-1691-4972-8bc2-ddf56ef7e349" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherAssociatesAndJointVenturesMember_9af255c1-5736-4b26-b4a6-3db8e42bf016" xlink:href="hsbc-20260630.xsd#hsbc_OtherAssociatesAndJointVenturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_107cfd78-d177-4751-98f6-869d3310ebce" xlink:to="loc_hsbc_OtherAssociatesAndJointVenturesMember_9af255c1-5736-4b26-b4a6-3db8e42bf016" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_ee46e4f1-d6eb-4665-8c45-3088758d6903" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_d80f7f5a-13c2-4317-ab90-f9bf03f28247" xlink:to="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_ee46e4f1-d6eb-4665-8c45-3088758d6903" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_c6372e2c-886a-4aab-b066-44cb9e03f5e6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_d80f7f5a-13c2-4317-ab90-f9bf03f28247" xlink:to="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLoss_c6372e2c-886a-4aab-b066-44cb9e03f5e6" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/InterestsinassociatesandjointventuresKeyassumptionsinvalueinusecalculationDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#InterestsinassociatesandjointventuresKeyassumptionsinvalueinusecalculationDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/InterestsinassociatesandjointventuresKeyassumptionsinvalueinusecalculationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_b7d29d24-c290-490e-b7c0-ccb614eb9578" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_b7d29d24-c290-490e-b7c0-ccb614eb9578" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_53142f31-0c8d-48a7-b468-cd8e722ee5dd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_b7d29d24-c290-490e-b7c0-ccb614eb9578" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_53142f31-0c8d-48a7-b468-cd8e722ee5dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_53142f31-0c8d-48a7-b468-cd8e722ee5dd_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_53142f31-0c8d-48a7-b468-cd8e722ee5dd" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_53142f31-0c8d-48a7-b468-cd8e722ee5dd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_c7be42d0-a5a3-4d04-9c60-1546705ba63d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInAssociatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesAxis_53142f31-0c8d-48a7-b468-cd8e722ee5dd" xlink:to="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_c7be42d0-a5a3-4d04-9c60-1546705ba63d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BankOfCommunicationsCo.LimitedMember_f71b0729-19ef-4eed-8209-f52379829d29" xlink:href="hsbc-20260630.xsd#hsbc_BankOfCommunicationsCo.LimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_c7be42d0-a5a3-4d04-9c60-1546705ba63d" xlink:to="loc_hsbc_BankOfCommunicationsCo.LimitedMember_f71b0729-19ef-4eed-8209-f52379829d29" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_SaudiAwwalBankMember_c3920077-0c2a-4c52-8049-0d58c9a5a584" xlink:href="hsbc-20260630.xsd#hsbc_SaudiAwwalBankMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInAssociatesDomain_c7be42d0-a5a3-4d04-9c60-1546705ba63d" xlink:to="loc_hsbc_SaudiAwwalBankMember_c3920077-0c2a-4c52-8049-0d58c9a5a584" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeAxis_8e829966-a96d-48e8-bdfa-164262b15bc4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_b7d29d24-c290-490e-b7c0-ccb614eb9578" xlink:to="loc_ifrs-full_RangeAxis_8e829966-a96d-48e8-bdfa-164262b15bc4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_8e829966-a96d-48e8-bdfa-164262b15bc4_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_8e829966-a96d-48e8-bdfa-164262b15bc4" xlink:to="loc_ifrs-full_RangeDomain_8e829966-a96d-48e8-bdfa-164262b15bc4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_32d21fb3-838a-479c-9d48-29c86467a7ab" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_8e829966-a96d-48e8-bdfa-164262b15bc4" xlink:to="loc_ifrs-full_RangeDomain_32d21fb3-838a-479c-9d48-29c86467a7ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BottomOfRangeMember_9bd66092-9f11-4856-bda2-9d2097c104d3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_32d21fb3-838a-479c-9d48-29c86467a7ab" xlink:to="loc_ifrs-full_BottomOfRangeMember_9bd66092-9f11-4856-bda2-9d2097c104d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TopOfRangeMember_b5be7f09-a393-4c92-bff1-d4ba5d3acc74" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_32d21fb3-838a-479c-9d48-29c86467a7ab" xlink:to="loc_ifrs-full_TopOfRangeMember_b5be7f09-a393-4c92-bff1-d4ba5d3acc74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CategoriesOfKeyAssumptionsAxis_7d3659d6-888c-4139-8356-e4ded274cda0" xlink:href="hsbc-20260630.xsd#hsbc_CategoriesOfKeyAssumptionsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesTable_b7d29d24-c290-490e-b7c0-ccb614eb9578" xlink:to="loc_hsbc_CategoriesOfKeyAssumptionsAxis_7d3659d6-888c-4139-8356-e4ded274cda0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CategoriesOfKeyAssumptionsDomain_7d3659d6-888c-4139-8356-e4ded274cda0_default" xlink:href="hsbc-20260630.xsd#hsbc_CategoriesOfKeyAssumptionsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_CategoriesOfKeyAssumptionsAxis_7d3659d6-888c-4139-8356-e4ded274cda0" xlink:to="loc_hsbc_CategoriesOfKeyAssumptionsDomain_7d3659d6-888c-4139-8356-e4ded274cda0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CategoriesOfKeyAssumptionsDomain_414f462c-fd94-47c3-8a23-c52dd9e5374d" xlink:href="hsbc-20260630.xsd#hsbc_CategoriesOfKeyAssumptionsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_CategoriesOfKeyAssumptionsAxis_7d3659d6-888c-4139-8356-e4ded274cda0" xlink:to="loc_hsbc_CategoriesOfKeyAssumptionsDomain_414f462c-fd94-47c3-8a23-c52dd9e5374d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DiscountRateMeasurementInputMember_3437bd6b-087a-4326-b95a-307b3da384ab" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DiscountRateMeasurementInputMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_CategoriesOfKeyAssumptionsDomain_414f462c-fd94-47c3-8a23-c52dd9e5374d" xlink:to="loc_ifrs-full_DiscountRateMeasurementInputMember_3437bd6b-087a-4326-b95a-307b3da384ab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DescriptionOfGrowthRateUsedToExtrapolateLongTermProfitProjectionsInCurrentEstimateOfValueInUse_30736adb-3d21-4c95-8635-f6075db537bd" xlink:href="hsbc-20260630.xsd#hsbc_DescriptionOfGrowthRateUsedToExtrapolateLongTermProfitProjectionsInCurrentEstimateOfValueInUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_hsbc_DescriptionOfGrowthRateUsedToExtrapolateLongTermProfitProjectionsInCurrentEstimateOfValueInUse_30736adb-3d21-4c95-8635-f6075db537bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DescriptionOfGrowthRateUsedToExtrapolateLongTermAssetProjectionsInCurrentEstimateOfValueInUse_d9a4071c-1d71-4c6e-ab8b-596a7d0f444f" xlink:href="hsbc-20260630.xsd#hsbc_DescriptionOfGrowthRateUsedToExtrapolateLongTermAssetProjectionsInCurrentEstimateOfValueInUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_hsbc_DescriptionOfGrowthRateUsedToExtrapolateLongTermAssetProjectionsInCurrentEstimateOfValueInUse_d9a4071c-1d71-4c6e-ab8b-596a7d0f444f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DescriptionOfDiscountRatesUsedInCurrentEstimateOfValueInUse_4d0b1e9d-e3df-43e4-8056-6de49411a85a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DescriptionOfDiscountRatesUsedInCurrentEstimateOfValueInUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_ifrs-full_DescriptionOfDiscountRatesUsedInCurrentEstimateOfValueInUse_4d0b1e9d-e3df-43e4-8056-6de49411a85a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DescriptionOfExpectedCreditLossesAsPercentageOfCustomerAdvancesInCurrentEstimateOfValueInUse_f390d7c2-a246-4712-87c8-8561a60b1c64" xlink:href="hsbc-20260630.xsd#hsbc_DescriptionOfExpectedCreditLossesAsPercentageOfCustomerAdvancesInCurrentEstimateOfValueInUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_hsbc_DescriptionOfExpectedCreditLossesAsPercentageOfCustomerAdvancesInCurrentEstimateOfValueInUse_f390d7c2-a246-4712-87c8-8561a60b1c64" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DescriptionOfExpectedCreditLossesAsPercentageOfCustomerAdvancesInFutureEstimateOfValueInUse_ec1f5ea5-0a55-4527-b7db-0a56ca9e95ef" xlink:href="hsbc-20260630.xsd#hsbc_DescriptionOfExpectedCreditLossesAsPercentageOfCustomerAdvancesInFutureEstimateOfValueInUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_hsbc_DescriptionOfExpectedCreditLossesAsPercentageOfCustomerAdvancesInFutureEstimateOfValueInUse_ec1f5ea5-0a55-4527-b7db-0a56ca9e95ef" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DescriptionOfRiskWeightedAssetsAsPercentageOfTotalAssetsInCurrentEstimateOfValueInUse_06f0eb3d-e41e-49a1-a1f3-5171255ab2a0" xlink:href="hsbc-20260630.xsd#hsbc_DescriptionOfRiskWeightedAssetsAsPercentageOfTotalAssetsInCurrentEstimateOfValueInUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_hsbc_DescriptionOfRiskWeightedAssetsAsPercentageOfTotalAssetsInCurrentEstimateOfValueInUse_06f0eb3d-e41e-49a1-a1f3-5171255ab2a0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DescriptionOfRiskWeightedAssetsAsPercentageOfTotalAssetsInFutureEstimateOfValueInUse_db091bb4-bb49-4807-ad28-9c45a01ad632" xlink:href="hsbc-20260630.xsd#hsbc_DescriptionOfRiskWeightedAssetsAsPercentageOfTotalAssetsInFutureEstimateOfValueInUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_hsbc_DescriptionOfRiskWeightedAssetsAsPercentageOfTotalAssetsInFutureEstimateOfValueInUse_db091bb4-bb49-4807-ad28-9c45a01ad632" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DescriptionOfLoansAndAdvancesToCustomerGrowthRateUsedInCurrentEstimateOfValueInUse_8ebb0627-4337-4bc1-8b39-3ad5602c8327" xlink:href="hsbc-20260630.xsd#hsbc_DescriptionOfLoansAndAdvancesToCustomerGrowthRateUsedInCurrentEstimateOfValueInUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_hsbc_DescriptionOfLoansAndAdvancesToCustomerGrowthRateUsedInCurrentEstimateOfValueInUse_8ebb0627-4337-4bc1-8b39-3ad5602c8327" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OperatingIncomeRatio_ff7cb084-2ca5-45d1-af2c-3a8b5e13fb27" xlink:href="hsbc-20260630.xsd#hsbc_OperatingIncomeRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_hsbc_OperatingIncomeRatio_ff7cb084-2ca5-45d1-af2c-3a8b5e13fb27" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DescriptionOfCostIncomeRatioUsedInCurrentEstimateOfValueInUse_4f264963-21b4-4f46-943a-100c2a37eb24" xlink:href="hsbc-20260630.xsd#hsbc_DescriptionOfCostIncomeRatioUsedInCurrentEstimateOfValueInUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_hsbc_DescriptionOfCostIncomeRatioUsedInCurrentEstimateOfValueInUse_4f264963-21b4-4f46-943a-100c2a37eb24" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DescriptionOfLongTermEffectiveTaxRateInFutureEstimateOfValueInUse_1a92179a-7444-4eee-8cf6-ae1c4f38f7dc" xlink:href="hsbc-20260630.xsd#hsbc_DescriptionOfLongTermEffectiveTaxRateInFutureEstimateOfValueInUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_hsbc_DescriptionOfLongTermEffectiveTaxRateInFutureEstimateOfValueInUse_1a92179a-7444-4eee-8cf6-ae1c4f38f7dc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DescriptionOfCapitalAdequacyRatioInCurrentEstimateOfValueInUse_5c629360-9d51-43e2-8dd1-6a795b9615bc" xlink:href="hsbc-20260630.xsd#hsbc_DescriptionOfCapitalAdequacyRatioInCurrentEstimateOfValueInUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_hsbc_DescriptionOfCapitalAdequacyRatioInCurrentEstimateOfValueInUse_5c629360-9d51-43e2-8dd1-6a795b9615bc" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DescriptionOfTier1CapitalAdequacyRatioInCurrentEstimateOfValueInUse_b00455f4-d3aa-4d08-b53f-ed12593b3259" xlink:href="hsbc-20260630.xsd#hsbc_DescriptionOfTier1CapitalAdequacyRatioInCurrentEstimateOfValueInUse"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_hsbc_DescriptionOfTier1CapitalAdequacyRatioInCurrentEstimateOfValueInUse_b00455f4-d3aa-4d08-b53f-ed12593b3259" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseInBasisPointsDueToReasonablyPossibleFavourableChangesInKeyAssumptions_738a8af7-5f2e-4f56-82dd-bbac4f60ce22" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseInBasisPointsDueToReasonablyPossibleFavourableChangesInKeyAssumptions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_hsbc_IncreaseDecreaseInBasisPointsDueToReasonablyPossibleFavourableChangesInKeyAssumptions_738a8af7-5f2e-4f56-82dd-bbac4f60ce22" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RecoverableAmountOfAssetOrCashgeneratingUnit_32b14af5-051c-4407-b808-7c9150542218" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RecoverableAmountOfAssetOrCashgeneratingUnit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_ifrs-full_RecoverableAmountOfAssetOrCashgeneratingUnit_32b14af5-051c-4407-b808-7c9150542218" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_FairValueOfInvestmentsInAssociatesForWhichThereAreQuotedMarketPricesOverFiveYears_8f7c8e60-3219-4aff-b9f7-56c301da6521" xlink:href="hsbc-20260630.xsd#hsbc_FairValueOfInvestmentsInAssociatesForWhichThereAreQuotedMarketPricesOverFiveYears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_hsbc_FairValueOfInvestmentsInAssociatesForWhichThereAreQuotedMarketPricesOverFiveYears_8f7c8e60-3219-4aff-b9f7-56c301da6521" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInAssociate_8be8ccad-9d77-47a5-9ae7-e8f33e02ab57" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInAssociate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfSignificantInvestmentsInAssociatesLineItems_95b1e48e-9a1e-4555-b5fb-cbf993cf6133" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInAssociate_8be8ccad-9d77-47a5-9ae7-e8f33e02ab57" xlink:type="arc" order="16"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ProvisionsDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ProvisionsDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ProvisionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOtherProvisionsLineItems_f132094f-052e-4e7f-bc72-c61cf1000ee3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOtherProvisionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOtherProvisionsTable_fe9f676f-cf2c-43d9-bca6-d010584ee7d1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfOtherProvisionsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfOtherProvisionsLineItems_f132094f-052e-4e7f-bc72-c61cf1000ee3" xlink:to="loc_ifrs-full_DisclosureOfOtherProvisionsTable_fe9f676f-cf2c-43d9-bca6-d010584ee7d1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfProvisionsAxis_281f7d45-a47f-40d3-8fdc-333720e886d4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfProvisionsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOtherProvisionsTable_fe9f676f-cf2c-43d9-bca6-d010584ee7d1" xlink:to="loc_ifrs-full_ClassesOfProvisionsAxis_281f7d45-a47f-40d3-8fdc-333720e886d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfOtherProvisionsDomain_281f7d45-a47f-40d3-8fdc-333720e886d4_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfOtherProvisionsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfProvisionsAxis_281f7d45-a47f-40d3-8fdc-333720e886d4" xlink:to="loc_ifrs-full_ClassesOfOtherProvisionsDomain_281f7d45-a47f-40d3-8fdc-333720e886d4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfOtherProvisionsDomain_4b7b228f-0d31-4245-a703-95408179638f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfOtherProvisionsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfProvisionsAxis_281f7d45-a47f-40d3-8fdc-333720e886d4" xlink:to="loc_ifrs-full_ClassesOfOtherProvisionsDomain_4b7b228f-0d31-4245-a703-95408179638f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ProvisionsExcludingContractualCommitmentsMember_3fbb6b92-0720-4759-aaa2-6fa19ab58026" xlink:href="hsbc-20260630.xsd#hsbc_ProvisionsExcludingContractualCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfOtherProvisionsDomain_4b7b228f-0d31-4245-a703-95408179638f" xlink:to="loc_hsbc_ProvisionsExcludingContractualCommitmentsMember_3fbb6b92-0720-4759-aaa2-6fa19ab58026" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RestructuringProvisionMember_b896ada7-2cad-4a19-9c55-92090e7c951b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RestructuringProvisionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ProvisionsExcludingContractualCommitmentsMember_3fbb6b92-0720-4759-aaa2-6fa19ab58026" xlink:to="loc_ifrs-full_RestructuringProvisionMember_b896ada7-2cad-4a19-9c55-92090e7c951b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LegalProceedingsProvisionMember_aeda88aa-fa66-49bb-bf5d-d18f5432df45" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LegalProceedingsProvisionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ProvisionsExcludingContractualCommitmentsMember_3fbb6b92-0720-4759-aaa2-6fa19ab58026" xlink:to="loc_ifrs-full_LegalProceedingsProvisionMember_aeda88aa-fa66-49bb-bf5d-d18f5432df45" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RefundsProvisionMember_d12dcca9-6672-4f88-91c8-fd8c97a92f8b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RefundsProvisionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ProvisionsExcludingContractualCommitmentsMember_3fbb6b92-0720-4759-aaa2-6fa19ab58026" xlink:to="loc_ifrs-full_RefundsProvisionMember_d12dcca9-6672-4f88-91c8-fd8c97a92f8b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MiscellaneousOtherProvisionsMember_17162a46-22e7-4abf-acfa-94e847028129" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MiscellaneousOtherProvisionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ProvisionsExcludingContractualCommitmentsMember_3fbb6b92-0720-4759-aaa2-6fa19ab58026" xlink:to="loc_ifrs-full_MiscellaneousOtherProvisionsMember_17162a46-22e7-4abf-acfa-94e847028129" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProvisionForCreditCommitmentsMember_e4a1139c-d807-4b7b-9a6c-a412ccaeccec" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProvisionForCreditCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfOtherProvisionsDomain_4b7b228f-0d31-4245-a703-95408179638f" xlink:to="loc_ifrs-full_ProvisionForCreditCommitmentsMember_e4a1139c-d807-4b7b-9a6c-a412ccaeccec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_0b9edaa2-7b67-4cf0-98bf-e7392207fbec" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOtherProvisionsLineItems_f132094f-052e-4e7f-bc72-c61cf1000ee3" xlink:to="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_0b9edaa2-7b67-4cf0-98bf-e7392207fbec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherProvisions_3e11c8f1-d0b7-4696-b4f2-e61d6fe25b8b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_0b9edaa2-7b67-4cf0-98bf-e7392207fbec" xlink:to="loc_ifrs-full_OtherProvisions_3e11c8f1-d0b7-4696-b4f2-e61d6fe25b8b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdditionalProvisionsOtherProvisions_bcd9f638-8449-4186-a077-d0702ddcd4d1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionalProvisionsOtherProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_0b9edaa2-7b67-4cf0-98bf-e7392207fbec" xlink:to="loc_ifrs-full_AdditionalProvisionsOtherProvisions_bcd9f638-8449-4186-a077-d0702ddcd4d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProvisionUsedOtherProvisions_a9328c11-d753-4a5b-8a52-a637bcb2ea07" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProvisionUsedOtherProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_0b9edaa2-7b67-4cf0-98bf-e7392207fbec" xlink:to="loc_ifrs-full_ProvisionUsedOtherProvisions_a9328c11-d753-4a5b-8a52-a637bcb2ea07" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UnusedProvisionReversedOtherProvisions_a0033080-0476-4494-9777-131519bec50c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UnusedProvisionReversedOtherProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_0b9edaa2-7b67-4cf0-98bf-e7392207fbec" xlink:to="loc_ifrs-full_UnusedProvisionReversedOtherProvisions_a0033080-0476-4494-9777-131519bec50c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions_371270b7-e29b-4be8-9000-c96965e0fb12" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_0b9edaa2-7b67-4cf0-98bf-e7392207fbec" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesOtherProvisions_371270b7-e29b-4be8-9000-c96965e0fb12" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ChangesInOtherProvisions_295c6a5b-f829-4984-86dd-3f8dd25dc035" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ChangesInOtherProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInOtherProvisionsAbstract_0b9edaa2-7b67-4cf0-98bf-e7392207fbec" xlink:to="loc_ifrs-full_ChangesInOtherProvisions_295c6a5b-f829-4984-86dd-3f8dd25dc035" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherProvisions_58f4a094-6cb2-4897-963d-4f2dcad2b63a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherProvisions"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ContingentliabilitiescontractualcommitmentsandguaranteesDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ContingentliabilitiescontractualcommitmentsandguaranteesDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ContingentliabilitiescontractualcommitmentsandguaranteesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_d00b36f0-3bc1-4018-b9ed-3addbb8a6b93" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable_2686e598-6610-40b7-83b1-516ecf6b3cab" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_d00b36f0-3bc1-4018-b9ed-3addbb8a6b93" xlink:to="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable_2686e598-6610-40b7-83b1-516ecf6b3cab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfContingentLiabilitiesAxis_eadd0d33-6746-4b31-9a4f-9f06d9de66b8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfContingentLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable_2686e598-6610-40b7-83b1-516ecf6b3cab" xlink:to="loc_ifrs-full_ClassesOfContingentLiabilitiesAxis_eadd0d33-6746-4b31-9a4f-9f06d9de66b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfContingentLiabilitiesDomain_eadd0d33-6746-4b31-9a4f-9f06d9de66b8_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfContingentLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfContingentLiabilitiesAxis_eadd0d33-6746-4b31-9a4f-9f06d9de66b8" xlink:to="loc_ifrs-full_ClassesOfContingentLiabilitiesDomain_eadd0d33-6746-4b31-9a4f-9f06d9de66b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfContingentLiabilitiesDomain_443abe73-caf3-4f7d-b382-40aecf2d8600" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfContingentLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfContingentLiabilitiesAxis_eadd0d33-6746-4b31-9a4f-9f06d9de66b8" xlink:to="loc_ifrs-full_ClassesOfContingentLiabilitiesDomain_443abe73-caf3-4f7d-b382-40aecf2d8600" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialGuaranteeContractsMember_9a059258-225e-42e4-b321-8bdb57c41cbc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialGuaranteeContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfContingentLiabilitiesDomain_443abe73-caf3-4f7d-b382-40aecf2d8600" xlink:to="loc_ifrs-full_FinancialGuaranteeContractsMember_9a059258-225e-42e4-b321-8bdb57c41cbc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_PerformanceAndOtherGuaranteeContractsMember_56322185-e8e1-4115-8492-f0097d933cd5" xlink:href="hsbc-20260630.xsd#hsbc_PerformanceAndOtherGuaranteeContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfContingentLiabilitiesDomain_443abe73-caf3-4f7d-b382-40aecf2d8600" xlink:to="loc_hsbc_PerformanceAndOtherGuaranteeContractsMember_56322185-e8e1-4115-8492-f0097d933cd5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherContingentLiabilitiesMember_4b7a7ca4-6bba-4276-b728-669297fbaf55" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherContingentLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfContingentLiabilitiesDomain_443abe73-caf3-4f7d-b382-40aecf2d8600" xlink:to="loc_ifrs-full_OtherContingentLiabilitiesMember_4b7a7ca4-6bba-4276-b728-669297fbaf55" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_89fcd9bd-5ccb-45f0-b773-685af0a0115b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable_2686e598-6610-40b7-83b1-516ecf6b3cab" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_89fcd9bd-5ccb-45f0-b773-685af0a0115b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_89fcd9bd-5ccb-45f0-b773-685af0a0115b_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_89fcd9bd-5ccb-45f0-b773-685af0a0115b" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_89fcd9bd-5ccb-45f0-b773-685af0a0115b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_1330e76f-7736-4999-95e3-220e80ea325d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_89fcd9bd-5ccb-45f0-b773-685af0a0115b" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_1330e76f-7736-4999-95e3-220e80ea325d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DocumentaryCreditsAndShorttermTraderelatedTransactionsMember_4f94f7bf-fb77-4e59-a60d-91d406c77d1e" xlink:href="hsbc-20260630.xsd#hsbc_DocumentaryCreditsAndShorttermTraderelatedTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_1330e76f-7736-4999-95e3-220e80ea325d" xlink:to="loc_hsbc_DocumentaryCreditsAndShorttermTraderelatedTransactionsMember_4f94f7bf-fb77-4e59-a60d-91d406c77d1e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ForwardAssetPurchasesAndForwardDepositsPlacedMember_4e88b777-845a-4b8c-ad4e-e592dce28504" xlink:href="hsbc-20260630.xsd#hsbc_ForwardAssetPurchasesAndForwardDepositsPlacedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_1330e76f-7736-4999-95e3-220e80ea325d" xlink:to="loc_hsbc_ForwardAssetPurchasesAndForwardDepositsPlacedMember_4e88b777-845a-4b8c-ad4e-e592dce28504" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_StandbyFacilitiesCreditLinesAndOtherCommitmentsToLendMember_7fc5f86c-5248-4bc6-ba7f-f76a5567a512" xlink:href="hsbc-20260630.xsd#hsbc_StandbyFacilitiesCreditLinesAndOtherCommitmentsToLendMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_1330e76f-7736-4999-95e3-220e80ea325d" xlink:to="loc_hsbc_StandbyFacilitiesCreditLinesAndOtherCommitmentsToLendMember_7fc5f86c-5248-4bc6-ba7f-f76a5567a512" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoanAndOtherCreditRelatedCommitmentsMember_04325d72-f1db-47cf-a5b8-16b4f12651a4" xlink:href="hsbc-20260630.xsd#hsbc_LoanAndOtherCreditRelatedCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_1330e76f-7736-4999-95e3-220e80ea325d" xlink:to="loc_hsbc_LoanAndOtherCreditRelatedCommitmentsMember_04325d72-f1db-47cf-a5b8-16b4f12651a4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_3a412c95-adb1-4cde-91ef-5be575464141" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable_2686e598-6610-40b7-83b1-516ecf6b3cab" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_3a412c95-adb1-4cde-91ef-5be575464141" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_3a412c95-adb1-4cde-91ef-5be575464141_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_3a412c95-adb1-4cde-91ef-5be575464141" xlink:to="loc_ifrs-full_CarryingAmountMember_3a412c95-adb1-4cde-91ef-5be575464141_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_caa77a40-fdca-43e1-9dea-9d2b6a948d1b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_3a412c95-adb1-4cde-91ef-5be575464141" xlink:to="loc_ifrs-full_CarryingAmountMember_caa77a40-fdca-43e1-9dea-9d2b6a948d1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_d06cb405-7f80-4fde-99e3-e8d76e25a7cd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_caa77a40-fdca-43e1-9dea-9d2b6a948d1b" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_d06cb405-7f80-4fde-99e3-e8d76e25a7cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NewIFRSsAxis_019f4722-a21c-72c9-abef-30c9da0aa6df" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NewIFRSsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable_2686e598-6610-40b7-83b1-516ecf6b3cab" xlink:to="loc_ifrs-full_NewIFRSsAxis_019f4722-a21c-72c9-abef-30c9da0aa6df" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NewIFRSsDomain_019f4722-a21c-72c9-abef-30c9da0aa6df_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NewIFRSsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NewIFRSsAxis_019f4722-a21c-72c9-abef-30c9da0aa6df" xlink:to="loc_ifrs-full_NewIFRSsDomain_019f4722-a21c-72c9-abef-30c9da0aa6df_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NewIFRSsDomain_019f4722-a21c-7f47-9764-8281324c9f7c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NewIFRSsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NewIFRSsAxis_019f4722-a21c-72c9-abef-30c9da0aa6df" xlink:to="loc_ifrs-full_NewIFRSsDomain_019f4722-a21c-7f47-9764-8281324c9f7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IFRS9Member_019f4722-a21c-7c3f-8066-ea70efc2247b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IFRS9Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NewIFRSsDomain_019f4722-a21c-7f47-9764-8281324c9f7c" xlink:to="loc_ifrs-full_IFRS9Member_019f4722-a21c-7c3f-8066-ea70efc2247b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EstimatedFinancialEffectOfContingentLiabilities_62816dbc-4f32-495a-a79c-f1f5c881c0c8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EstimatedFinancialEffectOfContingentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_d00b36f0-3bc1-4018-b9ed-3addbb8a6b93" xlink:to="loc_ifrs-full_EstimatedFinancialEffectOfContingentLiabilities_62816dbc-4f32-495a-a79c-f1f5c881c0c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContractualCapitalCommitments_b17c6e9b-0463-4f5f-99c4-bf1e94e4facb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContractualCapitalCommitments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_d00b36f0-3bc1-4018-b9ed-3addbb8a6b93" xlink:to="loc_ifrs-full_ContractualCapitalCommitments_b17c6e9b-0463-4f5f-99c4-bf1e94e4facb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OffbalanceSheetCommitments_53b11242-052a-44ef-bed2-288bc91c1e4f" xlink:href="hsbc-20260630.xsd#hsbc_OffbalanceSheetCommitments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_d00b36f0-3bc1-4018-b9ed-3addbb8a6b93" xlink:to="loc_hsbc_OffbalanceSheetCommitments_53b11242-052a-44ef-bed2-288bc91c1e4f" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/LegalproceedingsandregulatorymattersDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#LegalproceedingsandregulatorymattersDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/LegalproceedingsandregulatorymattersDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable_019f1e4c-3efa-75a0-a292-f5790ced02f8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfContingentLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable_019f1e4c-3efa-75a0-a292-f5790ced02f8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CounterpartyNameAxis_019f1e4c-3efa-7ff2-8645-e9b521ead844" 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_ifrs-full_DisclosureOfContingentLiabilitiesTable_019f1e4c-3efa-75a0-a292-f5790ced02f8" xlink:to="loc_srt_CounterpartyNameAxis_019f1e4c-3efa-7ff2-8645-e9b521ead844" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1e4c-3efa-7ff2-8645-e9b521ead844_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_019f1e4c-3efa-7ff2-8645-e9b521ead844" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1e4c-3efa-7ff2-8645-e9b521ead844_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1e4c-3efa-739e-9bc3-53bfc2986103" 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_019f1e4c-3efa-7ff2-8645-e9b521ead844" xlink:to="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1e4c-3efa-739e-9bc3-53bfc2986103" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_MadoffSecuritiesMember_019f1e4c-3efa-73f9-8642-eef33f678ca3" xlink:href="hsbc-20260630.xsd#hsbc_MadoffSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1e4c-3efa-739e-9bc3-53bfc2986103" xlink:to="loc_hsbc_MadoffSecuritiesMember_019f1e4c-3efa-73f9-8642-eef33f678ca3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_FairfieldMember_019f1e4c-3efa-7264-9de8-870193bf3a41" xlink:href="hsbc-20260630.xsd#hsbc_FairfieldMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1e4c-3efa-739e-9bc3-53bfc2986103" xlink:to="loc_hsbc_FairfieldMember_019f1e4c-3efa-7264-9de8-870193bf3a41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HeraldFundSPCMember_019f1e4c-3efa-751b-a7b0-744a08ff256b" xlink:href="hsbc-20260630.xsd#hsbc_HeraldFundSPCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1e4c-3efa-739e-9bc3-53bfc2986103" xlink:to="loc_hsbc_HeraldFundSPCMember_019f1e4c-3efa-751b-a7b0-744a08ff256b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_AlphaPrimeFundLimitedMember_019f1e4c-3efa-7c87-8348-4f9ee17b4723" xlink:href="hsbc-20260630.xsd#hsbc_AlphaPrimeFundLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1e4c-3efa-739e-9bc3-53bfc2986103" xlink:to="loc_hsbc_AlphaPrimeFundLimitedMember_019f1e4c-3efa-7c87-8348-4f9ee17b4723" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_SenatorFundSPCMember_019f1e4c-3efa-72fa-9b92-0539414fe584" xlink:href="hsbc-20260630.xsd#hsbc_SenatorFundSPCMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1e4c-3efa-739e-9bc3-53bfc2986103" xlink:to="loc_hsbc_SenatorFundSPCMember_019f1e4c-3efa-72fa-9b92-0539414fe584" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OntarioAndQuebecSuperiorCourtsMember_019f1e4e-7944-7539-8413-1a88a3e3a0d3" xlink:href="hsbc-20260630.xsd#hsbc_OntarioAndQuebecSuperiorCourtsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RepurchaseAgreementCounterpartyNameDomain_019f1e4c-3efa-739e-9bc3-53bfc2986103" xlink:to="loc_hsbc_OntarioAndQuebecSuperiorCourtsMember_019f1e4e-7944-7539-8413-1a88a3e3a0d3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019f1e4c-3efa-7b28-b062-5b0ef887384d" 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_ifrs-full_DisclosureOfContingentLiabilitiesTable_019f1e4c-3efa-75a0-a292-f5790ced02f8" xlink:to="loc_dei_LegalEntityAxis_019f1e4c-3efa-7b28-b062-5b0ef887384d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019f1e4c-3efa-7b28-b062-5b0ef887384d_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_019f1e4c-3efa-7b28-b062-5b0ef887384d" xlink:to="loc_dei_EntityDomain_019f1e4c-3efa-7b28-b062-5b0ef887384d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019f1e4c-3efa-7156-83bc-38a3f5eda871" 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_019f1e4c-3efa-7b28-b062-5b0ef887384d" xlink:to="loc_dei_EntityDomain_019f1e4c-3efa-7156-83bc-38a3f5eda871" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCPrivateBankSuisseSAMember_019f1e4c-3efa-7084-a88f-124b35e54758" xlink:href="hsbc-20260630.xsd#hsbc_HSBCPrivateBankSuisseSAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019f1e4c-3efa-7156-83bc-38a3f5eda871" xlink:to="loc_hsbc_HSBCPrivateBankSuisseSAMember_019f1e4c-3efa-7084-a88f-124b35e54758" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCBankUSAN.A.Member_019f1e4c-3efa-7b3d-b09f-f2f661449bb6" xlink:href="hsbc-20260630.xsd#hsbc_HSBCBankUSAN.A.