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

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:019e223a-e8d1-7e70-af7d-c7247d0d234a,g:67cc362e-a480-43eb-86a4-7b1480a0c2c5-->
<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://bip.brookfield.com/role/UNAUDITEDINTERIMCONDENSEDANDCONSOLIDATEDSTATEMENTSOFPARTNERSHIPCAPITAL" xlink:type="simple" xlink:href="bip-20260630.xsd#UNAUDITEDINTERIMCONDENSEDANDCONSOLIDATEDSTATEMENTSOFPARTNERSHIPCAPITAL"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/UNAUDITEDINTERIMCONDENSEDANDCONSOLIDATEDSTATEMENTSOFPARTNERSHIPCAPITAL" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfChangesInEquityLineItems_019e223a-ed78-7d84-b338-667873bb650c" 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_019e223a-ed78-7989-b476-54883d3fb54c" 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_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_ifrs-full_StatementOfChangesInEquityTable_019e223a-ed78-7989-b476-54883d3fb54c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Axis_019e223a-ed78-7cc2-a1e9-695adf6e71ed" xlink:href="bip-20260630.xsd#bip_PartnerType1Axis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_StatementOfChangesInEquityTable_019e223a-ed78-7989-b476-54883d3fb54c" xlink:to="loc_bip_PartnerType1Axis_019e223a-ed78-7cc2-a1e9-695adf6e71ed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Domain_019e223a-ed78-7cc2-a1e9-695adf6e71ed_default" xlink:href="bip-20260630.xsd#bip_PartnerType1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_bip_PartnerType1Axis_019e223a-ed78-7cc2-a1e9-695adf6e71ed" xlink:to="loc_bip_PartnerType1Domain_019e223a-ed78-7cc2-a1e9-695adf6e71ed_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Domain_019e223a-ed78-7fb0-91b0-abfa1730086b" xlink:href="bip-20260630.xsd#bip_PartnerType1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_bip_PartnerType1Axis_019e223a-ed78-7cc2-a1e9-695adf6e71ed" xlink:to="loc_bip_PartnerType1Domain_019e223a-ed78-7fb0-91b0-abfa1730086b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_LimitedPartner1Member_019e223a-ed78-7030-a58e-6cee8c972282" xlink:href="bip-20260630.xsd#bip_LimitedPartner1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e223a-ed78-7fb0-91b0-abfa1730086b" xlink:to="loc_bip_LimitedPartner1Member_019e223a-ed78-7030-a58e-6cee8c972282" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_GeneralPartner1Member_019e223a-ed78-7568-9dc8-56cdf11f054b" xlink:href="bip-20260630.xsd#bip_GeneralPartner1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e223a-ed78-7fb0-91b0-abfa1730086b" xlink:to="loc_bip_GeneralPartner1Member_019e223a-ed78-7568-9dc8-56cdf11f054b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonControllingInterestRedeemablePartnershipUnitsMember_019e223a-ed78-759a-b20c-c160fd3dcc9a" xlink:href="bip-20260630.xsd#bip_NonControllingInterestRedeemablePartnershipUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e223a-ed78-7fb0-91b0-abfa1730086b" xlink:to="loc_bip_NonControllingInterestRedeemablePartnershipUnitsMember_019e223a-ed78-759a-b20c-c160fd3dcc9a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonControllingInterestBIPCExchangeableSharesAndClassA.2ExchangeableSharesMember_019e223a-ed78-758c-b10e-a463b475cade" xlink:href="bip-20260630.xsd#bip_NonControllingInterestBIPCExchangeableSharesAndClassA.2ExchangeableSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e223a-ed78-7fb0-91b0-abfa1730086b" xlink:to="loc_bip_NonControllingInterestBIPCExchangeableSharesAndClassA.2ExchangeableSharesMember_019e223a-ed78-758c-b10e-a463b475cade" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonControllingInterestExchangeableUnitsMember_019e223a-ed78-7213-993e-c2c2535a5154" xlink:href="bip-20260630.xsd#bip_NonControllingInterestExchangeableUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e223a-ed78-7fb0-91b0-abfa1730086b" xlink:to="loc_bip_NonControllingInterestExchangeableUnitsMember_019e223a-ed78-7213-993e-c2c2535a5154" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NoncontrollingInterestInOperatingSubsidiariesMember_019e223a-ed78-7d9c-9c6b-f416ead82934" xlink:href="bip-20260630.xsd#bip_NoncontrollingInterestInOperatingSubsidiariesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e223a-ed78-7fb0-91b0-abfa1730086b" xlink:to="loc_bip_NoncontrollingInterestInOperatingSubsidiariesMember_019e223a-ed78-7d9c-9c6b-f416ead82934" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonControllingInterestPerpetualSubordinatedNotesMember_019e223a-ed78-7fc2-bba3-9ed0e05d6d04" xlink:href="bip-20260630.xsd#bip_NonControllingInterestPerpetualSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e223a-ed78-7fb0-91b0-abfa1730086b" xlink:to="loc_bip_NonControllingInterestPerpetualSubordinatedNotesMember_019e223a-ed78-7fc2-bba3-9ed0e05d6d04" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PreferredUnitholdersCapitalMember_019e223a-ed78-78e3-a4d7-1dd6117c14f0" xlink:href="bip-20260630.xsd#bip_PreferredUnitholdersCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e223a-ed78-7fb0-91b0-abfa1730086b" xlink:to="loc_bip_PreferredUnitholdersCapitalMember_019e223a-ed78-78e3-a4d7-1dd6117c14f0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_019e223a-ed78-775d-a8b1-2e10b81c90bf" 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_019e223a-ed78-7989-b476-54883d3fb54c" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_019e223a-ed78-775d-a8b1-2e10b81c90bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019e223a-ed78-775d-a8b1-2e10b81c90bf_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_019e223a-ed78-775d-a8b1-2e10b81c90bf" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019e223a-ed78-775d-a8b1-2e10b81c90bf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019e223a-ed78-728d-99b3-55f538445f6f" 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_019e223a-ed78-775d-a8b1-2e10b81c90bf" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019e223a-ed78-728d-99b3-55f538445f6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_LimitedPartnersCapitalMember_019e223a-ed78-769c-99d4-a823f68912b4" xlink:href="bip-20260630.xsd#bip_LimitedPartnersCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019e223a-ed78-728d-99b3-55f538445f6f" xlink:to="loc_bip_LimitedPartnersCapitalMember_019e223a-ed78-769c-99d4-a823f68912b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RetainedEarningsMember_019e223a-ed78-77ef-97cf-51143fc40079" 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_ComponentsOfEquityDomain_019e223a-ed78-728d-99b3-55f538445f6f" xlink:to="loc_ifrs-full_RetainedEarningsMember_019e223a-ed78-77ef-97cf-51143fc40079" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_OwnershipChangesMember_019e223a-ed78-7699-bf6a-e2728858c88d" xlink:href="bip-20260630.xsd#bip_OwnershipChangesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019e223a-ed78-728d-99b3-55f538445f6f" xlink:to="loc_bip_OwnershipChangesMember_019e223a-ed78-7699-bf6a-e2728858c88d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_019e223a-ed78-797d-93bc-0905d974c9f7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019e223a-ed78-728d-99b3-55f538445f6f" xlink:to="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_019e223a-ed78-797d-93bc-0905d974c9f7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_019e223a-ed78-7ffc-92d0-da6d0dc63671" 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_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_ifrs-full_Equity_019e223a-ed78-7ffc-92d0-da6d0dc63671" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PerpetualSubordinatedNotes_019e223a-ed78-7e81-a538-d72a9dcefb76" xlink:href="bip-20260630.xsd#bip_PerpetualSubordinatedNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_bip_PerpetualSubordinatedNotes_019e223a-ed78-7e81-a538-d72a9dcefb76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss_019e223a-ed78-72c9-9668-672ad2bbd53e" 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_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_ifrs-full_ProfitLoss_019e223a-ed78-72c9-9668-672ad2bbd53e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncome_019e223a-ed78-760b-a0b4-dd5265882f14" 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_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_ifrs-full_OtherComprehensiveIncome_019e223a-ed78-760b-a0b4-dd5265882f14" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComprehensiveIncome_019e223a-ed78-7194-9d49-bdd9a88d4a8a" 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_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_ifrs-full_ComprehensiveIncome_019e223a-ed78-7194-9d49-bdd9a88d4a8a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssueOfEquity_019e223a-ed78-7cce-87da-4f3e24c52870" 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_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_ifrs-full_IssueOfEquity_019e223a-ed78-7cce-87da-4f3e24c52870" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_RepurchaseOfEquity_019e223a-ed78-7127-8f6a-7df79a7beef5" xlink:href="bip-20260630.xsd#bip_RepurchaseOfEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_bip_RepurchaseOfEquity_019e223a-ed78-7127-8f6a-7df79a7beef5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaid_019e223a-ed78-7feb-9131-ec42610afb78" 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_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_ifrs-full_DividendsPaid_019e223a-ed78-7feb-9131-ec42610afb78" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DividendsPreferredStockCash1_019e223a-ed78-70e7-b8a4-ffd9f121a879" xlink:href="bip-20260630.xsd#bip_DividendsPreferredStockCash1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_bip_DividendsPreferredStockCash1_019e223a-ed78-70e7-b8a4-ffd9f121a879" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary_019e223a-ed78-7564-99a8-562e857efe75" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughAcquisitionOfSubsidiary_019e223a-ed78-7564-99a8-562e857efe75" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_CapitalProvidedToNonControllingInterest_019e223a-ed78-7ef5-82b6-2d23729100c3" xlink:href="bip-20260630.xsd#bip_CapitalProvidedToNonControllingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_bip_CapitalProvidedToNonControllingInterest_019e223a-ed78-7ef5-82b6-2d23729100c3" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DecreaseFromSubsidiaryDistributionsToNoncontrollingInterest_019e223a-ed78-71ad-bacf-de4a9d09d25d" xlink:href="bip-20260630.xsd#bip_DecreaseFromSubsidiaryDistributionsToNoncontrollingInterest"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_bip_DecreaseFromSubsidiaryDistributionsToNoncontrollingInterest_019e223a-ed78-71ad-bacf-de4a9d09d25d" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PreferredUnitsRedeemed_019e223a-ed78-7cec-b41e-179f7970ab0e" xlink:href="bip-20260630.xsd#bip_PreferredUnitsRedeemed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfChangesInEquityLineItems_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_bip_PreferredUnitsRedeemed_019e223a-ed78-7cec-b41e-179f7970ab0e" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_019e223a-ed78-7dd9-87b9-c33f6b2f2929" 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_019e223a-ed78-7d84-b338-667873bb650c" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_019e223a-ed78-7dd9-87b9-c33f6b2f2929" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_019e223a-ed78-7581-8767-109dba0eca20" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PerpetualSubordinatedNotes_019e223a-ed78-7b9d-9504-e5adb9d4c0fd" xlink:href="bip-20260630.xsd#bip_PerpetualSubordinatedNotes"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/UNAUDITEDINTERIMCONDENSEDANDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical" xlink:type="simple" xlink:href="bip-20260630.xsd#UNAUDITEDINTERIMCONDENSEDANDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/UNAUDITEDINTERIMCONDENSEDANDCONSOLIDATEDSTATEMENTSOFCASHFLOWSParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedCashFlowStatementsCaptionsLineItems_019e223a-ed78-7bcf-84ca-c95205926ad3" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CondensedCashFlowStatementsCaptionsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CondensedCashFlowStatementTable_019e223a-ed78-76af-a88b-c5ce19a3075f" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_CondensedCashFlowStatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_srt_CondensedCashFlowStatementsCaptionsLineItems_019e223a-ed78-7bcf-84ca-c95205926ad3" xlink:to="loc_srt_CondensedCashFlowStatementTable_019e223a-ed78-76af-a88b-c5ce19a3075f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-7495-8338-242f35514cd1" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_srt_CondensedCashFlowStatementTable_019e223a-ed78-76af-a88b-c5ce19a3075f" xlink:to="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-7495-8338-242f35514cd1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7495-8338-242f35514cd1_default" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-7495-8338-242f35514cd1" xlink:to="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7495-8338-242f35514cd1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7701-96e4-b1ade91aaf4c" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-7495-8338-242f35514cd1" xlink:to="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7701-96e4-b1ade91aaf4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PeruvianTollRoadsMember_019e223a-ed78-7130-bb46-8cdddd61803f" xlink:href="bip-20260630.xsd#bip_PeruvianTollRoadsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7701-96e4-b1ade91aaf4c" xlink:to="loc_bip_PeruvianTollRoadsMember_019e223a-ed78-7130-bb46-8cdddd61803f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities_019e223a-ed78-70e3-ab50-61f068382e05" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CondensedCashFlowStatementsCaptionsLineItems_019e223a-ed78-7bcf-84ca-c95205926ad3" xlink:to="loc_ifrs-full_OtherInflowsOutflowsOfCashClassifiedAsInvestingActivities_019e223a-ed78-70e3-ab50-61f068382e05" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/SEGMENTINFORMATIONOperatingSegmentsDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#SEGMENTINFORMATIONOperatingSegmentsDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/SEGMENTINFORMATIONOperatingSegmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-73e6-8115-eea3b4c0b19e" 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_019e223a-ed78-7a24-adb4-27ae641ebabd" 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_019e223a-ed78-73e6-8115-eea3b4c0b19e" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_019e223a-ed78-7a24-adb4-27ae641ebabd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsAxis_019e223a-ed78-70e8-af4e-466e8b8d3eaf" 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_019e223a-ed78-7a24-adb4-27ae641ebabd" xlink:to="loc_ifrs-full_SegmentConsolidationItemsAxis_019e223a-ed78-70e8-af4e-466e8b8d3eaf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsDomain_019e223a-ed78-70e8-af4e-466e8b8d3eaf_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_019e223a-ed78-70e8-af4e-466e8b8d3eaf" xlink:to="loc_ifrs-full_SegmentConsolidationItemsDomain_019e223a-ed78-70e8-af4e-466e8b8d3eaf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsDomain_019e223a-ed78-784d-9152-b6cfee30b97d" 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_019e223a-ed78-70e8-af4e-466e8b8d3eaf" xlink:to="loc_ifrs-full_SegmentConsolidationItemsDomain_019e223a-ed78-784d-9152-b6cfee30b97d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OperatingSegmentsMember_019e223a-ed78-7212-af14-f2999dacd8cb" 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_019e223a-ed78-784d-9152-b6cfee30b97d" xlink:to="loc_ifrs-full_OperatingSegmentsMember_019e223a-ed78-7212-af14-f2999dacd8cb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaterialReconcilingItemsMember_019e223a-ed78-7948-b069-b5fe6e34ccda" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaterialReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentConsolidationItemsDomain_019e223a-ed78-784d-9152-b6cfee30b97d" xlink:to="loc_ifrs-full_MaterialReconcilingItemsMember_019e223a-ed78-7948-b069-b5fe6e34ccda" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsAxis_019e223a-ed78-79b4-8dff-f14ddc141379" 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_019e223a-ed78-7a24-adb4-27ae641ebabd" xlink:to="loc_ifrs-full_SegmentsAxis_019e223a-ed78-79b4-8dff-f14ddc141379" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_019e223a-ed78-79b4-8dff-f14ddc141379_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_019e223a-ed78-79b4-8dff-f14ddc141379" xlink:to="loc_ifrs-full_SegmentsDomain_019e223a-ed78-79b4-8dff-f14ddc141379_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_019e223a-ed78-77ec-aea2-a5e724a6d1fe" 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_019e223a-ed78-79b4-8dff-f14ddc141379" xlink:to="loc_ifrs-full_SegmentsDomain_019e223a-ed78-77ec-aea2-a5e724a6d1fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_UtilitiesMember_019e223a-ed78-7887-99d3-2743a6ee43d1" xlink:href="bip-20260630.xsd#bip_UtilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ed78-77ec-aea2-a5e724a6d1fe" xlink:to="loc_bip_UtilitiesMember_019e223a-ed78-7887-99d3-2743a6ee43d1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_TransportMember_019e223a-ed78-772f-8e08-f93b67e643fe" xlink:href="bip-20260630.xsd#bip_TransportMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ed78-77ec-aea2-a5e724a6d1fe" xlink:to="loc_bip_TransportMember_019e223a-ed78-772f-8e08-f93b67e643fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MidstreamMember_019e223a-ed78-7e71-9561-c2549451d170" xlink:href="bip-20260630.xsd#bip_MidstreamMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ed78-77ec-aea2-a5e724a6d1fe" xlink:to="loc_bip_MidstreamMember_019e223a-ed78-7e71-9561-c2549451d170" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DataMember_019e7282-da21-7286-8816-840057417481" xlink:href="bip-20260630.xsd#bip_DataMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ed78-77ec-aea2-a5e724a6d1fe" xlink:to="loc_bip_DataMember_019e7282-da21-7286-8816-840057417481" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_Corporate1Member_019e223a-ed78-7caa-88f0-59ad2e3515aa" xlink:href="bip-20260630.xsd#bip_Corporate1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ed78-77ec-aea2-a5e724a6d1fe" xlink:to="loc_bip_Corporate1Member_019e223a-ed78-7caa-88f0-59ad2e3515aa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e223a-ed78-7bde-8172-5590f9399321" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_019e223a-ed78-7a24-adb4-27ae641ebabd" xlink:to="loc_srt_ConsolidationItemsAxis_019e223a-ed78-7bde-8172-5590f9399321" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e223a-ed78-7bde-8172-5590f9399321_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019e223a-ed78-7bde-8172-5590f9399321" xlink:to="loc_srt_ConsolidationItemsDomain_019e223a-ed78-7bde-8172-5590f9399321_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e223a-ed78-77b8-bdc8-a4f8fd2ff143" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019e223a-ed78-7bde-8172-5590f9399321" xlink:to="loc_srt_ConsolidationItemsDomain_019e223a-ed78-77b8-bdc8-a4f8fd2ff143" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssociatesMember_019e223a-ed78-7b4c-ac2f-e76cee2a9bc8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssociatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e223a-ed78-77b8-bdc8-a4f8fd2ff143" xlink:to="loc_ifrs-full_AssociatesMember_019e223a-ed78-7b4c-ac2f-e76cee2a9bc8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncontrollingInterestsMember_019e223a-ed78-73a1-af02-879614f6bc21" 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_srt_ConsolidationItemsDomain_019e223a-ed78-77b8-bdc8-a4f8fd2ff143" xlink:to="loc_ifrs-full_NoncontrollingInterestsMember_019e223a-ed78-73a1-af02-879614f6bc21" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue_019e223a-ed78-73be-9f70-32b25fe1c930" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Revenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-73e6-8115-eea3b4c0b19e" xlink:to="loc_ifrs-full_Revenue_019e223a-ed78-73be-9f70-32b25fe1c930" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_CostOfSalesExcludingDepreciationAndAmortization_019e223a-ed78-7c81-acba-26e95d60a9b0" xlink:href="bip-20260630.xsd#bip_CostOfSalesExcludingDepreciationAndAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-73e6-8115-eea3b4c0b19e" xlink:to="loc_bip_CostOfSalesExcludingDepreciationAndAmortization_019e223a-ed78-7c81-acba-26e95d60a9b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SellingGeneralAndAdministrativeExpense_019e223a-ed78-7347-a06e-0c0b15bd987a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SellingGeneralAndAdministrativeExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-73e6-8115-eea3b4c0b19e" xlink:to="loc_ifrs-full_SellingGeneralAndAdministrativeExpense_019e223a-ed78-7347-a06e-0c0b15bd987a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_Othercashoperatingincomeexpense_019e223a-ed78-7e96-bc50-73798a2a8273" xlink:href="bip-20260630.xsd#bip_Othercashoperatingincomeexpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-73e6-8115-eea3b4c0b19e" xlink:to="loc_bip_Othercashoperatingincomeexpense_019e223a-ed78-7e96-bc50-73798a2a8273" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestExpense_019e223a-ed78-7ee0-8b33-6f90cb6b3400" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-73e6-8115-eea3b4c0b19e" xlink:to="loc_ifrs-full_InterestExpense_019e223a-ed78-7ee0-8b33-6f90cb6b3400" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_FundsFromOperations_019e223a-ed78-72c8-8ac6-e0b484cdf6b0" xlink:href="bip-20260630.xsd#bip_FundsFromOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-73e6-8115-eea3b4c0b19e" xlink:to="loc_bip_FundsFromOperations_019e223a-ed78-72c8-8ac6-e0b484cdf6b0" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepreciationAndAmortisationExpense_019e223a-ed78-72ba-b456-234501f16711" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepreciationAndAmortisationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-73e6-8115-eea3b4c0b19e" xlink:to="loc_ifrs-full_DepreciationAndAmortisationExpense_019e223a-ed78-72ba-b456-234501f16711" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxExpenseIncome_019e223a-ed78-7633-9c04-3fb80f1491fb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DeferredTaxExpenseIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-73e6-8115-eea3b4c0b19e" xlink:to="loc_ifrs-full_DeferredTaxExpenseIncome_019e223a-ed78-7633-9c04-3fb80f1491fb" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_Gainslossesonchangeinfairvalueofderivativesandother_019e223a-ed78-7da8-bd12-d18cebf1808f" xlink:href="bip-20260630.xsd#bip_Gainslossesonchangeinfairvalueofderivativesandother"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-73e6-8115-eea3b4c0b19e" xlink:to="loc_bip_Gainslossesonchangeinfairvalueofderivativesandother_019e223a-ed78-7da8-bd12-d18cebf1808f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_019e223a-ed78-7b93-bcf4-2f5a74b18702" 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_019e223a-ed78-73e6-8115-eea3b4c0b19e" xlink:to="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_019e223a-ed78-7b93-bcf4-2f5a74b18702" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NetIncomeAttributableToNoncontrollingInterestAndPreferredUnitholders_019e223a-ed78-72e4-a14d-263a803057ba" xlink:href="bip-20260630.xsd#bip_NetIncomeAttributableToNoncontrollingInterestAndPreferredUnitholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-73e6-8115-eea3b4c0b19e" xlink:to="loc_bip_NetIncomeAttributableToNoncontrollingInterestAndPreferredUnitholders_019e223a-ed78-72e4-a14d-263a803057ba" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NetIncomeLossAttributableToPartnership_019e223a-ed78-7b83-abcd-07f8522bf7db" xlink:href="bip-20260630.xsd#bip_NetIncomeLossAttributableToPartnership"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-73e6-8115-eea3b4c0b19e" xlink:to="loc_bip_NetIncomeLossAttributableToPartnership_019e223a-ed78-7b83-abcd-07f8522bf7db" xlink:type="arc" order="11"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/SEGMENTINFORMATIONAssetsDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#SEGMENTINFORMATIONAssetsDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/SEGMENTINFORMATIONAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-7781-bdda-f9c0f9434ef4" 