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019f1e4c-3efa-7156-83bc-38a3f5eda871" xlink:to="loc_hsbc_HSBCBankUSAN.A.Member_019f1e4c-3efa-7b3d-b09f-f2f661449bb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCSecuritiesServicesLuxembourgS.A.Member_019f1e4c-3efa-7e80-ac4c-337ebdeda390" xlink:href="hsbc-20260630.xsd#hsbc_HSBCSecuritiesServicesLuxembourgS.A.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019f1e4c-3efa-7156-83bc-38a3f5eda871" xlink:to="loc_hsbc_HSBCSecuritiesServicesLuxembourgS.A.Member_019f1e4c-3efa-7e80-ac4c-337ebdeda390" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HongkongAndShanghaiBankingCorporationMember_019f1e4f-2198-7493-9a02-04059885a3e2" xlink:href="hsbc-20260630.xsd#hsbc_HongkongAndShanghaiBankingCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019f1e4c-3efa-7156-83bc-38a3f5eda871" xlink:to="loc_hsbc_HongkongAndShanghaiBankingCorporationMember_019f1e4f-2198-7493-9a02-04059885a3e2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis_019f1e4c-3efa-7913-a48d-2465511843f4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable_019f1e4c-3efa-75a0-a292-f5790ced02f8" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsAxis_019f1e4c-3efa-7913-a48d-2465511843f4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f1e4c-3efa-7913-a48d-2465511843f4_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_019f1e4c-3efa-7913-a48d-2465511843f4" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f1e4c-3efa-7913-a48d-2465511843f4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f1e4c-3efa-7d5b-a708-9393a7ed2c41" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_019f1e4c-3efa-7913-a48d-2465511843f4" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f1e4c-3efa-7d5b-a708-9393a7ed2c41" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CashAndSecuritiesMember_019f1e4c-3efa-73f4-bfee-a9a2b5c560c7" xlink:href="hsbc-20260630.xsd#hsbc_CashAndSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019f1e4c-3efa-7d5b-a708-9393a7ed2c41" xlink:to="loc_hsbc_CashAndSecuritiesMember_019f1e4c-3efa-73f4-bfee-a9a2b5c560c7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfProvisionsAxis_019f1e4c-3efa-740d-a952-63948c1ca6fb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfProvisionsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable_019f1e4c-3efa-75a0-a292-f5790ced02f8" xlink:to="loc_ifrs-full_ClassesOfProvisionsAxis_019f1e4c-3efa-740d-a952-63948c1ca6fb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfOtherProvisionsDomain_019f1e4c-3efa-740d-a952-63948c1ca6fb_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfOtherProvisionsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfProvisionsAxis_019f1e4c-3efa-740d-a952-63948c1ca6fb" xlink:to="loc_ifrs-full_ClassesOfOtherProvisionsDomain_019f1e4c-3efa-740d-a952-63948c1ca6fb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfOtherProvisionsDomain_019f1e4c-3efa-722e-938c-79856ce91649" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfOtherProvisionsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfProvisionsAxis_019f1e4c-3efa-740d-a952-63948c1ca6fb" xlink:to="loc_ifrs-full_ClassesOfOtherProvisionsDomain_019f1e4c-3efa-722e-938c-79856ce91649" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LegalProceedingsProvisionMember_019f1e4c-3efa-7b19-9851-3f8c62ec3c4b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LegalProceedingsProvisionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfOtherProvisionsDomain_019f1e4c-3efa-722e-938c-79856ce91649" xlink:to="loc_ifrs-full_LegalProceedingsProvisionMember_019f1e4c-3efa-7b19-9851-3f8c62ec3c4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ItemsOfContingentLiabilitiesAxis_019f1e4c-3efa-74a1-b859-12c78934cea5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ItemsOfContingentLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesTable_019f1e4c-3efa-75a0-a292-f5790ced02f8" xlink:to="loc_ifrs-full_ItemsOfContingentLiabilitiesAxis_019f1e4c-3efa-74a1-b859-12c78934cea5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ItemsOfContingentLiabilitiesDomain_019f1e4c-3efa-74a1-b859-12c78934cea5_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ItemsOfContingentLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ItemsOfContingentLiabilitiesAxis_019f1e4c-3efa-74a1-b859-12c78934cea5" xlink:to="loc_ifrs-full_ItemsOfContingentLiabilitiesDomain_019f1e4c-3efa-74a1-b859-12c78934cea5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ItemsOfContingentLiabilitiesDomain_019f1e4c-3efa-7185-b4b4-b9b412a19ef0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ItemsOfContingentLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ItemsOfContingentLiabilitiesAxis_019f1e4c-3efa-74a1-b859-12c78934cea5" xlink:to="loc_ifrs-full_ItemsOfContingentLiabilitiesDomain_019f1e4c-3efa-7185-b4b4-b9b412a19ef0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_RestitutionOfSecuritiesMember_019f1e4c-3efa-7aab-9c26-8ad5c7d8df5c" xlink:href="hsbc-20260630.xsd#hsbc_RestitutionOfSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ItemsOfContingentLiabilitiesDomain_019f1e4c-3efa-7185-b4b4-b9b412a19ef0" xlink:to="loc_hsbc_RestitutionOfSecuritiesMember_019f1e4c-3efa-7aab-9c26-8ad5c7d8df5c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_USAntiTerrorismActLitigationMember_019f1e4c-3efa-7ec1-8fb4-4b40a845285d" xlink:href="hsbc-20260630.xsd#hsbc_USAntiTerrorismActLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ItemsOfContingentLiabilitiesDomain_019f1e4c-3efa-7185-b4b4-b9b412a19ef0" xlink:to="loc_hsbc_USAntiTerrorismActLitigationMember_019f1e4c-3efa-7ec1-8fb4-4b40a845285d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BenchmarkRateLitigationMember_019f1e4c-5fb0-759e-bbe6-097773557cfa" xlink:href="hsbc-20260630.xsd#hsbc_BenchmarkRateLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ItemsOfContingentLiabilitiesDomain_019f1e4c-3efa-7185-b4b4-b9b412a19ef0" xlink:to="loc_hsbc_BenchmarkRateLitigationMember_019f1e4c-5fb0-759e-bbe6-097773557cfa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ForeignExchangeRelatedInvestigationsAndLitigationMember_019f1e4d-5011-74f9-ba9a-0bc504b88fb3" xlink:href="hsbc-20260630.xsd#hsbc_ForeignExchangeRelatedInvestigationsAndLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ItemsOfContingentLiabilitiesDomain_019f1e4c-3efa-7185-b4b4-b9b412a19ef0" xlink:to="loc_hsbc_ForeignExchangeRelatedInvestigationsAndLitigationMember_019f1e4d-5011-74f9-ba9a-0bc504b88fb3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_KoreanShortSellingInvestigationMember_019f1e4f-2198-746a-9802-08bfbb489c69" xlink:href="hsbc-20260630.xsd#hsbc_KoreanShortSellingInvestigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ItemsOfContingentLiabilitiesDomain_019f1e4c-3efa-7185-b4b4-b9b412a19ef0" xlink:to="loc_hsbc_KoreanShortSellingInvestigationMember_019f1e4f-2198-746a-9802-08bfbb489c69" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InvestigationsInvolvingHSBCPrivateBankSuisseSAMember_019f1e4f-6292-7ca5-a41d-d904d8be0644" xlink:href="hsbc-20260630.xsd#hsbc_InvestigationsInvolvingHSBCPrivateBankSuisseSAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ItemsOfContingentLiabilitiesDomain_019f1e4c-3efa-7185-b4b4-b9b412a19ef0" xlink:to="loc_hsbc_InvestigationsInvolvingHSBCPrivateBankSuisseSAMember_019f1e4f-6292-7ca5-a41d-d904d8be0644" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_PreciousMetalsFixRelatedLitigationMember_019f1e50-3788-7ace-9514-1040b899e8cb" xlink:href="hsbc-20260630.xsd#hsbc_PreciousMetalsFixRelatedLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ItemsOfContingentLiabilitiesDomain_019f1e4c-3efa-7185-b4b4-b9b412a19ef0" xlink:to="loc_hsbc_PreciousMetalsFixRelatedLitigationMember_019f1e50-3788-7ace-9514-1040b899e8cb" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_UnitedStatesMortgageSecuritisationLitigationMember_019f1e50-4b21-7cf3-bc2e-e643640a73a2" xlink:href="hsbc-20260630.xsd#hsbc_UnitedStatesMortgageSecuritisationLitigationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ItemsOfContingentLiabilitiesDomain_019f1e4c-3efa-7185-b4b4-b9b412a19ef0" xlink:to="loc_hsbc_UnitedStatesMortgageSecuritisationLitigationMember_019f1e50-4b21-7cf3-bc2e-e643640a73a2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EstimatedFinancialEffectOfContingentLiabilities_019f1e4c-3efa-7825-bd0d-6c1c5eb2a7ca" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EstimatedFinancialEffectOfContingentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_ifrs-full_EstimatedFinancialEffectOfContingentLiabilities_019f1e4c-3efa-7825-bd0d-6c1c5eb2a7ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ContingentLiabilitiesDismissed_019f1e4c-3efa-7b3f-9e2c-6869ab237d15" xlink:href="hsbc-20260630.xsd#hsbc_ContingentLiabilitiesDismissed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_hsbc_ContingentLiabilitiesDismissed_019f1e4c-3efa-7b3f-9e2c-6869ab237d15" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherProvisions_019f1e4c-3efa-7f3d-9a03-c6a1b3b6d125" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherProvisions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_ifrs-full_OtherProvisions_019f1e4c-3efa-7f3d-9a03-c6a1b3b6d125" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LossContingencyNumberOfHearings_019f1e4c-3efa-73c8-89f7-9366918f870f" xlink:href="hsbc-20260630.xsd#hsbc_LossContingencyNumberOfHearings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_hsbc_LossContingencyNumberOfHearings_019f1e4c-3efa-73c8-89f7-9366918f870f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LossContingencyClaimsDismissedNumber1_019f1e4c-3efa-7731-9a32-406457154dd8" xlink:href="hsbc-20260630.xsd#hsbc_LossContingencyClaimsDismissedNumber1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_hsbc_LossContingencyClaimsDismissedNumber1_019f1e4c-3efa-7731-9a32-406457154dd8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LossContingencyNumberOfHearingsInEarlyProceduralStage_019f1e4c-3efa-75cc-81a8-c51d46df1a81" xlink:href="hsbc-20260630.xsd#hsbc_LossContingencyNumberOfHearingsInEarlyProceduralStage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_hsbc_LossContingencyNumberOfHearingsInEarlyProceduralStage_019f1e4c-3efa-75cc-81a8-c51d46df1a81" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LossContingencyNumberOfUSDollarLiborRelatedActionsSeekingDamages_019f1e4c-5fb0-734b-b54a-bc9b09da2a76" xlink:href="hsbc-20260630.xsd#hsbc_LossContingencyNumberOfUSDollarLiborRelatedActionsSeekingDamages"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_hsbc_LossContingencyNumberOfUSDollarLiborRelatedActionsSeekingDamages_019f1e4c-5fb0-734b-b54a-bc9b09da2a76" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LossContingencyDamagesSought1_019f1e4e-1651-7ba3-9d63-ee59ff08d3a6" xlink:href="hsbc-20260630.xsd#hsbc_LossContingencyDamagesSought1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_hsbc_LossContingencyDamagesSought1_019f1e4e-1651-7ba3-9d63-ee59ff08d3a6" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_EstimatedFinancialEffectOfContingentLiabilitiesPunitiveDamages_019f1e4e-9f3b-7d01-abf7-81136a00152c" xlink:href="hsbc-20260630.xsd#hsbc_EstimatedFinancialEffectOfContingentLiabilitiesPunitiveDamages"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_hsbc_EstimatedFinancialEffectOfContingentLiabilitiesPunitiveDamages_019f1e4e-9f3b-7d01-abf7-81136a00152c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NumberOfCurrentAndFormerEmployees_019f1e4f-2198-78f5-a166-90fe9b1e61c2" xlink:href="hsbc-20260630.xsd#hsbc_NumberOfCurrentAndFormerEmployees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_hsbc_NumberOfCurrentAndFormerEmployees_019f1e4f-2198-78f5-a166-90fe9b1e61c2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NumberOfHistoricalBankingRelationships_019f1e4f-bc00-73f9-8fd4-ae568276ab1b" xlink:href="hsbc-20260630.xsd#hsbc_NumberOfHistoricalBankingRelationships"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_hsbc_NumberOfHistoricalBankingRelationships_019f1e4f-bc00-73f9-8fd4-ae568276ab1b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NumberOfEmployeesInvolvedInLitigation_019f1e50-3788-79d3-80b0-0b92abbb3be6" xlink:href="hsbc-20260630.xsd#hsbc_NumberOfEmployeesInvolvedInLitigation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_hsbc_NumberOfEmployeesInvolvedInLitigation_019f1e50-3788-79d3-80b0-0b92abbb3be6" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NumberOfCompaniesInvolvedInLitigation_019f46cd-1600-77ec-bbdc-7843fa2ad762" xlink:href="hsbc-20260630.xsd#hsbc_NumberOfCompaniesInvolvedInLitigation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_hsbc_NumberOfCompaniesInvolvedInLitigation_019f46cd-1600-77ec-bbdc-7843fa2ad762" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NumberOfMortgageSecuritisationTrusts_019f1e50-4b21-7b6f-8046-f5590cb1f274" xlink:href="hsbc-20260630.xsd#hsbc_NumberOfMortgageSecuritisationTrusts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_hsbc_NumberOfMortgageSecuritisationTrusts_019f1e50-4b21-7b6f-8046-f5590cb1f274" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LossContingencyNumberOfPendingActions_019f1e50-4b21-71be-bec1-d7c7c96a17c1" xlink:href="hsbc-20260630.xsd#hsbc_LossContingencyNumberOfPendingActions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfContingentLiabilitiesLineItems_019f1e4c-3efa-72a5-8208-cbdc5765e52b" xlink:to="loc_hsbc_LossContingencyNumberOfPendingActions_019f1e50-4b21-71be-bec1-d7c7c96a17c1" xlink:type="arc" order="14"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/AssetsheldforsaleliabilitiesofdisposalgroupsheldforsaleandbusinessacquisitionsNarrativeDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#AssetsheldforsaleliabilitiesofdisposalgroupsheldforsaleandbusinessacquisitionsNarrativeDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/AssetsheldforsaleliabilitiesofdisposalgroupsheldforsaleandbusinessacquisitionsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_019f1e80-8e68-7772-b9a1-5504908f8185" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_019f1e80-8e68-716b-baa7-f535533a7264" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_019f1e80-8e68-7772-b9a1-5504908f8185" xlink:to="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_019f1e80-8e68-716b-baa7-f535533a7264" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameAxis_019f1e80-8e68-70fb-8410-c870cd8246e3" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_019f1e80-8e68-716b-baa7-f535533a7264" xlink:to="loc_hsbc_DisposalGroupNameAxis_019f1e80-8e68-70fb-8410-c870cd8246e3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameDomain_019f1e80-8e68-70fb-8410-c870cd8246e3_default" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_DisposalGroupNameAxis_019f1e80-8e68-70fb-8410-c870cd8246e3" xlink:to="loc_hsbc_DisposalGroupNameDomain_019f1e80-8e68-70fb-8410-c870cd8246e3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameDomain_019f1e80-8e68-741f-b478-be99b1362d4c" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_DisposalGroupNameAxis_019f1e80-8e68-70fb-8410-c870cd8246e3" xlink:to="loc_hsbc_DisposalGroupNameDomain_019f1e80-8e68-741f-b478-be99b1362d4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCBankMaltaP.l.c.Member_019f1e80-8e68-7f5b-b687-6d4b431ae778" xlink:href="hsbc-20260630.xsd#hsbc_HSBCBankMaltaP.l.c.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_019f1e80-8e68-741f-b478-be99b1362d4c" xlink:to="loc_hsbc_HSBCBankMaltaP.l.c.Member_019f1e80-8e68-7f5b-b687-6d4b431ae778" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_UKLifeInsuranceBusinessMember_019f1e80-8e68-7d50-aafa-8f374e0805e2" xlink:href="hsbc-20260630.xsd#hsbc_UKLifeInsuranceBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_019f1e80-8e68-741f-b478-be99b1362d4c" xlink:to="loc_hsbc_UKLifeInsuranceBusinessMember_019f1e80-8e68-7d50-aafa-8f374e0805e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_SriLankaRetailBankingBusinessMember_019f7007-669e-7ae6-befd-a18fb4b41085" xlink:href="hsbc-20260630.xsd#hsbc_SriLankaRetailBankingBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_019f1e80-8e68-741f-b478-be99b1362d4c" xlink:to="loc_hsbc_SriLankaRetailBankingBusinessMember_019f7007-669e-7ae6-befd-a18fb4b41085" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_EgyptRetailBankingBusinessMember_019fc747-19db-7d59-9d8f-cee4359d27fa" xlink:href="hsbc-20260630.xsd#hsbc_EgyptRetailBankingBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_019f1e80-8e68-741f-b478-be99b1362d4c" xlink:to="loc_hsbc_EgyptRetailBankingBusinessMember_019fc747-19db-7d59-9d8f-cee4359d27fa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_AustralianHomeAndPersonalLoansPortfolioMember_019fc747-fc33-7756-8aea-8bdd8d3506df" xlink:href="hsbc-20260630.xsd#hsbc_AustralianHomeAndPersonalLoansPortfolioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_019f1e80-8e68-741f-b478-be99b1362d4c" xlink:to="loc_hsbc_AustralianHomeAndPersonalLoansPortfolioMember_019fc747-fc33-7756-8aea-8bdd8d3506df" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_SingaporeLifeInsuranceBusinessMember_019fa3fa-0279-7855-ac85-c1198247fa34" xlink:href="hsbc-20260630.xsd#hsbc_SingaporeLifeInsuranceBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_019f1e80-8e68-741f-b478-be99b1362d4c" xlink:to="loc_hsbc_SingaporeLifeInsuranceBusinessMember_019fa3fa-0279-7855-ac85-c1198247fa34" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCBankUruguayS.A.Member_019f1e80-8e68-77b1-b48c-67dec4ed4e4c" xlink:href="hsbc-20260630.xsd#hsbc_HSBCBankUruguayS.A.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_019f1e80-8e68-741f-b478-be99b1362d4c" xlink:to="loc_hsbc_HSBCBankUruguayS.A.Member_019f1e80-8e68-77b1-b48c-67dec4ed4e4c" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_PTBankHSBCIndonesiaMember_019f1e80-8e68-7957-aa5e-79b9b2d641a3" xlink:href="hsbc-20260630.xsd#hsbc_PTBankHSBCIndonesiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_019f1e80-8e68-741f-b478-be99b1362d4c" xlink:to="loc_hsbc_PTBankHSBCIndonesiaMember_019f1e80-8e68-7957-aa5e-79b9b2d641a3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BusinessInSouthAfricaMember_019f1e80-8e68-7e41-bea0-ad60068f52b9" xlink:href="hsbc-20260630.xsd#hsbc_BusinessInSouthAfricaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_019f1e80-8e68-741f-b478-be99b1362d4c" xlink:to="loc_hsbc_BusinessInSouthAfricaMember_019f1e80-8e68-7e41-bea0-ad60068f52b9" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_GermanCustodyBusinessMember_019f1e80-f3f3-79a1-95ce-d7056474f7bd" xlink:href="hsbc-20260630.xsd#hsbc_GermanCustodyBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_019f1e80-8e68-741f-b478-be99b1362d4c" xlink:to="loc_hsbc_GermanCustodyBusinessMember_019f1e80-f3f3-79a1-95ce-d7056474f7bd" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019f1e80-8e68-793f-bbf5-3b01b6ecfba4" 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_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_019f1e80-8e68-716b-baa7-f535533a7264" xlink:to="loc_dei_LegalEntityAxis_019f1e80-8e68-793f-bbf5-3b01b6ecfba4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019f1e80-8e68-793f-bbf5-3b01b6ecfba4_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_019f1e80-8e68-793f-bbf5-3b01b6ecfba4" xlink:to="loc_dei_EntityDomain_019f1e80-8e68-793f-bbf5-3b01b6ecfba4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019f1e80-8e68-7640-b55e-9bf852f77ebe" 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_019f1e80-8e68-793f-bbf5-3b01b6ecfba4" xlink:to="loc_dei_EntityDomain_019f1e80-8e68-7640-b55e-9bf852f77ebe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCBankEgyptS.A.E.Member_019fc747-19db-70fd-bb10-b5c66c732571" xlink:href="hsbc-20260630.xsd#hsbc_HSBCBankEgyptS.A.E.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019f1e80-8e68-7640-b55e-9bf852f77ebe" xlink:to="loc_hsbc_HSBCBankEgyptS.A.E.Member_019fc747-19db-70fd-bb10-b5c66c732571" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCAustrailiaMember_019fc746-c56e-7020-811e-112a76f3e5b7" xlink:href="hsbc-20260630.xsd#hsbc_HSBCAustrailiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019f1e80-8e68-7640-b55e-9bf852f77ebe" xlink:to="loc_hsbc_HSBCAustrailiaMember_019fc746-c56e-7020-811e-112a76f3e5b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCInsuranceAsiaPacificHoldingsLimitedMember_019fa3fa-51ed-7587-be06-73fa9091bfa3" xlink:href="hsbc-20260630.xsd#hsbc_HSBCInsuranceAsiaPacificHoldingsLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019f1e80-8e68-7640-b55e-9bf852f77ebe" xlink:to="loc_hsbc_HSBCInsuranceAsiaPacificHoldingsLimitedMember_019fa3fa-51ed-7587-be06-73fa9091bfa3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCBankplcMember_019f1e80-8e68-7fc3-9616-4ca681dca53d" xlink:href="hsbc-20260630.xsd#hsbc_HSBCBankplcMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019f1e80-8e68-7640-b55e-9bf852f77ebe" xlink:to="loc_hsbc_HSBCBankplcMember_019f1e80-8e68-7fc3-9616-4ca681dca53d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCContinentalEuropeMember_019f1e80-8e68-7000-b2a6-bc58260a22ed" xlink:href="hsbc-20260630.xsd#hsbc_HSBCContinentalEuropeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019f1e80-8e68-7640-b55e-9bf852f77ebe" xlink:to="loc_hsbc_HSBCContinentalEuropeMember_019f1e80-8e68-7000-b2a6-bc58260a22ed" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_019f1e80-8e68-75e1-b5a4-79d143b588a7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContinuingAndDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_019f1e80-8e68-716b-baa7-f535533a7264" xlink:to="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_019f1e80-8e68-75e1-b5a4-79d143b588a7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContinuingOperationsMember_019f1e80-8e68-75e1-b5a4-79d143b588a7_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContinuingOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_019f1e80-8e68-75e1-b5a4-79d143b588a7" xlink:to="loc_ifrs-full_ContinuingOperationsMember_019f1e80-8e68-75e1-b5a4-79d143b588a7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContinuingOperationsMember_019f1e80-8e68-75e1-9853-0108a7c92fd6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContinuingOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_019f1e80-8e68-75e1-b5a4-79d143b588a7" xlink:to="loc_ifrs-full_ContinuingOperationsMember_019f1e80-8e68-75e1-9853-0108a7c92fd6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DiscontinuedOperationsMember_019f1e80-8e68-72d5-8784-cd8b10284644" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ContinuingOperationsMember_019f1e80-8e68-75e1-9853-0108a7c92fd6" xlink:to="loc_ifrs-full_DiscontinuedOperationsMember_019f1e80-8e68-72d5-8784-cd8b10284644" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019f1e80-8e68-7778-8d0c-fc1b0ff9a49e" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_019f1e80-8e68-716b-baa7-f535533a7264" xlink:to="loc_srt_StatementScenarioAxis_019f1e80-8e68-7778-8d0c-fc1b0ff9a49e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019f1e80-8e68-7778-8d0c-fc1b0ff9a49e_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019f1e80-8e68-7778-8d0c-fc1b0ff9a49e" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019f1e80-8e68-7778-8d0c-fc1b0ff9a49e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019f1e80-8e68-7700-8902-5feb25e1c9ad" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019f1e80-8e68-7778-8d0c-fc1b0ff9a49e" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019f1e80-8e68-7700-8902-5feb25e1c9ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_019f1e80-8e68-77f6-a1bb-b35aa793db53" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_019f1e80-8e68-7700-8902-5feb25e1c9ad" xlink:to="loc_srt_ScenarioForecastMember_019f1e80-8e68-77f6-a1bb-b35aa793db53" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_019f1e80-8e68-7f5c-86ee-421caabe06a2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_019f1e80-8e68-716b-baa7-f535533a7264" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_019f1e80-8e68-7f5c-86ee-421caabe06a2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019f1e80-8e68-7f5c-86ee-421caabe06a2_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_019f1e80-8e68-7f5c-86ee-421caabe06a2" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019f1e80-8e68-7f5c-86ee-421caabe06a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019f1e80-8e68-77c0-b32b-664bfe881650" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_019f1e80-8e68-7f5c-86ee-421caabe06a2" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019f1e80-8e68-77c0-b32b-664bfe881650" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember_019f1e80-8e68-700f-89c3-b036bc620a63" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019f1e80-8e68-77c0-b32b-664bfe881650" xlink:to="loc_ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember_019f1e80-8e68-700f-89c3-b036bc620a63" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_019f1e80-8e68-7634-ab44-a295e9e956ca" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_019f1e80-8e68-716b-baa7-f535533a7264" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_019f1e80-8e68-7634-ab44-a295e9e956ca" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019f1e80-8e68-7634-ab44-a295e9e956ca_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_019f1e80-8e68-7634-ab44-a295e9e956ca" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019f1e80-8e68-7634-ab44-a295e9e956ca_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019f1e80-8e68-7f1d-8f20-29c929b76aaa" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_019f1e80-8e68-7634-ab44-a295e9e956ca" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019f1e80-8e68-7f1d-8f20-29c929b76aaa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisposalOfMajorSubsidiaryMember_019f1e80-8e68-75de-b614-cfbf0bcaae80" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisposalOfMajorSubsidiaryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019f1e80-8e68-7f1d-8f20-29c929b76aaa" xlink:to="loc_ifrs-full_DisposalOfMajorSubsidiaryMember_019f1e80-8e68-75de-b614-cfbf0bcaae80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_019f1e80-8e68-7498-a017-223718e5035b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_019f1e80-8e68-716b-baa7-f535533a7264" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_019f1e80-8e68-7498-a017-223718e5035b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019f1e80-8e68-7498-a017-223718e5035b_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_019f1e80-8e68-7498-a017-223718e5035b" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019f1e80-8e68-7498-a017-223718e5035b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019f1e80-8e68-7d45-aae4-d36c5dd9d6cb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_019f1e80-8e68-7498-a017-223718e5035b" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019f1e80-8e68-7d45-aae4-d36c5dd9d6cb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCBankMaltaP.l.c.Member_019f1e80-8e68-73ee-b7e2-0a09ff01d908" xlink:href="hsbc-20260630.xsd#hsbc_HSBCBankMaltaP.l.c.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019f1e80-8e68-7d45-aae4-d36c5dd9d6cb" xlink:to="loc_hsbc_HSBCBankMaltaP.l.c.Member_019f1e80-8e68-73ee-b7e2-0a09ff01d908" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation_019f1e80-8e68-7e1c-80fa-5a2e0e7337ea" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_019f1e80-8e68-7772-b9a1-5504908f8185" xlink:to="loc_ifrs-full_GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation_019f1e80-8e68-7e1c-80fa-5a2e0e7337ea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale_019f7005-8d3d-7cbb-a5d2-4a6099b57f49" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_019f1e80-8e68-7772-b9a1-5504908f8185" xlink:to="loc_ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale_019f7005-8d3d-7cbb-a5d2-4a6099b57f49" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale_019f7005-8d3d-735a-9be9-9d08f28ef199" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_019f1e80-8e68-7772-b9a1-5504908f8185" xlink:to="loc_ifrs-full_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale_019f7005-8d3d-735a-9be9-9d08f28ef199" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets_019f1e80-8e68-7d6d-b7fc-f9ecfdb4d56a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_019f1e80-8e68-7772-b9a1-5504908f8185" xlink:to="loc_ifrs-full_Assets_019f1e80-8e68-7d6d-b7fc-f9ecfdb4d56a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Liabilities_019f1e80-8e68-7fe3-b6db-41379c7adb68" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_019f1e80-8e68-7772-b9a1-5504908f8185" xlink:to="loc_ifrs-full_Liabilities_019f1e80-8e68-7fe3-b6db-41379c7adb68" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpenseOfRestructuringActivities_019fc749-104e-7609-b8e6-8ce8fb1e1cd3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpenseOfRestructuringActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_019f1e80-8e68-7772-b9a1-5504908f8185" xlink:to="loc_ifrs-full_ExpenseOfRestructuringActivities_019fc749-104e-7609-b8e6-8ce8fb1e1cd3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughForeignExchangeReclassifiedToIncomeStatementOnDisposalOfAForeignOperationEquity_019f1e80-8e68-7a9e-87e7-2df9e0bfd257" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughForeignExchangeReclassifiedToIncomeStatementOnDisposalOfAForeignOperationEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_019f1e80-8e68-7772-b9a1-5504908f8185" xlink:to="loc_hsbc_IncreaseDecreaseThroughForeignExchangeReclassifiedToIncomeStatementOnDisposalOfAForeignOperationEquity_019f1e80-8e68-7a9e-87e7-2df9e0bfd257" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InsuranceContractsIssuedThatAreLiabilities_019fa3fd-165d-7b14-b62a-3c069fa82a90" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InsuranceContractsIssuedThatAreLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_019f1e80-8e68-7772-b9a1-5504908f8185" xlink:to="loc_ifrs-full_InsuranceContractsIssuedThatAreLiabilities_019fa3fd-165d-7b14-b62a-3c069fa82a90" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_019f1e80-8e68-7356-a204-1b6c43088ab9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProportionOfOwnershipInterestInSubsidiary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_019f1e80-8e68-7772-b9a1-5504908f8185" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_019f1e80-8e68-7356-a204-1b6c43088ab9" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/AssetsheldforsaleliabilitiesofdisposalgroupsheldforsaleandbusinessacquisitionsAssetsandliabilitiesDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#AssetsheldforsaleliabilitiesofdisposalgroupsheldforsaleandbusinessacquisitionsAssetsandliabilitiesDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/AssetsheldforsaleliabilitiesofdisposalgroupsheldforsaleandbusinessacquisitionsAssetsandliabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_fda14ab8-fffd-4e52-990e-d644ac85f9a6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_0756da38-c8e6-45eb-8d9f-14bdfb04936c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_fda14ab8-fffd-4e52-990e-d644ac85f9a6" xlink:to="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_0756da38-c8e6-45eb-8d9f-14bdfb04936c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameAxis_869a9e74-f74f-438e-baf8-ced082f74132" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_0756da38-c8e6-45eb-8d9f-14bdfb04936c" xlink:to="loc_hsbc_DisposalGroupNameAxis_869a9e74-f74f-438e-baf8-ced082f74132" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameDomain_869a9e74-f74f-438e-baf8-ced082f74132_default" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_DisposalGroupNameAxis_869a9e74-f74f-438e-baf8-ced082f74132" xlink:to="loc_hsbc_DisposalGroupNameDomain_869a9e74-f74f-438e-baf8-ced082f74132_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameDomain_f1cb8fb1-d5a8-41fb-8ac3-c2c3a6bd1615" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_DisposalGroupNameAxis_869a9e74-f74f-438e-baf8-ced082f74132" xlink:to="loc_hsbc_DisposalGroupNameDomain_f1cb8fb1-d5a8-41fb-8ac3-c2c3a6bd1615" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCBankMaltaP.l.c.Member_019f1e81-bcd3-792a-9dd8-ba299b27e32f" xlink:href="hsbc-20260630.xsd#hsbc_HSBCBankMaltaP.l.c.