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_019e223a-ed78-71d2-beae-937a83c86df2" 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_019e223a-ed78-7781-bdda-f9c0f9434ef4" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_019e223a-ed78-71d2-beae-937a83c86df2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsAxis_019e223a-ed78-7703-8655-579e50a61937" 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_019e223a-ed78-71d2-beae-937a83c86df2" xlink:to="loc_ifrs-full_SegmentConsolidationItemsAxis_019e223a-ed78-7703-8655-579e50a61937" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsDomain_019e223a-ed78-7703-8655-579e50a61937_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_019e223a-ed78-7703-8655-579e50a61937" xlink:to="loc_ifrs-full_SegmentConsolidationItemsDomain_019e223a-ed78-7703-8655-579e50a61937_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentConsolidationItemsDomain_019e223a-ed78-71ce-b2be-d34cd31eb805" 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_019e223a-ed78-7703-8655-579e50a61937" xlink:to="loc_ifrs-full_SegmentConsolidationItemsDomain_019e223a-ed78-71ce-b2be-d34cd31eb805" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OperatingSegmentsMember_019e223a-ed78-71fe-b633-56ce232e9a25" 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_019e223a-ed78-71ce-b2be-d34cd31eb805" xlink:to="loc_ifrs-full_OperatingSegmentsMember_019e223a-ed78-71fe-b633-56ce232e9a25" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MaterialReconcilingItemsMember_019e223a-ed78-7b9d-9e37-f39c1025f58f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_MaterialReconcilingItemsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentConsolidationItemsDomain_019e223a-ed78-71ce-b2be-d34cd31eb805" xlink:to="loc_ifrs-full_MaterialReconcilingItemsMember_019e223a-ed78-7b9d-9e37-f39c1025f58f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsAxis_019e223a-ed78-754e-a663-ca7875027032" 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_019e223a-ed78-71d2-beae-937a83c86df2" xlink:to="loc_ifrs-full_SegmentsAxis_019e223a-ed78-754e-a663-ca7875027032" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_019e223a-ed78-754e-a663-ca7875027032_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_019e223a-ed78-754e-a663-ca7875027032" xlink:to="loc_ifrs-full_SegmentsDomain_019e223a-ed78-754e-a663-ca7875027032_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_019e223a-ed78-77f8-8aa7-5f9e3a331e73" 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_019e223a-ed78-754e-a663-ca7875027032" xlink:to="loc_ifrs-full_SegmentsDomain_019e223a-ed78-77f8-8aa7-5f9e3a331e73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_UtilitiesMember_019e223a-ed78-74ef-aab3-790a38dd37fb" xlink:href="bip-20260630.xsd#bip_UtilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ed78-77f8-8aa7-5f9e3a331e73" xlink:to="loc_bip_UtilitiesMember_019e223a-ed78-74ef-aab3-790a38dd37fb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_TransportMember_019e223a-ed78-7a1b-b46a-b8f7e74a9c88" xlink:href="bip-20260630.xsd#bip_TransportMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ed78-77f8-8aa7-5f9e3a331e73" xlink:to="loc_bip_TransportMember_019e223a-ed78-7a1b-b46a-b8f7e74a9c88" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MidstreamMember_019e223a-ed78-77dc-ae4a-bbe5f1f6bb2a" xlink:href="bip-20260630.xsd#bip_MidstreamMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ed78-77f8-8aa7-5f9e3a331e73" xlink:to="loc_bip_MidstreamMember_019e223a-ed78-77dc-ae4a-bbe5f1f6bb2a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DataInfrastructureMember_019e223a-ed78-7b7f-9b1a-24f430033e7c" xlink:href="bip-20260630.xsd#bip_DataInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ed78-77f8-8aa7-5f9e3a331e73" xlink:to="loc_bip_DataInfrastructureMember_019e223a-ed78-7b7f-9b1a-24f430033e7c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_Corporate1Member_019e223a-ed78-7051-99ad-19936c11db1b" xlink:href="bip-20260630.xsd#bip_Corporate1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ed78-77f8-8aa7-5f9e3a331e73" xlink:to="loc_bip_Corporate1Member_019e223a-ed78-7051-99ad-19936c11db1b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_019e223a-ed78-781d-93e5-551649a379e5" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_019e223a-ed78-71d2-beae-937a83c86df2" xlink:to="loc_srt_ConsolidationItemsAxis_019e223a-ed78-781d-93e5-551649a379e5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e223a-ed78-781d-93e5-551649a379e5_default" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_019e223a-ed78-781d-93e5-551649a379e5" xlink:to="loc_srt_ConsolidationItemsDomain_019e223a-ed78-781d-93e5-551649a379e5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_019e223a-ed78-7eca-b17d-aad7bcfbbac6" xlink:href="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_019e223a-ed78-781d-93e5-551649a379e5" xlink:to="loc_srt_ConsolidationItemsDomain_019e223a-ed78-7eca-b17d-aad7bcfbbac6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssociatesMember_019e223a-ed78-76b9-99f3-f9e309843218" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AssociatesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e223a-ed78-7eca-b17d-aad7bcfbbac6" xlink:to="loc_ifrs-full_AssociatesMember_019e223a-ed78-76b9-99f3-f9e309843218" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncontrollingInterestsMember_019e223a-ed78-7577-80f7-72340418bf62" 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_srt_ConsolidationItemsDomain_019e223a-ed78-7eca-b17d-aad7bcfbbac6" xlink:to="loc_ifrs-full_NoncontrollingInterestsMember_019e223a-ed78-7577-80f7-72340418bf62" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_WorkingcapitaladjustmentandotherMember_019e223a-ed78-7565-b1d0-e68458c0a88b" xlink:href="bip-20260630.xsd#bip_WorkingcapitaladjustmentandotherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_019e223a-ed78-7eca-b17d-aad7bcfbbac6" xlink:to="loc_bip_WorkingcapitaladjustmentandotherMember_019e223a-ed78-7565-b1d0-e68458c0a88b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets_019e223a-ed78-729f-8c43-3cdd19250504" 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_019e223a-ed78-7781-bdda-f9c0f9434ef4" xlink:to="loc_ifrs-full_Assets_019e223a-ed78-729f-8c43-3cdd19250504" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/ASSETSANDLIABILITIESCLASSIFIEDASHELDFORSALEAdditionalInformationDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#ASSETSANDLIABILITIESCLASSIFIEDASHELDFORSALEAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/ASSETSANDLIABILITIESCLASSIFIEDASHELDFORSALEAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019e223a-ed78-7cd4-badc-67b3a166a052" xlink:href="bip-20260630.xsd#bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleTable_019e223a-ed78-7c53-954d-30eda352179e" xlink:href="bip-20260630.xsd#bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019e223a-ed78-7cd4-badc-67b3a166a052" xlink:to="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleTable_019e223a-ed78-7c53-954d-30eda352179e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_019e223a-ed78-7358-ad3f-9614437048dd" 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_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleTable_019e223a-ed78-7c53-954d-30eda352179e" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_019e223a-ed78-7358-ad3f-9614437048dd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019e223a-ed78-7358-ad3f-9614437048dd_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_019e223a-ed78-7358-ad3f-9614437048dd" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019e223a-ed78-7358-ad3f-9614437048dd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019e223a-ed78-79cb-a4ca-bc4e0b071025" 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_019e223a-ed78-7358-ad3f-9614437048dd" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019e223a-ed78-79cb-a4ca-bc4e0b071025" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember_019e223a-ed78-7d5b-9bba-38141f351892" 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_019e223a-ed78-79cb-a4ca-bc4e0b071025" xlink:to="loc_ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember_019e223a-ed78-7d5b-9bba-38141f351892" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e223a-ed78-748d-b8ea-4f51555e1431" 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_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleTable_019e223a-ed78-7c53-954d-30eda352179e" xlink:to="loc_dei_LegalEntityAxis_019e223a-ed78-748d-b8ea-4f51555e1431" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e223a-ed78-748d-b8ea-4f51555e1431_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_019e223a-ed78-748d-b8ea-4f51555e1431" xlink:to="loc_dei_EntityDomain_019e223a-ed78-748d-b8ea-4f51555e1431_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e223a-ed78-72e1-8d96-21f170cab8a7" 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_019e223a-ed78-748d-b8ea-4f51555e1431" xlink:to="loc_dei_EntityDomain_019e223a-ed78-72e1-8d96-21f170cab8a7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BrookfieldInfrastructureMember_019e223a-ed78-7d57-afb3-c55479a6dbf2" xlink:href="bip-20260630.xsd#bip_BrookfieldInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e223a-ed78-72e1-8d96-21f170cab8a7" xlink:to="loc_bip_BrookfieldInfrastructureMember_019e223a-ed78-7d57-afb3-c55479a6dbf2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInAssociate_019e223a-ed78-7b34-8056-7996b9f22d03" 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_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019e223a-ed78-7cd4-badc-67b3a166a052" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInAssociate_019e223a-ed78-7b34-8056-7996b9f22d03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ConsiderationReceivableAssetsAndLiabilitiesHeldForSale_019f5fa5-b92f-7d2f-9920-3870f5a22833" xlink:href="bip-20260630.xsd#bip_ConsiderationReceivableAssetsAndLiabilitiesHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019e223a-ed78-7cd4-badc-67b3a166a052" xlink:to="loc_bip_ConsiderationReceivableAssetsAndLiabilitiesHeldForSale_019f5fa5-b92f-7d2f-9920-3870f5a22833" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/ASSETSANDLIABILITIESCLASSIFIEDASHELDFORSALEAssetsandLiabilitiesScheduleDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#ASSETSANDLIABILITIESCLASSIFIEDASHELDFORSALEAssetsandLiabilitiesScheduleDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/ASSETSANDLIABILITIESCLASSIFIEDASHELDFORSALEAssetsandLiabilitiesScheduleDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019f5fa4-6650-7b69-9631-19fd34dd4476" xlink:href="bip-20260630.xsd#bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleTable_019f5fa4-6650-75cc-bea2-2d67de9c2e43" xlink:href="bip-20260630.xsd#bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019f5fa4-6650-7b69-9631-19fd34dd4476" xlink:to="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleTable_019f5fa4-6650-75cc-bea2-2d67de9c2e43" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_019f5fa4-6650-7858-83a9-7d621c098adc" 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_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleTable_019f5fa4-6650-75cc-bea2-2d67de9c2e43" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_019f5fa4-6650-7858-83a9-7d621c098adc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019f5fa4-6650-7858-83a9-7d621c098adc_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_019f5fa4-6650-7858-83a9-7d621c098adc" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019f5fa4-6650-7858-83a9-7d621c098adc_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019f5fa4-6650-7daa-b080-24e7fc106d0c" 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_019f5fa4-6650-7858-83a9-7d621c098adc" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019f5fa4-6650-7daa-b080-24e7fc106d0c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember_019f5fa4-6650-7798-b335-c1ff4658d537" 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_019f5fa4-6650-7daa-b080-24e7fc106d0c" xlink:to="loc_ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember_019f5fa4-6650-7798-b335-c1ff4658d537" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_CashAndCashEquivalentsClassifiedAsHeldForSale_019e223a-ed78-7cf8-9878-e3a0feeb665a" xlink:href="bip-20260630.xsd#bip_CashAndCashEquivalentsClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019f5fa4-6650-7b69-9631-19fd34dd4476" xlink:to="loc_bip_CashAndCashEquivalentsClassifiedAsHeldForSale_019e223a-ed78-7cf8-9878-e3a0feeb665a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AccountsReceivableAndOtherCurrentAssetsClassifiedAsHeldForSale_019e223a-ed78-7d50-9ee9-6d48dfad212c" xlink:href="bip-20260630.xsd#bip_AccountsReceivableAndOtherCurrentAssetsClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019f5fa4-6650-7b69-9631-19fd34dd4476" xlink:to="loc_bip_AccountsReceivableAndOtherCurrentAssetsClassifiedAsHeldForSale_019e223a-ed78-7d50-9ee9-6d48dfad212c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PropertyPlantAndEquipmentClassifiedAsHeldForSale_019f5fa3-9b6d-713e-a1d9-702094f556bf" xlink:href="bip-20260630.xsd#bip_PropertyPlantAndEquipmentClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019f5fa4-6650-7b69-9631-19fd34dd4476" xlink:to="loc_bip_PropertyPlantAndEquipmentClassifiedAsHeldForSale_019f5fa3-9b6d-713e-a1d9-702094f556bf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_GoodwillAndOtherNonCurrentAssetsClassifiedAsHeldForSale_019e223a-ed78-7fe0-acfb-fde163111a82" xlink:href="bip-20260630.xsd#bip_GoodwillAndOtherNonCurrentAssetsClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019f5fa4-6650-7b69-9631-19fd34dd4476" xlink:to="loc_bip_GoodwillAndOtherNonCurrentAssetsClassifiedAsHeldForSale_019e223a-ed78-7fe0-acfb-fde163111a82" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssetsClassifiedAsHeldForSale_019e223a-ed78-7bf0-bfb6-8d3bcd9a4173" xlink:href="bip-20260630.xsd#bip_AssetsClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019f5fa4-6650-7b69-9631-19fd34dd4476" xlink:to="loc_bip_AssetsClassifiedAsHeldForSale_019e223a-ed78-7bf0-bfb6-8d3bcd9a4173" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AccountsPayableAndOtherLiabilitiesClassifiedAsHeldForSale_019e223a-ed78-75eb-84c5-d0d3bbe5f7a3" xlink:href="bip-20260630.xsd#bip_AccountsPayableAndOtherLiabilitiesClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019f5fa4-6650-7b69-9631-19fd34dd4476" xlink:to="loc_bip_AccountsPayableAndOtherLiabilitiesClassifiedAsHeldForSale_019e223a-ed78-75eb-84c5-d0d3bbe5f7a3" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DeferredIncomeTaxLiabilityClassifiedAsHeldForSale_019e223a-ed78-78af-a027-1ec1de09cc24" xlink:href="bip-20260630.xsd#bip_DeferredIncomeTaxLiabilityClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019f5fa4-6650-7b69-9631-19fd34dd4476" xlink:to="loc_bip_DeferredIncomeTaxLiabilityClassifiedAsHeldForSale_019e223a-ed78-78af-a027-1ec1de09cc24" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonRecourseBorrowingsClassifiedAsHeldForSale_019e223a-ed78-7e58-a00a-1a22facce29e" xlink:href="bip-20260630.xsd#bip_NonRecourseBorrowingsClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019f5fa4-6650-7b69-9631-19fd34dd4476" xlink:to="loc_bip_NonRecourseBorrowingsClassifiedAsHeldForSale_019e223a-ed78-7e58-a00a-1a22facce29e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_LiabilitiesClassifiedAsHeldForSale_019e223a-ed78-7cc2-bb1f-699824f5eb4a" xlink:href="bip-20260630.xsd#bip_LiabilitiesClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019f5fa4-6650-7b69-9631-19fd34dd4476" xlink:to="loc_bip_LiabilitiesClassifiedAsHeldForSale_019e223a-ed78-7cc2-bb1f-699824f5eb4a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NetAssetsClassifiedAsHeldForSale_019e223a-ed78-7747-8a01-8d902740b11b" xlink:href="bip-20260630.xsd#bip_NetAssetsClassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfDetailedInformationAboutAssetsAndLiabilitiesClassifiedAsHeldForSaleLineItems_019f5fa4-6650-7b69-9631-19fd34dd4476" xlink:to="loc_bip_NetAssetsClassifiedAsHeldForSale_019e223a-ed78-7747-8a01-8d902740b11b" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/DISPOSITIONOFBUSINESSESDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#DISPOSITIONOFBUSINESSESDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/DISPOSITIONOFBUSINESSESDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e737b-9e23-7c75-853d-96048a03dbde" xlink:href="bip-20260630.xsd#bip_DisclosureOfAssociatesAndJointVenturesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfAssociatesAndJointVenturesTable_019e737b-9e23-7b88-9b40-b261605ade8a" xlink:href="bip-20260630.xsd#bip_DisclosureOfAssociatesAndJointVenturesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e737b-9e23-7c75-853d-96048a03dbde" xlink:to="loc_bip_DisclosureOfAssociatesAndJointVenturesTable_019e737b-9e23-7b88-9b40-b261605ade8a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_019e737b-9e23-7713-84eb-236a3668da5c" 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_bip_DisclosureOfAssociatesAndJointVenturesTable_019e737b-9e23-7b88-9b40-b261605ade8a" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_019e737b-9e23-7713-84eb-236a3668da5c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e737b-9e23-7713-84eb-236a3668da5c_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_019e737b-9e23-7713-84eb-236a3668da5c" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e737b-9e23-7713-84eb-236a3668da5c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e737b-9e23-746c-a14d-bd471bfec9b0" 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_019e737b-9e23-7713-84eb-236a3668da5c" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e737b-9e23-746c-a14d-bd471bfec9b0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.S.BulkFiberNetworkMember_019f896f-46aa-7908-af64-a89a5a2f68f5" xlink:href="bip-20260630.xsd#bip_U.S.BulkFiberNetworkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e737b-9e23-746c-a14d-bd471bfec9b0" xlink:to="loc_bip_U.S.BulkFiberNetworkMember_019f896f-46aa-7908-af64-a89a5a2f68f5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_IndianTelecomTowersOperationMember_019f5f56-ee1f-7094-a444-925d8dd09ff9" xlink:href="bip-20260630.xsd#bip_IndianTelecomTowersOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e737b-9e23-746c-a14d-bd471bfec9b0" xlink:to="loc_bip_IndianTelecomTowersOperationMember_019f5f56-ee1f-7094-a444-925d8dd09ff9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.K.RailOperationMember_019e739d-0ef8-7d25-b5f7-e66650ea9f4c" xlink:href="bip-20260630.xsd#bip_U.K.RailOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e737b-9e23-746c-a14d-bd471bfec9b0" xlink:to="loc_bip_U.K.RailOperationMember_019e739d-0ef8-7d25-b5f7-e66650ea9f4c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NorthAmericanGasStoragePlatformMember_019e737b-9e23-78d7-8e86-9f5cc56d180a" xlink:href="bip-20260630.xsd#bip_NorthAmericanGasStoragePlatformMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e737b-9e23-746c-a14d-bd471bfec9b0" xlink:to="loc_bip_NorthAmericanGasStoragePlatformMember_019e737b-9e23-78d7-8e86-9f5cc56d180a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BrazilianElectricityTransmissionOperationMember_019e739e-db10-7c0e-a7a8-867d86857b4f" xlink:href="bip-20260630.xsd#bip_BrazilianElectricityTransmissionOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e737b-9e23-746c-a14d-bd471bfec9b0" xlink:to="loc_bip_BrazilianElectricityTransmissionOperationMember_019e739e-db10-7c0e-a7a8-867d86857b4f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.S.RetailColocationDataCenterOperationMember_019fc59f-5c86-7823-b992-8ecc61395828" xlink:href="bip-20260630.xsd#bip_U.S.RetailColocationDataCenterOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e737b-9e23-746c-a14d-bd471bfec9b0" xlink:to="loc_bip_U.S.RetailColocationDataCenterOperationMember_019fc59f-5c86-7823-b992-8ecc61395828" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BrookfieldInfrastructureMember_019e737b-f80f-738f-8541-46e81b11a6fc" xlink:href="bip-20260630.xsd#bip_BrookfieldInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e737b-9e23-746c-a14d-bd471bfec9b0" xlink:to="loc_bip_BrookfieldInfrastructureMember_019e737b-f80f-738f-8541-46e81b11a6fc" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_IndianGasTransmissionOperationMember_019e737c-19d2-74c1-9834-5a7af7e52c4b" xlink:href="bip-20260630.xsd#bip_IndianGasTransmissionOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e737b-9e23-746c-a14d-bd471bfec9b0" xlink:to="loc_bip_IndianGasTransmissionOperationMember_019e737c-19d2-74c1-9834-5a7af7e52c4b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_EuropeanHyperscaleDataCenterPlatformMember_019e737c-31d5-7925-aa4c-7c314c513818" xlink:href="bip-20260630.xsd#bip_EuropeanHyperscaleDataCenterPlatformMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e737b-9e23-746c-a14d-bd471bfec9b0" xlink:to="loc_bip_EuropeanHyperscaleDataCenterPlatformMember_019e737c-31d5-7925-aa4c-7c314c513818" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_GlobalIntermodalLogisticsOperationMember_019e737c-4841-7f43-8234-f9f0d111250b" xlink:href="bip-20260630.xsd#bip_GlobalIntermodalLogisticsOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e737b-9e23-746c-a14d-bd471bfec9b0" xlink:to="loc_bip_GlobalIntermodalLogisticsOperationMember_019e737c-4841-7f43-8234-f9f0d111250b" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e737b-9e23-7b97-bb37-26a831faff8b" 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_bip_DisclosureOfAssociatesAndJointVenturesTable_019e737b-9e23-7b88-9b40-b261605ade8a" xlink:to="loc_dei_LegalEntityAxis_019e737b-9e23-7b97-bb37-26a831faff8b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e737b-9e23-7b97-bb37-26a831faff8b_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_019e737b-9e23-7b97-bb37-26a831faff8b" xlink:to="loc_dei_EntityDomain_019e737b-9e23-7b97-bb37-26a831faff8b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e737b-9e23-709d-b76d-160e42753c6d" 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_019e737b-9e23-7b97-bb37-26a831faff8b" xlink:to="loc_dei_EntityDomain_019e737b-9e23-709d-b76d-160e42753c6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ConsortiumMember_019e737b-9e23-7f67-9d8b-9ee1c6625ed4" xlink:href="bip-20260630.xsd#bip_ConsortiumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e737b-9e23-709d-b76d-160e42753c6d" xlink:to="loc_bip_ConsortiumMember_019e737b-9e23-7f67-9d8b-9ee1c6625ed4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_019e737b-9e23-7556-876f-0e1fcedd9d6a" 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_bip_DisclosureOfAssociatesAndJointVenturesTable_019e737b-9e23-7b88-9b40-b261605ade8a" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesClassifiedAsHeldForSaleAxis_019e737b-9e23-7556-876f-0e1fcedd9d6a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019e737b-9e23-7556-876f-0e1fcedd9d6a_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_019e737b-9e23-7556-876f-0e1fcedd9d6a" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019e737b-9e23-7556-876f-0e1fcedd9d6a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019e737b-9e23-7686-8817-2461c3fc611b" 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_019e737b-9e23-7556-876f-0e1fcedd9d6a" xlink:to="loc_ifrs-full_AssetsAndLiabilitiesNotClassifiedAsHeldForSaleMember_019e737b-9e23-7686-8817-2461c3fc611b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember_019e737b-9e23-72f2-8eb5-7c131412afb4" 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_019e737b-9e23-7686-8817-2461c3fc611b" xlink:to="loc_ifrs-full_DisposalGroupsClassifiedAsHeldForSaleMember_019e737b-9e23-72f2-8eb5-7c131412afb4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_019fc5a0-9b00-791d-8209-566dd77c0048" 