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_f1cb8fb1-d5a8-41fb-8ac3-c2c3a6bd1615" xlink:to="loc_hsbc_HSBCBankMaltaP.l.c.Member_019f1e81-bcd3-792a-9dd8-ba299b27e32f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CustodyBusinessInGermanyMember_f6e574ec-fafd-46eb-8de0-182afa880ed0" xlink:href="hsbc-20260630.xsd#hsbc_CustodyBusinessInGermanyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_f1cb8fb1-d5a8-41fb-8ac3-c2c3a6bd1615" xlink:to="loc_hsbc_CustodyBusinessInGermanyMember_f6e574ec-fafd-46eb-8de0-182afa880ed0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCBankUruguayS.A.Member_019f1e84-44d0-77f0-a65f-c9db93f8358f" xlink:href="hsbc-20260630.xsd#hsbc_HSBCBankUruguayS.A.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_f1cb8fb1-d5a8-41fb-8ac3-c2c3a6bd1615" xlink:to="loc_hsbc_HSBCBankUruguayS.A.Member_019f1e84-44d0-77f0-a65f-c9db93f8358f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_PTBankHSBCIndonesiaMember_019f1e84-c7b5-73d0-9243-7018d5bb9a15" xlink:href="hsbc-20260630.xsd#hsbc_PTBankHSBCIndonesiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_f1cb8fb1-d5a8-41fb-8ac3-c2c3a6bd1615" xlink:to="loc_hsbc_PTBankHSBCIndonesiaMember_019f1e84-c7b5-73d0-9243-7018d5bb9a15" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_SingaporeLifeInsuranceBusinessMember_019f1e86-1bdc-74ef-ac5e-b6552d016a51" xlink:href="hsbc-20260630.xsd#hsbc_SingaporeLifeInsuranceBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_f1cb8fb1-d5a8-41fb-8ac3-c2c3a6bd1615" xlink:to="loc_hsbc_SingaporeLifeInsuranceBusinessMember_019f1e86-1bdc-74ef-ac5e-b6552d016a51" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BusinessInSouthAfricaMember_169d3b06-8019-4a17-b59e-8d1f1aa05db0" xlink:href="hsbc-20260630.xsd#hsbc_BusinessInSouthAfricaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_f1cb8fb1-d5a8-41fb-8ac3-c2c3a6bd1615" xlink:to="loc_hsbc_BusinessInSouthAfricaMember_169d3b06-8019-4a17-b59e-8d1f1aa05db0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_UKLifeInsuranceBusinessMember_019f1e8a-e283-773f-8a04-339d401add2b" xlink:href="hsbc-20260630.xsd#hsbc_UKLifeInsuranceBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_f1cb8fb1-d5a8-41fb-8ac3-c2c3a6bd1615" xlink:to="loc_hsbc_UKLifeInsuranceBusinessMember_019f1e8a-e283-773f-8a04-339d401add2b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_SriLankaRetailBankingBusinessMember_019f1f25-49fd-7c29-81f8-da122ad5074b" xlink:href="hsbc-20260630.xsd#hsbc_SriLankaRetailBankingBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_f1cb8fb1-d5a8-41fb-8ac3-c2c3a6bd1615" xlink:to="loc_hsbc_SriLankaRetailBankingBusinessMember_019f1f25-49fd-7c29-81f8-da122ad5074b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherDisposalGroupsMember_5857e2b4-0147-4221-9bcc-d1a8a7610d38" xlink:href="hsbc-20260630.xsd#hsbc_OtherDisposalGroupsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_f1cb8fb1-d5a8-41fb-8ac3-c2c3a6bd1615" xlink:to="loc_hsbc_OtherDisposalGroupsMember_5857e2b4-0147-4221-9bcc-d1a8a7610d38" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_b15c4ca7-fe48-4080-a9a5-2d7c5ddfa2c0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContinuingAndDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsTable_0756da38-c8e6-45eb-8d9f-14bdfb04936c" xlink:to="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_b15c4ca7-fe48-4080-a9a5-2d7c5ddfa2c0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContinuingOperationsMember_b15c4ca7-fe48-4080-a9a5-2d7c5ddfa2c0_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContinuingOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_b15c4ca7-fe48-4080-a9a5-2d7c5ddfa2c0" xlink:to="loc_ifrs-full_ContinuingOperationsMember_b15c4ca7-fe48-4080-a9a5-2d7c5ddfa2c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContinuingOperationsMember_c752275c-7743-4a34-b225-09278cb256a3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContinuingOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_b15c4ca7-fe48-4080-a9a5-2d7c5ddfa2c0" xlink:to="loc_ifrs-full_ContinuingOperationsMember_c752275c-7743-4a34-b225-09278cb256a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DiscontinuedOperationsMember_87fe1284-49e7-4180-a925-f36a58d9b1a3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ContinuingOperationsMember_c752275c-7743-4a34-b225-09278cb256a3" xlink:to="loc_ifrs-full_DiscontinuedOperationsMember_87fe1284-49e7-4180-a925-f36a58d9b1a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupAssetsAbstract_a69b7a44-8593-4fc3-a573-8cc38f1f035b" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_fda14ab8-fffd-4e52-990e-d644ac85f9a6" xlink:to="loc_hsbc_DisposalGroupAssetsAbstract_a69b7a44-8593-4fc3-a573-8cc38f1f035b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndBankBalancesAtCentralBanks_6cb574b0-bce2-49f1-ad7b-10ea6260f8c1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashAndBankBalancesAtCentralBanks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupAssetsAbstract_a69b7a44-8593-4fc3-a573-8cc38f1f035b" xlink:to="loc_ifrs-full_CashAndBankBalancesAtCentralBanks_6cb574b0-bce2-49f1-ad7b-10ea6260f8c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading_019f1e81-fe91-7970-95e0-46762a25df47" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupAssetsAbstract_a69b7a44-8593-4fc3-a573-8cc38f1f035b" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossClassifiedAsHeldForTrading_019f1e81-fe91-7970-95e0-46762a25df47" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValueOtherThanThoseClassifiedAsHeldForTrading_14e8ee76-87ed-417c-be56-d4be2f716d15" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValueOtherThanThoseClassifiedAsHeldForTrading"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupAssetsAbstract_a69b7a44-8593-4fc3-a573-8cc38f1f035b" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossMandatorilyMeasuredAtFairValueOtherThanThoseClassifiedAsHeldForTrading_14e8ee76-87ed-417c-be56-d4be2f716d15" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativeFinancialAssets_b9ec3931-e1f6-4744-8af5-622edbf93e27" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativeFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupAssetsAbstract_a69b7a44-8593-4fc3-a573-8cc38f1f035b" xlink:to="loc_ifrs-full_DerivativeFinancialAssets_b9ec3931-e1f6-4744-8af5-622edbf93e27" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LoansAndAdvancesToBanks_9005431e-f5ab-41a2-8b99-ad5c762d3c5c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LoansAndAdvancesToBanks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupAssetsAbstract_a69b7a44-8593-4fc3-a573-8cc38f1f035b" xlink:to="loc_ifrs-full_LoansAndAdvancesToBanks_9005431e-f5ab-41a2-8b99-ad5c762d3c5c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LoansAndAdvancesToCustomers_35c4a5cc-159e-4dc3-9475-ac508aafef37" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LoansAndAdvancesToCustomers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupAssetsAbstract_a69b7a44-8593-4fc3-a573-8cc38f1f035b" xlink:to="loc_ifrs-full_LoansAndAdvancesToCustomers_35c4a5cc-159e-4dc3-9475-ac508aafef37" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeAndAtAmortisedCost_29cbe407-78ff-479e-9c5e-7a9ef38bae63" xlink:href="hsbc-20260630.xsd#hsbc_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeAndAtAmortisedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupAssetsAbstract_a69b7a44-8593-4fc3-a573-8cc38f1f035b" xlink:to="loc_hsbc_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeAndAtAmortisedCost_29cbe407-78ff-479e-9c5e-7a9ef38bae63" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Goodwill_66f8803a-7365-45cb-ad76-4eb05d08a79d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupAssetsAbstract_a69b7a44-8593-4fc3-a573-8cc38f1f035b" xlink:to="loc_ifrs-full_Goodwill_66f8803a-7365-45cb-ad76-4eb05d08a79d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_PrepaymentsAccruedIncomeAndOtherAssets_63664101-3240-4d8b-9f2a-24a027e93f85" xlink:href="hsbc-20260630.xsd#hsbc_PrepaymentsAccruedIncomeAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupAssetsAbstract_a69b7a44-8593-4fc3-a573-8cc38f1f035b" xlink:to="loc_hsbc_PrepaymentsAccruedIncomeAndOtherAssets_63664101-3240-4d8b-9f2a-24a027e93f85" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets_1a5a89ac-cdbd-4fb8-9f72-75ac87991da9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupAssetsAbstract_a69b7a44-8593-4fc3-a573-8cc38f1f035b" xlink:to="loc_ifrs-full_Assets_1a5a89ac-cdbd-4fb8-9f72-75ac87991da9" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupLiabilitiesAbstract_19de13c5-0542-4e73-a365-d1e07dd32086" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupLiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfSingleAmountOfDiscontinuedOperationsLineItems_fda14ab8-fffd-4e52-990e-d644ac85f9a6" xlink:to="loc_hsbc_DisposalGroupLiabilitiesAbstract_19de13c5-0542-4e73-a365-d1e07dd32086" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepositsFromBanks_4b8a7605-9d1f-4871-b1e9-4026dfe5b0d6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepositsFromBanks"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupLiabilitiesAbstract_19de13c5-0542-4e73-a365-d1e07dd32086" xlink:to="loc_ifrs-full_DepositsFromBanks_4b8a7605-9d1f-4871-b1e9-4026dfe5b0d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepositsFromCustomers_3e7a4985-68b6-435a-ac42-036df7302aec" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepositsFromCustomers"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupLiabilitiesAbstract_19de13c5-0542-4e73-a365-d1e07dd32086" xlink:to="loc_ifrs-full_DepositsFromCustomers_3e7a4985-68b6-435a-ac42-036df7302aec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition_4acb2306-856b-48a9-9816-98e896491d5c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupLiabilitiesAbstract_19de13c5-0542-4e73-a365-d1e07dd32086" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition_4acb2306-856b-48a9-9816-98e896491d5c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativeFinancialLiabilities_ed09b0ed-2176-476c-a6e5-49f3876c5d78" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativeFinancialLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupLiabilitiesAbstract_19de13c5-0542-4e73-a365-d1e07dd32086" xlink:to="loc_ifrs-full_DerivativeFinancialLiabilities_ed09b0ed-2176-476c-a6e5-49f3876c5d78" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InsuranceContractsIssuedThatAreLiabilities_1c485a92-9381-4cc9-94be-957aae9fcd34" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InsuranceContractsIssuedThatAreLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupLiabilitiesAbstract_19de13c5-0542-4e73-a365-d1e07dd32086" xlink:to="loc_ifrs-full_InsuranceContractsIssuedThatAreLiabilities_1c485a92-9381-4cc9-94be-957aae9fcd34" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DebtSecurities_019f1e81-7748-7864-8e20-48d931e4b2db" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DebtSecurities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupLiabilitiesAbstract_19de13c5-0542-4e73-a365-d1e07dd32086" xlink:to="loc_ifrs-full_DebtSecurities_019f1e81-7748-7864-8e20-48d931e4b2db" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_AccrualsDeferredIncomeAndOtherLiabilities_936a172a-2016-4a07-921a-474f89eafa3c" xlink:href="hsbc-20260630.xsd#hsbc_AccrualsDeferredIncomeAndOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupLiabilitiesAbstract_19de13c5-0542-4e73-a365-d1e07dd32086" xlink:to="loc_hsbc_AccrualsDeferredIncomeAndOtherLiabilities_936a172a-2016-4a07-921a-474f89eafa3c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Liabilities_9dacc3ea-bd94-407f-ba3d-1b7b81f93b7f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupLiabilitiesAbstract_19de13c5-0542-4e73-a365-d1e07dd32086" xlink:to="loc_ifrs-full_Liabilities_9dacc3ea-bd94-407f-ba3d-1b7b81f93b7f" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/EventsafterthebalancesheetdateDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#EventsafterthebalancesheetdateDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/EventsafterthebalancesheetdateDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_019f1e5a-b048-7746-838d-0aeaf8b67f20" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_019f1e5a-b048-79cd-9cc2-0bf4fd738875" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_019f1e5a-b048-7746-838d-0aeaf8b67f20" xlink:to="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_019f1e5a-b048-79cd-9cc2-0bf4fd738875" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameAxis_019f89f9-3a0a-75e3-b11c-fea5edcbaa6a" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_019f1e5a-b048-79cd-9cc2-0bf4fd738875" xlink:to="loc_hsbc_DisposalGroupNameAxis_019f89f9-3a0a-75e3-b11c-fea5edcbaa6a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameDomain_019f89f9-3a0a-75e3-b11c-fea5edcbaa6a_default" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_DisposalGroupNameAxis_019f89f9-3a0a-75e3-b11c-fea5edcbaa6a" xlink:to="loc_hsbc_DisposalGroupNameDomain_019f89f9-3a0a-75e3-b11c-fea5edcbaa6a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameDomain_019f89f9-3a0a-7272-b268-b564e9feee61" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_DisposalGroupNameAxis_019f89f9-3a0a-75e3-b11c-fea5edcbaa6a" xlink:to="loc_hsbc_DisposalGroupNameDomain_019f89f9-3a0a-7272-b268-b564e9feee61" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCBankUruguayS.A.Member_019f89f9-3a0a-74cc-a132-22bd36a135dc" xlink:href="hsbc-20260630.xsd#hsbc_HSBCBankUruguayS.A.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_019f89f9-3a0a-7272-b268-b564e9feee61" xlink:to="loc_hsbc_HSBCBankUruguayS.A.Member_019f89f9-3a0a-74cc-a132-22bd36a135dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_SingaporeLifeInsuranceBusinessMember_019fa94a-6060-7514-bc5b-f20110c3ef45" xlink:href="hsbc-20260630.xsd#hsbc_SingaporeLifeInsuranceBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_019f89f9-3a0a-7272-b268-b564e9feee61" xlink:to="loc_hsbc_SingaporeLifeInsuranceBusinessMember_019fa94a-6060-7514-bc5b-f20110c3ef45" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_AustralianHomeAndPersonalLoansPortfolioMember_019fc74b-7058-7e77-be94-00aea405b7c4" xlink:href="hsbc-20260630.xsd#hsbc_AustralianHomeAndPersonalLoansPortfolioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_019f89f9-3a0a-7272-b268-b564e9feee61" xlink:to="loc_hsbc_AustralianHomeAndPersonalLoansPortfolioMember_019fc74b-7058-7e77-be94-00aea405b7c4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_EgyptRetailBankingBusinessMember_019fc74c-7bf6-72d5-8555-4e739efbc083" xlink:href="hsbc-20260630.xsd#hsbc_EgyptRetailBankingBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_019f89f9-3a0a-7272-b268-b564e9feee61" xlink:to="loc_hsbc_EgyptRetailBankingBusinessMember_019fc74c-7bf6-72d5-8555-4e739efbc083" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_019f89f9-3a0a-76c6-ac3d-864572695dce" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContinuingAndDiscontinuedOperationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_019f1e5a-b048-79cd-9cc2-0bf4fd738875" xlink:to="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_019f89f9-3a0a-76c6-ac3d-864572695dce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContinuingOperationsMember_019f89f9-3a0a-76c6-ac3d-864572695dce_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContinuingOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_019f89f9-3a0a-76c6-ac3d-864572695dce" xlink:to="loc_ifrs-full_ContinuingOperationsMember_019f89f9-3a0a-76c6-ac3d-864572695dce_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContinuingOperationsMember_019f89f9-3a0a-7dfb-afb9-c34113f06112" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContinuingOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ContinuingAndDiscontinuedOperationsAxis_019f89f9-3a0a-76c6-ac3d-864572695dce" xlink:to="loc_ifrs-full_ContinuingOperationsMember_019f89f9-3a0a-7dfb-afb9-c34113f06112" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DiscontinuedOperationsMember_019f89f9-3a0a-7742-b43b-025d7338ac2f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DiscontinuedOperationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ContinuingOperationsMember_019f89f9-3a0a-7dfb-afb9-c34113f06112" xlink:to="loc_ifrs-full_DiscontinuedOperationsMember_019f89f9-3a0a-7742-b43b-025d7338ac2f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019fa94a-6060-7aad-883b-86004fe0f307" 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_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_019f1e5a-b048-79cd-9cc2-0bf4fd738875" xlink:to="loc_dei_LegalEntityAxis_019fa94a-6060-7aad-883b-86004fe0f307" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019fa94a-6060-7aad-883b-86004fe0f307_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_019fa94a-6060-7aad-883b-86004fe0f307" xlink:to="loc_dei_EntityDomain_019fa94a-6060-7aad-883b-86004fe0f307_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019fa94a-6060-717f-88a5-ee5a17d2fdbd" 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_019fa94a-6060-7aad-883b-86004fe0f307" xlink:to="loc_dei_EntityDomain_019fa94a-6060-717f-88a5-ee5a17d2fdbd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCInsuranceAsiaPacificHoldingsLimitedMember_019fa94a-6060-7ffb-9eb8-14520eb56edd" xlink:href="hsbc-20260630.xsd#hsbc_HSBCInsuranceAsiaPacificHoldingsLimitedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019fa94a-6060-717f-88a5-ee5a17d2fdbd" xlink:to="loc_hsbc_HSBCInsuranceAsiaPacificHoldingsLimitedMember_019fa94a-6060-7ffb-9eb8-14520eb56edd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCAustrailiaMember_019fc74b-7058-79f3-9a4f-02a97a84e622" xlink:href="hsbc-20260630.xsd#hsbc_HSBCAustrailiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019fa94a-6060-717f-88a5-ee5a17d2fdbd" xlink:to="loc_hsbc_HSBCAustrailiaMember_019fc74b-7058-79f3-9a4f-02a97a84e622" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_HSBCBankEgyptS.A.E.Member_019fc74c-7bf6-7833-8ebc-6977fefcf199" xlink:href="hsbc-20260630.xsd#hsbc_HSBCBankEgyptS.A.E.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019fa94a-6060-717f-88a5-ee5a17d2fdbd" xlink:to="loc_hsbc_HSBCBankEgyptS.A.E.Member_019fc74c-7bf6-7833-8ebc-6977fefcf199" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_019fa94a-6060-7557-a3c9-cb5735fdb28f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_019f1e5a-b048-79cd-9cc2-0bf4fd738875" xlink:to="loc_srt_StatementScenarioAxis_019fa94a-6060-7557-a3c9-cb5735fdb28f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019fa94a-6060-7557-a3c9-cb5735fdb28f_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_019fa94a-6060-7557-a3c9-cb5735fdb28f" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019fa94a-6060-7557-a3c9-cb5735fdb28f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_019fa94a-6060-765e-80a6-77330eab6af0" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_019fa94a-6060-7557-a3c9-cb5735fdb28f" xlink:to="loc_srt_ScenarioUnspecifiedDomain_019fa94a-6060-765e-80a6-77330eab6af0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_019fa94a-6060-7ab8-a948-529045e7b2bd" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_019fa94a-6060-765e-80a6-77330eab6af0" xlink:to="loc_srt_ScenarioForecastMember_019fa94a-6060-7ab8-a948-529045e7b2bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis_019f1e5a-b048-71ea-97b9-72fd14860987" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_019f1e5a-b048-79cd-9cc2-0bf4fd738875" xlink:to="loc_ifrs-full_ClassesOfShareCapitalAxis_019f1e5a-b048-71ea-97b9-72fd14860987" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_019f1e5a-b048-71ea-97b9-72fd14860987_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_019f1e5a-b048-71ea-97b9-72fd14860987" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_019f1e5a-b048-71ea-97b9-72fd14860987_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_019f1e5a-b048-7929-a2d3-2501d61ca991" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfShareCapitalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfShareCapitalAxis_019f1e5a-b048-71ea-97b9-72fd14860987" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_019f1e5a-b048-7929-a2d3-2501d61ca991" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OrdinarySharesMember_019f1e5a-b048-7516-a52d-14f923fab856" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OrdinarySharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_019f1e5a-b048-7929-a2d3-2501d61ca991" xlink:to="loc_ifrs-full_OrdinarySharesMember_019f1e5a-b048-7516-a52d-14f923fab856" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_019f1e5a-b048-7d19-8488-d3fdbf0ec358" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodTable_019f1e5a-b048-79cd-9cc2-0bf4fd738875" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_019f1e5a-b048-7d19-8488-d3fdbf0ec358" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019f1e5a-b048-7d19-8488-d3fdbf0ec358_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_019f1e5a-b048-7d19-8488-d3fdbf0ec358" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019f1e5a-b048-7d19-8488-d3fdbf0ec358_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019f1e5a-b048-7353-8882-a86071dacd73" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NonadjustingEventsAfterReportingPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_019f1e5a-b048-7d19-8488-d3fdbf0ec358" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019f1e5a-b048-7353-8882-a86071dacd73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_SecondInterimDividend2026Member_019f1e5a-b048-7376-bf1e-8320648775c1" xlink:href="hsbc-20260630.xsd#hsbc_SecondInterimDividend2026Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019f1e5a-b048-7353-8882-a86071dacd73" xlink:to="loc_hsbc_SecondInterimDividend2026Member_019f1e5a-b048-7376-bf1e-8320648775c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MajorOrdinaryShareTransactionsMember_019fa94d-e634-71af-b246-1f86941b3dd1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MajorOrdinaryShareTransactionsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019f1e5a-b048-7353-8882-a86071dacd73" xlink:to="loc_ifrs-full_MajorOrdinaryShareTransactionsMember_019fa94d-e634-71af-b246-1f86941b3dd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets_019f89f9-3a0a-747a-8cc0-7d76e4cc9a49" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_019f1e5a-b048-7746-838d-0aeaf8b67f20" xlink:to="loc_ifrs-full_Assets_019f89f9-3a0a-747a-8cc0-7d76e4cc9a49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Liabilities_019f89f9-3a0a-78d5-bd81-43fb4415062b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_019f1e5a-b048-7746-838d-0aeaf8b67f20" xlink:to="loc_ifrs-full_Liabilities_019f89f9-3a0a-78d5-bd81-43fb4415062b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation_019fa94a-6060-7f04-9e2b-dcdded13a75a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_019f1e5a-b048-7746-838d-0aeaf8b67f20" xlink:to="loc_ifrs-full_GainLossRecognisedOnMeasurementToFairValueLessCostsToSellOrOnDisposalOfAssetsOrDisposalGroupsConstitutingDiscontinuedOperation_019fa94a-6060-7f04-9e2b-dcdded13a75a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpenseOfRestructuringActivities_019fc74b-cf5e-7681-abf2-ed2d77b4f8a2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpenseOfRestructuringActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_019f1e5a-b048-7746-838d-0aeaf8b67f20" xlink:to="loc_ifrs-full_ExpenseOfRestructuringActivities_019fc74b-cf5e-7681-abf2-ed2d77b4f8a2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughForeignExchangeReclassifiedToIncomeStatementOnDisposalOfAForeignOperationEquity_019fc74c-141f-7460-9849-63af017e8838" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughForeignExchangeReclassifiedToIncomeStatementOnDisposalOfAForeignOperationEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_019f1e5a-b048-7746-838d-0aeaf8b67f20" xlink:to="loc_hsbc_IncreaseDecreaseThroughForeignExchangeReclassifiedToIncomeStatementOnDisposalOfAForeignOperationEquity_019fc74c-141f-7460-9849-63af017e8838" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare_019f1e5a-b048-7063-95ff-3c7aaa8ce202" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_019f1e5a-b048-7746-838d-0aeaf8b67f20" xlink:to="loc_ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare_019f1e5a-b048-7063-95ff-3c7aaa8ce202" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_StockRepurchaseProgramAuthorizedAmount_019fa950-54a1-7fce-adc7-3eb3d9477436" xlink:href="hsbc-20260630.xsd#hsbc_StockRepurchaseProgramAuthorizedAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfNonadjustingEventsAfterReportingPeriodLineItems_019f1e5a-b048-7746-838d-0aeaf8b67f20" xlink:to="loc_hsbc_StockRepurchaseProgramAuthorizedAmount_019fa950-54a1-7fce-adc7-3eb3d9477436" xlink:type="arc" order="6"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportSummaryofcreditriskexcludingdebtinstrumentsmeasuredatFVOCIbystagedistributionandECLcoverageDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportSummaryofcreditriskexcludingdebtinstrumentsmeasuredatFVOCIbystagedistributionandECLcoverageDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportSummaryofcreditriskexcludingdebtinstrumentsmeasuredatFVOCIbystagedistributionandECLcoverageDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_dd760498-568d-499c-9f15-db75308d90c6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_ab2b5a03-d737-4077-88b4-a7c66428a491" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_dd760498-568d-499c-9f15-db75308d90c6" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_ab2b5a03-d737-4077-88b4-a7c66428a491" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_0df8c4f4-3c3d-49ab-9949-3ca1088abb78" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_ab2b5a03-d737-4077-88b4-a7c66428a491" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_0df8c4f4-3c3d-49ab-9949-3ca1088abb78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_0df8c4f4-3c3d-49ab-9949-3ca1088abb78_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_0df8c4f4-3c3d-49ab-9949-3ca1088abb78" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_0df8c4f4-3c3d-49ab-9949-3ca1088abb78_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_16f535f2-d987-4ee1-b9f9-f24c71bc6761" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_0df8c4f4-3c3d-49ab-9949-3ca1088abb78" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_16f535f2-d987-4ee1-b9f9-f24c71bc6761" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_ff9f9052-4b15-494a-a0d5-e984a346592c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_16f535f2-d987-4ee1-b9f9-f24c71bc6761" xlink:to="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_ff9f9052-4b15-494a-a0d5-e984a346592c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_2b0a79d8-6ba2-4215-a5bb-31cf68b91bd5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_ab2b5a03-d737-4077-88b4-a7c66428a491" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_2b0a79d8-6ba2-4215-a5bb-31cf68b91bd5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_2b0a79d8-6ba2-4215-a5bb-31cf68b91bd5_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_2b0a79d8-6ba2-4215-a5bb-31cf68b91bd5" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_2b0a79d8-6ba2-4215-a5bb-31cf68b91bd5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_80c4db35-0f7d-4a94-8100-468f21377497" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_2b0a79d8-6ba2-4215-a5bb-31cf68b91bd5" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_80c4db35-0f7d-4a94-8100-468f21377497" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TwelvemonthExpectedCreditLossesMember_9c43cc68-c915-48de-8226-82290ac6c2b8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TwelvemonthExpectedCreditLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_80c4db35-0f7d-4a94-8100-468f21377497" xlink:to="loc_ifrs-full_TwelvemonthExpectedCreditLossesMember_9c43cc68-c915-48de-8226-82290ac6c2b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LifetimeExpectedCreditLossesMember_5cfa82af-2f3b-45c6-9641-6a95b95236c4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LifetimeExpectedCreditLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_80c4db35-0f7d-4a94-8100-468f21377497" xlink:to="loc_ifrs-full_LifetimeExpectedCreditLossesMember_5cfa82af-2f3b-45c6-9641-6a95b95236c4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis_3f1142ff-165a-4fec-81be-4b7efcbc1635" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_ab2b5a03-d737-4077-88b4-a7c66428a491" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsAxis_3f1142ff-165a-4fec-81be-4b7efcbc1635" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_3f1142ff-165a-4fec-81be-4b7efcbc1635_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_3f1142ff-165a-4fec-81be-4b7efcbc1635" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_3f1142ff-165a-4fec-81be-4b7efcbc1635_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_a651fa80-692d-4b7d-bcb2-8d28a14e5b3e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_3f1142ff-165a-4fec-81be-4b7efcbc1635" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_a651fa80-692d-4b7d-bcb2-8d28a14e5b3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansAndAdvancesToCustomersMember_681500e0-5e28-4f57-b634-f787b32a5402" xlink:href="hsbc-20260630.xsd#hsbc_LoansAndAdvancesToCustomersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_a651fa80-692d-4b7d-bcb2-8d28a14e5b3e" xlink:to="loc_hsbc_LoansAndAdvancesToCustomersMember_681500e0-5e28-4f57-b634-f787b32a5402" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansAndAdvancesToBanksMember_f874ce4f-65b9-4cd1-8474-0554c3403819" xlink:href="hsbc-20260630.xsd#hsbc_LoansAndAdvancesToBanksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_a651fa80-692d-4b7d-bcb2-8d28a14e5b3e" xlink:to="loc_hsbc_LoansAndAdvancesToBanksMember_f874ce4f-65b9-4cd1-8474-0554c3403819" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherFinancialAssetsMember_c3fe837d-87be-4586-b7f4-32e19edbf64f" xlink:href="hsbc-20260630.xsd#hsbc_OtherFinancialAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_a651fa80-692d-4b7d-bcb2-8d28a14e5b3e" xlink:to="loc_hsbc_OtherFinancialAssetsMember_c3fe837d-87be-4586-b7f4-32e19edbf64f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoanAndOtherCreditRelatedCommitmentsMember_46a8c0f7-1f1c-47ca-9b6e-f05f4d178c18" xlink:href="hsbc-20260630.xsd#hsbc_LoanAndOtherCreditRelatedCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_a651fa80-692d-4b7d-bcb2-8d28a14e5b3e" xlink:to="loc_hsbc_LoanAndOtherCreditRelatedCommitmentsMember_46a8c0f7-1f1c-47ca-9b6e-f05f4d178c18" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialGuaranteeContractsMember_86bc3663-ac5a-4524-b925-05c963bd61b1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialGuaranteeContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_a651fa80-692d-4b7d-bcb2-8d28a14e5b3e" xlink:to="loc_ifrs-full_FinancialGuaranteeContractsMember_86bc3663-ac5a-4524-b925-05c963bd61b1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_bd4616d0-3a69-4291-90b2-bc63125dc47e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_ab2b5a03-d737-4077-88b4-a7c66428a491" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_bd4616d0-3a69-4291-90b2-bc63125dc47e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_bd4616d0-3a69-4291-90b2-bc63125dc47e_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_bd4616d0-3a69-4291-90b2-bc63125dc47e" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_bd4616d0-3a69-4291-90b2-bc63125dc47e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_fd76f2fe-b171-4c97-9091-65287d41369c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_bd4616d0-3a69-4291-90b2-bc63125dc47e" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_fd76f2fe-b171-4c97-9091-65287d41369c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsNotCreditimpairedMember_b7cc8ff4-47b6-4d2a-b31a-30e0f685b1ff" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsNotCreditimpairedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_fd76f2fe-b171-4c97-9091-65287d41369c" xlink:to="loc_ifrs-full_FinancialInstrumentsNotCreditimpairedMember_b7cc8ff4-47b6-4d2a-b31a-30e0f685b1ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsCreditimpairedAfterPurchaseOrOriginationMember_700fb9d4-9cd7-4ba8-8dd7-9a12e48246f3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsCreditimpairedAfterPurchaseOrOriginationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_fd76f2fe-b171-4c97-9091-65287d41369c" xlink:to="loc_ifrs-full_FinancialInstrumentsCreditimpairedAfterPurchaseOrOriginationMember_700fb9d4-9cd7-4ba8-8dd7-9a12e48246f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsPurchasedOrOriginatedCreditimpairedMember_fe84ec63-3624-4ad4-97c2-3bb96f6b6408" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsPurchasedOrOriginatedCreditimpairedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_fd76f2fe-b171-4c97-9091-65287d41369c" xlink:to="loc_ifrs-full_FinancialInstrumentsPurchasedOrOriginatedCreditimpairedMember_fe84ec63-3624-4ad4-97c2-3bb96f6b6408" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IndustrySector1Axis_f57fa785-e7eb-41db-b454-00d63e291e5d" xlink:href="hsbc-20260630.xsd#hsbc_IndustrySector1Axis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_ab2b5a03-d737-4077-88b4-a7c66428a491" xlink:to="loc_hsbc_IndustrySector1Axis_f57fa785-e7eb-41db-b454-00d63e291e5d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IndustrySector1Domain_f57fa785-e7eb-41db-b454-00d63e291e5d_default" xlink:href="hsbc-20260630.xsd#hsbc_IndustrySector1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_IndustrySector1Axis_f57fa785-e7eb-41db-b454-00d63e291e5d" xlink:to="loc_hsbc_IndustrySector1Domain_f57fa785-e7eb-41db-b454-00d63e291e5d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IndustrySector1Domain_e52fcc5c-588c-4921-b6fa-a30456ac1145" xlink:href="hsbc-20260630.xsd#hsbc_IndustrySector1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_IndustrySector1Axis_f57fa785-e7eb-41db-b454-00d63e291e5d" xlink:to="loc_hsbc_IndustrySector1Domain_e52fcc5c-588c-4921-b6fa-a30456ac1145" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_PersonalLoansSectorMember_e8517aad-22e9-415e-bff2-de4dc79ca0f7" xlink:href="hsbc-20260630.xsd#hsbc_PersonalLoansSectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IndustrySector1Domain_e52fcc5c-588c-4921-b6fa-a30456ac1145" xlink:to="loc_hsbc_PersonalLoansSectorMember_e8517aad-22e9-415e-bff2-de4dc79ca0f7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CorporateAndCommercialLoansSectorMember_b006f7f9-c86a-49d8-990a-edf8cfe279de" xlink:href="hsbc-20260630.xsd#hsbc_CorporateAndCommercialLoansSectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IndustrySector1Domain_e52fcc5c-588c-4921-b6fa-a30456ac1145" xlink:to="loc_hsbc_CorporateAndCommercialLoansSectorMember_b006f7f9-c86a-49d8-990a-edf8cfe279de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NonBankFinancialInstitutionsLoansSectorMember_44765158-4c62-41b7-ae3e-05190d684c2a" xlink:href="hsbc-20260630.xsd#hsbc_NonBankFinancialInstitutionsLoansSectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IndustrySector1Domain_e52fcc5c-588c-4921-b6fa-a30456ac1145" xlink:to="loc_hsbc_NonBankFinancialInstitutionsLoansSectorMember_44765158-4c62-41b7-ae3e-05190d684c2a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_FinancialLoanSectorMember_be098114-ad74-4af6-af81-64638e1329ad" xlink:href="hsbc-20260630.xsd#hsbc_FinancialLoanSectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IndustrySector1Domain_e52fcc5c-588c-4921-b6fa-a30456ac1145" xlink:to="loc_hsbc_FinancialLoanSectorMember_be098114-ad74-4af6-af81-64638e1329ad" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_52b9037d-5285-46f2-8b94-769c6dac8655" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_ab2b5a03-d737-4077-88b4-a7c66428a491" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_52b9037d-5285-46f2-8b94-769c6dac8655" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_52b9037d-5285-46f2-8b94-769c6dac8655_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_52b9037d-5285-46f2-8b94-769c6dac8655" xlink:to="loc_ifrs-full_CarryingAmountMember_52b9037d-5285-46f2-8b94-769c6dac8655_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_4c855223-9fd9-4331-838a-35779e49024b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_52b9037d-5285-46f2-8b94-769c6dac8655" xlink:to="loc_ifrs-full_CarryingAmountMember_4c855223-9fd9-4331-838a-35779e49024b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_e27a30da-e0bf-49cd-9e9b-f89c6dd88f35" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_4c855223-9fd9-4331-838a-35779e49024b" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_e27a30da-e0bf-49cd-9e9b-f89c6dd88f35" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedImpairmentMember_09523e06-b655-4de4-8f98-b9fb8e8a2579" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedImpairmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_4c855223-9fd9-4331-838a-35779e49024b" xlink:to="loc_ifrs-full_AccumulatedImpairmentMember_09523e06-b655-4de4-8f98-b9fb8e8a2579" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_5412c572-39ce-4203-aa4f-2cbd4971ef11" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_dd760498-568d-499c-9f15-db75308d90c6" xlink:to="loc_ifrs-full_FinancialAssets_5412c572-39ce-4203-aa4f-2cbd4971ef11" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpectedCreditLossRate_423dea2b-df94-47eb-ae2c-16798a5461e5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpectedCreditLossRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_dd760498-568d-499c-9f15-db75308d90c6" xlink:to="loc_ifrs-full_ExpectedCreditLossRate_423dea2b-df94-47eb-ae2c-16798a5461e5" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportStage2dayspastdueanalysisDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportStage2dayspastdueanalysisDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportStage2dayspastdueanalysisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_9d021b3b-0340-41ce-9fdd-49f66b61bc83" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_7b06ac8f-cfe8-47d4-b2c9-675ecd0385b3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_9d021b3b-0340-41ce-9fdd-49f66b61bc83" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_7b06ac8f-cfe8-47d4-b2c9-675ecd0385b3" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_693dc604-8b03-4cf0-9a62-4693d168c2d2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_7b06ac8f-cfe8-47d4-b2c9-675ecd0385b3" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_693dc604-8b03-4cf0-9a62-4693d168c2d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_693dc604-8b03-4cf0-9a62-4693d168c2d2_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_693dc604-8b03-4cf0-9a62-4693d168c2d2" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_693dc604-8b03-4cf0-9a62-4693d168c2d2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_f0d93522-fc21-49a1-9376-e08798fea7e0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_693dc604-8b03-4cf0-9a62-4693d168c2d2" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_f0d93522-fc21-49a1-9376-e08798fea7e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_2fcb74ea-e47c-4583-ba52-c30821ff3c60" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_f0d93522-fc21-49a1-9376-e08798fea7e0" xlink:to="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_2fcb74ea-e47c-4583-ba52-c30821ff3c60" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_cd4ce111-e18b-4767-a326-45e75abcfb7f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_7b06ac8f-cfe8-47d4-b2c9-675ecd0385b3" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_cd4ce111-e18b-4767-a326-45e75abcfb7f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_cd4ce111-e18b-4767-a326-45e75abcfb7f_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_cd4ce111-e18b-4767-a326-45e75abcfb7f" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_cd4ce111-e18b-4767-a326-45e75abcfb7f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_5f604099-65ab-4ffe-a005-12d481d8d510" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_cd4ce111-e18b-4767-a326-45e75abcfb7f" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_5f604099-65ab-4ffe-a005-12d481d8d510" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LifetimeExpectedCreditLossesMember_9412416c-d66f-422e-a0bf-b9ea1c282fb8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LifetimeExpectedCreditLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_5f604099-65ab-4ffe-a005-12d481d8d510" xlink:to="loc_ifrs-full_LifetimeExpectedCreditLossesMember_9412416c-d66f-422e-a0bf-b9ea1c282fb8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis_2cad85eb-8c91-47e4-95a6-b6c466d0b180" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_7b06ac8f-cfe8-47d4-b2c9-675ecd0385b3" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsAxis_2cad85eb-8c91-47e4-95a6-b6c466d0b180" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_2cad85eb-8c91-47e4-95a6-b6c466d0b180_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_2cad85eb-8c91-47e4-95a6-b6c466d0b180" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_2cad85eb-8c91-47e4-95a6-b6c466d0b180_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_c74d74a7-1d21-447a-bce5-b8629143b6f3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_2cad85eb-8c91-47e4-95a6-b6c466d0b180" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_c74d74a7-1d21-447a-bce5-b8629143b6f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansAndAdvancesToCustomersMember_076259d0-e48d-4ccb-aff8-d83a346d2b0f" xlink:href="hsbc-20260630.xsd#hsbc_LoansAndAdvancesToCustomersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_c74d74a7-1d21-447a-bce5-b8629143b6f3" xlink:to="loc_hsbc_LoansAndAdvancesToCustomersMember_076259d0-e48d-4ccb-aff8-d83a346d2b0f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansAndAdvancesToBanksMember_b0c5120a-929c-4758-99c5-c81fb3c0c15b" xlink:href="hsbc-20260630.xsd#hsbc_LoansAndAdvancesToBanksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_c74d74a7-1d21-447a-bce5-b8629143b6f3" xlink:to="loc_hsbc_LoansAndAdvancesToBanksMember_b0c5120a-929c-4758-99c5-c81fb3c0c15b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherFinancialAssetsMember_c6146e9b-68e2-477a-a9ef-7865990d70cd" xlink:href="hsbc-20260630.xsd#hsbc_OtherFinancialAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_c74d74a7-1d21-447a-bce5-b8629143b6f3" xlink:to="loc_hsbc_OtherFinancialAssetsMember_c6146e9b-68e2-477a-a9ef-7865990d70cd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_d8a24537-9429-4fec-a462-6689cc9fdf4c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_7b06ac8f-cfe8-47d4-b2c9-675ecd0385b3" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_d8a24537-9429-4fec-a462-6689cc9fdf4c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_d8a24537-9429-4fec-a462-6689cc9fdf4c_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_d8a24537-9429-4fec-a462-6689cc9fdf4c" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_d8a24537-9429-4fec-a462-6689cc9fdf4c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_4e001ec4-1ee0-4bbc-a959-b6dccd2c0053" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_d8a24537-9429-4fec-a462-6689cc9fdf4c" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_4e001ec4-1ee0-4bbc-a959-b6dccd2c0053" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsNotCreditimpairedMember_1a37d87a-ddc8-464c-adaf-d9614ed3e354" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsNotCreditimpairedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_4e001ec4-1ee0-4bbc-a959-b6dccd2c0053" xlink:to="loc_ifrs-full_FinancialInstrumentsNotCreditimpairedMember_1a37d87a-ddc8-464c-adaf-d9614ed3e354" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IndustrySector1Axis_0d62de18-da51-4728-88aa-345903603d09" xlink:href="hsbc-20260630.xsd#hsbc_IndustrySector1Axis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_7b06ac8f-cfe8-47d4-b2c9-675ecd0385b3" xlink:to="loc_hsbc_IndustrySector1Axis_0d62de18-da51-4728-88aa-345903603d09" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IndustrySector1Domain_0d62de18-da51-4728-88aa-345903603d09_default" xlink:href="hsbc-20260630.xsd#hsbc_IndustrySector1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_IndustrySector1Axis_0d62de18-da51-4728-88aa-345903603d09" xlink:to="loc_hsbc_IndustrySector1Domain_0d62de18-da51-4728-88aa-345903603d09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IndustrySector1Domain_71e1b61b-adf7-4c95-bd13-f576ad78b049" xlink:href="hsbc-20260630.xsd#hsbc_IndustrySector1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_IndustrySector1Axis_0d62de18-da51-4728-88aa-345903603d09" xlink:to="loc_hsbc_IndustrySector1Domain_71e1b61b-adf7-4c95-bd13-f576ad78b049" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_PersonalLoansSectorMember_76330fbb-2aa4-4f3e-a9ec-b5003d1613bb" xlink:href="hsbc-20260630.xsd#hsbc_PersonalLoansSectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IndustrySector1Domain_71e1b61b-adf7-4c95-bd13-f576ad78b049" xlink:to="loc_hsbc_PersonalLoansSectorMember_76330fbb-2aa4-4f3e-a9ec-b5003d1613bb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CorporateAndCommercialLoansSectorMember_f3ab9119-0289-4777-8db4-38e4c06cb044" xlink:href="hsbc-20260630.xsd#hsbc_CorporateAndCommercialLoansSectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IndustrySector1Domain_71e1b61b-adf7-4c95-bd13-f576ad78b049" xlink:to="loc_hsbc_CorporateAndCommercialLoansSectorMember_f3ab9119-0289-4777-8db4-38e4c06cb044" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NonBankFinancialInstitutionsLoansSectorMember_aeb3ab13-2f81-46cf-828f-32058df3fc7a" xlink:href="hsbc-20260630.xsd#hsbc_NonBankFinancialInstitutionsLoansSectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IndustrySector1Domain_71e1b61b-adf7-4c95-bd13-f576ad78b049" xlink:to="loc_hsbc_NonBankFinancialInstitutionsLoansSectorMember_aeb3ab13-2f81-46cf-828f-32058df3fc7a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01c9145a-2834-48df-834a-0df22ecd4a72" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_7b06ac8f-cfe8-47d4-b2c9-675ecd0385b3" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01c9145a-2834-48df-834a-0df22ecd4a72" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_01c9145a-2834-48df-834a-0df22ecd4a72_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01c9145a-2834-48df-834a-0df22ecd4a72" xlink:to="loc_ifrs-full_CarryingAmountMember_01c9145a-2834-48df-834a-0df22ecd4a72_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_a1882e08-9a17-482b-befa-63015ed20225" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_01c9145a-2834-48df-834a-0df22ecd4a72" xlink:to="loc_ifrs-full_CarryingAmountMember_a1882e08-9a17-482b-befa-63015ed20225" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_e41dd133-64cf-45f4-8247-676f721a4f4a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_a1882e08-9a17-482b-befa-63015ed20225" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_e41dd133-64cf-45f4-8247-676f721a4f4a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedImpairmentMember_a2375a8d-73e6-4623-9530-4e0f138f587e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedImpairmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_a1882e08-9a17-482b-befa-63015ed20225" xlink:to="loc_ifrs-full_AccumulatedImpairmentMember_a2375a8d-73e6-4623-9530-4e0f138f587e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PastDueStatusAxis_be3c1b79-635c-4471-92c5-196f60e5043a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PastDueStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_7b06ac8f-cfe8-47d4-b2c9-675ecd0385b3" xlink:to="loc_ifrs-full_PastDueStatusAxis_be3c1b79-635c-4471-92c5-196f60e5043a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PastDueStatusDomain_be3c1b79-635c-4471-92c5-196f60e5043a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PastDueStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_PastDueStatusAxis_be3c1b79-635c-4471-92c5-196f60e5043a" xlink:to="loc_ifrs-full_PastDueStatusDomain_be3c1b79-635c-4471-92c5-196f60e5043a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PastDueStatusDomain_8c77668f-acb8-4038-bf1d-b24b23d4e517" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PastDueStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_PastDueStatusAxis_be3c1b79-635c-4471-92c5-196f60e5043a" xlink:to="loc_ifrs-full_PastDueStatusDomain_8c77668f-acb8-4038-bf1d-b24b23d4e517" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentMember_5b67eb02-9f86-466c-baa7-4770f3c8d424" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PastDueStatusDomain_8c77668f-acb8-4038-bf1d-b24b23d4e517" xlink:to="loc_ifrs-full_CurrentMember_5b67eb02-9f86-466c-baa7-4770f3c8d424" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OneToTwentyNineDaysPastDueMember_5f59dd4e-eceb-434c-82f3-d008eceaddc2" xlink:href="hsbc-20260630.xsd#hsbc_OneToTwentyNineDaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PastDueStatusDomain_8c77668f-acb8-4038-bf1d-b24b23d4e517" xlink:to="loc_hsbc_OneToTwentyNineDaysPastDueMember_5f59dd4e-eceb-434c-82f3-d008eceaddc2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ThirtyDaysOrGreaterThanThirtyDaysPastDueMember_584cbaaf-403b-4c9c-a12a-4d166cc9bf95" xlink:href="hsbc-20260630.xsd#hsbc_ThirtyDaysOrGreaterThanThirtyDaysPastDueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_PastDueStatusDomain_8c77668f-acb8-4038-bf1d-b24b23d4e517" xlink:to="loc_hsbc_ThirtyDaysOrGreaterThanThirtyDaysPastDueMember_584cbaaf-403b-4c9c-a12a-4d166cc9bf95" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_6e9e63e2-38bc-4e5e-b3f6-2c963d367c3f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_9d021b3b-0340-41ce-9fdd-49f66b61bc83" xlink:to="loc_ifrs-full_FinancialAssets_6e9e63e2-38bc-4e5e-b3f6-2c963d367c3f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ExpectedCreditLossRate_d2f6a66d-154f-47b7-b140-e70a5205310d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ExpectedCreditLossRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_9d021b3b-0340-41ce-9fdd-49f66b61bc83" xlink:to="loc_ifrs-full_ExpectedCreditLossRate_d2f6a66d-154f-47b7-b140-e70a5205310d" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportMeasurementuncertaintyandsensitivityanalysisofECLestimatesDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportMeasurementuncertaintyandsensitivityanalysisofECLestimatesDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportMeasurementuncertaintyandsensitivityanalysisofECLestimatesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_b293525c-119a-4964-ad76-e44a4d7691b0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_e1bd143c-dade-4385-a71d-5361fdb79829" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_b293525c-119a-4964-ad76-e44a4d7691b0" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_e1bd143c-dade-4385-a71d-5361fdb79829" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioAxis_cc65c03c-9b50-416a-ab9f-9973447e3f23" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_e1bd143c-dade-4385-a71d-5361fdb79829" xlink:to="loc_hsbc_ECLEconomicScenarioAxis_cc65c03c-9b50-416a-ab9f-9973447e3f23" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_cc65c03c-9b50-416a-ab9f-9973447e3f23_default" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_cc65c03c-9b50-416a-ab9f-9973447e3f23" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_cc65c03c-9b50-416a-ab9f-9973447e3f23_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_e98dc277-1ecc-45d2-8528-5e3d1c39413e" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_cc65c03c-9b50-416a-ab9f-9973447e3f23" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_e98dc277-1ecc-45d2-8528-5e3d1c39413e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_UpsideScenarioMember_a8e8e809-bd2d-4f85-8265-28623e2aea6e" xlink:href="hsbc-20260630.xsd#hsbc_UpsideScenarioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_e98dc277-1ecc-45d2-8528-5e3d1c39413e" xlink:to="loc_hsbc_UpsideScenarioMember_a8e8e809-bd2d-4f85-8265-28623e2aea6e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CentralScenarioMember_38940416-7e8c-4113-8e75-dc1cabe75779" xlink:href="hsbc-20260630.xsd#hsbc_CentralScenarioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_e98dc277-1ecc-45d2-8528-5e3d1c39413e" xlink:to="loc_hsbc_CentralScenarioMember_38940416-7e8c-4113-8e75-dc1cabe75779" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DownsideTwoScenarioMember_019f46ed-f83b-77bf-a047-973e32971ecd" xlink:href="hsbc-20260630.xsd#hsbc_DownsideTwoScenarioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_e98dc277-1ecc-45d2-8528-5e3d1c39413e" xlink:to="loc_hsbc_DownsideTwoScenarioMember_019f46ed-f83b-77bf-a047-973e32971ecd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_TotalNumberOfEconomicScenariosToCalculateECL_485f9a5f-78b0-4106-b3b6-c2d7afa71cbe" xlink:href="hsbc-20260630.xsd#hsbc_TotalNumberOfEconomicScenariosToCalculateECL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_b293525c-119a-4964-ad76-e44a4d7691b0" xlink:to="loc_hsbc_TotalNumberOfEconomicScenariosToCalculateECL_485f9a5f-78b0-4106-b3b6-c2d7afa71cbe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NumberOfEconomicScenariosDrawnFromConsensusForecastsAndDistributionalEstimates_185d5bc6-cbde-46a8-9a06-3ac6b1bd8a21" xlink:href="hsbc-20260630.xsd#hsbc_NumberOfEconomicScenariosDrawnFromConsensusForecastsAndDistributionalEstimates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_b293525c-119a-4964-ad76-e44a4d7691b0" xlink:to="loc_hsbc_NumberOfEconomicScenariosDrawnFromConsensusForecastsAndDistributionalEstimates_185d5bc6-cbde-46a8-9a06-3ac6b1bd8a21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesProbability_277e89f9-2df9-440c-a68f-3d91aa493cdd" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesProbability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_b293525c-119a-4964-ad76-e44a4d7691b0" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesProbability_277e89f9-2df9-440c-a68f-3d91aa493cdd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRateOneYearAverage_8826b0d0-2d89-437b-b342-6d2df2227102" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRateOneYearAverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_b293525c-119a-4964-ad76-e44a4d7691b0" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRateOneYearAverage_8826b0d0-2d89-437b-b342-6d2df2227102" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRateFiveYearAverage_62407263-f47e-4aef-aa6f-41e706952177" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRateFiveYearAverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_b293525c-119a-4964-ad76-e44a4d7691b0" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRateFiveYearAverage_62407263-f47e-4aef-aa6f-41e706952177" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AverageSalesPrices_b764c085-5ba8-41a8-bc3c-d4f31b132735" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_AverageSalesPrices"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_b293525c-119a-4964-ad76-e44a4d7691b0" xlink:to="loc_srt_AverageSalesPrices_b764c085-5ba8-41a8-bc3c-d4f31b132735" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportTheconsensusCentralscenarioDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportTheconsensusCentralscenarioDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportTheconsensusCentralscenarioDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_342a3df0-35c2-4fbe-a7fb-7c30bb628f56" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_039f84a7-635c-4a07-bab7-73a174132f81" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_342a3df0-35c2-4fbe-a7fb-7c30bb628f56" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_039f84a7-635c-4a07-bab7-73a174132f81" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioAxis_9371cda4-1d5f-4062-848c-0b421d2c9f37" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_039f84a7-635c-4a07-bab7-73a174132f81" xlink:to="loc_hsbc_ECLEconomicScenarioAxis_9371cda4-1d5f-4062-848c-0b421d2c9f37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_9371cda4-1d5f-4062-848c-0b421d2c9f37_default" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_9371cda4-1d5f-4062-848c-0b421d2c9f37" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_9371cda4-1d5f-4062-848c-0b421d2c9f37_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_8b1fe9e0-e337-4a38-929e-381b7b7159d5" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_9371cda4-1d5f-4062-848c-0b421d2c9f37" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_8b1fe9e0-e337-4a38-929e-381b7b7159d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CentralScenarioMember_5a27f79b-85f8-4f47-905e-2748257d08a6" xlink:href="hsbc-20260630.xsd#hsbc_CentralScenarioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_8b1fe9e0-e337-4a38-929e-381b7b7159d5" xlink:to="loc_hsbc_CentralScenarioMember_5a27f79b-85f8-4f47-905e-2748257d08a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityAxis_d37dc6ea-bcaf-4034-a36e-48d2cf2fd46d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_039f84a7-635c-4a07-bab7-73a174132f81" xlink:to="loc_ifrs-full_MaturityAxis_d37dc6ea-bcaf-4034-a36e-48d2cf2fd46d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain_d37dc6ea-bcaf-4034-a36e-48d2cf2fd46d_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_d37dc6ea-bcaf-4034-a36e-48d2cf2fd46d" xlink:to="loc_ifrs-full_MaturityDomain_d37dc6ea-bcaf-4034-a36e-48d2cf2fd46d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain_28bbdbdf-25ef-4ee6-a6dc-ca832ae19bf7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_d37dc6ea-bcaf-4034-a36e-48d2cf2fd46d" xlink:to="loc_ifrs-full_MaturityDomain_28bbdbdf-25ef-4ee6-a6dc-ca832ae19bf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember_e2ea3799-61f0-4441-942f-53d37c0530df" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotLaterThanOneYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_28bbdbdf-25ef-4ee6-a6dc-ca832ae19bf7" xlink:to="loc_ifrs-full_NotLaterThanOneYearMember_e2ea3799-61f0-4441-942f-53d37c0530df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_eb8b8b8c-cc8c-44c1-bbbb-ce339ecddfe5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_28bbdbdf-25ef-4ee6-a6dc-ca832ae19bf7" xlink:to="loc_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_eb8b8b8c-cc8c-44c1-bbbb-ce339ecddfe5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_84b32a81-0f95-4f0e-bb2b-7985af817f20" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_28bbdbdf-25ef-4ee6-a6dc-ca832ae19bf7" xlink:to="loc_ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember_84b32a81-0f95-4f0e-bb2b-7985af817f20" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_c86cb336-c40a-49c3-8424-4b7873c6b744" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_28bbdbdf-25ef-4ee6-a6dc-ca832ae19bf7" xlink:to="loc_ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember_c86cb336-c40a-49c3-8424-4b7873c6b744" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_c2fdd460-42d9-49e7-8935-21f68680fdd3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_28bbdbdf-25ef-4ee6-a6dc-ca832ae19bf7" xlink:to="loc_ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember_c2fdd460-42d9-49e7-8935-21f68680fdd3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_9078447b-7eef-47c4-80fe-1c42c9388e22" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_039f84a7-635c-4a07-bab7-73a174132f81" xlink:to="loc_srt_StatementGeographicalAxis_9078447b-7eef-47c4-80fe-1c42c9388e22" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_9078447b-7eef-47c4-80fe-1c42c9388e22_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_9078447b-7eef-47c4-80fe-1c42c9388e22" xlink:to="loc_srt_SegmentGeographicalDomain_9078447b-7eef-47c4-80fe-1c42c9388e22_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_d855f521-65c6-4978-9eb2-957a35e7b702" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_9078447b-7eef-47c4-80fe-1c42c9388e22" xlink:to="loc_srt_SegmentGeographicalDomain_d855f521-65c6-4978-9eb2-957a35e7b702" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_ae2cf50d-019a-49f3-84d0-257442436ec7" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d855f521-65c6-4978-9eb2-957a35e7b702" xlink:to="loc_country_GB_ae2cf50d-019a-49f3-84d0-257442436ec7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_36b590d2-12a7-4ef7-a25e-ed2c092b2dba" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d855f521-65c6-4978-9eb2-957a35e7b702" xlink:to="loc_country_US_36b590d2-12a7-4ef7-a25e-ed2c092b2dba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_HK_c83d239c-3cc0-419c-b087-36f061c290d7" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_HK"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d855f521-65c6-4978-9eb2-957a35e7b702" xlink:to="loc_country_HK_c83d239c-3cc0-419c-b087-36f061c290d7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_abd055f0-4843-4731-a61a-385192723cd8" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d855f521-65c6-4978-9eb2-957a35e7b702" xlink:to="loc_country_CN_abd055f0-4843-4731-a61a-385192723cd8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_adea52ed-60a1-4b81-a19e-615395c5cefa" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CA"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d855f521-65c6-4978-9eb2-957a35e7b702" xlink:to="loc_country_CA_adea52ed-60a1-4b81-a19e-615395c5cefa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_FR_75649777-5031-43b5-93d4-cc4ae10e867e" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_FR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d855f521-65c6-4978-9eb2-957a35e7b702" xlink:to="loc_country_FR_75649777-5031-43b5-93d4-cc4ae10e867e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_AE_3070dae2-04da-460e-92cc-a82cc7ea73c9" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_AE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d855f521-65c6-4978-9eb2-957a35e7b702" xlink:to="loc_country_AE_3070dae2-04da-460e-92cc-a82cc7ea73c9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MX_4ba264e0-18dc-4fc4-a31c-98f50dddc579" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_MX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d855f521-65c6-4978-9eb2-957a35e7b702" xlink:to="loc_country_MX_4ba264e0-18dc-4fc4-a31c-98f50dddc579" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRate_e24c5e56-e8b8-4a8a-bbd9-06cdb67d29f4" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_342a3df0-35c2-4fbe-a7fb-7c30bb628f56" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRate_e24c5e56-e8b8-4a8a-bbd9-06cdb67d29f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRateFiveYearAverage_4636d3f7-47f1-416e-a8b5-73d09827861c" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRateFiveYearAverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_342a3df0-35c2-4fbe-a7fb-7c30bb628f56" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRateFiveYearAverage_4636d3f7-47f1-416e-a8b5-73d09827861c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesUnemploymentRate_3af371e2-ef1c-4292-bf4b-69435dbd100d" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesUnemploymentRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_342a3df0-35c2-4fbe-a7fb-7c30bb628f56" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesUnemploymentRate_3af371e2-ef1c-4292-bf4b-69435dbd100d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesUnemploymentRateFiveYearAverage_02b05e18-7393-4836-ad3b-8cc896a2cb85" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesUnemploymentRateFiveYearAverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_342a3df0-35c2-4fbe-a7fb-7c30bb628f56" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesUnemploymentRateFiveYearAverage_02b05e18-7393-4836-ad3b-8cc896a2cb85" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesHousePriceGrowth_29b494b6-99ef-47e0-999b-821a4cff1b92" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesHousePriceGrowth"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_342a3df0-35c2-4fbe-a7fb-7c30bb628f56" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesHousePriceGrowth_29b494b6-99ef-47e0-999b-821a4cff1b92" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesHousePriceGrowthFiveYearAverage_c3d9d841-3bca-44f6-b709-d60c40294674" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesHousePriceGrowthFiveYearAverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_342a3df0-35c2-4fbe-a7fb-7c30bb628f56" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesHousePriceGrowthFiveYearAverage_c3d9d841-3bca-44f6-b709-d60c40294674" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesInflationRate_69a64482-53c7-43a5-9338-6a8e27ceb7de" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesInflationRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_342a3df0-35c2-4fbe-a7fb-7c30bb628f56" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesInflationRate_69a64482-53c7-43a5-9338-6a8e27ceb7de" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesInflationRateFiveYearAverage_3972104d-dee0-4b07-a605-7f6d1b1ff5b2" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesInflationRateFiveYearAverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_342a3df0-35c2-4fbe-a7fb-7c30bb628f56" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesInflationRateFiveYearAverage_3972104d-dee0-4b07-a605-7f6d1b1ff5b2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesCentralBankPolicyRate_6aa51f36-25c1-4388-a9ac-e513dd87424e" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesCentralBankPolicyRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_342a3df0-35c2-4fbe-a7fb-7c30bb628f56" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesCentralBankPolicyRate_6aa51f36-25c1-4388-a9ac-e513dd87424e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesCentralBankPolicyRateFiveYearAverage_cb05136d-fbd8-43c7-b3a4-bd226e5c070d" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesCentralBankPolicyRateFiveYearAverage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_342a3df0-35c2-4fbe-a7fb-7c30bb628f56" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesCentralBankPolicyRateFiveYearAverage_cb05136d-fbd8-43c7-b3a4-bd226e5c070d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesForecastPeriod_0852b4a4-0d97-40d1-bf72-c6f5fd5c0a92" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesForecastPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_342a3df0-35c2-4fbe-a7fb-7c30bb628f56" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesForecastPeriod_0852b4a4-0d97-40d1-bf72-c6f5fd5c0a92" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportTheconsensusUpsidescenarioDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportTheconsensusUpsidescenarioDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportTheconsensusUpsidescenarioDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_9e225082-9a37-4d08-91b1-314bf93a50f3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_8316da5a-a5fd-41ce-9ccc-36c9bd0698ad" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_9e225082-9a37-4d08-91b1-314bf93a50f3" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_8316da5a-a5fd-41ce-9ccc-36c9bd0698ad" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioAxis_ae715c6c-ca3d-43de-833c-37cf68387c98" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_8316da5a-a5fd-41ce-9ccc-36c9bd0698ad" xlink:to="loc_hsbc_ECLEconomicScenarioAxis_ae715c6c-ca3d-43de-833c-37cf68387c98" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_ae715c6c-ca3d-43de-833c-37cf68387c98_default" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_ae715c6c-ca3d-43de-833c-37cf68387c98" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_ae715c6c-ca3d-43de-833c-37cf68387c98_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_9c8ebbab-3421-40eb-b83f-184d1354e6fa" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_ae715c6c-ca3d-43de-833c-37cf68387c98" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_9c8ebbab-3421-40eb-b83f-184d1354e6fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_UpsideScenarioMember_36f4eb14-8415-472c-b370-41769efc01b8" xlink:href="hsbc-20260630.xsd#hsbc_UpsideScenarioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_9c8ebbab-3421-40eb-b83f-184d1354e6fa" xlink:to="loc_hsbc_UpsideScenarioMember_36f4eb14-8415-472c-b370-41769efc01b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_80ecc4db-4269-4aee-acd4-111df952808f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_8316da5a-a5fd-41ce-9ccc-36c9bd0698ad" xlink:to="loc_srt_StatementGeographicalAxis_80ecc4db-4269-4aee-acd4-111df952808f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_80ecc4db-4269-4aee-acd4-111df952808f_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_80ecc4db-4269-4aee-acd4-111df952808f" xlink:to="loc_srt_SegmentGeographicalDomain_80ecc4db-4269-4aee-acd4-111df952808f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_e6847806-b5fd-4f92-b192-7813d384fd42" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_80ecc4db-4269-4aee-acd4-111df952808f" xlink:to="loc_srt_SegmentGeographicalDomain_e6847806-b5fd-4f92-b192-7813d384fd42" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_ef32b8dd-8661-4d5b-baca-fd6147e90b79" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e6847806-b5fd-4f92-b192-7813d384fd42" xlink:to="loc_country_GB_ef32b8dd-8661-4d5b-baca-fd6147e90b79" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_7688c929-fed8-4c72-9366-49265ac786ba" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e6847806-b5fd-4f92-b192-7813d384fd42" xlink:to="loc_country_US_7688c929-fed8-4c72-9366-49265ac786ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_HK_c5d76f43-6c2e-4335-90ae-f1ae420aaca5" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_HK"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e6847806-b5fd-4f92-b192-7813d384fd42" xlink:to="loc_country_HK_c5d76f43-6c2e-4335-90ae-f1ae420aaca5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_03e49a3c-29b0-4773-943e-54143c75bc4b" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e6847806-b5fd-4f92-b192-7813d384fd42" xlink:to="loc_country_CN_03e49a3c-29b0-4773-943e-54143c75bc4b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_FR_f5f7b7ab-e3eb-4b37-abcd-dc3691043ae7" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_FR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e6847806-b5fd-4f92-b192-7813d384fd42" xlink:to="loc_country_FR_f5f7b7ab-e3eb-4b37-abcd-dc3691043ae7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_AE_adb4b378-776a-4443-a1cb-93ca2d2fb2c1" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_AE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e6847806-b5fd-4f92-b192-7813d384fd42" xlink:to="loc_country_AE_adb4b378-776a-4443-a1cb-93ca2d2fb2c1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MX_44d19f7e-4042-4452-a03b-cc448dd69da2" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_MX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_e6847806-b5fd-4f92-b192-7813d384fd42" xlink:to="loc_country_MX_44d19f7e-4042-4452-a03b-cc448dd69da2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityAxis_5e000315-6c4f-480e-8f4e-a5f348ade6ac" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_8316da5a-a5fd-41ce-9ccc-36c9bd0698ad" xlink:to="loc_ifrs-full_MaturityAxis_5e000315-6c4f-480e-8f4e-a5f348ade6ac" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain_5e000315-6c4f-480e-8f4e-a5f348ade6ac_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_5e000315-6c4f-480e-8f4e-a5f348ade6ac" xlink:to="loc_ifrs-full_MaturityDomain_5e000315-6c4f-480e-8f4e-a5f348ade6ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain_1bebc2fa-f558-45b3-9a79-d2bfda534ae6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_5e000315-6c4f-480e-8f4e-a5f348ade6ac" xlink:to="loc_ifrs-full_MaturityDomain_1bebc2fa-f558-45b3-9a79-d2bfda534ae6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember_3f6a6725-059f-4ecb-ab77-13ddb7547d7e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotLaterThanOneYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_1bebc2fa-f558-45b3-9a79-d2bfda534ae6" xlink:to="loc_ifrs-full_NotLaterThanOneYearMember_3f6a6725-059f-4ecb-ab77-13ddb7547d7e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_1dca33fa-d254-467a-96a0-ef231bdd8e7f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_1bebc2fa-f558-45b3-9a79-d2bfda534ae6" xlink:to="loc_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_1dca33fa-d254-467a-96a0-ef231bdd8e7f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRate_51c1124e-7f26-498a-98b2-e736c207a06c" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_9e225082-9a37-4d08-91b1-314bf93a50f3" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRate_51c1124e-7f26-498a-98b2-e736c207a06c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesUnemploymentRate_f89a6d99-3a66-4d21-943b-3ef5cfbc9a8e" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesUnemploymentRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_9e225082-9a37-4d08-91b1-314bf93a50f3" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesUnemploymentRate_f89a6d99-3a66-4d21-943b-3ef5cfbc9a8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesHousePriceGrowth_8ccfdff8-ebf1-4166-a364-726c2d281c6b" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesHousePriceGrowth"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_9e225082-9a37-4d08-91b1-314bf93a50f3" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesHousePriceGrowth_8ccfdff8-ebf1-4166-a364-726c2d281c6b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesInflationRate_035b2897-9484-44f2-b73b-6731e56b21cd" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesInflationRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_9e225082-9a37-4d08-91b1-314bf93a50f3" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesInflationRate_035b2897-9484-44f2-b73b-6731e56b21cd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesCentralBankPolicyRate_9d20a926-f3ba-499b-ae0a-b6c95be0003f" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesCentralBankPolicyRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_9e225082-9a37-4d08-91b1-314bf93a50f3" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesCentralBankPolicyRate_9d20a926-f3ba-499b-ae0a-b6c95be0003f" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportTheDownsidescenariosDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportTheDownsidescenariosDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportTheDownsidescenariosDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_4e642d38-f809-41d3-99b6-0ede5f92b735" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_ae9f968d-eee0-43ab-868d-42b6b110244b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_4e642d38-f809-41d3-99b6-0ede5f92b735" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_ae9f968d-eee0-43ab-868d-42b6b110244b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioAxis_267457a7-347e-4334-96c3-61db8d4fb7d6" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_ae9f968d-eee0-43ab-868d-42b6b110244b" xlink:to="loc_hsbc_ECLEconomicScenarioAxis_267457a7-347e-4334-96c3-61db8d4fb7d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_267457a7-347e-4334-96c3-61db8d4fb7d6_default" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_267457a7-347e-4334-96c3-61db8d4fb7d6" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_267457a7-347e-4334-96c3-61db8d4fb7d6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_5e56ca6c-0012-4c04-a0b3-f0442d85715f" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_267457a7-347e-4334-96c3-61db8d4fb7d6" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_5e56ca6c-0012-4c04-a0b3-f0442d85715f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DownsideScenarioWorstOutcomeMember_d039800a-55d0-442c-ba6c-ba0aec4e094b" xlink:href="hsbc-20260630.xsd#hsbc_DownsideScenarioWorstOutcomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_5e56ca6c-0012-4c04-a0b3-f0442d85715f" xlink:to="loc_hsbc_DownsideScenarioWorstOutcomeMember_d039800a-55d0-442c-ba6c-ba0aec4e094b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DownsideScenarioAdditionalMember_f88d8f7d-37c3-475b-b22c-8f17a9b9ca0a" xlink:href="hsbc-20260630.xsd#hsbc_DownsideScenarioAdditionalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_5e56ca6c-0012-4c04-a0b3-f0442d85715f" xlink:to="loc_hsbc_DownsideScenarioAdditionalMember_f88d8f7d-37c3-475b-b22c-8f17a9b9ca0a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_aa5c6d2a-04bd-481e-b2e5-b8ad9915bce4" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_ae9f968d-eee0-43ab-868d-42b6b110244b" xlink:to="loc_srt_StatementGeographicalAxis_aa5c6d2a-04bd-481e-b2e5-b8ad9915bce4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_aa5c6d2a-04bd-481e-b2e5-b8ad9915bce4_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_aa5c6d2a-04bd-481e-b2e5-b8ad9915bce4" xlink:to="loc_srt_SegmentGeographicalDomain_aa5c6d2a-04bd-481e-b2e5-b8ad9915bce4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_3f8a4ed3-a733-4297-bfb5-68d92837393d" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_aa5c6d2a-04bd-481e-b2e5-b8ad9915bce4" xlink:to="loc_srt_SegmentGeographicalDomain_3f8a4ed3-a733-4297-bfb5-68d92837393d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_acb41276-8301-4ba8-800e-837d5c53ce0b" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_3f8a4ed3-a733-4297-bfb5-68d92837393d" xlink:to="loc_country_GB_acb41276-8301-4ba8-800e-837d5c53ce0b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_de014ed3-f697-4af3-a78d-f524cacca466" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_3f8a4ed3-a733-4297-bfb5-68d92837393d" xlink:to="loc_country_US_de014ed3-f697-4af3-a78d-f524cacca466" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_HK_4828b522-14f7-4412-a128-402b4d381369" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_HK"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_3f8a4ed3-a733-4297-bfb5-68d92837393d" xlink:to="loc_country_HK_4828b522-14f7-4412-a128-402b4d381369" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_3429ac1c-ff0a-409b-8121-7a06a750f366" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_3f8a4ed3-a733-4297-bfb5-68d92837393d" xlink:to="loc_country_CN_3429ac1c-ff0a-409b-8121-7a06a750f366" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_FR_c3ba4170-7117-4d5e-9aeb-ceac6bdd1838" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_FR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_3f8a4ed3-a733-4297-bfb5-68d92837393d" xlink:to="loc_country_FR_c3ba4170-7117-4d5e-9aeb-ceac6bdd1838" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_AE_718c7150-0d59-4a51-8828-6d7c85c32970" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_AE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_3f8a4ed3-a733-4297-bfb5-68d92837393d" xlink:to="loc_country_AE_718c7150-0d59-4a51-8828-6d7c85c32970" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MX_13fc7c2d-f8aa-41a5-80eb-4b24aca88ca7" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_MX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_3f8a4ed3-a733-4297-bfb5-68d92837393d" xlink:to="loc_country_MX_13fc7c2d-f8aa-41a5-80eb-4b24aca88ca7" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityAxis_ae8f406e-bd9d-4f97-bf86-20d57eb8c036" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_ae9f968d-eee0-43ab-868d-42b6b110244b" xlink:to="loc_ifrs-full_MaturityAxis_ae8f406e-bd9d-4f97-bf86-20d57eb8c036" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain_ae8f406e-bd9d-4f97-bf86-20d57eb8c036_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_MaturityAxis_ae8f406e-bd9d-4f97-bf86-20d57eb8c036" xlink:to="loc_ifrs-full_MaturityDomain_ae8f406e-bd9d-4f97-bf86-20d57eb8c036_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaturityDomain_cb346a69-c635-4a17-af27-d234058963b5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaturityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_MaturityAxis_ae8f406e-bd9d-4f97-bf86-20d57eb8c036" xlink:to="loc_ifrs-full_MaturityDomain_cb346a69-c635-4a17-af27-d234058963b5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotLaterThanOneYearMember_86e95287-e5c2-490a-9b8f-d8f39b6b0f4d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NotLaterThanOneYearMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_cb346a69-c635-4a17-af27-d234058963b5" xlink:to="loc_ifrs-full_NotLaterThanOneYearMember_86e95287-e5c2-490a-9b8f-d8f39b6b0f4d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_a4d3fa98-d8b1-49b0-a313-3a24d4b63646" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_MaturityDomain_cb346a69-c635-4a17-af27-d234058963b5" xlink:to="loc_ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember_a4d3fa98-d8b1-49b0-a313-3a24d4b63646" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRate_ab25c621-5c7d-4312-8a99-99e1d09dad2a" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_4e642d38-f809-41d3-99b6-0ede5f92b735" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesGDPGrowthRate_ab25c621-5c7d-4312-8a99-99e1d09dad2a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesUnemploymentRate_bdcc627c-4516-4f36-af5c-bbcf568425ee" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesUnemploymentRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_4e642d38-f809-41d3-99b6-0ede5f92b735" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesUnemploymentRate_bdcc627c-4516-4f36-af5c-bbcf568425ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesHousePriceGrowth_a27166fc-7f1c-48ec-ad2f-9a4af820e8a2" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesHousePriceGrowth"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_4e642d38-f809-41d3-99b6-0ede5f92b735" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesHousePriceGrowth_a27166fc-7f1c-48ec-ad2f-9a4af820e8a2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesInflationRate_e4314a44-a953-4a0c-bf8b-71f685bd8fe6" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesInflationRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_4e642d38-f809-41d3-99b6-0ede5f92b735" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesInflationRate_e4314a44-a953-4a0c-bf8b-71f685bd8fe6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesCentralBankPolicyRate_f0366a38-7d59-44e2-9411-6f898dbdcaf1" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesCentralBankPolicyRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_4e642d38-f809-41d3-99b6-0ede5f92b735" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesCentralBankPolicyRate_f0366a38-7d59-44e2-9411-6f898dbdcaf1" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportScenarioweightingsDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportScenarioweightingsDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportScenarioweightingsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_a4fd5f15-a840-4040-bcb5-ba5bee948fcb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_4b7a7c11-8da4-456f-8531-0f1f2897cdcb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_a4fd5f15-a840-4040-bcb5-ba5bee948fcb" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_4b7a7c11-8da4-456f-8531-0f1f2897cdcb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioAxis_0b6fc26f-d644-4b5a-b04b-6304ab11f185" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_4b7a7c11-8da4-456f-8531-0f1f2897cdcb" xlink:to="loc_hsbc_ECLEconomicScenarioAxis_0b6fc26f-d644-4b5a-b04b-6304ab11f185" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_0b6fc26f-d644-4b5a-b04b-6304ab11f185_default" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_0b6fc26f-d644-4b5a-b04b-6304ab11f185" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_0b6fc26f-d644-4b5a-b04b-6304ab11f185_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_cedee1d1-7148-4cfd-8b50-4235e3400caf" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_0b6fc26f-d644-4b5a-b04b-6304ab11f185" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_cedee1d1-7148-4cfd-8b50-4235e3400caf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_MECScenarioMember_019f8a11-8b37-79f1-a50c-a3e0610caeda" xlink:href="hsbc-20260630.xsd#hsbc_MECScenarioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_cedee1d1-7148-4cfd-8b50-4235e3400caf" xlink:to="loc_hsbc_MECScenarioMember_019f8a11-8b37-79f1-a50c-a3e0610caeda" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_UpsideScenarioMember_705882e5-5e39-453a-bf36-4989519724ae" xlink:href="hsbc-20260630.xsd#hsbc_UpsideScenarioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_cedee1d1-7148-4cfd-8b50-4235e3400caf" xlink:to="loc_hsbc_UpsideScenarioMember_705882e5-5e39-453a-bf36-4989519724ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CentralScenarioMember_f5ae6c6b-a0f1-46af-a070-8da42605ebca" xlink:href="hsbc-20260630.xsd#hsbc_CentralScenarioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_cedee1d1-7148-4cfd-8b50-4235e3400caf" xlink:to="loc_hsbc_CentralScenarioMember_f5ae6c6b-a0f1-46af-a070-8da42605ebca" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DownsideScenarioWorstOutcomeMember_dffa3cea-3c9e-4474-825f-97cbd0153db6" xlink:href="hsbc-20260630.xsd#hsbc_DownsideScenarioWorstOutcomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_cedee1d1-7148-4cfd-8b50-4235e3400caf" xlink:to="loc_hsbc_DownsideScenarioWorstOutcomeMember_dffa3cea-3c9e-4474-825f-97cbd0153db6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DownsideScenarioAdditionalMember_d2b8c4fb-63ad-4206-83ff-7884f501c8db" xlink:href="hsbc-20260630.xsd#hsbc_DownsideScenarioAdditionalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_cedee1d1-7148-4cfd-8b50-4235e3400caf" xlink:to="loc_hsbc_DownsideScenarioAdditionalMember_d2b8c4fb-63ad-4206-83ff-7884f501c8db" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_cd0d71c2-816a-40de-9787-6c702bbd2323" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_4b7a7c11-8da4-456f-8531-0f1f2897cdcb" xlink:to="loc_srt_StatementGeographicalAxis_cd0d71c2-816a-40de-9787-6c702bbd2323" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_cd0d71c2-816a-40de-9787-6c702bbd2323_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_cd0d71c2-816a-40de-9787-6c702bbd2323" xlink:to="loc_srt_SegmentGeographicalDomain_cd0d71c2-816a-40de-9787-6c702bbd2323_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_d48eb353-b976-4c7f-b5fb-8ec5bf198762" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_cd0d71c2-816a-40de-9787-6c702bbd2323" xlink:to="loc_srt_SegmentGeographicalDomain_d48eb353-b976-4c7f-b5fb-8ec5bf198762" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_ec0b2585-eb5f-4f65-9ab3-894b978f3fc3" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d48eb353-b976-4c7f-b5fb-8ec5bf198762" xlink:to="loc_country_GB_ec0b2585-eb5f-4f65-9ab3-894b978f3fc3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019f8a1b-51ca-71c7-8a99-4dd38ca15630" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d48eb353-b976-4c7f-b5fb-8ec5bf198762" xlink:to="loc_country_US_019f8a1b-51ca-71c7-8a99-4dd38ca15630" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_HK_019f8a1b-51ca-7163-b72a-c666f9456e5c" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_HK"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d48eb353-b976-4c7f-b5fb-8ec5bf198762" xlink:to="loc_country_HK_019f8a1b-51ca-7163-b72a-c666f9456e5c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_019f8a1b-51ca-791c-92c7-575c9aaa4c78" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d48eb353-b976-4c7f-b5fb-8ec5bf198762" xlink:to="loc_country_CN_019f8a1b-51ca-791c-92c7-575c9aaa4c78" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_FR_019f8a1b-51ca-75ca-b420-810ea9d9c434" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_FR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d48eb353-b976-4c7f-b5fb-8ec5bf198762" xlink:to="loc_country_FR_019f8a1b-51ca-75ca-b420-810ea9d9c434" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_AE_758482de-12ce-4f09-87d0-ee5581ee0c5f" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_AE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d48eb353-b976-4c7f-b5fb-8ec5bf198762" xlink:to="loc_country_AE_758482de-12ce-4f09-87d0-ee5581ee0c5f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MX_019f8a1b-51ca-704d-90a3-63045c8b90b0" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_MX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_d48eb353-b976-4c7f-b5fb-8ec5bf198762" xlink:to="loc_country_MX_019f8a1b-51ca-704d-90a3-63045c8b90b0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesProbability_dd4555d7-2e38-4908-8072-6f65c9869464" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesProbability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_a4fd5f15-a840-4040-bcb5-ba5bee948fcb" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesProbability_dd4555d7-2e38-4908-8072-6f65c9869464" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NumberOfMarketsWithLowerLevelOfUncertainty_aff184f3-1c48-4b7f-a4ab-a7097fda350b" xlink:href="hsbc-20260630.xsd#hsbc_NumberOfMarketsWithLowerLevelOfUncertainty"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_a4fd5f15-a840-4040-bcb5-ba5bee948fcb" xlink:to="loc_hsbc_NumberOfMarketsWithLowerLevelOfUncertainty_aff184f3-1c48-4b7f-a4ab-a7097fda350b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportManagementjudgementaladjustmentsDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportManagementjudgementaladjustmentsDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportManagementjudgementaladjustmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_d6e6cb06-53d5-4744-9bf2-f308ce9558b3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_bd58bd85-5d97-4d10-bcf4-f79d93d09c7d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_d6e6cb06-53d5-4744-9bf2-f308ce9558b3" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_bd58bd85-5d97-4d10-bcf4-f79d93d09c7d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IndustrySector1Axis_8a1a5137-9a5c-472e-945b-05b18d44f8f7" xlink:href="hsbc-20260630.xsd#hsbc_IndustrySector1Axis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_bd58bd85-5d97-4d10-bcf4-f79d93d09c7d" xlink:to="loc_hsbc_IndustrySector1Axis_8a1a5137-9a5c-472e-945b-05b18d44f8f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IndustrySector1Domain_8a1a5137-9a5c-472e-945b-05b18d44f8f7_default" xlink:href="hsbc-20260630.xsd#hsbc_IndustrySector1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_IndustrySector1Axis_8a1a5137-9a5c-472e-945b-05b18d44f8f7" xlink:to="loc_hsbc_IndustrySector1Domain_8a1a5137-9a5c-472e-945b-05b18d44f8f7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IndustrySector1Domain_3776f8fd-3e77-4313-8009-46c33409c882" xlink:href="hsbc-20260630.xsd#hsbc_IndustrySector1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_IndustrySector1Axis_8a1a5137-9a5c-472e-945b-05b18d44f8f7" xlink:to="loc_hsbc_IndustrySector1Domain_3776f8fd-3e77-4313-8009-46c33409c882" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ExcludingManagementJudgementalAdjustmentsMember_7b64339d-5bc0-4907-94e9-c7400bfa5a0c" xlink:href="hsbc-20260630.xsd#hsbc_ExcludingManagementJudgementalAdjustmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IndustrySector1Domain_3776f8fd-3e77-4313-8009-46c33409c882" xlink:to="loc_hsbc_ExcludingManagementJudgementalAdjustmentsMember_7b64339d-5bc0-4907-94e9-c7400bfa5a0c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BanksSovereignsAndGovernmentEntitiesMember_e640e065-3d61-47e7-8cad-2aba0fb3a6db" xlink:href="hsbc-20260630.xsd#hsbc_BanksSovereignsAndGovernmentEntitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IndustrySector1Domain_3776f8fd-3e77-4313-8009-46c33409c882" xlink:to="loc_hsbc_BanksSovereignsAndGovernmentEntitiesMember_e640e065-3d61-47e7-8cad-2aba0fb3a6db" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CorporateLendingAdjustmentsMember_61594e60-775b-4a8e-b0c3-9dca47504a11" xlink:href="hsbc-20260630.xsd#hsbc_CorporateLendingAdjustmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IndustrySector1Domain_3776f8fd-3e77-4313-8009-46c33409c882" xlink:to="loc_hsbc_CorporateLendingAdjustmentsMember_61594e60-775b-4a8e-b0c3-9dca47504a11" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherRetailLendingAdjustmentsMember_2aa56df1-ef94-4165-91bc-87adb480c495" xlink:href="hsbc-20260630.xsd#hsbc_OtherRetailLendingAdjustmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IndustrySector1Domain_3776f8fd-3e77-4313-8009-46c33409c882" xlink:to="loc_hsbc_OtherRetailLendingAdjustmentsMember_2aa56df1-ef94-4165-91bc-87adb480c495" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ManagementJudgementalAdjustmentsMember_03efceb8-de6d-4b4f-bbf9-1fde6d53fedd" xlink:href="hsbc-20260630.xsd#hsbc_ManagementJudgementalAdjustmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IndustrySector1Domain_3776f8fd-3e77-4313-8009-46c33409c882" xlink:to="loc_hsbc_ManagementJudgementalAdjustmentsMember_03efceb8-de6d-4b4f-bbf9-1fde6d53fedd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherMacroeconomicRelatedAdjustmentsMember_e7933454-e5c0-4a95-a9c4-fdd4aeea0919" xlink:href="hsbc-20260630.xsd#hsbc_OtherMacroeconomicRelatedAdjustmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_IndustrySector1Domain_3776f8fd-3e77-4313-8009-46c33409c882" xlink:to="loc_hsbc_OtherMacroeconomicRelatedAdjustmentsMember_e7933454-e5c0-4a95-a9c4-fdd4aeea0919" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersAxis_30483d5e-3449-4b43-92ff-c7b2a2d98a1a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_bd58bd85-5d97-4d10-bcf4-f79d93d09c7d" xlink:to="loc_ifrs-full_TypesOfCustomersAxis_30483d5e-3449-4b43-92ff-c7b2a2d98a1a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersDomain_30483d5e-3449-4b43-92ff-c7b2a2d98a1a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfCustomersAxis_30483d5e-3449-4b43-92ff-c7b2a2d98a1a" xlink:to="loc_ifrs-full_TypesOfCustomersDomain_30483d5e-3449-4b43-92ff-c7b2a2d98a1a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersDomain_3ff00f68-d7fc-42fe-89a4-eefbea0b5366" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfCustomersAxis_30483d5e-3449-4b43-92ff-c7b2a2d98a1a" xlink:to="loc_ifrs-full_TypesOfCustomersDomain_3ff00f68-d7fc-42fe-89a4-eefbea0b5366" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_RetailLendingMember_175be843-ef3a-4238-bd17-f083861a2541" xlink:href="hsbc-20260630.xsd#hsbc_RetailLendingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfCustomersDomain_3ff00f68-d7fc-42fe-89a4-eefbea0b5366" xlink:to="loc_hsbc_RetailLendingMember_175be843-ef3a-4238-bd17-f083861a2541" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_WholesaleLendingSectorMember_5124fe64-7e62-4762-81af-94cab5efecdd" xlink:href="hsbc-20260630.xsd#hsbc_WholesaleLendingSectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfCustomersDomain_3ff00f68-d7fc-42fe-89a4-eefbea0b5366" xlink:to="loc_hsbc_WholesaleLendingSectorMember_5124fe64-7e62-4762-81af-94cab5efecdd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_dfdfc1c7-b993-41c7-bb34-3c2d914bcfab" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_bd58bd85-5d97-4d10-bcf4-f79d93d09c7d" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_dfdfc1c7-b993-41c7-bb34-3c2d914bcfab" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_dfdfc1c7-b993-41c7-bb34-3c2d914bcfab_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_dfdfc1c7-b993-41c7-bb34-3c2d914bcfab" xlink:to="loc_ifrs-full_CarryingAmountMember_dfdfc1c7-b993-41c7-bb34-3c2d914bcfab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_52364692-52e8-4c83-9335-11bc827c5c9f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_dfdfc1c7-b993-41c7-bb34-3c2d914bcfab" xlink:to="loc_ifrs-full_CarryingAmountMember_52364692-52e8-4c83-9335-11bc827c5c9f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedImpairmentMember_f5c29a4b-6a6f-487f-9123-dd99deb112f0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedImpairmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_52364692-52e8-4c83-9335-11bc827c5c9f" xlink:to="loc_ifrs-full_AccumulatedImpairmentMember_f5c29a4b-6a6f-487f-9123-dd99deb112f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInFinancialAssets_fbebda38-6238-496c-8c66-b4a93f55b2e3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseInFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_d6e6cb06-53d5-4744-9bf2-f308ce9558b3" xlink:to="loc_ifrs-full_IncreaseDecreaseInFinancialAssets_fbebda38-6238-496c-8c66-b4a93f55b2e3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossLoansAndAdvances_b36d3514-8c47-43fc-b052-7a4da480d24d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossLoansAndAdvances"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_d6e6cb06-53d5-4744-9bf2-f308ce9558b3" xlink:to="loc_ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLossLoansAndAdvances_b36d3514-8c47-43fc-b052-7a4da480d24d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAndAssumptionsAndEstimationTechniquesExpectedCreditLossWeightAssignedToScenarios_dd811f93-c1b6-4b41-a980-0edf358a6007" xlink:href="hsbc-20260630.xsd#hsbc_InputsAndAssumptionsAndEstimationTechniquesExpectedCreditLossWeightAssignedToScenarios"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_d6e6cb06-53d5-4744-9bf2-f308ce9558b3" xlink:to="loc_hsbc_InputsAndAssumptionsAndEstimationTechniquesExpectedCreditLossWeightAssignedToScenarios_dd811f93-c1b6-4b41-a980-0edf358a6007" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_TotalNumberOfEconomicScenariosToCalculateECL_6ad702b8-cbf9-4200-8462-cdfa37b68eda" xlink:href="hsbc-20260630.xsd#hsbc_TotalNumberOfEconomicScenariosToCalculateECL"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_d6e6cb06-53d5-4744-9bf2-f308ce9558b3" xlink:to="loc_hsbc_TotalNumberOfEconomicScenariosToCalculateECL_6ad702b8-cbf9-4200-8462-cdfa37b68eda" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportWholesaleanalysisDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportWholesaleanalysisDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportWholesaleanalysisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_7e1eabea-5c1f-4680-9c7c-6a5518efd5c0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_4e1ce20f-c23a-4e99-9fa7-730933828575" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_7e1eabea-5c1f-4680-9c7c-6a5518efd5c0" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_4e1ce20f-c23a-4e99-9fa7-730933828575" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_92e92c8f-5f69-40d8-9ea4-