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_bip_DisclosureOfAssociatesAndJointVenturesTable_019e737b-9e23-7b88-9b40-b261605ade8a" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodAxis_019fc5a0-9b00-791d-8209-566dd77c0048" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019fc5a0-9b00-791d-8209-566dd77c0048_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_019fc5a0-9b00-791d-8209-566dd77c0048" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019fc5a0-9b00-791d-8209-566dd77c0048_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019fc5a0-9b00-7c84-a49a-0d200a90a48f" 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_019fc5a0-9b00-791d-8209-566dd77c0048" xlink:to="loc_ifrs-full_NonadjustingEventsAfterReportingPeriodDomain_019fc5a0-9b00-7c84-a49a-0d200a90a48f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisposalOfMajorSubsidiaryMember_019fc5a1-2ed0-702f-aafa-d01336a7bc85" 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_019fc5a0-9b00-7c84-a49a-0d200a90a48f" xlink:to="loc_ifrs-full_DisposalOfMajorSubsidiaryMember_019fc5a1-2ed0-702f-aafa-d01336a7bc85" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_019e737c-31d5-783e-9b0e-2f561b3d4708" 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_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e737b-9e23-7c75-853d-96048a03dbde" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_019e737c-31d5-783e-9b0e-2f561b3d4708" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromChangesInOwnershipInterestsInSubsidiaries_019e737b-9e23-72fc-948d-5ad708049d73" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromChangesInOwnershipInterestsInSubsidiaries"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e737b-9e23-7c75-853d-96048a03dbde" xlink:to="loc_ifrs-full_ProceedsFromChangesInOwnershipInterestsInSubsidiaries_019e737b-9e23-72fc-948d-5ad708049d73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ProportionOfOwnershipInterestInAssociateAndJointVenture_019e737c-31d5-7c49-9ea6-64aa458b8754" xlink:href="bip-20260630.xsd#bip_ProportionOfOwnershipInterestInAssociateAndJointVenture"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e737b-9e23-7c75-853d-96048a03dbde" xlink:to="loc_bip_ProportionOfOwnershipInterestInAssociateAndJointVenture_019e737c-31d5-7c49-9ea6-64aa458b8754" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_GainLossonDispositionofBusiness_019e737b-9e23-77e2-9a8d-0fdff8e245d9" xlink:href="bip-20260630.xsd#bip_GainLossonDispositionofBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e737b-9e23-7c75-853d-96048a03dbde" xlink:to="loc_bip_GainLossonDispositionofBusiness_019e737b-9e23-77e2-9a8d-0fdff8e245d9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInAssociate_019e737b-9e23-7cbf-8b31-64cce08a5e91" 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_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e737b-9e23-7c75-853d-96048a03dbde" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInAssociate_019e737b-9e23-7cbf-8b31-64cce08a5e91" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NumberOfElectricityTransmissionConcessionsSold_019f40f2-caaa-7426-bfaa-4698f5d502c7" xlink:href="bip-20260630.xsd#bip_NumberOfElectricityTransmissionConcessionsSold"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e737b-9e23-7c75-853d-96048a03dbde" xlink:to="loc_bip_NumberOfElectricityTransmissionConcessionsSold_019f40f2-caaa-7426-bfaa-4698f5d502c7" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NumberOfElectricityTransmissionConcessions_019f40f2-caaa-7b58-a306-6e63ff8ced4e" xlink:href="bip-20260630.xsd#bip_NumberOfElectricityTransmissionConcessions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e737b-9e23-7c75-853d-96048a03dbde" xlink:to="loc_bip_NumberOfElectricityTransmissionConcessions_019f40f2-caaa-7b58-a306-6e63ff8ced4e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromSalesOfInterestsInAssociates_019e737b-f80f-7a3d-8436-0c1c76325077" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromSalesOfInterestsInAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e737b-9e23-7c75-853d-96048a03dbde" xlink:to="loc_ifrs-full_ProceedsFromSalesOfInterestsInAssociates_019e737b-f80f-7a3d-8436-0c1c76325077" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ConsiderationReceivableAssetsAndLiabilitiesHeldForSale_019e737c-31d5-7ba8-aa6a-6ce31fc25c5e" xlink:href="bip-20260630.xsd#bip_ConsiderationReceivableAssetsAndLiabilitiesHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e737b-9e23-7c75-853d-96048a03dbde" xlink:to="loc_bip_ConsiderationReceivableAssetsAndLiabilitiesHeldForSale_019e737c-31d5-7ba8-aa6a-6ce31fc25c5e" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/ACQUISITIONOFBUSINESSESAdditionalInformationDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#ACQUISITIONOFBUSINESSESAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/ACQUISITIONOFBUSINESSESAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_019e7368-109a-7e0c-bc7e-c81125b2c705" 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_019e7368-109a-7078-b5b6-d29cf370f576" 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_019e7368-109a-7e0c-bc7e-c81125b2c705" xlink:to="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_019e7368-109a-7078-b5b6-d29cf370f576" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsAxis_019e7368-109a-7572-857e-2d0ac900b0e0" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_019e7368-109a-7078-b5b6-d29cf370f576" xlink:to="loc_ifrs-full_BusinessCombinationsAxis_019e7368-109a-7572-857e-2d0ac900b0e0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_019e7368-109a-7572-857e-2d0ac900b0e0_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_019e7368-109a-7572-857e-2d0ac900b0e0" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_019e7368-109a-7572-857e-2d0ac900b0e0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_019e7368-109a-77d6-8ad4-3919de4f23e6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_019e7368-109a-7572-857e-2d0ac900b0e0" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_019e7368-109a-77d6-8ad4-3919de4f23e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.S.BulkFiberNetworkMember_019e7368-109a-7f6b-95da-79641565795c" xlink:href="bip-20260630.xsd#bip_U.S.BulkFiberNetworkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_019e7368-109a-77d6-8ad4-3919de4f23e6" xlink:to="loc_bip_U.S.BulkFiberNetworkMember_019e7368-109a-7f6b-95da-79641565795c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.S.RefinedProductsPipelineSystemMember_019e7368-605e-761b-aa4c-d615884a87a0" xlink:href="bip-20260630.xsd#bip_U.S.RefinedProductsPipelineSystemMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_019e7368-109a-77d6-8ad4-3919de4f23e6" xlink:to="loc_bip_U.S.RefinedProductsPipelineSystemMember_019e7368-605e-761b-aa4c-d615884a87a0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BrazilianElectricityTransmissionOperationMember_019e7368-9b47-7936-aba8-d5d9c0cd1a2d" xlink:href="bip-20260630.xsd#bip_BrazilianElectricityTransmissionOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_019e7368-109a-77d6-8ad4-3919de4f23e6" xlink:to="loc_bip_BrazilianElectricityTransmissionOperationMember_019e7368-9b47-7936-aba8-d5d9c0cd1a2d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019e7368-109a-705c-aba0-3430c42cc321" 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_DisclosureOfBusinessCombinationsTable_019e7368-109a-7078-b5b6-d29cf370f576" xlink:to="loc_dei_LegalEntityAxis_019e7368-109a-705c-aba0-3430c42cc321" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e7368-109a-705c-aba0-3430c42cc321_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_019e7368-109a-705c-aba0-3430c42cc321" xlink:to="loc_dei_EntityDomain_019e7368-109a-705c-aba0-3430c42cc321_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019e7368-109a-7f43-9120-471f35f00940" 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_019e7368-109a-705c-aba0-3430c42cc321" xlink:to="loc_dei_EntityDomain_019e7368-109a-7f43-9120-471f35f00940" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_HotwireConsortiumMember_019e7368-109a-7d1f-bd0c-dfedda3297da" xlink:href="bip-20260630.xsd#bip_HotwireConsortiumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e7368-109a-7f43-9120-471f35f00940" xlink:to="loc_bip_HotwireConsortiumMember_019e7368-109a-7d1f-bd0c-dfedda3297da" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ColonialConsortiumMember_019e7368-605e-7c07-acb9-d2ef93a83e2c" xlink:href="bip-20260630.xsd#bip_ColonialConsortiumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e7368-109a-7f43-9120-471f35f00940" xlink:to="loc_bip_ColonialConsortiumMember_019e7368-605e-7c07-acb9-d2ef93a83e2c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MantiqueiraConsortiumMember_019e7368-9b47-7260-ae9d-e29ce9912355" xlink:href="bip-20260630.xsd#bip_MantiqueiraConsortiumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019e7368-109a-7f43-9120-471f35f00940" xlink:to="loc_bip_MantiqueiraConsortiumMember_019e7368-9b47-7260-ae9d-e29ce9912355" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_019e7368-109a-7c12-aa33-94c5643b1a87" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_019e7368-109a-7e0c-bc7e-c81125b2c705" xlink:to="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_019e7368-109a-7c12-aa33-94c5643b1a87" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PercentageOfVotingEquityInterestsAcquired_019e7368-109a-71da-9929-aeec37493f2b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PercentageOfVotingEquityInterestsAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_019e7368-109a-7e0c-bc7e-c81125b2c705" xlink:to="loc_ifrs-full_PercentageOfVotingEquityInterestsAcquired_019e7368-109a-71da-9929-aeec37493f2b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination_019e7368-109a-702a-a088-4d9e9ef385ce" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_019e7368-109a-7e0c-bc7e-c81125b2c705" xlink:to="loc_ifrs-full_AcquisitionrelatedCostsRecognisedAsExpenseForTransactionRecognisedSeparatelyFromAcquisitionOfAssetsAndAssumptionOfLiabilitiesInBusinessCombination_019e7368-109a-702a-a088-4d9e9ef385ce" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_019e7368-3bd2-7bb7-a780-e1f97d786e25" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_019e7368-109a-7e0c-bc7e-c81125b2c705" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_019e7368-3bd2-7bb7-a780-e1f97d786e25" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate_019e7368-3bd3-781b-bb5e-f4e908602edc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_019e7368-109a-7e0c-bc7e-c81125b2c705" xlink:to="loc_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate_019e7368-3bd3-781b-bb5e-f4e908602edc" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill_019e7368-3bd3-75eb-aad8-7c22dba47c5b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_019e7368-109a-7e0c-bc7e-c81125b2c705" xlink:to="loc_ifrs-full_UsefulLifeMeasuredAsPeriodOfTimeIntangibleAssetsOtherThanGoodwill_019e7368-3bd3-75eb-aad8-7c22dba47c5b" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_EquityFundedConsideration_019e7368-605e-7bfb-a60a-17281c324a0d" xlink:href="bip-20260630.xsd#bip_EquityFundedConsideration"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_019e7368-109a-7e0c-bc7e-c81125b2c705" xlink:to="loc_bip_EquityFundedConsideration_019e7368-605e-7bfb-a60a-17281c324a0d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashTransferred_019e7368-9b47-7b4b-8bbf-7d8bafd28132" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_019e7368-109a-7e0c-bc7e-c81125b2c705" xlink:to="loc_ifrs-full_CashTransferred_019e7368-9b47-7b4b-8bbf-7d8bafd28132" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_019e7368-9b47-7ac4-8731-09c129c9dfb5" 