5f2e308a8092" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_4e1ce20f-c23a-4e99-9fa7-730933828575" xlink:to="loc_srt_StatementGeographicalAxis_92e92c8f-5f69-40d8-9ea4-5f2e308a8092" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_92e92c8f-5f69-40d8-9ea4-5f2e308a8092_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_92e92c8f-5f69-40d8-9ea4-5f2e308a8092" xlink:to="loc_srt_SegmentGeographicalDomain_92e92c8f-5f69-40d8-9ea4-5f2e308a8092_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_23afe77d-5442-4883-9101-92f0885ac2c7" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_92e92c8f-5f69-40d8-9ea4-5f2e308a8092" xlink:to="loc_srt_SegmentGeographicalDomain_23afe77d-5442-4883-9101-92f0885ac2c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_f31e2798-7e12-425f-9eb4-17e81e2f0da8" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_23afe77d-5442-4883-9101-92f0885ac2c7" xlink:to="loc_country_GB_f31e2798-7e12-425f-9eb4-17e81e2f0da8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_ac85487a-e3ab-4078-8a8a-8e4c315a687d" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_23afe77d-5442-4883-9101-92f0885ac2c7" xlink:to="loc_country_US_ac85487a-e3ab-4078-8a8a-8e4c315a687d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_HK_09e5b205-420f-4932-b1cb-ffd119b7eeb8" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_HK"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_23afe77d-5442-4883-9101-92f0885ac2c7" xlink:to="loc_country_HK_09e5b205-420f-4932-b1cb-ffd119b7eeb8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_31df261f-21b2-4941-8407-b1ab39646a3e" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_23afe77d-5442-4883-9101-92f0885ac2c7" xlink:to="loc_country_CN_31df261f-21b2-4941-8407-b1ab39646a3e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MX_4b5652ce-1cc2-4d2b-a21e-5b209eff34d7" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_MX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_23afe77d-5442-4883-9101-92f0885ac2c7" xlink:to="loc_country_MX_4b5652ce-1cc2-4d2b-a21e-5b209eff34d7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_AE_8cbd2dd2-181d-4a7f-b923-7365f967d9dd" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_AE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_23afe77d-5442-4883-9101-92f0885ac2c7" xlink:to="loc_country_AE_8cbd2dd2-181d-4a7f-b923-7365f967d9dd" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_FR_7befffca-bff2-4165-825d-5b56ed85dd48" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_FR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_23afe77d-5442-4883-9101-92f0885ac2c7" xlink:to="loc_country_FR_7befffca-bff2-4165-825d-5b56ed85dd48" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherCountriesTerritoriesMember_fcc392b4-1531-43b1-9320-08be8721953d" xlink:href="hsbc-20260630.xsd#hsbc_OtherCountriesTerritoriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_23afe77d-5442-4883-9101-92f0885ac2c7" xlink:to="loc_hsbc_OtherCountriesTerritoriesMember_fcc392b4-1531-43b1-9320-08be8721953d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_ac2a9bdc-2b27-4358-8c75-cda73459bf99" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_4e1ce20f-c23a-4e99-9fa7-730933828575" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_ac2a9bdc-2b27-4358-8c75-cda73459bf99" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_ac2a9bdc-2b27-4358-8c75-cda73459bf99_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_ac2a9bdc-2b27-4358-8c75-cda73459bf99" xlink:to="loc_ifrs-full_CarryingAmountMember_ac2a9bdc-2b27-4358-8c75-cda73459bf99_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_0eee22f6-3b04-4a49-bc58-bac70fdee470" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_ac2a9bdc-2b27-4358-8c75-cda73459bf99" xlink:to="loc_ifrs-full_CarryingAmountMember_0eee22f6-3b04-4a49-bc58-bac70fdee470" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_eb1a8093-25a5-41c1-b941-505e61e98ed5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_0eee22f6-3b04-4a49-bc58-bac70fdee470" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_eb1a8093-25a5-41c1-b941-505e61e98ed5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedImpairmentMember_84e0d588-3833-4cfe-83bb-5e7861cf15d1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedImpairmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_0eee22f6-3b04-4a49-bc58-bac70fdee470" xlink:to="loc_ifrs-full_AccumulatedImpairmentMember_84e0d588-3833-4cfe-83bb-5e7861cf15d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersAxis_6b76ab74-fe1a-4e39-9ae0-6a959426ebd0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_4e1ce20f-c23a-4e99-9fa7-730933828575" xlink:to="loc_ifrs-full_TypesOfCustomersAxis_6b76ab74-fe1a-4e39-9ae0-6a959426ebd0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersDomain_6b76ab74-fe1a-4e39-9ae0-6a959426ebd0_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfCustomersAxis_6b76ab74-fe1a-4e39-9ae0-6a959426ebd0" xlink:to="loc_ifrs-full_TypesOfCustomersDomain_6b76ab74-fe1a-4e39-9ae0-6a959426ebd0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersDomain_f32b0834-96a1-47b3-8ae4-e19cd7ef29fa" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfCustomersAxis_6b76ab74-fe1a-4e39-9ae0-6a959426ebd0" xlink:to="loc_ifrs-full_TypesOfCustomersDomain_f32b0834-96a1-47b3-8ae4-e19cd7ef29fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_WholesaleLendingSectorMember_b8a446f1-929d-4afb-a0a5-c59797ece676" xlink:href="hsbc-20260630.xsd#hsbc_WholesaleLendingSectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfCustomersDomain_f32b0834-96a1-47b3-8ae4-e19cd7ef29fa" xlink:to="loc_hsbc_WholesaleLendingSectorMember_b8a446f1-929d-4afb-a0a5-c59797ece676" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioAxis_3c174aa9-a805-488a-af43-7e4e358c2d3b" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_4e1ce20f-c23a-4e99-9fa7-730933828575" xlink:to="loc_hsbc_ECLEconomicScenarioAxis_3c174aa9-a805-488a-af43-7e4e358c2d3b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_3c174aa9-a805-488a-af43-7e4e358c2d3b_default" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_3c174aa9-a805-488a-af43-7e4e358c2d3b" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_3c174aa9-a805-488a-af43-7e4e358c2d3b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_1cdea6bd-ae97-4b84-927a-e77412a1e6f1" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_3c174aa9-a805-488a-af43-7e4e358c2d3b" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_1cdea6bd-ae97-4b84-927a-e77412a1e6f1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CentralScenarioMember_be09fc31-edec-4388-928d-32e68f2c5ca5" xlink:href="hsbc-20260630.xsd#hsbc_CentralScenarioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_1cdea6bd-ae97-4b84-927a-e77412a1e6f1" xlink:to="loc_hsbc_CentralScenarioMember_be09fc31-edec-4388-928d-32e68f2c5ca5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_UpsideScenarioMember_9b850eb0-6306-446b-a7be-df6e586eb3cd" xlink:href="hsbc-20260630.xsd#hsbc_UpsideScenarioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_1cdea6bd-ae97-4b84-927a-e77412a1e6f1" xlink:to="loc_hsbc_UpsideScenarioMember_9b850eb0-6306-446b-a7be-df6e586eb3cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DownsideScenarioWorstOutcomeMember_995ac0af-d66b-412c-a8f0-d8a291985583" xlink:href="hsbc-20260630.xsd#hsbc_DownsideScenarioWorstOutcomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_1cdea6bd-ae97-4b84-927a-e77412a1e6f1" xlink:to="loc_hsbc_DownsideScenarioWorstOutcomeMember_995ac0af-d66b-412c-a8f0-d8a291985583" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DownsideScenarioAdditionalMember_d5640720-9bcd-4180-8565-0da0164743ff" xlink:href="hsbc-20260630.xsd#hsbc_DownsideScenarioAdditionalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_1cdea6bd-ae97-4b84-927a-e77412a1e6f1" xlink:to="loc_hsbc_DownsideScenarioAdditionalMember_d5640720-9bcd-4180-8565-0da0164743ff" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_9e91ec2a-e370-42e9-8fe9-9e5503fe753a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_4e1ce20f-c23a-4e99-9fa7-730933828575" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_9e91ec2a-e370-42e9-8fe9-9e5503fe753a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_9e91ec2a-e370-42e9-8fe9-9e5503fe753a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_9e91ec2a-e370-42e9-8fe9-9e5503fe753a" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_9e91ec2a-e370-42e9-8fe9-9e5503fe753a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_4f12098a-f386-4d23-b872-ccc64e43c491" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_9e91ec2a-e370-42e9-8fe9-9e5503fe753a" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_4f12098a-f386-4d23-b872-ccc64e43c491" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsNotCreditimpairedMember_cc57288e-6d22-4e5f-bd09-6406c006a4e6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsNotCreditimpairedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_4f12098a-f386-4d23-b872-ccc64e43c491" xlink:to="loc_ifrs-full_FinancialInstrumentsNotCreditimpairedMember_cc57288e-6d22-4e5f-bd09-6406c006a4e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_4147e736-a5f4-4007-8d01-b8aaf19fd9e1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_4e1ce20f-c23a-4e99-9fa7-730933828575" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_4147e736-a5f4-4007-8d01-b8aaf19fd9e1" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_4147e736-a5f4-4007-8d01-b8aaf19fd9e1_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_4147e736-a5f4-4007-8d01-b8aaf19fd9e1" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_4147e736-a5f4-4007-8d01-b8aaf19fd9e1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_ef145202-a3e4-4679-b185-8da8cdb83229" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_4147e736-a5f4-4007-8d01-b8aaf19fd9e1" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_ef145202-a3e4-4679-b185-8da8cdb83229" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TwelvemonthExpectedCreditLossesMember_f552e1c0-c81e-4206-8845-65fda60d9366" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TwelvemonthExpectedCreditLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_ef145202-a3e4-4679-b185-8da8cdb83229" xlink:to="loc_ifrs-full_TwelvemonthExpectedCreditLossesMember_f552e1c0-c81e-4206-8845-65fda60d9366" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LifetimeExpectedCreditLossesMember_7ec22888-8350-4082-b80b-471a610b8c93" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LifetimeExpectedCreditLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_ef145202-a3e4-4679-b185-8da8cdb83229" xlink:to="loc_ifrs-full_LifetimeExpectedCreditLossesMember_7ec22888-8350-4082-b80b-471a610b8c93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAndAssumptionsAndEstimationTechniquesExpectedCreditLossWeightAssignedToScenarios_240e8b16-1439-407c-996a-fbdad1acc067" xlink:href="hsbc-20260630.xsd#hsbc_InputsAndAssumptionsAndEstimationTechniquesExpectedCreditLossWeightAssignedToScenarios"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_7e1eabea-5c1f-4680-9c7c-6a5518efd5c0" xlink:to="loc_hsbc_InputsAndAssumptionsAndEstimationTechniquesExpectedCreditLossWeightAssignedToScenarios_240e8b16-1439-407c-996a-fbdad1acc067" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseInAllowanceForExpectedCreditLosses_9f73a97e-82b7-4460-a775-59adc29545cd" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseInAllowanceForExpectedCreditLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_7e1eabea-5c1f-4680-9c7c-6a5518efd5c0" xlink:to="loc_hsbc_IncreaseDecreaseInAllowanceForExpectedCreditLosses_9f73a97e-82b7-4460-a775-59adc29545cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_2cd23ea4-934e-4873-a9e5-841674ea8e3b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_7e1eabea-5c1f-4680-9c7c-6a5518efd5c0" xlink:to="loc_ifrs-full_FinancialAssets_2cd23ea4-934e-4873-a9e5-841674ea8e3b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportRetailanalysisDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportRetailanalysisDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportRetailanalysisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_2fbdb6b8-2f26-4713-b116-b220ae666e2b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_a612270e-a3e4-467e-8243-385dfc57bf0d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_2fbdb6b8-2f26-4713-b116-b220ae666e2b" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_a612270e-a3e4-467e-8243-385dfc57bf0d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_9dafb44d-8715-44a8-a9aa-b9298131b38c" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_a612270e-a3e4-467e-8243-385dfc57bf0d" xlink:to="loc_srt_StatementGeographicalAxis_9dafb44d-8715-44a8-a9aa-b9298131b38c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_9dafb44d-8715-44a8-a9aa-b9298131b38c_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_9dafb44d-8715-44a8-a9aa-b9298131b38c" xlink:to="loc_srt_SegmentGeographicalDomain_9dafb44d-8715-44a8-a9aa-b9298131b38c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_70a05d6e-57a6-42bd-a7bc-fd1365a4ac39" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_9dafb44d-8715-44a8-a9aa-b9298131b38c" xlink:to="loc_srt_SegmentGeographicalDomain_70a05d6e-57a6-42bd-a7bc-fd1365a4ac39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_2ebc81b4-9953-4f1a-ac60-02c7056848e6" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_GB"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_70a05d6e-57a6-42bd-a7bc-fd1365a4ac39" xlink:to="loc_country_GB_2ebc81b4-9953-4f1a-ac60-02c7056848e6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MX_568994fb-77cd-4c64-b2e6-a308481d3663" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_MX"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_70a05d6e-57a6-42bd-a7bc-fd1365a4ac39" xlink:to="loc_country_MX_568994fb-77cd-4c64-b2e6-a308481d3663" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_HK_70c2b505-233c-41fb-a6ce-dbd321329ea4" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_HK"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_70a05d6e-57a6-42bd-a7bc-fd1365a4ac39" xlink:to="loc_country_HK_70c2b505-233c-41fb-a6ce-dbd321329ea4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_AE_e0ddeb0d-a714-4af8-b650-3cede593a2c9" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_AE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_70a05d6e-57a6-42bd-a7bc-fd1365a4ac39" xlink:to="loc_country_AE_e0ddeb0d-a714-4af8-b650-3cede593a2c9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_8692b658-2d93-4cd2-83fc-005d2300d0e0" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_70a05d6e-57a6-42bd-a7bc-fd1365a4ac39" xlink:to="loc_country_US_8692b658-2d93-4cd2-83fc-005d2300d0e0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherCountriesTerritoriesMember_10fc8f33-b2df-44f4-aed1-d24000b7d46d" xlink:href="hsbc-20260630.xsd#hsbc_OtherCountriesTerritoriesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_70a05d6e-57a6-42bd-a7bc-fd1365a4ac39" xlink:to="loc_hsbc_OtherCountriesTerritoriesMember_10fc8f33-b2df-44f4-aed1-d24000b7d46d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_5dcebd7c-b1d3-4bbb-9332-dea672f3a14d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_a612270e-a3e4-467e-8243-385dfc57bf0d" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_5dcebd7c-b1d3-4bbb-9332-dea672f3a14d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_5dcebd7c-b1d3-4bbb-9332-dea672f3a14d_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_5dcebd7c-b1d3-4bbb-9332-dea672f3a14d" xlink:to="loc_ifrs-full_CarryingAmountMember_5dcebd7c-b1d3-4bbb-9332-dea672f3a14d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_b1cff773-46fa-4a55-ae27-0abb04913f87" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_5dcebd7c-b1d3-4bbb-9332-dea672f3a14d" xlink:to="loc_ifrs-full_CarryingAmountMember_b1cff773-46fa-4a55-ae27-0abb04913f87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_aac3c7f3-8730-4cb9-b2fd-8c9299451316" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_b1cff773-46fa-4a55-ae27-0abb04913f87" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_aac3c7f3-8730-4cb9-b2fd-8c9299451316" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedImpairmentMember_a0bf0b48-5270-4f50-a54e-666b930d805b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedImpairmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_b1cff773-46fa-4a55-ae27-0abb04913f87" xlink:to="loc_ifrs-full_AccumulatedImpairmentMember_a0bf0b48-5270-4f50-a54e-666b930d805b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis_92a04d2d-c42f-4536-b8ff-24064248e7e7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_a612270e-a3e4-467e-8243-385dfc57bf0d" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsAxis_92a04d2d-c42f-4536-b8ff-24064248e7e7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_92a04d2d-c42f-4536-b8ff-24064248e7e7_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_92a04d2d-c42f-4536-b8ff-24064248e7e7" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_92a04d2d-c42f-4536-b8ff-24064248e7e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_e73791d9-3a61-4c32-938b-0fa79d20fb2d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_92a04d2d-c42f-4536-b8ff-24064248e7e7" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_e73791d9-3a61-4c32-938b-0fa79d20fb2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MortgagesMember_ee445977-95d3-49ce-9087-df91b7dc5575" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MortgagesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_e73791d9-3a61-4c32-938b-0fa79d20fb2d" xlink:to="loc_ifrs-full_MortgagesMember_ee445977-95d3-49ce-9087-df91b7dc5575" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_RetailOverdraftsAndCreditCardsMember_5bcca1dc-bd23-4214-a203-fdd5241454ac" xlink:href="hsbc-20260630.xsd#hsbc_RetailOverdraftsAndCreditCardsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_e73791d9-3a61-4c32-938b-0fa79d20fb2d" xlink:to="loc_hsbc_RetailOverdraftsAndCreditCardsMember_5bcca1dc-bd23-4214-a203-fdd5241454ac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherFinancialAssetsMember_a8cb621e-01fb-4024-897d-216ac041d9f4" xlink:href="hsbc-20260630.xsd#hsbc_OtherFinancialAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_e73791d9-3a61-4c32-938b-0fa79d20fb2d" xlink:to="loc_hsbc_OtherFinancialAssetsMember_a8cb621e-01fb-4024-897d-216ac041d9f4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersAxis_3158a67e-3220-47d4-ab0f-1fc51a729086" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_a612270e-a3e4-467e-8243-385dfc57bf0d" xlink:to="loc_ifrs-full_TypesOfCustomersAxis_3158a67e-3220-47d4-ab0f-1fc51a729086" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersDomain_3158a67e-3220-47d4-ab0f-1fc51a729086_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfCustomersAxis_3158a67e-3220-47d4-ab0f-1fc51a729086" xlink:to="loc_ifrs-full_TypesOfCustomersDomain_3158a67e-3220-47d4-ab0f-1fc51a729086_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersDomain_3952516f-7fbc-48e4-9ab3-3ddce7ee811d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfCustomersAxis_3158a67e-3220-47d4-ab0f-1fc51a729086" xlink:to="loc_ifrs-full_TypesOfCustomersDomain_3952516f-7fbc-48e4-9ab3-3ddce7ee811d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_RetailLendingMember_7f2ade2e-543d-409c-9a84-5691d94ea516" xlink:href="hsbc-20260630.xsd#hsbc_RetailLendingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfCustomersDomain_3952516f-7fbc-48e4-9ab3-3ddce7ee811d" xlink:to="loc_hsbc_RetailLendingMember_7f2ade2e-543d-409c-9a84-5691d94ea516" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioAxis_961fa919-82b0-486a-9e6f-3317a62a13d0" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_a612270e-a3e4-467e-8243-385dfc57bf0d" xlink:to="loc_hsbc_ECLEconomicScenarioAxis_961fa919-82b0-486a-9e6f-3317a62a13d0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_961fa919-82b0-486a-9e6f-3317a62a13d0_default" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_961fa919-82b0-486a-9e6f-3317a62a13d0" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_961fa919-82b0-486a-9e6f-3317a62a13d0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_893d74a8-dbb6-4b4d-b5e5-e6db6074261a" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_961fa919-82b0-486a-9e6f-3317a62a13d0" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_893d74a8-dbb6-4b4d-b5e5-e6db6074261a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CentralScenarioMember_81f1dc61-75ae-4b86-a35e-2c033f040fef" xlink:href="hsbc-20260630.xsd#hsbc_CentralScenarioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_893d74a8-dbb6-4b4d-b5e5-e6db6074261a" xlink:to="loc_hsbc_CentralScenarioMember_81f1dc61-75ae-4b86-a35e-2c033f040fef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_UpsideScenarioMember_84b8ff7f-968f-4482-89e4-7eb52464d1e2" xlink:href="hsbc-20260630.xsd#hsbc_UpsideScenarioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_893d74a8-dbb6-4b4d-b5e5-e6db6074261a" xlink:to="loc_hsbc_UpsideScenarioMember_84b8ff7f-968f-4482-89e4-7eb52464d1e2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DownsideScenarioWorstOutcomeMember_7b9c0dda-6107-44b3-bd94-b366807399b2" xlink:href="hsbc-20260630.xsd#hsbc_DownsideScenarioWorstOutcomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_893d74a8-dbb6-4b4d-b5e5-e6db6074261a" xlink:to="loc_hsbc_DownsideScenarioWorstOutcomeMember_7b9c0dda-6107-44b3-bd94-b366807399b2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DownsideScenarioAdditionalMember_f882ff75-add3-4de5-a16b-42433a0f6812" xlink:href="hsbc-20260630.xsd#hsbc_DownsideScenarioAdditionalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_893d74a8-dbb6-4b4d-b5e5-e6db6074261a" xlink:to="loc_hsbc_DownsideScenarioAdditionalMember_f882ff75-add3-4de5-a16b-42433a0f6812" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_84e36cf3-df2c-4c98-897a-913605c5ff44" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_a612270e-a3e4-467e-8243-385dfc57bf0d" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_84e36cf3-df2c-4c98-897a-913605c5ff44" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_84e36cf3-df2c-4c98-897a-913605c5ff44_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_84e36cf3-df2c-4c98-897a-913605c5ff44" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_84e36cf3-df2c-4c98-897a-913605c5ff44_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_1ddfc22f-4249-413e-bd40-3d20780e49f8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_84e36cf3-df2c-4c98-897a-913605c5ff44" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_1ddfc22f-4249-413e-bd40-3d20780e49f8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsNotCreditimpairedMember_01801f73-c150-40e0-ab27-4398f2c2d052" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsNotCreditimpairedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_1ddfc22f-4249-413e-bd40-3d20780e49f8" xlink:to="loc_ifrs-full_FinancialInstrumentsNotCreditimpairedMember_01801f73-c150-40e0-ab27-4398f2c2d052" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsCreditimpairedAfterPurchaseOrOriginationMember_87fce3d2-a4a5-40cc-82a9-62f749f8ada1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsCreditimpairedAfterPurchaseOrOriginationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_1ddfc22f-4249-413e-bd40-3d20780e49f8" xlink:to="loc_ifrs-full_FinancialInstrumentsCreditimpairedAfterPurchaseOrOriginationMember_87fce3d2-a4a5-40cc-82a9-62f749f8ada1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_13af7a23-2f2f-4671-89a0-5794d05413de" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_a612270e-a3e4-467e-8243-385dfc57bf0d" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_13af7a23-2f2f-4671-89a0-5794d05413de" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_13af7a23-2f2f-4671-89a0-5794d05413de_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_13af7a23-2f2f-4671-89a0-5794d05413de" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_13af7a23-2f2f-4671-89a0-5794d05413de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_767e4b78-1f8f-476c-9817-22dedfd3cf47" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_13af7a23-2f2f-4671-89a0-5794d05413de" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_767e4b78-1f8f-476c-9817-22dedfd3cf47" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TwelvemonthExpectedCreditLossesMember_2119f78d-1794-4c07-9cbd-15c552113bf5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TwelvemonthExpectedCreditLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_767e4b78-1f8f-476c-9817-22dedfd3cf47" xlink:to="loc_ifrs-full_TwelvemonthExpectedCreditLossesMember_2119f78d-1794-4c07-9cbd-15c552113bf5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LifetimeExpectedCreditLossesMember_a1ff173b-182f-448a-9352-cccbc077baac" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LifetimeExpectedCreditLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_767e4b78-1f8f-476c-9817-22dedfd3cf47" xlink:to="loc_ifrs-full_LifetimeExpectedCreditLossesMember_a1ff173b-182f-448a-9352-cccbc077baac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_74ceb33a-d48d-4882-addb-317b48bddd08" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_2fbdb6b8-2f26-4713-b116-b220ae666e2b" xlink:to="loc_ifrs-full_FinancialAssets_74ceb33a-d48d-4882-addb-317b48bddd08" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseInAllowanceForExpectedCreditLosses_9316fbc6-0d2b-42b4-a853-007592ef857b" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseInAllowanceForExpectedCreditLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_2fbdb6b8-2f26-4713-b116-b220ae666e2b" xlink:to="loc_hsbc_IncreaseDecreaseInAllowanceForExpectedCreditLosses_9316fbc6-0d2b-42b4-a853-007592ef857b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportGroupECLsensitivityresultsDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportGroupECLsensitivityresultsDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportGroupECLsensitivityresultsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_48d44166-e0ab-4f92-8197-04c304e12026" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_253d6534-5081-491a-88be-ecb753dcde76" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_48d44166-e0ab-4f92-8197-04c304e12026" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_253d6534-5081-491a-88be-ecb753dcde76" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_b13e4ca9-17d0-46b5-b048-a14a728a3bee" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_253d6534-5081-491a-88be-ecb753dcde76" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_b13e4ca9-17d0-46b5-b048-a14a728a3bee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_b13e4ca9-17d0-46b5-b048-a14a728a3bee_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_b13e4ca9-17d0-46b5-b048-a14a728a3bee" xlink:to="loc_ifrs-full_CarryingAmountMember_b13e4ca9-17d0-46b5-b048-a14a728a3bee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_7427a5ff-51d1-47d0-9eea-3915a3a8c642" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_b13e4ca9-17d0-46b5-b048-a14a728a3bee" xlink:to="loc_ifrs-full_CarryingAmountMember_7427a5ff-51d1-47d0-9eea-3915a3a8c642" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedImpairmentMember_8df8d64d-fe9b-4d57-ba32-9c2f6bfa2d23" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedImpairmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_7427a5ff-51d1-47d0-9eea-3915a3a8c642" xlink:to="loc_ifrs-full_AccumulatedImpairmentMember_8df8d64d-fe9b-4d57-ba32-9c2f6bfa2d23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersAxis_6ec11282-5dfc-4473-84ee-ae46e8d84811" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_253d6534-5081-491a-88be-ecb753dcde76" xlink:to="loc_ifrs-full_TypesOfCustomersAxis_6ec11282-5dfc-4473-84ee-ae46e8d84811" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersDomain_6ec11282-5dfc-4473-84ee-ae46e8d84811_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfCustomersAxis_6ec11282-5dfc-4473-84ee-ae46e8d84811" xlink:to="loc_ifrs-full_TypesOfCustomersDomain_6ec11282-5dfc-4473-84ee-ae46e8d84811_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersDomain_257f38a7-ffa5-494c-b8da-2fca3d2559b9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfCustomersAxis_6ec11282-5dfc-4473-84ee-ae46e8d84811" xlink:to="loc_ifrs-full_TypesOfCustomersDomain_257f38a7-ffa5-494c-b8da-2fca3d2559b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_RetailLendingMember_28b3a2b5-3627-4398-8d96-1b85e4a95f0e" xlink:href="hsbc-20260630.xsd#hsbc_RetailLendingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfCustomersDomain_257f38a7-ffa5-494c-b8da-2fca3d2559b9" xlink:to="loc_hsbc_RetailLendingMember_28b3a2b5-3627-4398-8d96-1b85e4a95f0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_WholesaleLendingSectorMember_02ade6ca-0aba-4a73-8d8f-8c730275871b" xlink:href="hsbc-20260630.xsd#hsbc_WholesaleLendingSectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfCustomersDomain_257f38a7-ffa5-494c-b8da-2fca3d2559b9" xlink:to="loc_hsbc_WholesaleLendingSectorMember_02ade6ca-0aba-4a73-8d8f-8c730275871b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioAxis_b33dc039-21e2-4b75-b9a7-875923e2fcfb" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_253d6534-5081-491a-88be-ecb753dcde76" xlink:to="loc_hsbc_ECLEconomicScenarioAxis_b33dc039-21e2-4b75-b9a7-875923e2fcfb" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_b33dc039-21e2-4b75-b9a7-875923e2fcfb_default" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_b33dc039-21e2-4b75-b9a7-875923e2fcfb" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_b33dc039-21e2-4b75-b9a7-875923e2fcfb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ECLEconomicScenarioDomain_c72b0df9-e1b0-47ff-8096-653a8f0a0e89" xlink:href="hsbc-20260630.xsd#hsbc_ECLEconomicScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_ECLEconomicScenarioAxis_b33dc039-21e2-4b75-b9a7-875923e2fcfb" xlink:to="loc_hsbc_ECLEconomicScenarioDomain_c72b0df9-e1b0-47ff-8096-653a8f0a0e89" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CentralScenarioMember_bf44880f-1162-4afb-82ea-3b7eee927919" xlink:href="hsbc-20260630.xsd#hsbc_CentralScenarioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_c72b0df9-e1b0-47ff-8096-653a8f0a0e89" xlink:to="loc_hsbc_CentralScenarioMember_bf44880f-1162-4afb-82ea-3b7eee927919" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_UpsideScenarioMember_70b11e9a-1c59-417d-bfc5-d00499707e08" xlink:href="hsbc-20260630.xsd#hsbc_UpsideScenarioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_c72b0df9-e1b0-47ff-8096-653a8f0a0e89" xlink:to="loc_hsbc_UpsideScenarioMember_70b11e9a-1c59-417d-bfc5-d00499707e08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DownsideScenarioWorstOutcomeMember_23d9515f-1113-48e1-b183-795a39a45b7a" xlink:href="hsbc-20260630.xsd#hsbc_DownsideScenarioWorstOutcomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_c72b0df9-e1b0-47ff-8096-653a8f0a0e89" xlink:to="loc_hsbc_DownsideScenarioWorstOutcomeMember_23d9515f-1113-48e1-b183-795a39a45b7a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DownsideScenarioAdditionalMember_234b9451-5e77-4a0b-9c7c-b0f773a06c3a" xlink:href="hsbc-20260630.xsd#hsbc_DownsideScenarioAdditionalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_ECLEconomicScenarioDomain_c72b0df9-e1b0-47ff-8096-653a8f0a0e89" xlink:to="loc_hsbc_DownsideScenarioAdditionalMember_234b9451-5e77-4a0b-9c7c-b0f773a06c3a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_459574e2-3bd0-4d5f-ae7a-868026968836" 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_ifrs-full_DisclosureOfFinancialAssetsTable_253d6534-5081-491a-88be-ecb753dcde76" xlink:to="loc_srt_RangeAxis_459574e2-3bd0-4d5f-ae7a-868026968836" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_459574e2-3bd0-4d5f-ae7a-868026968836_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_459574e2-3bd0-4d5f-ae7a-868026968836" xlink:to="loc_srt_RangeMember_459574e2-3bd0-4d5f-ae7a-868026968836_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_12a7b940-03a4-4d53-8bd7-a8720bccfe2d" 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_459574e2-3bd0-4d5f-ae7a-868026968836" xlink:to="loc_srt_RangeMember_12a7b940-03a4-4d53-8bd7-a8720bccfe2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_77c05066-cd19-4042-8c24-18b57333534e" 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_12a7b940-03a4-4d53-8bd7-a8720bccfe2d" xlink:to="loc_srt_MaximumMember_77c05066-cd19-4042-8c24-18b57333534e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_e0a23740-dd7d-4efe-8a84-a2c81711ab0b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_48d44166-e0ab-4f92-8197-04c304e12026" xlink:to="loc_ifrs-full_FinancialAssets_e0a23740-dd7d-4efe-8a84-a2c81711ab0b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesProbability_88133594-d00e-4bad-a8fb-604c02133e0b" xlink:href="hsbc-20260630.xsd#hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesProbability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_48d44166-e0ab-4f92-8197-04c304e12026" xlink:to="loc_hsbc_InputsAssumptionsAndEstimationTechniquesUsedToDetermineExpectedCreditLossesProbability_88133594-d00e-4bad-a8fb-604c02133e0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInFinancialAssets_1f6d785e-e493-4398-ae8b-d3bcd837c290" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseInFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_48d44166-e0ab-4f92-8197-04c304e12026" xlink:to="loc_ifrs-full_IncreaseDecreaseInFinancialAssets_1f6d785e-e493-4398-ae8b-d3bcd837c290" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseInFinancialAssetsIncludedInSensitivityAnalysis_f6c576c9-8296-47d5-9c4c-7a77423b710b" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseInFinancialAssetsIncludedInSensitivityAnalysis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_48d44166-e0ab-4f92-8197-04c304e12026" xlink:to="loc_hsbc_IncreaseDecreaseInFinancialAssetsIncludedInSensitivityAnalysis_f6c576c9-8296-47d5-9c4c-7a77423b710b" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportReconciliationofchangesingrosscarryingnominalamountandallowancesforloansandadvancestobanksandcustomersincludingloancommitmentsandfinancialguaranteesDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportReconciliationofchangesingrosscarryingnominalamountandallowancesforloansandadvancestobanksandcustomersincludingloancommitmentsandfinancialguaranteesDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportReconciliationofchangesingrosscarryingnominalamountandallowancesforloansandadvancestobanksandcustomersincludingloancommitmentsandfinancialguaranteesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_042d6bfa-baf0-44d8-bb7a-d1abf86ab89e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_0282e193-dd9a-4bd3-aa7e-d574048310e4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_042d6bfa-baf0-44d8-bb7a-d1abf86ab89e" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_0282e193-dd9a-4bd3-aa7e-d574048310e4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_70cc95f4-d8fe-4d90-b7df-42b076bcf782" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_0282e193-dd9a-4bd3-aa7e-d574048310e4" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_70cc95f4-d8fe-4d90-b7df-42b076bcf782" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_70cc95f4-d8fe-4d90-b7df-42b076bcf782_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_70cc95f4-d8fe-4d90-b7df-42b076bcf782" xlink:to="loc_ifrs-full_CarryingAmountMember_70cc95f4-d8fe-4d90-b7df-42b076bcf782_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_45027a4e-3093-414f-bde2-5bb87be4b4f4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_70cc95f4-d8fe-4d90-b7df-42b076bcf782" xlink:to="loc_ifrs-full_CarryingAmountMember_45027a4e-3093-414f-bde2-5bb87be4b4f4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_da5713bc-00b1-43b3-bd12-ee4e259853d9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_45027a4e-3093-414f-bde2-5bb87be4b4f4" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_da5713bc-00b1-43b3-bd12-ee4e259853d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedImpairmentMember_9bcc29c1-1b7b-4905-a2aa-f16bac974c2e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedImpairmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_45027a4e-3093-414f-bde2-5bb87be4b4f4" xlink:to="loc_ifrs-full_AccumulatedImpairmentMember_9bcc29c1-1b7b-4905-a2aa-f16bac974c2e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_e21535d5-fce1-4493-8a1b-2b00bafa08aa" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_0282e193-dd9a-4bd3-aa7e-d574048310e4" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_e21535d5-fce1-4493-8a1b-2b00bafa08aa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_e21535d5-fce1-4493-8a1b-2b00bafa08aa_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_e21535d5-fce1-4493-8a1b-2b00bafa08aa" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_e21535d5-fce1-4493-8a1b-2b00bafa08aa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_f29e4610-6995-492d-b14f-0566daf2c37d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_e21535d5-fce1-4493-8a1b-2b00bafa08aa" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_f29e4610-6995-492d-b14f-0566daf2c37d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TwelvemonthExpectedCreditLossesMember_ae492750-6138-4275-9e48-86ce1c97617e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TwelvemonthExpectedCreditLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_f29e4610-6995-492d-b14f-0566daf2c37d" xlink:to="loc_ifrs-full_TwelvemonthExpectedCreditLossesMember_ae492750-6138-4275-9e48-86ce1c97617e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LifetimeExpectedCreditLossesMember_0ae7a6f5-eb91-4e39-a3ee-8a1470aa579a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LifetimeExpectedCreditLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_f29e4610-6995-492d-b14f-0566daf2c37d" xlink:to="loc_ifrs-full_LifetimeExpectedCreditLossesMember_0ae7a6f5-eb91-4e39-a3ee-8a1470aa579a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_ca3efd88-6363-4840-bbc6-e5c1a53ca0bc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_0282e193-dd9a-4bd3-aa7e-d574048310e4" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_ca3efd88-6363-4840-bbc6-e5c1a53ca0bc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_ca3efd88-6363-4840-bbc6-e5c1a53ca0bc_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_ca3efd88-6363-4840-bbc6-e5c1a53ca0bc" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_ca3efd88-6363-4840-bbc6-e5c1a53ca0bc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_0afcede5-89f9-4d3a-8098-b09240cceb48" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_ca3efd88-6363-4840-bbc6-e5c1a53ca0bc" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_0afcede5-89f9-4d3a-8098-b09240cceb48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsNotCreditimpairedMember_0bcb6997-908a-457b-a18d-2d6c7c8441ca" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsNotCreditimpairedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_0afcede5-89f9-4d3a-8098-b09240cceb48" xlink:to="loc_ifrs-full_FinancialInstrumentsNotCreditimpairedMember_0bcb6997-908a-457b-a18d-2d6c7c8441ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsCreditimpairedAfterPurchaseOrOriginationMember_2814ae3f-1204-4e0c-a5c2-a41758b53801" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsCreditimpairedAfterPurchaseOrOriginationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_0afcede5-89f9-4d3a-8098-b09240cceb48" xlink:to="loc_ifrs-full_FinancialInstrumentsCreditimpairedAfterPurchaseOrOriginationMember_2814ae3f-1204-4e0c-a5c2-a41758b53801" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsPurchasedOrOriginatedCreditimpairedMember_d0376220-958a-42e6-a5b7-82e8e8880c81" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsPurchasedOrOriginatedCreditimpairedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_0afcede5-89f9-4d3a-8098-b09240cceb48" xlink:to="loc_ifrs-full_FinancialInstrumentsPurchasedOrOriginatedCreditimpairedMember_d0376220-958a-42e6-a5b7-82e8e8880c81" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NewIFRSsAxis_bc39f4ee-68b3-4779-b55f-ee1bcc699ffa" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NewIFRSsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_0282e193-dd9a-4bd3-aa7e-d574048310e4" xlink:to="loc_ifrs-full_NewIFRSsAxis_bc39f4ee-68b3-4779-b55f-ee1bcc699ffa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NewIFRSsDomain_bc39f4ee-68b3-4779-b55f-ee1bcc699ffa_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NewIFRSsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_NewIFRSsAxis_bc39f4ee-68b3-4779-b55f-ee1bcc699ffa" xlink:to="loc_ifrs-full_NewIFRSsDomain_bc39f4ee-68b3-4779-b55f-ee1bcc699ffa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NewIFRSsDomain_7739ca0f-84a0-414a-a0ba-c9089a0a1536" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NewIFRSsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_NewIFRSsAxis_bc39f4ee-68b3-4779-b55f-ee1bcc699ffa" xlink:to="loc_ifrs-full_NewIFRSsDomain_7739ca0f-84a0-414a-a0ba-c9089a0a1536" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IFRS9Member_2ce540d0-c928-4f01-ae6f-c3f52f8fd30c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IFRS9Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_NewIFRSsDomain_7739ca0f-84a0-414a-a0ba-c9089a0a1536" xlink:to="loc_ifrs-full_IFRS9Member_2ce540d0-c928-4f01-ae6f-c3f52f8fd30c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis_4e2ef117-77ba-44ea-9ad2-4e9bca85a1f1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_0282e193-dd9a-4bd3-aa7e-d574048310e4" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsAxis_4e2ef117-77ba-44ea-9ad2-4e9bca85a1f1" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_4e2ef117-77ba-44ea-9ad2-4e9bca85a1f1_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_4e2ef117-77ba-44ea-9ad2-4e9bca85a1f1" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_4e2ef117-77ba-44ea-9ad2-4e9bca85a1f1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_cb52fdc5-b0e1-425e-b3e9-06aaf6b8a501" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_4e2ef117-77ba-44ea-9ad2-4e9bca85a1f1" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_cb52fdc5-b0e1-425e-b3e9-06aaf6b8a501" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_FinancialInstrumentsIncludingLoanCommitmentsAndFinancialGuaranteesMember_6617afe7-90ee-4b51-856a-812820872d0d" xlink:href="hsbc-20260630.xsd#hsbc_FinancialInstrumentsIncludingLoanCommitmentsAndFinancialGuaranteesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_cb52fdc5-b0e1-425e-b3e9-06aaf6b8a501" xlink:to="loc_hsbc_FinancialInstrumentsIncludingLoanCommitmentsAndFinancialGuaranteesMember_6617afe7-90ee-4b51-856a-812820872d0d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansAndAdvancesToBanksAndCustomersIncludingLoanCommitmentsAndFinancialGuaranteesMember_821c079b-604d-48d3-8d48-2e3aa83e0e81" xlink:href="hsbc-20260630.xsd#hsbc_LoansAndAdvancesToBanksAndCustomersIncludingLoanCommitmentsAndFinancialGuaranteesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_FinancialInstrumentsIncludingLoanCommitmentsAndFinancialGuaranteesMember_6617afe7-90ee-4b51-856a-812820872d0d" xlink:to="loc_hsbc_LoansAndAdvancesToBanksAndCustomersIncludingLoanCommitmentsAndFinancialGuaranteesMember_821c079b-604d-48d3-8d48-2e3aa83e0e81" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_ReverseRepurchaseAgreementNontradingMember_9c2bd7c9-466e-406a-9b98-33675231e57c" xlink:href="hsbc-20260630.xsd#hsbc_ReverseRepurchaseAgreementNontradingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_FinancialInstrumentsIncludingLoanCommitmentsAndFinancialGuaranteesMember_6617afe7-90ee-4b51-856a-812820872d0d" xlink:to="loc_hsbc_ReverseRepurchaseAgreementNontradingMember_9c2bd7c9-466e-406a-9b98-33675231e57c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherFinancialAssetsMember_0fad1eb0-b1db-4fd1-8914-a0f24fe23060" xlink:href="hsbc-20260630.xsd#hsbc_OtherFinancialAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_cb52fdc5-b0e1-425e-b3e9-06aaf6b8a501" xlink:to="loc_hsbc_OtherFinancialAssetsMember_0fad1eb0-b1db-4fd1-8914-a0f24fe23060" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_PerformanceAndOtherGuaranteeContractsMember_8292a115-56e5-470c-985f-b82c7c703866" xlink:href="hsbc-20260630.xsd#hsbc_PerformanceAndOtherGuaranteeContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_cb52fdc5-b0e1-425e-b3e9-06aaf6b8a501" xlink:to="loc_hsbc_PerformanceAndOtherGuaranteeContractsMember_8292a115-56e5-470c-985f-b82c7c703866" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DebtSecuritiesMember_1a1fe7b3-5d37-4824-9a7c-cf03d2d840b8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_cb52fdc5-b0e1-425e-b3e9-06aaf6b8a501" xlink:to="loc_ifrs-full_DebtSecuritiesMember_1a1fe7b3-5d37-4824-9a7c-cf03d2d840b8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansAndAdvancesToCustomersMember_b9aaa434-3a71-4113-a646-0e748f6696e9" xlink:href="hsbc-20260630.xsd#hsbc_LoansAndAdvancesToCustomersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_cb52fdc5-b0e1-425e-b3e9-06aaf6b8a501" xlink:to="loc_hsbc_LoansAndAdvancesToCustomersMember_b9aaa434-3a71-4113-a646-0e748f6696e9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansAndAdvancesToBanksMember_0d284f7c-8e37-40e8-bc1d-68b38c1375e5" xlink:href="hsbc-20260630.xsd#hsbc_LoansAndAdvancesToBanksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_cb52fdc5-b0e1-425e-b3e9-06aaf6b8a501" xlink:to="loc_hsbc_LoansAndAdvancesToBanksMember_0d284f7c-8e37-40e8-bc1d-68b38c1375e5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_02b87285-a01f-45b0-b2eb-903a755ffd95" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_0282e193-dd9a-4bd3-aa7e-d574048310e4" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_02b87285-a01f-45b0-b2eb-903a755ffd95" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_02b87285-a01f-45b0-b2eb-903a755ffd95_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_02b87285-a01f-45b0-b2eb-903a755ffd95" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_02b87285-a01f-45b0-b2eb-903a755ffd95_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_355e7e20-20c0-48bd-92fc-1354bb35d643" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_02b87285-a01f-45b0-b2eb-903a755ffd95" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_355e7e20-20c0-48bd-92fc-1354bb35d643" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_3aebe326-eace-46aa-847e-1316c3b2139d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_355e7e20-20c0-48bd-92fc-1354bb35d643" xlink:to="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_3aebe326-eace-46aa-847e-1316c3b2139d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember_e949f066-4982-4640-b2c2-3a68a35eeb78" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_355e7e20-20c0-48bd-92fc-1354bb35d643" xlink:to="loc_ifrs-full_FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember_e949f066-4982-4640-b2c2-3a68a35eeb78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsAxis_2670971a-cf8b-4cb8-ac82-5f486a889d13" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_0282e193-dd9a-4bd3-aa7e-d574048310e4" xlink:to="loc_ifrs-full_ClassesOfAssetsAxis_2670971a-cf8b-4cb8-ac82-5f486a889d13" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsDomain_2670971a-cf8b-4cb8-ac82-5f486a889d13_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis_2670971a-cf8b-4cb8-ac82-5f486a889d13" xlink:to="loc_ifrs-full_ClassesOfAssetsDomain_2670971a-cf8b-4cb8-ac82-5f486a889d13_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsDomain_e67f7fa4-523b-4905-824d-a4a13ba1c1b8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfAssetsAxis_2670971a-cf8b-4cb8-ac82-5f486a889d13" xlink:to="loc_ifrs-full_ClassesOfAssetsDomain_e67f7fa4-523b-4905-824d-a4a13ba1c1b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssetsHeldForSaleMember_797cf5c3-8384-4386-be7b-d99593c9ef03" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentAssetsHeldForSaleMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_e67f7fa4-523b-4905-824d-a4a13ba1c1b8" xlink:to="loc_ifrs-full_NoncurrentAssetsHeldForSaleMember_797cf5c3-8384-4386-be7b-d99593c9ef03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameAxis_ea71188f-6c8c-4275-aabb-858aa7909576" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_0282e193-dd9a-4bd3-aa7e-d574048310e4" xlink:to="loc_hsbc_DisposalGroupNameAxis_ea71188f-6c8c-4275-aabb-858aa7909576" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameDomain_ea71188f-6c8c-4275-aabb-858aa7909576_default" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_DisposalGroupNameAxis_ea71188f-6c8c-4275-aabb-858aa7909576" xlink:to="loc_hsbc_DisposalGroupNameDomain_ea71188f-6c8c-4275-aabb-858aa7909576_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DisposalGroupNameDomain_921e8e09-57a6-4ea3-b0b6-913185505275" xlink:href="hsbc-20260630.xsd#hsbc_DisposalGroupNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_DisposalGroupNameAxis_ea71188f-6c8c-4275-aabb-858aa7909576" xlink:to="loc_hsbc_DisposalGroupNameDomain_921e8e09-57a6-4ea3-b0b6-913185505275" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_FrenchRetainedHomeAndOtherLoanPortfolioMember_019f4719-0f4a-7b0f-aeb1-755b27f13721" xlink:href="hsbc-20260630.xsd#hsbc_FrenchRetainedHomeAndOtherLoanPortfolioMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_DisposalGroupNameDomain_921e8e09-57a6-4ea3-b0b6-913185505275" xlink:to="loc_hsbc_FrenchRetainedHomeAndOtherLoanPortfolioMember_019f4719-0f4a-7b0f-aeb1-755b27f13721" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersAxis_06757c22-9992-4490-b9b6-32e7254d6639" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_0282e193-dd9a-4bd3-aa7e-d574048310e4" xlink:to="loc_ifrs-full_TypesOfCustomersAxis_06757c22-9992-4490-b9b6-32e7254d6639" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersDomain_06757c22-9992-4490-b9b6-32e7254d6639_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfCustomersAxis_06757c22-9992-4490-b9b6-32e7254d6639" xlink:to="loc_ifrs-full_TypesOfCustomersDomain_06757c22-9992-4490-b9b6-32e7254d6639_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfCustomersDomain_006d048e-8889-47b2-b92a-6552eb504b28" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfCustomersDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfCustomersAxis_06757c22-9992-4490-b9b6-32e7254d6639" xlink:to="loc_ifrs-full_TypesOfCustomersDomain_006d048e-8889-47b2-b92a-6552eb504b28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_WholesaleLendingSectorMember_f6676270-4d3b-4af0-b46d-4a832de7bcf9" xlink:href="hsbc-20260630.xsd#hsbc_WholesaleLendingSectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfCustomersDomain_006d048e-8889-47b2-b92a-6552eb504b28" xlink:to="loc_hsbc_WholesaleLendingSectorMember_f6676270-4d3b-4af0-b46d-4a832de7bcf9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_PersonalLoansSectorMember_f04afa41-2e23-4e51-b455-00f0e3d414fb" xlink:href="hsbc-20260630.xsd#hsbc_PersonalLoansSectorMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfCustomersDomain_006d048e-8889-47b2-b92a-6552eb504b28" xlink:to="loc_hsbc_PersonalLoansSectorMember_f04afa41-2e23-4e51-b455-00f0e3d414fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_042d6bfa-baf0-44d8-bb7a-d1abf86ab89e" xlink:to="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_e80ae8d1-6b7a-4ac5-b3a8-65319fa12d00" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:to="loc_ifrs-full_FinancialAssets_e80ae8d1-6b7a-4ac5-b3a8-65319fa12d00" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersFinancialAssets_b2a9c79b-f2a1-4eeb-912d-157349221cf9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughTransfersFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransfersFinancialAssets_b2a9c79b-f2a1-4eeb-912d-157349221cf9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughTransfersFinancialAssetsTransfersOutOfStage1IntoStage2_dcc13c11-b808-4564-a80d-878368989e47" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughTransfersFinancialAssetsTransfersOutOfStage1IntoStage2"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:to="loc_hsbc_IncreaseDecreaseThroughTransfersFinancialAssetsTransfersOutOfStage1IntoStage2_dcc13c11-b808-4564-a80d-878368989e47" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughTransfersFinancialAssetsTransfersOutOfStage2IntoStage1_3171b698-00e3-4a80-a586-9948eeee9cfb" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughTransfersFinancialAssetsTransfersOutOfStage2IntoStage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:to="loc_hsbc_IncreaseDecreaseThroughTransfersFinancialAssetsTransfersOutOfStage2IntoStage1_3171b698-00e3-4a80-a586-9948eeee9cfb" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughTransfersFinancialAssetsTransferToStage3_2278f876-3f81-4b31-ba7f-1a26de187a78" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughTransfersFinancialAssetsTransferToStage3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:to="loc_hsbc_IncreaseDecreaseThroughTransfersFinancialAssetsTransferToStage3_2278f876-3f81-4b31-ba7f-1a26de187a78" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughTransfersFinancialAssetsTransfersOutFromStage3_4286d53a-bf4a-40d3-8922-30467277245f" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughTransfersFinancialAssetsTransfersOutFromStage3"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:to="loc_hsbc_IncreaseDecreaseThroughTransfersFinancialAssetsTransfersOutFromStage3_4286d53a-bf4a-40d3-8922-30467277245f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughRemeasurementOfExpectedCreditLossesFromTransferOfStagesFinancialAssets_1ed1b651-48aa-4962-8d52-e4711c74bacd" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughRemeasurementOfExpectedCreditLossesFromTransferOfStagesFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:to="loc_hsbc_IncreaseDecreaseThroughRemeasurementOfExpectedCreditLossesFromTransferOfStagesFinancialAssets_1ed1b651-48aa-4962-8d52-e4711c74bacd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughChangesToRiskParametersModificationsNotDerecognisedFinancialAssets_3e770ba7-b43b-43bc-9c0b-81ec8ea659df" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughChangesToRiskParametersModificationsNotDerecognisedFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:to="loc_hsbc_IncreaseDecreaseThroughChangesToRiskParametersModificationsNotDerecognisedFinancialAssets_3e770ba7-b43b-43bc-9c0b-81ec8ea659df" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughOriginationOrPurchaseRepaymentsFinancialAssets_068ea0da-9596-4d6f-bd45-d461398d04bc" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughOriginationOrPurchaseRepaymentsFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:to="loc_hsbc_IncreaseDecreaseThroughOriginationOrPurchaseRepaymentsFinancialAssets_068ea0da-9596-4d6f-bd45-d461398d04bc" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseThroughChangesToRiskParametersCreditQualityFinancialAssets_0cba6f6a-be6e-4a84-b428-1c231044bb9a" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseThroughChangesToRiskParametersCreditQualityFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:to="loc_hsbc_IncreaseDecreaseThroughChangesToRiskParametersCreditQualityFinancialAssets_0cba6f6a-be6e-4a84-b428-1c231044bb9a" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughChangesInModelsOrRiskParametersFinancialAssets_54e10f4b-7da2-425b-a1db-a5183e5b8d38" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughChangesInModelsOrRiskParametersFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughChangesInModelsOrRiskParametersFinancialAssets_54e10f4b-7da2-425b-a1db-a5183e5b8d38" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DecreaseThroughWriteoffFinancialAssets_e4a3265b-6039-4b79-91d2-e8a94037ec30" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DecreaseThroughWriteoffFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:to="loc_ifrs-full_DecreaseThroughWriteoffFinancialAssets_e4a3265b-6039-4b79-91d2-e8a94037ec30" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_DecreaseThroughDerecognitionCreditRelatedModificationsFinancialAssets_d1f56eec-c806-47f5-b37f-351156a34ecf" xlink:href="hsbc-20260630.xsd#hsbc_DecreaseThroughDerecognitionCreditRelatedModificationsFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:to="loc_hsbc_DecreaseThroughDerecognitionCreditRelatedModificationsFinancialAssets_d1f56eec-c806-47f5-b37f-351156a34ecf" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughForeignExchangeAndOtherMovementsFinancialAssets_9edbcf93-b901-45ba-b78f-0acc445874b6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughForeignExchangeAndOtherMovementsFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IncreaseDecreaseInFinancialAssetsAbstract_571b7098-a45e-4651-b80f-3fabf6e305fb" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughForeignExchangeAndOtherMovementsFinancialAssets_9edbcf93-b901-45ba-b78f-0acc445874b6" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_8ad0f69b-b700-45d4-a591-b9e3fcfbbe11" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseInFinancialAssets_c8d608cd-5732-41fc-879b-15ebfd4bb728" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseInFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_042d6bfa-baf0-44d8-bb7a-d1abf86ab89e" xlink:to="loc_ifrs-full_IncreaseDecreaseInFinancialAssets_c8d608cd-5732-41fc-879b-15ebfd4bb728" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReversalOfImpairmentLossRecognisedInProfitOrLoss_019f46f8-3ab1-7cd7-9130-9dfb46a0db38" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReversalOfImpairmentLossRecognisedInProfitOrLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_042d6bfa-baf0-44d8-bb7a-d1abf86ab89e" xlink:to="loc_ifrs-full_ReversalOfImpairmentLossRecognisedInProfitOrLoss_019f46f8-3ab1-7cd7-9130-9dfb46a0db38" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughOtherMovementsFinancialAssets_05b72898-be5f-4d6d-a543-d7690964bc1f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughOtherMovementsFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_042d6bfa-baf0-44d8-bb7a-d1abf86ab89e" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughOtherMovementsFinancialAssets_05b72898-be5f-4d6d-a543-d7690964bc1f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_IncreaseDecreaseInAllowanceForExpectedCreditLosses_019f46f8-3ab1-7d6c-83d5-d701d09bb0aa" xlink:href="hsbc-20260630.xsd#hsbc_IncreaseDecreaseInAllowanceForExpectedCreditLosses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_042d6bfa-baf0-44d8-bb7a-d1abf86ab89e" xlink:to="loc_hsbc_IncreaseDecreaseInAllowanceForExpectedCreditLosses_019f46f8-3ab1-7d6c-83d5-d701d09bb0aa" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportDistributionoffinancialinstrumentstowhichtheimpairmentrequirementsinIFRS9areappliedbycreditqualityandstageallocationDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportDistributionoffinancialinstrumentstowhichtheimpairmentrequirementsinIFRS9areappliedbycreditqualityandstageallocationDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportDistributionoffinancialinstrumentstowhichtheimpairmentrequirementsinIFRS9areappliedbycreditqualityandstageallocationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedLineItems_780d165f-e250-45ca-b21d-b820431a722c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable_4ed58f18-a503-403d-9630-e9374396737f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedLineItems_780d165f-e250-45ca-b21d-b820431a722c" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable_4ed58f18-a503-403d-9630-e9374396737f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_bf8999bb-0ab3-446e-841d-15bcbeb27e22" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable_4ed58f18-a503-403d-9630-e9374396737f" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_bf8999bb-0ab3-446e-841d-15bcbeb27e22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_bf8999bb-0ab3-446e-841d-15bcbeb27e22_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_bf8999bb-0ab3-446e-841d-15bcbeb27e22" xlink:to="loc_ifrs-full_CarryingAmountMember_bf8999bb-0ab3-446e-841d-15bcbeb27e22_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_f639ca05-9346-4e4f-8e64-753bd0802d25" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_bf8999bb-0ab3-446e-841d-15bcbeb27e22" xlink:to="loc_ifrs-full_CarryingAmountMember_f639ca05-9346-4e4f-8e64-753bd0802d25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_3839262a-443f-4556-a22e-5bbe8baa227f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GrossCarryingAmountMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_f639ca05-9346-4e4f-8e64-753bd0802d25" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_3839262a-443f-4556-a22e-5bbe8baa227f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedImpairmentMember_fd02c8f2-e117-4fcb-b6f2-3843e9a7c55c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedImpairmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_f639ca05-9346-4e4f-8e64-753bd0802d25" xlink:to="loc_ifrs-full_AccumulatedImpairmentMember_fd02c8f2-e117-4fcb-b6f2-3843e9a7c55c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InternalCreditGradesAxis_db5edc60-3202-46c8-ab5d-2397808c5ab1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InternalCreditGradesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable_4ed58f18-a503-403d-9630-e9374396737f" xlink:to="loc_ifrs-full_InternalCreditGradesAxis_db5edc60-3202-46c8-ab5d-2397808c5ab1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InternalCreditGradesDomain_db5edc60-3202-46c8-ab5d-2397808c5ab1_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InternalCreditGradesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_InternalCreditGradesAxis_db5edc60-3202-46c8-ab5d-2397808c5ab1" xlink:to="loc_ifrs-full_InternalCreditGradesDomain_db5edc60-3202-46c8-ab5d-2397808c5ab1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InternalCreditGradesDomain_6b8b059b-1791-4ef6-8342-dcfc58c642e1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InternalCreditGradesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_InternalCreditGradesAxis_db5edc60-3202-46c8-ab5d-2397808c5ab1" xlink:to="loc_ifrs-full_InternalCreditGradesDomain_6b8b059b-1791-4ef6-8342-dcfc58c642e1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_StrongMember_eeb432ec-b494-4cf2-bf13-72f502bdb1e9" xlink:href="hsbc-20260630.xsd#hsbc_StrongMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_InternalCreditGradesDomain_6b8b059b-1791-4ef6-8342-dcfc58c642e1" xlink:to="loc_hsbc_StrongMember_eeb432ec-b494-4cf2-bf13-72f502bdb1e9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_GoodMember_78221a77-21f8-4879-940b-3c5b9ea8e260" xlink:href="hsbc-20260630.xsd#hsbc_GoodMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_InternalCreditGradesDomain_6b8b059b-1791-4ef6-8342-dcfc58c642e1" xlink:to="loc_hsbc_GoodMember_78221a77-21f8-4879-940b-3c5b9ea8e260" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_SatisfactoryMember_1395b555-e4ca-4f81-8dff-bd3d7b90c3fd" xlink:href="hsbc-20260630.xsd#hsbc_SatisfactoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_InternalCreditGradesDomain_6b8b059b-1791-4ef6-8342-dcfc58c642e1" xlink:to="loc_hsbc_SatisfactoryMember_1395b555-e4ca-4f81-8dff-bd3d7b90c3fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_Substandard1Member_df9a515a-9973-475a-a4d6-0ad304f6d607" xlink:href="hsbc-20260630.xsd#hsbc_Substandard1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_InternalCreditGradesDomain_6b8b059b-1791-4ef6-8342-dcfc58c642e1" xlink:to="loc_hsbc_Substandard1Member_df9a515a-9973-475a-a4d6-0ad304f6d607" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_CreditImpairedMember_768768b9-0c74-483e-b2f0-728aced0131b" xlink:href="hsbc-20260630.xsd#hsbc_CreditImpairedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_InternalCreditGradesDomain_6b8b059b-1791-4ef6-8342-dcfc58c642e1" xlink:to="loc_hsbc_CreditImpairedMember_768768b9-0c74-483e-b2f0-728aced0131b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_5979e4db-7b95-420f-b654-d956f3a0d2c0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable_4ed58f18-a503-403d-9630-e9374396737f" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_5979e4db-7b95-420f-b654-d956f3a0d2c0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_5979e4db-7b95-420f-b654-d956f3a0d2c0_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_5979e4db-7b95-420f-b654-d956f3a0d2c0" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_5979e4db-7b95-420f-b654-d956f3a0d2c0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_8c65f5f7-2b0d-4929-a9f0-0d7aefb4242c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_5979e4db-7b95-420f-b654-d956f3a0d2c0" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_8c65f5f7-2b0d-4929-a9f0-0d7aefb4242c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_237697d5-f223-40e5-b907-66cdcc1b79a3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_8c65f5f7-2b0d-4929-a9f0-0d7aefb4242c" xlink:to="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_237697d5-f223-40e5-b907-66cdcc1b79a3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember_8aa7ff7e-b5c9-4e4d-a995-00fb433a228c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_8c65f5f7-2b0d-4929-a9f0-0d7aefb4242c" xlink:to="loc_ifrs-full_FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncomeCategoryMember_8aa7ff7e-b5c9-4e4d-a995-00fb433a228c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_5c8804f2-9a64-4124-bceb-8af1ac08a888" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable_4ed58f18-a503-403d-9630-e9374396737f" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_5c8804f2-9a64-4124-bceb-8af1ac08a888" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_5c8804f2-9a64-4124-bceb-8af1ac08a888_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_5c8804f2-9a64-4124-bceb-8af1ac08a888" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_5c8804f2-9a64-4124-bceb-8af1ac08a888_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_833ec527-c792-48d9-922f-dc5cbede47df" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsAxis_5c8804f2-9a64-4124-bceb-8af1ac08a888" xlink:to="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_833ec527-c792-48d9-922f-dc5cbede47df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoanAndOtherCreditRelatedCommitmentsMember_853be2b3-41ce-4a88-8c02-679c921eaafa" xlink:href="hsbc-20260630.xsd#hsbc_LoanAndOtherCreditRelatedCommitmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_833ec527-c792-48d9-922f-dc5cbede47df" xlink:to="loc_hsbc_LoanAndOtherCreditRelatedCommitmentsMember_853be2b3-41ce-4a88-8c02-679c921eaafa" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialGuaranteeContractsMember_481fd4fc-9c5f-4f01-a1e2-26b8844650f3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialGuaranteeContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialInstrumentsDomain_833ec527-c792-48d9-922f-dc5cbede47df" xlink:to="loc_ifrs-full_FinancialGuaranteeContractsMember_481fd4fc-9c5f-4f01-a1e2-26b8844650f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_60371412-e00c-40ed-8a27-e80dcae1a7c8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable_4ed58f18-a503-403d-9630-e9374396737f" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_60371412-e00c-40ed-8a27-e80dcae1a7c8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_60371412-e00c-40ed-8a27-e80dcae1a7c8_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_60371412-e00c-40ed-8a27-e80dcae1a7c8" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_60371412-e00c-40ed-8a27-e80dcae1a7c8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_1404ea40-da28-4318-8915-60b0685316aa" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesAxis_60371412-e00c-40ed-8a27-e80dcae1a7c8" xlink:to="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_1404ea40-da28-4318-8915-60b0685316aa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TwelvemonthExpectedCreditLossesMember_fb2c4597-64f9-44ad-b734-c2ac1ff320fe" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TwelvemonthExpectedCreditLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_1404ea40-da28-4318-8915-60b0685316aa" xlink:to="loc_ifrs-full_TwelvemonthExpectedCreditLossesMember_fb2c4597-64f9-44ad-b734-c2ac1ff320fe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LifetimeExpectedCreditLossesMember_0c1f7c77-a77b-4bd5-a4bc-592048a26f59" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LifetimeExpectedCreditLossesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypeOfMeasurementOfExpectedCreditLossesDomain_1404ea40-da28-4318-8915-60b0685316aa" xlink:to="loc_ifrs-full_LifetimeExpectedCreditLossesMember_0c1f7c77-a77b-4bd5-a4bc-592048a26f59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis_67bbf612-b140-45ef-a50c-567e6709e2a6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable_4ed58f18-a503-403d-9630-e9374396737f" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsAxis_67bbf612-b140-45ef-a50c-567e6709e2a6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_67bbf612-b140-45ef-a50c-567e6709e2a6_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_67bbf612-b140-45ef-a50c-567e6709e2a6" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_67bbf612-b140-45ef-a50c-567e6709e2a6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_fff4a6a8-08c1-48b4-9034-22077da91a73" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfFinancialAssetsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsAxis_67bbf612-b140-45ef-a50c-567e6709e2a6" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_fff4a6a8-08c1-48b4-9034-22077da91a73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansAndAdvancesToCustomersMember_26ca06b4-e9c7-4507-a261-4bbe5be5e69a" xlink:href="hsbc-20260630.xsd#hsbc_LoansAndAdvancesToCustomersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_fff4a6a8-08c1-48b4-9034-22077da91a73" xlink:to="loc_hsbc_LoansAndAdvancesToCustomersMember_26ca06b4-e9c7-4507-a261-4bbe5be5e69a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_LoansAndAdvancesToBanksMember_78afe307-9fe4-4483-96bf-ee6ccb918df4" xlink:href="hsbc-20260630.xsd#hsbc_LoansAndAdvancesToBanksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_fff4a6a8-08c1-48b4-9034-22077da91a73" xlink:to="loc_hsbc_LoansAndAdvancesToBanksMember_78afe307-9fe4-4483-96bf-ee6ccb918df4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OtherFinancialAssetsMember_d9c07a3e-9f80-4f72-8ac1-07863024a222" xlink:href="hsbc-20260630.xsd#hsbc_OtherFinancialAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_fff4a6a8-08c1-48b4-9034-22077da91a73" xlink:to="loc_hsbc_OtherFinancialAssetsMember_d9c07a3e-9f80-4f72-8ac1-07863024a222" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DebtSecuritiesMember_d527e780-fe81-4078-b231-fce65dfb4bde" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DebtSecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_fff4a6a8-08c1-48b4-9034-22077da91a73" xlink:to="loc_ifrs-full_DebtSecuritiesMember_d527e780-fe81-4078-b231-fce65dfb4bde" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_5e1b5027-3a92-496c-9821-486393f254ac" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedTable_4ed58f18-a503-403d-9630-e9374396737f" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_5e1b5027-3a92-496c-9821-486393f254ac" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_5e1b5027-3a92-496c-9821-486393f254ac_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_5e1b5027-3a92-496c-9821-486393f254ac" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_5e1b5027-3a92-496c-9821-486393f254ac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_d5a4dab5-bc67-4d44-b85f-abd904e34e91" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsAxis_5e1b5027-3a92-496c-9821-486393f254ac" xlink:to="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_d5a4dab5-bc67-4d44-b85f-abd904e34e91" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsNotCreditimpairedMember_8c41b293-be6a-478c-bfa5-7380ede058ff" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsNotCreditimpairedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_d5a4dab5-bc67-4d44-b85f-abd904e34e91" xlink:to="loc_ifrs-full_FinancialInstrumentsNotCreditimpairedMember_8c41b293-be6a-478c-bfa5-7380ede058ff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsCreditimpairedAfterPurchaseOrOriginationMember_70d7bed8-042b-416f-bf69-770046c422a8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsCreditimpairedAfterPurchaseOrOriginationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_d5a4dab5-bc67-4d44-b85f-abd904e34e91" xlink:to="loc_ifrs-full_FinancialInstrumentsCreditimpairedAfterPurchaseOrOriginationMember_70d7bed8-042b-416f-bf69-770046c422a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialInstrumentsPurchasedOrOriginatedCreditimpairedMember_c55cd32c-6eff-4cc4-a11d-77bdfdefa74e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialInstrumentsPurchasedOrOriginatedCreditimpairedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CreditImpairmentOfFinancialInstrumentsDomain_d5a4dab5-bc67-4d44-b85f-abd904e34e91" xlink:to="loc_ifrs-full_FinancialInstrumentsPurchasedOrOriginatedCreditimpairedMember_c55cd32c-6eff-4cc4-a11d-77bdfdefa74e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_ecc3eb72-14e7-4d0c-9a18-fb3e237db2e7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedLineItems_780d165f-e250-45ca-b21d-b820431a722c" xlink:to="loc_ifrs-full_FinancialAssets_ecc3eb72-14e7-4d0c-9a18-fb3e237db2e7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_OffbalanceSheetCommitments_6305908c-9180-47d6-9dd1-bb452a84d717" xlink:href="hsbc-20260630.xsd#hsbc_OffbalanceSheetCommitments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedLineItems_780d165f-e250-45ca-b21d-b820431a722c" xlink:to="loc_hsbc_OffbalanceSheetCommitments_6305908c-9180-47d6-9dd1-bb452a84d717" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_FinancialAssetsAndOffbalanceSheetLoanCommitments_c973696d-aa60-4740-b618-147d64515b56" xlink:href="hsbc-20260630.xsd#hsbc_FinancialAssetsAndOffbalanceSheetLoanCommitments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsThatAreEitherPastDueOrImpairedLineItems_780d165f-e250-45ca-b21d-b820431a722c" xlink:to="loc_hsbc_FinancialAssetsAndOffbalanceSheetLoanCommitments_c973696d-aa60-4740-b618-147d64515b56" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportNontradingVaR991dayDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportNontradingVaR991dayDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportNontradingVaR991dayDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_c2841dfd-d074-4fd6-8114-cbe27256fdb5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_76a0e3bd-f996-47ff-a943-2b4324d95220" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_c2841dfd-d074-4fd6-8114-cbe27256fdb5" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_76a0e3bd-f996-47ff-a943-2b4324d95220" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_TypesOfMarketRiskPortfoliosAxis_654ce0ab-7e78-4908-a96a-a749936d10ab" xlink:href="hsbc-20260630.xsd#hsbc_TypesOfMarketRiskPortfoliosAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_76a0e3bd-f996-47ff-a943-2b4324d95220" xlink:to="loc_hsbc_TypesOfMarketRiskPortfoliosAxis_654ce0ab-7e78-4908-a96a-a749936d10ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_TypesOfMarketRiskPortfoliosDomain_654ce0ab-7e78-4908-a96a-a749936d10ab_default" xlink:href="hsbc-20260630.xsd#hsbc_TypesOfMarketRiskPortfoliosDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_TypesOfMarketRiskPortfoliosAxis_654ce0ab-7e78-4908-a96a-a749936d10ab" xlink:to="loc_hsbc_TypesOfMarketRiskPortfoliosDomain_654ce0ab-7e78-4908-a96a-a749936d10ab_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_TypesOfMarketRiskPortfoliosDomain_01b2a293-e169-44d0-81d7-6e3835357370" xlink:href="hsbc-20260630.xsd#hsbc_TypesOfMarketRiskPortfoliosDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_TypesOfMarketRiskPortfoliosAxis_654ce0ab-7e78-4908-a96a-a749936d10ab" xlink:to="loc_hsbc_TypesOfMarketRiskPortfoliosDomain_01b2a293-e169-44d0-81d7-6e3835357370" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_NontradingPortfoliosMember_82de2179-18b7-461e-a74c-3be3a137cd93" xlink:href="hsbc-20260630.xsd#hsbc_NontradingPortfoliosMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_TypesOfMarketRiskPortfoliosDomain_01b2a293-e169-44d0-81d7-6e3835357370" xlink:to="loc_hsbc_NontradingPortfoliosMember_82de2179-18b7-461e-a74c-3be3a137cd93" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis_e32b44eb-1aca-4734-b065-e193889a8483" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_76a0e3bd-f996-47ff-a943-2b4324d95220" xlink:to="loc_ifrs-full_TypesOfRisksAxis_e32b44eb-1aca-4734-b065-e193889a8483" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_e32b44eb-1aca-4734-b065-e193889a8483_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_e32b44eb-1aca-4734-b065-e193889a8483" xlink:to="loc_ifrs-full_TypesOfRisksDomain_e32b44eb-1aca-4734-b065-e193889a8483_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_fd45280d-921b-4dc8-bcd5-b8b443a446e0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_e32b44eb-1aca-4734-b065-e193889a8483" xlink:to="loc_ifrs-full_TypesOfRisksDomain_fd45280d-921b-4dc8-bcd5-b8b443a446e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestRateRiskMember_2f644d0d-3025-430a-a8a9-9ce4eaf320cd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRateRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_fd45280d-921b-4dc8-bcd5-b8b443a446e0" xlink:to="loc_ifrs-full_InterestRateRiskMember_2f644d0d-3025-430a-a8a9-9ce4eaf320cd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditRiskMember_cd25614a-18f1-4fe7-809d-8c4ae33d3e6f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_fd45280d-921b-4dc8-bcd5-b8b443a446e0" xlink:to="loc_ifrs-full_CreditRiskMember_cd25614a-18f1-4fe7-809d-8c4ae33d3e6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RiskDiversificationEffectMember_8525cebf-3077-443a-b293-9b8154309596" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RiskDiversificationEffectMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_fd45280d-921b-4dc8-bcd5-b8b443a446e0" xlink:to="loc_ifrs-full_RiskDiversificationEffectMember_8525cebf-3077-443a-b293-9b8154309596" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeAxis_8b7760ae-b1cd-4a01-a4a2-83d02d1a2430" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_76a0e3bd-f996-47ff-a943-2b4324d95220" xlink:to="loc_ifrs-full_RangeAxis_8b7760ae-b1cd-4a01-a4a2-83d02d1a2430" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_8b7760ae-b1cd-4a01-a4a2-83d02d1a2430_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_8b7760ae-b1cd-4a01-a4a2-83d02d1a2430" xlink:to="loc_ifrs-full_RangeDomain_8b7760ae-b1cd-4a01-a4a2-83d02d1a2430_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_0d81c2b3-4611-44c7-b087-6a6042f3c55b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_8b7760ae-b1cd-4a01-a4a2-83d02d1a2430" xlink:to="loc_ifrs-full_RangeDomain_0d81c2b3-4611-44c7-b087-6a6042f3c55b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageMember_dccaba6b-862b-41ff-b4d3-28d0acbd9a34" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_0d81c2b3-4611-44c7-b087-6a6042f3c55b" xlink:to="loc_ifrs-full_WeightedAverageMember_dccaba6b-862b-41ff-b4d3-28d0acbd9a34" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TopOfRangeMember_2d18f942-95a8-4707-9b09-fffbfe6f3d85" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_0d81c2b3-4611-44c7-b087-6a6042f3c55b" xlink:to="loc_ifrs-full_TopOfRangeMember_2d18f942-95a8-4707-9b09-fffbfe6f3d85" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BottomOfRangeMember_8898ab2b-eccf-42de-9446-0082033991b7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_0d81c2b3-4611-44c7-b087-6a6042f3c55b" xlink:to="loc_ifrs-full_BottomOfRangeMember_8898ab2b-eccf-42de-9446-0082033991b7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ValueAtRisk_2cdc1967-9dd2-4308-b68e-931a97b8242d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ValueAtRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_c2841dfd-d074-4fd6-8114-cbe27256fdb5" xlink:to="loc_ifrs-full_ValueAtRisk_2cdc1967-9dd2-4308-b68e-931a97b8242d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportTradingVaR991dayDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportTradingVaR991dayDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportTradingVaR991dayDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_c222c77e-4993-43f7-a677-b7d5a0c489f8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_d08d22cd-ca66-4b8b-9ec6-6a46b183d4e6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_c222c77e-4993-43f7-a677-b7d5a0c489f8" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_d08d22cd-ca66-4b8b-9ec6-6a46b183d4e6" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_TypesOfMarketRiskPortfoliosAxis_71cf8e4b-091a-4433-928a-7171bfeea693" xlink:href="hsbc-20260630.xsd#hsbc_TypesOfMarketRiskPortfoliosAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_d08d22cd-ca66-4b8b-9ec6-6a46b183d4e6" xlink:to="loc_hsbc_TypesOfMarketRiskPortfoliosAxis_71cf8e4b-091a-4433-928a-7171bfeea693" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_TypesOfMarketRiskPortfoliosDomain_71cf8e4b-091a-4433-928a-7171bfeea693_default" xlink:href="hsbc-20260630.xsd#hsbc_TypesOfMarketRiskPortfoliosDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_TypesOfMarketRiskPortfoliosAxis_71cf8e4b-091a-4433-928a-7171bfeea693" xlink:to="loc_hsbc_TypesOfMarketRiskPortfoliosDomain_71cf8e4b-091a-4433-928a-7171bfeea693_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_TypesOfMarketRiskPortfoliosDomain_2b555af5-7c21-4c4e-9bd4-85e996ef7865" xlink:href="hsbc-20260630.xsd#hsbc_TypesOfMarketRiskPortfoliosDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_TypesOfMarketRiskPortfoliosAxis_71cf8e4b-091a-4433-928a-7171bfeea693" xlink:to="loc_hsbc_TypesOfMarketRiskPortfoliosDomain_2b555af5-7c21-4c4e-9bd4-85e996ef7865" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_TradingPortfoliosMember_af3e092d-945c-4fc9-80a1-90d588e516e2" xlink:href="hsbc-20260630.xsd#hsbc_TradingPortfoliosMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_TypesOfMarketRiskPortfoliosDomain_2b555af5-7c21-4c4e-9bd4-85e996ef7865" xlink:to="loc_hsbc_TradingPortfoliosMember_af3e092d-945c-4fc9-80a1-90d588e516e2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksAxis_d5176500-0f5b-439d-8bc8-71b43f32d4fe" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_d08d22cd-ca66-4b8b-9ec6-6a46b183d4e6" xlink:to="loc_ifrs-full_TypesOfRisksAxis_d5176500-0f5b-439d-8bc8-71b43f32d4fe" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_d5176500-0f5b-439d-8bc8-71b43f32d4fe_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfRisksAxis_d5176500-0f5b-439d-8bc8-71b43f32d4fe" xlink:to="loc_ifrs-full_TypesOfRisksDomain_d5176500-0f5b-439d-8bc8-71b43f32d4fe_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfRisksDomain_09024be5-b5c2-44d0-b3b6-0e315dcbc529" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfRisksDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfRisksAxis_d5176500-0f5b-439d-8bc8-71b43f32d4fe" xlink:to="loc_ifrs-full_TypesOfRisksDomain_09024be5-b5c2-44d0-b3b6-0e315dcbc529" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrencyRiskMember_6a3cbd52-f045-411f-bf27-b3d6ab97df1b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrencyRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_09024be5-b5c2-44d0-b3b6-0e315dcbc529" xlink:to="loc_ifrs-full_CurrencyRiskMember_6a3cbd52-f045-411f-bf27-b3d6ab97df1b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestRateRiskMember_032468f6-b0aa-4109-a3b9-0a39478ff420" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRateRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_09024be5-b5c2-44d0-b3b6-0e315dcbc529" xlink:to="loc_ifrs-full_InterestRateRiskMember_032468f6-b0aa-4109-a3b9-0a39478ff420" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityPriceRiskMember_7966bbdf-0bd1-4765-b667-50a2b4f59159" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityPriceRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_09024be5-b5c2-44d0-b3b6-0e315dcbc529" xlink:to="loc_ifrs-full_EquityPriceRiskMember_7966bbdf-0bd1-4765-b667-50a2b4f59159" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CreditRiskMember_f2334b6a-fd77-4800-a520-f317645dcb41" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CreditRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_09024be5-b5c2-44d0-b3b6-0e315dcbc529" xlink:to="loc_ifrs-full_CreditRiskMember_f2334b6a-fd77-4800-a520-f317645dcb41" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RiskDiversificationEffectMember_fa7855ad-0fee-47ca-a346-468c1b526622" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RiskDiversificationEffectMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfRisksDomain_09024be5-b5c2-44d0-b3b6-0e315dcbc529" xlink:to="loc_ifrs-full_RiskDiversificationEffectMember_fa7855ad-0fee-47ca-a346-468c1b526622" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeAxis_2a45dda2-0bd7-41ac-8f99-c90f22932936" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_d08d22cd-ca66-4b8b-9ec6-6a46b183d4e6" xlink:to="loc_ifrs-full_RangeAxis_2a45dda2-0bd7-41ac-8f99-c90f22932936" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_2a45dda2-0bd7-41ac-8f99-c90f22932936_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_RangeAxis_2a45dda2-0bd7-41ac-8f99-c90f22932936" xlink:to="loc_ifrs-full_RangeDomain_2a45dda2-0bd7-41ac-8f99-c90f22932936_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_c4d49946-3bbc-4bf3-add8-850fdfcb15e8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RangeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_RangeAxis_2a45dda2-0bd7-41ac-8f99-c90f22932936" xlink:to="loc_ifrs-full_RangeDomain_c4d49946-3bbc-4bf3-add8-850fdfcb15e8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageMember_7f65922c-d7e2-40d6-8d28-5bbfc1826baf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_c4d49946-3bbc-4bf3-add8-850fdfcb15e8" xlink:to="loc_ifrs-full_WeightedAverageMember_7f65922c-d7e2-40d6-8d28-5bbfc1826baf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TopOfRangeMember_48450b7f-d2a9-4802-9dc6-9c59d9f62836" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TopOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_c4d49946-3bbc-4bf3-add8-850fdfcb15e8" xlink:to="loc_ifrs-full_TopOfRangeMember_48450b7f-d2a9-4802-9dc6-9c59d9f62836" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BottomOfRangeMember_668dab77-f7cc-4f5f-8c7a-c8207befb414" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BottomOfRangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_RangeDomain_c4d49946-3bbc-4bf3-add8-850fdfcb15e8" xlink:to="loc_ifrs-full_BottomOfRangeMember_668dab77-f7cc-4f5f-8c7a-c8207befb414" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ValueAtRisk_e4f3f750-4330-4ec1-b7ff-9cbbd7ac8653" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ValueAtRisk"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_c222c77e-4993-43f7-a677-b7d5a0c489f8" xlink:to="loc_ifrs-full_ValueAtRisk_e4f3f750-4330-4ec1-b7ff-9cbbd7ac8653" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportBalancesheetofinsurancemanufacturingsubsidiariesbytypeofcontractDetails" xlink:type="simple" xlink:href="hsbc-20260630.xsd#ReportofthedirectorsfinancialreviewriskreportBalancesheetofinsurancemanufacturingsubsidiariesbytypeofcontractDetails"/>
  <link:definitionLink xlink:role="http://hsbc.com/role/ReportofthedirectorsfinancialreviewriskreportBalancesheetofinsurancemanufacturingsubsidiariesbytypeofcontractDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsTable_af56560e-51bc-44d3-874b-8c3a866abcfe" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfFinancialAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_af56560e-51bc-44d3-874b-8c3a866abcfe" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BalanceSheetComponentsAxis_ae9219b1-675c-4251-8891-f39b18d7142a" xlink:href="hsbc-20260630.xsd#hsbc_BalanceSheetComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_af56560e-51bc-44d3-874b-8c3a866abcfe" xlink:to="loc_hsbc_BalanceSheetComponentsAxis_ae9219b1-675c-4251-8891-f39b18d7142a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BalanceSheetComponentsDomain_ae9219b1-675c-4251-8891-f39b18d7142a_default" xlink:href="hsbc-20260630.xsd#hsbc_BalanceSheetComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_hsbc_BalanceSheetComponentsAxis_ae9219b1-675c-4251-8891-f39b18d7142a" xlink:to="loc_hsbc_BalanceSheetComponentsDomain_ae9219b1-675c-4251-8891-f39b18d7142a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_BalanceSheetComponentsDomain_4754b521-7556-424f-8b81-2ec880faa3b8" xlink:href="hsbc-20260630.xsd#hsbc_BalanceSheetComponentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_hsbc_BalanceSheetComponentsAxis_ae9219b1-675c-4251-8891-f39b18d7142a" xlink:to="loc_hsbc_BalanceSheetComponentsDomain_4754b521-7556-424f-8b81-2ec880faa3b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_AssetsAndLiabilitiesRelatedToInsuranceContractsMember_cad58c93-08df-401f-b1c4-f2f5322de5b2" xlink:href="hsbc-20260630.xsd#hsbc_AssetsAndLiabilitiesRelatedToInsuranceContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_BalanceSheetComponentsDomain_4754b521-7556-424f-8b81-2ec880faa3b8" xlink:to="loc_hsbc_AssetsAndLiabilitiesRelatedToInsuranceContractsMember_cad58c93-08df-401f-b1c4-f2f5322de5b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_AssetsAndLiabilitiesExcludingInsuranceContractsMember_84b02c96-2fe2-4fd1-9b12-1a1ac369312b" xlink:href="hsbc-20260630.xsd#hsbc_AssetsAndLiabilitiesExcludingInsuranceContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_hsbc_BalanceSheetComponentsDomain_4754b521-7556-424f-8b81-2ec880faa3b8" xlink:to="loc_hsbc_AssetsAndLiabilitiesExcludingInsuranceContractsMember_84b02c96-2fe2-4fd1-9b12-1a1ac369312b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_df1ce3f4-f539-4683-b250-db2db04c3d09" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_af56560e-51bc-44d3-874b-8c3a866abcfe" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_df1ce3f4-f539-4683-b250-db2db04c3d09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_df1ce3f4-f539-4683-b250-db2db04c3d09_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_df1ce3f4-f539-4683-b250-db2db04c3d09" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_df1ce3f4-f539-4683-b250-db2db04c3d09_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_cf37b20a-001d-42ed-ac0a-e643d62fa12b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SignificantInvestmentsInSubsidiariesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_df1ce3f4-f539-4683-b250-db2db04c3d09" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_cf37b20a-001d-42ed-ac0a-e643d62fa12b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InsuranceManufacturingSubsidiariesMember_828a691c-f37c-4221-a0f2-336f6ac29b76" xlink:href="hsbc-20260630.xsd#hsbc_InsuranceManufacturingSubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_cf37b20a-001d-42ed-ac0a-e643d62fa12b" xlink:to="loc_hsbc_InsuranceManufacturingSubsidiariesMember_828a691c-f37c-4221-a0f2-336f6ac29b76" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisaggregationOfInsuranceContractsAxis_019f471a-4ef3-7484-9d07-d3b869d458e9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisaggregationOfInsuranceContractsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsTable_af56560e-51bc-44d3-874b-8c3a866abcfe" xlink:to="loc_ifrs-full_DisaggregationOfInsuranceContractsAxis_019f471a-4ef3-7484-9d07-d3b869d458e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisaggregationOfInsuranceContractsDomain_019f471a-4ef3-7484-9d07-d3b869d458e9_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisaggregationOfInsuranceContractsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_DisaggregationOfInsuranceContractsAxis_019f471a-4ef3-7484-9d07-d3b869d458e9" xlink:to="loc_ifrs-full_DisaggregationOfInsuranceContractsDomain_019f471a-4ef3-7484-9d07-d3b869d458e9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisaggregationOfInsuranceContractsDomain_019f471a-4ef3-7fde-896a-2421b65e6118" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisaggregationOfInsuranceContractsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_DisaggregationOfInsuranceContractsAxis_019f471a-4ef3-7484-9d07-d3b869d458e9" xlink:to="loc_ifrs-full_DisaggregationOfInsuranceContractsDomain_019f471a-4ef3-7fde-896a-2421b65e6118" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InsuranceContractsLifeDirectParticipatingAndInvestmentDPFContractsMember_019f471a-4ef3-7b87-b33c-27f3bebd5cf0" xlink:href="hsbc-20260630.xsd#hsbc_InsuranceContractsLifeDirectParticipatingAndInvestmentDPFContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisaggregationOfInsuranceContractsDomain_019f471a-4ef3-7fde-896a-2421b65e6118" xlink:to="loc_hsbc_InsuranceContractsLifeDirectParticipatingAndInvestmentDPFContractsMember_019f471a-4ef3-7b87-b33c-27f3bebd5cf0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InsuranceContractsLifeOtherContractsMember_019f471a-4ef3-73a4-b0cb-30f23b152511" xlink:href="hsbc-20260630.xsd#hsbc_InsuranceContractsLifeOtherContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisaggregationOfInsuranceContractsDomain_019f471a-4ef3-7fde-896a-2421b65e6118" xlink:to="loc_hsbc_InsuranceContractsLifeOtherContractsMember_019f471a-4ef3-73a4-b0cb-30f23b152511" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InsuranceContractsOtherInsuranceContractsMember_019f471a-4ef3-727f-9f06-7cc030e9d3ae" xlink:href="hsbc-20260630.xsd#hsbc_InsuranceContractsOtherInsuranceContractsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisaggregationOfInsuranceContractsDomain_019f471a-4ef3-7fde-896a-2421b65e6118" xlink:to="loc_hsbc_InsuranceContractsOtherInsuranceContractsMember_019f471a-4ef3-727f-9f06-7cc030e9d3ae" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_f5e6e30a-9b71-4cd8-9b2e-999ff8e8b585" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_FinancialAssets_f5e6e30a-9b71-4cd8-9b2e-999ff8e8b585" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition_94061298-350c-4bfe-892c-7159ee9ffbe7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossDesignatedAsUponInitialRecognition_94061298-350c-4bfe-892c-7159ee9ffbe7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativeFinancialAssets_cfa1103a-0ab3-45dc-a2fb-2aa3ec2f47a2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DerivativeFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_DerivativeFinancialAssets_cfa1103a-0ab3-45dc-a2fb-2aa3ec2f47a2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtAmortisedCost_9617dd3c-54ba-4ebd-a71c-f6653e45061c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtAmortisedCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_FinancialAssetsAtAmortisedCost_9617dd3c-54ba-4ebd-a71c-f6653e45061c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome_3458819a-5e60-4c97-a52a-f85e225bfeea" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_FinancialAssetsMeasuredAtFairValueThroughOtherComprehensiveIncome_3458819a-5e60-4c97-a52a-f85e225bfeea" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherFinancialAssets_ce03276b-8a12-47e2-a25e-66ac953485e6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherFinancialAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_OtherFinancialAssets_ce03276b-8a12-47e2-a25e-66ac953485e6" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InsuranceContractsIssuedThatAreAssets_12747929-b7cf-441b-b77b-1fba68191f8d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InsuranceContractsIssuedThatAreAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_InsuranceContractsIssuedThatAreAssets_12747929-b7cf-441b-b77b-1fba68191f8d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReinsuranceContractsHeldThatAreAssets_26951523-3477-404f-9916-676fdd47c028" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReinsuranceContractsHeldThatAreAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_ReinsuranceContractsHeldThatAreAssets_26951523-3477-404f-9916-676fdd47c028" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale_019f470d-4d6b-7a44-973e-c4026312a23c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_NoncurrentAssetsOrDisposalGroupsClassifiedAsHeldForSale_019f470d-4d6b-7a44-973e-c4026312a23c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherAssets_6af92b38-42b8-4093-b752-8daa560b63b3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_OtherAssets_6af92b38-42b8-4093-b752-8daa560b63b3" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets_0cfe22dd-44a8-4b73-9a5a-25215da2cd5b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_Assets_0cfe22dd-44a8-4b73-9a5a-25215da2cd5b" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_hsbc_InvestmentContractsLiabilitiesAtFairValue_004eb0af-12a9-445a-82e3-efea9bc43df4" xlink:href="hsbc-20260630.xsd#hsbc_InvestmentContractsLiabilitiesAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_hsbc_InvestmentContractsLiabilitiesAtFairValue_004eb0af-12a9-445a-82e3-efea9bc43df4" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InsuranceContractsIssuedThatAreLiabilities_019f471c-7b54-7ef6-b7e6-f6839edf58ac" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InsuranceContractsIssuedThatAreLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_InsuranceContractsIssuedThatAreLiabilities_019f471c-7b54-7ef6-b7e6-f6839edf58ac" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReinsuranceContractsHeldThatAreLiabilities_5c4d4e9a-f83b-4e1e-80ba-edc6f63eb97b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReinsuranceContractsHeldThatAreLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_ReinsuranceContractsHeldThatAreLiabilities_5c4d4e9a-f83b-4e1e-80ba-edc6f63eb97b" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale_019f471a-4ef3-7b82-a230-fd3591e5a8bd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_LiabilitiesIncludedInDisposalGroupsClassifiedAsHeldForSale_019f471a-4ef3-7b82-a230-fd3591e5a8bd" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherLiabilities_ebf3e17c-78a1-4515-86e9-54f370ddee9c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_OtherLiabilities_ebf3e17c-78a1-4515-86e9-54f370ddee9c" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Liabilities_1ba73736-9faa-4b71-a215-be22cb12871f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_Liabilities_1ba73736-9faa-4b71-a215-be22cb12871f" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_1e271afb-ad24-4c36-bbf5-e3ef43026209" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_Equity_1e271afb-ad24-4c36-bbf5-e3ef43026209" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_EquityAndLiabilities_98cb8632-78f7-4185-9ae3-9a04c410cebd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_EquityAndLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_58f462b3-fb8e-45eb-ba61-f339951717b5" xlink:to="loc_ifrs-full_EquityAndLiabilities_98cb8632-78f7-4185-9ae3-9a04c410cebd" xlink:type="arc" order="18"/>
  </link:definitionLink>
</link:linkbase>