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_DisclosureOfBusinessCombinationsLineItems_019e7368-109a-7e0c-bc7e-c81125b2c705" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_019e7368-9b47-7ac4-8731-09c129c9dfb5" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BusinessAcquisitionProformaRevenue_019e7368-be8f-7b48-bec7-1598a2ccee72" xlink:href="bip-20260630.xsd#bip_BusinessAcquisitionProformaRevenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_019e7368-109a-7e0c-bc7e-c81125b2c705" xlink:to="loc_bip_BusinessAcquisitionProformaRevenue_019e7368-be8f-7b48-bec7-1598a2ccee72" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BusinessAcquisitionProformaIncome_019e7368-be8f-7702-be8a-74384a33e826" xlink:href="bip-20260630.xsd#bip_BusinessAcquisitionProformaIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_019e7368-109a-7e0c-bc7e-c81125b2c705" xlink:to="loc_bip_BusinessAcquisitionProformaIncome_019e7368-be8f-7702-be8a-74384a33e826" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/ACQUISITIONOFBUSINESSESPurchasePriceAllocationDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#ACQUISITIONOFBUSINESSESPurchasePriceAllocationDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/ACQUISITIONOFBUSINESSESPurchasePriceAllocationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_019e223a-ed78-7126-8f50-c67802281a8e" 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_019e223a-ed78-70ac-aacf-dc20b613ae27" 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_019e223a-ed78-7126-8f50-c67802281a8e" xlink:to="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_019e223a-ed78-70ac-aacf-dc20b613ae27" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsAxis_019e223a-ed78-75c1-8d98-4aed8e9c6371" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsTable_019e223a-ed78-70ac-aacf-dc20b613ae27" xlink:to="loc_ifrs-full_BusinessCombinationsAxis_019e223a-ed78-75c1-8d98-4aed8e9c6371" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_019e223a-ed78-75c1-8d98-4aed8e9c6371_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_019e223a-ed78-75c1-8d98-4aed8e9c6371" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_019e223a-ed78-75c1-8d98-4aed8e9c6371_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_019e223a-ed78-7007-95f9-3fee84059154" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_019e223a-ed78-75c1-8d98-4aed8e9c6371" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_019e223a-ed78-7007-95f9-3fee84059154" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.S.BulkFiberNetworkMember_019e7369-5e8c-71fb-9bdd-0e26c74e87ce" xlink:href="bip-20260630.xsd#bip_U.S.BulkFiberNetworkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_019e223a-ed78-7007-95f9-3fee84059154" xlink:to="loc_bip_U.S.BulkFiberNetworkMember_019e7369-5e8c-71fb-9bdd-0e26c74e87ce" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.S.RefinedProductsPipelineSystemMember_019e7369-2d05-7db0-9b0e-fa66f7a6da0b" xlink:href="bip-20260630.xsd#bip_U.S.RefinedProductsPipelineSystemMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_019e223a-ed78-7007-95f9-3fee84059154" xlink:to="loc_bip_U.S.RefinedProductsPipelineSystemMember_019e7369-2d05-7db0-9b0e-fa66f7a6da0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BrazilianElectricityTransmissionOperationMember_019e223a-ed78-72a7-97d6-3a9de57f7451" xlink:href="bip-20260630.xsd#bip_BrazilianElectricityTransmissionOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_019e223a-ed78-7007-95f9-3fee84059154" xlink:to="loc_bip_BrazilianElectricityTransmissionOperationMember_019e223a-ed78-72a7-97d6-3a9de57f7451" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_IndividuallyInsignificantBusinessCombinationsMember_019e223a-ed78-72d5-acab-45390c03bd57" xlink:href="bip-20260630.xsd#bip_IndividuallyInsignificantBusinessCombinationsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_019e223a-ed78-7007-95f9-3fee84059154" xlink:to="loc_bip_IndividuallyInsignificantBusinessCombinationsMember_019e223a-ed78-72d5-acab-45390c03bd57" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract_019e223a-ed78-771a-80c7-294c04696d34" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_019e223a-ed78-7126-8f50-c67802281a8e" xlink:to="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract_019e223a-ed78-771a-80c7-294c04696d34" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashTransferred_019e223a-ed78-7573-9453-b276384261be" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract_019e223a-ed78-771a-80c7-294c04696d34" xlink:to="loc_ifrs-full_CashTransferred_019e223a-ed78-7573-9453-b276384261be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfEquityInterestInAcquireeHeldByAcquirerImmediatelyBeforeAcquisitionDate_019e223a-ed78-7162-a448-975a3baaf94a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitiondateFairValueOfEquityInterestInAcquireeHeldByAcquirerImmediatelyBeforeAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract_019e223a-ed78-771a-80c7-294c04696d34" xlink:to="loc_ifrs-full_AcquisitiondateFairValueOfEquityInterestInAcquireeHeldByAcquirerImmediatelyBeforeAcquisitionDate_019e223a-ed78-7162-a448-975a3baaf94a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate_019e736a-8c92-7efe-8b6a-493ab9926caf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract_019e223a-ed78-771a-80c7-294c04696d34" xlink:to="loc_ifrs-full_ContingentConsiderationRecognisedAsOfAcquisitionDate_019e736a-8c92-7efe-8b6a-493ab9926caf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_019e223a-ed78-7282-b8ec-d70bebe2281c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferredAbstract_019e223a-ed78-771a-80c7-294c04696d34" xlink:to="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_019e223a-ed78-7282-b8ec-d70bebe2281c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_019e223a-ed78-7592-a227-cb09b077a62a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfBusinessCombinationsLineItems_019e223a-ed78-7126-8f50-c67802281a8e" xlink:to="loc_ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_019e223a-ed78-7592-a227-cb09b077a62a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_019e736b-97de-7f63-a0ed-363e0553ba4b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_019e223a-ed78-7592-a227-cb09b077a62a" xlink:to="loc_ifrs-full_CashAndCashEquivalentsRecognisedAsOfAcquisitionDate_019e736b-97de-7f63-a0ed-363e0553ba4b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AccountReceivableAndOtherRecognisedAsOfAcquisitionDate_019e736b-97df-70bc-9b9e-257cc77ebe51" xlink:href="bip-20260630.xsd#bip_AccountReceivableAndOtherRecognisedAsOfAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_019e223a-ed78-7592-a227-cb09b077a62a" xlink:to="loc_bip_AccountReceivableAndOtherRecognisedAsOfAcquisitionDate_019e736b-97df-70bc-9b9e-257cc77ebe51" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_019e736b-97df-7e71-9e33-68ea5111456d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_019e223a-ed78-7592-a227-cb09b077a62a" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_019e736b-97df-7e71-9e33-68ea5111456d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate_019e736b-97df-7f43-afdb-81c5a59a1985" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_019e223a-ed78-7592-a227-cb09b077a62a" xlink:to="loc_ifrs-full_IdentifiableIntangibleAssetsRecognisedAsOfAcquisitionDate_019e736b-97df-7f43-afdb-81c5a59a1985" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GoodwillRecognisedAsOfAcquisitionDate_019e736b-97df-71d2-b5a9-55f99dbff185" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GoodwillRecognisedAsOfAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_019e223a-ed78-7592-a227-cb09b077a62a" xlink:to="loc_ifrs-full_GoodwillRecognisedAsOfAcquisitionDate_019e736b-97df-71d2-b5a9-55f99dbff185" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate_019e736b-97df-7691-99b7-e84b72ea7f4b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_019e223a-ed78-7592-a227-cb09b077a62a" xlink:to="loc_ifrs-full_TradeAndOtherPayablesRecognisedAsOfAcquisitionDate_019e736b-97df-7691-99b7-e84b72ea7f4b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_LeaseLiabilitiesRecognisedAsOfAcquisitionDate_019e736b-97df-7ce6-a4dc-bcadaa226a95" xlink:href="bip-20260630.xsd#bip_LeaseLiabilitiesRecognisedAsOfAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_019e223a-ed78-7592-a227-cb09b077a62a" xlink:to="loc_bip_LeaseLiabilitiesRecognisedAsOfAcquisitionDate_019e736b-97df-7ce6-a4dc-bcadaa226a95" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsRecognisedAsOfAcquisitionDate_019e736b-97df-7750-8708-1a42a23c667e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsRecognisedAsOfAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_019e223a-ed78-7592-a227-cb09b077a62a" xlink:to="loc_ifrs-full_BorrowingsRecognisedAsOfAcquisitionDate_019e736b-97df-7750-8708-1a42a23c667e" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate_019e736b-97df-70ab-b73c-c66af01f2c1d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_019e223a-ed78-7592-a227-cb09b077a62a" xlink:to="loc_ifrs-full_DeferredTaxLiabilitiesRecognisedAsOfAcquisitionDate_019e736b-97df-70ab-b73c-c66af01f2c1d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NetIdentifiableAssetsAcquiredLiabilitiesAssumedBeforeNonControllingInterests_019e736c-e951-7905-9fb9-3326b0bd1791" xlink:href="bip-20260630.xsd#bip_NetIdentifiableAssetsAcquiredLiabilitiesAssumedBeforeNonControllingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_019e223a-ed78-7592-a227-cb09b077a62a" xlink:to="loc_bip_NetIdentifiableAssetsAcquiredLiabilitiesAssumedBeforeNonControllingInterests_019e736c-e951-7905-9fb9-3326b0bd1791" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate_019e223a-ed78-7a9c-8092-f651475251c2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_019e223a-ed78-7592-a227-cb09b077a62a" xlink:to="loc_ifrs-full_NoncontrollingInterestInAcquireeRecognisedAtAcquisitionDate_019e223a-ed78-7a9c-8092-f651475251c2" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed_019e223a-ed78-7a69-998c-242361433141" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AdditionalDisclosuresForAmountsRecognisedAsOfAcquisitionDateForEachMajorClassOfAssetsAcquiredAndLiabilitiesAssumedAbstract_019e223a-ed78-7592-a227-cb09b077a62a" xlink:to="loc_ifrs-full_IdentifiableAssetsAcquiredLiabilitiesAssumed_019e223a-ed78-7a69-998c-242361433141" xlink:type="arc" order="12"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSAllocationofFinancialInstrumentsDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#FAIRVALUEOFFINANCIALINSTRUMENTSAllocationofFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSAllocationofFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_019e223a-ed78-7aee-b0b4-c3a2e817d67c" 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_019e223a-ed78-779d-a182-7082d1026e64" 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_019e223a-ed78-7aee-b0b4-c3a2e817d67c" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_019e223a-ed78-779d-a182-7082d1026e64" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis_019e223a-ed78-785d-bfef-09c88fb09a4d" 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_019e223a-ed78-779d-a182-7082d1026e64" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsAxis_019e223a-ed78-785d-bfef-09c88fb09a4d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019e223a-ed78-785d-bfef-09c88fb09a4d_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_019e223a-ed78-785d-bfef-09c88fb09a4d" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019e223a-ed78-785d-bfef-09c88fb09a4d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019e223a-ed78-75e7-846c-3d737148a93a" 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_019e223a-ed78-785d-bfef-09c88fb09a4d" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019e223a-ed78-75e7-846c-3d737148a93a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_CashAndCashEquivalents1Member_019e223a-ed78-73b9-887e-f07e011c421f" xlink:href="bip-20260630.xsd#bip_CashAndCashEquivalents1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019e223a-ed78-75e7-846c-3d737148a93a" xlink:to="loc_bip_CashAndCashEquivalents1Member_019e223a-ed78-73b9-887e-f07e011c421f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeReceivablesMember_019e223a-ed78-7804-8177-e1815fda29bd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019e223a-ed78-75e7-846c-3d737148a93a" xlink:to="loc_ifrs-full_TradeReceivablesMember_019e223a-ed78-7804-8177-e1815fda29bd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_OtherFinancialAssetsMember_019e223a-ed78-74a2-9e20-60a67af6bc9f" xlink:href="bip-20260630.xsd#bip_OtherFinancialAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019e223a-ed78-75e7-846c-3d737148a93a" xlink:to="loc_bip_OtherFinancialAssetsMember_019e223a-ed78-74a2-9e20-60a67af6bc9f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_019e223a-ed78-74de-9954-dd9588efbe7c" 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_019e223a-ed78-779d-a182-7082d1026e64" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_019e223a-ed78-74de-9954-dd9588efbe7c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e223a-ed78-74de-9954-dd9588efbe7c_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_019e223a-ed78-74de-9954-dd9588efbe7c" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e223a-ed78-74de-9954-dd9588efbe7c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e223a-ed78-75a1-ae0f-ea224d7f9819" 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_019e223a-ed78-74de-9954-dd9588efbe7c" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e223a-ed78-75a1-ae0f-ea224d7f9819" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember_019e223a-ed78-7c06-a442-730a90bee1a7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e223a-ed78-75a1-ae0f-ea224d7f9819" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughProfitOrLossCategoryMember_019e223a-ed78-7c06-a442-730a90bee1a7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAvailableforsaleCategoryMember_019e223a-ed78-7eaf-a1eb-2d9cd1a5e23b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAvailableforsaleCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e223a-ed78-75a1-ae0f-ea224d7f9819" xlink:to="loc_ifrs-full_FinancialAssetsAvailableforsaleCategoryMember_019e223a-ed78-7eaf-a1eb-2d9cd1a5e23b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_019e223a-ed78-76c0-b6a9-a689698e589c" 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_019e223a-ed78-75a1-ae0f-ea224d7f9819" xlink:to="loc_ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember_019e223a-ed78-76c0-b6a9-a689698e589c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_019e223a-ed78-727a-aed8-d446424246a3" 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_ifrs-full_DisclosureOfFinancialAssetsTable_019e223a-ed78-779d-a182-7082d1026e64" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_019e223a-ed78-727a-aed8-d446424246a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e223a-ed78-727a-aed8-d446424246a3_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_019e223a-ed78-727a-aed8-d446424246a3" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e223a-ed78-727a-aed8-d446424246a3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e223a-ed78-7d33-abf5-95e6788ff37e" 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_019e223a-ed78-727a-aed8-d446424246a3" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e223a-ed78-7d33-abf5-95e6788ff37e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember_019e223a-ed78-7e98-9394-43845afd500b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e223a-ed78-7d33-abf5-95e6788ff37e" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember_019e223a-ed78-7e98-9394-43845afd500b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_FinancialliabilitiesavailableforsalecategoryMember_019e223a-ed78-7213-970e-2c82a0000b17" xlink:href="bip-20260630.xsd#bip_FinancialliabilitiesavailableforsalecategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e223a-ed78-7d33-abf5-95e6788ff37e" xlink:to="loc_bip_FinancialliabilitiesavailableforsalecategoryMember_019e223a-ed78-7213-970e-2c82a0000b17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember_019e223a-ed78-7cbc-a3ba-e51da1665149" 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_019e223a-ed78-7d33-abf5-95e6788ff37e" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember_019e223a-ed78-7cbc-a3ba-e51da1665149" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_019e223a-ed78-7ff3-9db8-19e81f8843f8" 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_ifrs-full_DisclosureOfFinancialAssetsTable_019e223a-ed78-779d-a182-7082d1026e64" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_019e223a-ed78-7ff3-9db8-19e81f8843f8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-7ff3-9db8-19e81f8843f8_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_019e223a-ed78-7ff3-9db8-19e81f8843f8" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-7ff3-9db8-19e81f8843f8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-74e4-833b-aaf763c287c0" 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_019e223a-ed78-7ff3-9db8-19e81f8843f8" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-74e4-833b-aaf763c287c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_CorporateBorrowingsMember_019e223a-ed78-746a-95fc-205169ffec5a" xlink:href="bip-20260630.xsd#bip_CorporateBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-74e4-833b-aaf763c287c0" xlink:to="loc_bip_CorporateBorrowingsMember_019e223a-ed78-746a-95fc-205169ffec5a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonRecourseBorrowingsMember_019e223a-ed78-7bb5-ac64-67278bae8c73" xlink:href="bip-20260630.xsd#bip_NonRecourseBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-74e4-833b-aaf763c287c0" xlink:to="loc_bip_NonRecourseBorrowingsMember_019e223a-ed78-7bb5-ac64-67278bae8c73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_TradeAndOtherPayablesMember_019e223a-ed78-7721-afd7-9154c0ec2d21" xlink:href="bip-20260630.xsd#bip_TradeAndOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-74e4-833b-aaf763c287c0" xlink:to="loc_bip_TradeAndOtherPayablesMember_019e223a-ed78-7721-afd7-9154c0ec2d21" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_OtherFinancialLiabilitiesMember_019e223a-ed78-7f3d-9d2d-33477392fe9d" xlink:href="bip-20260630.xsd#bip_OtherFinancialLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-74e4-833b-aaf763c287c0" xlink:to="loc_bip_OtherFinancialLiabilitiesMember_019e223a-ed78-7f3d-9d2d-33477392fe9d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilitiesMember_019e223a-ed78-7824-9ccc-ba4c6e49b090" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-74e4-833b-aaf763c287c0" xlink:to="loc_ifrs-full_LeaseLiabilitiesMember_019e223a-ed78-7824-9ccc-ba4c6e49b090" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PreferredShareMember_019e223a-ed78-720f-b885-76714a79b044" xlink:href="bip-20260630.xsd#bip_PreferredShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-74e4-833b-aaf763c287c0" xlink:to="loc_bip_PreferredShareMember_019e223a-ed78-720f-b885-76714a79b044" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_FinancialAssetsAndOtherAssets_019e223a-ed78-7031-94c1-45f6bb1a6461" xlink:href="bip-20260630.xsd#bip_FinancialAssetsAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_019e223a-ed78-7aee-b0b4-c3a2e817d67c" xlink:to="loc_bip_FinancialAssetsAndOtherAssets_019e223a-ed78-7031-94c1-45f6bb1a6461" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_FinancialLiabilitiesAndOtherLiabilities_019e223a-ed78-74b6-991b-0c7cb7b140a5" xlink:href="bip-20260630.xsd#bip_FinancialLiabilitiesAndOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_019e223a-ed78-7aee-b0b4-c3a2e817d67c" xlink:to="loc_bip_FinancialLiabilitiesAndOtherLiabilities_019e223a-ed78-74b6-991b-0c7cb7b140a5" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSCarryingandFairValueofFinancialInstrumentsDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#FAIRVALUEOFFINANCIALINSTRUMENTSCarryingandFairValueofFinancialInstrumentsDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSCarryingandFairValueofFinancialInstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_019e223a-ed78-7956-accc-7da347aa366b" 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_019e223a-ed78-7d62-b663-9c767db46272" 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_019e223a-ed78-7956-accc-7da347aa366b" xlink:to="loc_ifrs-full_DisclosureOfFinancialAssetsTable_019e223a-ed78-7d62-b663-9c767db46272" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsAxis_019e223a-ed78-7229-b270-dc173e42ec07" 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_019e223a-ed78-7d62-b663-9c767db46272" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsAxis_019e223a-ed78-7229-b270-dc173e42ec07" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019e223a-ed78-7229-b270-dc173e42ec07_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_019e223a-ed78-7229-b270-dc173e42ec07" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019e223a-ed78-7229-b270-dc173e42ec07_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019e223a-ed78-7704-8f53-360b9b1ffdb1" 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_019e223a-ed78-7229-b270-dc173e42ec07" xlink:to="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019e223a-ed78-7704-8f53-360b9b1ffdb1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_CashAndCashEquivalents1Member_019e223a-ed78-765f-a812-a64ec0b50973" xlink:href="bip-20260630.xsd#bip_CashAndCashEquivalents1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019e223a-ed78-7704-8f53-360b9b1ffdb1" xlink:to="loc_bip_CashAndCashEquivalents1Member_019e223a-ed78-765f-a812-a64ec0b50973" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TradeReceivablesMember_019e223a-ed78-7145-848d-85718d4ca01a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TradeReceivablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019e223a-ed78-7704-8f53-360b9b1ffdb1" xlink:to="loc_ifrs-full_TradeReceivablesMember_019e223a-ed78-7145-848d-85718d4ca01a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_OtherFinancialAssetsMember_019e223a-ed78-7f09-84f9-0c57fc646279" xlink:href="bip-20260630.xsd#bip_OtherFinancialAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialAssetsDomain_019e223a-ed78-7704-8f53-360b9b1ffdb1" xlink:to="loc_bip_OtherFinancialAssetsMember_019e223a-ed78-7f09-84f9-0c57fc646279" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_019e223a-ed78-7e2f-9a7e-6eb3efe86bf4" 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_ifrs-full_DisclosureOfFinancialAssetsTable_019e223a-ed78-7d62-b663-9c767db46272" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesAxis_019e223a-ed78-7e2f-9a7e-6eb3efe86bf4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-7e2f-9a7e-6eb3efe86bf4_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_019e223a-ed78-7e2f-9a7e-6eb3efe86bf4" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-7e2f-9a7e-6eb3efe86bf4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-7d74-b865-e79ce5d54f76" 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_019e223a-ed78-7e2f-9a7e-6eb3efe86bf4" xlink:to="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-7d74-b865-e79ce5d54f76" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_CorporateBorrowingsMember_019e223a-ed78-77ae-ac3f-3f2929886229" xlink:href="bip-20260630.xsd#bip_CorporateBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-7d74-b865-e79ce5d54f76" xlink:to="loc_bip_CorporateBorrowingsMember_019e223a-ed78-77ae-ac3f-3f2929886229" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonRecourseBorrowingsMember_019e223a-ed78-7b4a-b5cd-1ca9b27900b6" xlink:href="bip-20260630.xsd#bip_NonRecourseBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-7d74-b865-e79ce5d54f76" xlink:to="loc_bip_NonRecourseBorrowingsMember_019e223a-ed78-7b4a-b5cd-1ca9b27900b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_TradeAndOtherPayablesMember_019e223a-ed78-7c55-afb4-40c24ddb454c" xlink:href="bip-20260630.xsd#bip_TradeAndOtherPayablesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-7d74-b865-e79ce5d54f76" xlink:to="loc_bip_TradeAndOtherPayablesMember_019e223a-ed78-7c55-afb4-40c24ddb454c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_OtherFinancialLiabilitiesMember_019e223a-ed78-7071-ba9e-26ee54d0aa1b" xlink:href="bip-20260630.xsd#bip_OtherFinancialLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-7d74-b865-e79ce5d54f76" xlink:to="loc_bip_OtherFinancialLiabilitiesMember_019e223a-ed78-7071-ba9e-26ee54d0aa1b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LeaseLiabilitiesMember_019e7372-f65e-794d-a6c6-41f632479e10" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_LeaseLiabilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-7d74-b865-e79ce5d54f76" xlink:to="loc_ifrs-full_LeaseLiabilitiesMember_019e7372-f65e-794d-a6c6-41f632479e10" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PreferredShareMember_019e223a-ed78-72a2-be8a-972d2ac3ae68" xlink:href="bip-20260630.xsd#bip_PreferredShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfFinancialLiabilitiesDomain_019e223a-ed78-7d74-b865-e79ce5d54f76" xlink:to="loc_bip_PreferredShareMember_019e223a-ed78-72a2-be8a-972d2ac3ae68" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_019e7372-f65e-721b-b936-206c67fbb6a1" 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_ifrs-full_DisclosureOfFinancialAssetsTable_019e223a-ed78-7d62-b663-9c767db46272" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_019e7372-f65e-721b-b936-206c67fbb6a1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e7372-f65e-721b-b936-206c67fbb6a1_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_019e7372-f65e-721b-b936-206c67fbb6a1" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e7372-f65e-721b-b936-206c67fbb6a1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e7372-f65e-7541-aa32-6882ff774194" 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_019e7372-f65e-721b-b936-206c67fbb6a1" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e7372-f65e-7541-aa32-6882ff774194" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember_019e7372-f65e-79ef-af2d-b6e77816a774" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e7372-f65e-7541-aa32-6882ff774194" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember_019e7372-f65e-79ef-af2d-b6e77816a774" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_FinancialliabilitiesavailableforsalecategoryMember_019e7372-f65e-76f7-911c-72daf0f97141" xlink:href="bip-20260630.xsd#bip_FinancialliabilitiesavailableforsalecategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e7372-f65e-7541-aa32-6882ff774194" xlink:to="loc_bip_FinancialliabilitiesavailableforsalecategoryMember_019e7372-f65e-76f7-911c-72daf0f97141" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember_019e7372-f65e-78f3-80df-87f8c1627181" 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_019e7372-f65e-7541-aa32-6882ff774194" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember_019e7372-f65e-78f3-80df-87f8c1627181" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueMember_019e7378-f9e6-7c45-b340-edb6ac1b4440" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e7372-f65e-7541-aa32-6882ff774194" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueMember_019e7378-f9e6-7c45-b340-edb6ac1b4440" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_019e7378-f9e6-746b-b6ce-a9662321aa8d" 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_019e223a-ed78-7d62-b663-9c767db46272" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_019e7378-f9e6-746b-b6ce-a9662321aa8d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e7378-f9e6-746b-b6ce-a9662321aa8d_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_019e7378-f9e6-746b-b6ce-a9662321aa8d" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e7378-f9e6-746b-b6ce-a9662321aa8d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e7378-f9e6-7331-8b4f-946475d37a6f" 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_019e7378-f9e6-746b-b6ce-a9662321aa8d" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e7378-f9e6-7331-8b4f-946475d37a6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueMember_019e7378-f9e6-75fe-bb5a-8b94c85c7b23" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValueMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e7378-f9e6-7331-8b4f-946475d37a6f" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueMember_019e7378-f9e6-75fe-bb5a-8b94c85c7b23" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_FinancialAssetsAndOtherAssets_019e223a-ed78-7848-8444-ee5eada95720" xlink:href="bip-20260630.xsd#bip_FinancialAssetsAndOtherAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_019e223a-ed78-7956-accc-7da347aa366b" xlink:to="loc_bip_FinancialAssetsAndOtherAssets_019e223a-ed78-7848-8444-ee5eada95720" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValue_019e223a-ed78-760e-862c-364ae34dd2d2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialAssetsAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_019e223a-ed78-7956-accc-7da347aa366b" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValue_019e223a-ed78-760e-862c-364ae34dd2d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_FinancialLiabilitiesAndOtherLiabilities_019e223a-ed78-7cf4-8cd5-cc7465d47f2f" xlink:href="bip-20260630.xsd#bip_FinancialLiabilitiesAndOtherLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_019e223a-ed78-7956-accc-7da347aa366b" xlink:to="loc_bip_FinancialLiabilitiesAndOtherLiabilities_019e223a-ed78-7cf4-8cd5-cc7465d47f2f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValue_019e223a-ed78-70a2-810d-bb62ba908d7a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_019e223a-ed78-7956-accc-7da347aa366b" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValue_019e223a-ed78-70a2-810d-bb62ba908d7a" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_FinancialLiabilitiesAndOtherLiabilitiesExcludingLeaseLiabilities_019e223a-ed78-7179-aae9-1e4897d265b9" xlink:href="bip-20260630.xsd#bip_FinancialLiabilitiesAndOtherLiabilitiesExcludingLeaseLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_019e223a-ed78-7956-accc-7da347aa366b" xlink:to="loc_bip_FinancialLiabilitiesAndOtherLiabilitiesExcludingLeaseLiabilities_019e223a-ed78-7179-aae9-1e4897d265b9" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PreferredShares_019e223a-ed78-7ab8-a614-63d59066215a" xlink:href="bip-20260630.xsd#bip_PreferredShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfFinancialAssetsLineItems_019e223a-ed78-7956-accc-7da347aa366b" xlink:to="loc_bip_PreferredShares_019e223a-ed78-7ab8-a614-63d59066215a" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSAdditionalInformationDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#FAIRVALUEOFFINANCIALINSTRUMENTSAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_019e223a-ed78-7556-ba0c-53e57bf6a5dd" xlink:href="bip-20260630.xsd#bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_019e223a-ed78-776f-9b1f-b0bfa1e28b86" xlink:href="bip-20260630.xsd#bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_019e223a-ed78-7556-ba0c-53e57bf6a5dd" xlink:to="loc_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_019e223a-ed78-776f-9b1f-b0bfa1e28b86" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_019e223a-ed78-7692-b47d-37f8ab35ea39" 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_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_019e223a-ed78-776f-9b1f-b0bfa1e28b86" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsAxis_019e223a-ed78-7692-b47d-37f8ab35ea39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e223a-ed78-7692-b47d-37f8ab35ea39_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_019e223a-ed78-7692-b47d-37f8ab35ea39" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e223a-ed78-7692-b47d-37f8ab35ea39_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e223a-ed78-7e20-843c-15cf88eb7aeb" 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_019e223a-ed78-7692-b47d-37f8ab35ea39" xlink:to="loc_ifrs-full_CategoriesOfFinancialAssetsDomain_019e223a-ed78-7e20-843c-15cf88eb7aeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_019e223a-ed78-7a85-a8e9-29d3b8c1023f" 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_019e223a-ed78-7e20-843c-15cf88eb7aeb" xlink:to="loc_ifrs-full_FinancialAssetsAtFairValueThroughOtherComprehensiveIncomeCategoryMember_019e223a-ed78-7a85-a8e9-29d3b8c1023f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfHedgesAxis_019e223a-ed78-7fa2-ac9c-5247df6822e4" 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_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_019e223a-ed78-776f-9b1f-b0bfa1e28b86" xlink:to="loc_ifrs-full_TypesOfHedgesAxis_019e223a-ed78-7fa2-ac9c-5247df6822e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfHedgesDomain_019e223a-ed78-7fa2-ac9c-5247df6822e4_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_019e223a-ed78-7fa2-ac9c-5247df6822e4" xlink:to="loc_ifrs-full_TypesOfHedgesDomain_019e223a-ed78-7fa2-ac9c-5247df6822e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfHedgesDomain_019e223a-ed78-7463-b8b6-e82261449beb" 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_019e223a-ed78-7fa2-ac9c-5247df6822e4" xlink:to="loc_ifrs-full_TypesOfHedgesDomain_019e223a-ed78-7463-b8b6-e82261449beb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CashFlowHedgesMember_019e223a-ed78-742a-938c-e3cfe316b154" 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_019e223a-ed78-7463-b8b6-e82261449beb" xlink:to="loc_ifrs-full_CashFlowHedgesMember_019e223a-ed78-742a-938c-e3cfe316b154" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_HedgesOfNetInvestmentInForeignOperationsMember_019e223a-ed78-7eae-be27-075cade41a3c" 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_019e223a-ed78-7463-b8b6-e82261449beb" xlink:to="loc_ifrs-full_HedgesOfNetInvestmentInForeignOperationsMember_019e223a-ed78-7eae-be27-075cade41a3c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_019e7377-be3f-725f-84be-8252e1ceeacf" 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_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_019e223a-ed78-776f-9b1f-b0bfa1e28b86" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesAxis_019e7377-be3f-725f-84be-8252e1ceeacf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e7377-be3f-725f-84be-8252e1ceeacf_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_019e7377-be3f-725f-84be-8252e1ceeacf" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e7377-be3f-725f-84be-8252e1ceeacf_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e7377-be3f-748b-96ae-8d89e0b9079f" 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_019e7377-be3f-725f-84be-8252e1ceeacf" xlink:to="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e7377-be3f-748b-96ae-8d89e0b9079f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember_019e7377-be3f-7ec2-bb5e-8254143c53eb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfFinancialLiabilitiesDomain_019e7377-be3f-748b-96ae-8d89e0b9079f" xlink:to="loc_ifrs-full_FinancialLiabilitiesAtFairValueThroughProfitOrLossCategoryMember_019e7377-be3f-7ec2-bb5e-8254143c53eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxCashFlowHedges_019e223a-ed78-71ce-9b4b-ff700bcde304" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxCashFlowHedges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_019e223a-ed78-7556-ba0c-53e57bf6a5dd" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxCashFlowHedges_019e223a-ed78-71ce-9b4b-ff700bcde304" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativeFinancialLiabilities_019e223a-ed78-7193-b67f-600abae2ca25" 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_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_019e223a-ed78-7556-ba0c-53e57bf6a5dd" xlink:to="loc_ifrs-full_DerivativeFinancialLiabilities_019e223a-ed78-7193-b67f-600abae2ca25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DerivativeFinancialAssets_019e223a-ed78-7935-be4c-ad1a82c6b50e" 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_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_019e223a-ed78-7556-ba0c-53e57bf6a5dd" xlink:to="loc_ifrs-full_DerivativeFinancialAssets_019e223a-ed78-7935-be4c-ad1a82c6b50e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxHedgesOfNetInvestmentsInForeignOperations_019e223a-ed78-7dfc-9cd8-12d460286225" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_OtherComprehensiveIncomeBeforeTaxHedgesOfNetInvestmentsInForeignOperations"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_019e223a-ed78-7556-ba0c-53e57bf6a5dd" xlink:to="loc_ifrs-full_OtherComprehensiveIncomeBeforeTaxHedgesOfNetInvestmentsInForeignOperations_019e223a-ed78-7dfc-9cd8-12d460286225" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SettlementsFairValueMeasurementLiabilities_019e223a-ed78-72cf-8b4e-bb737ff1ea9b" 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_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_019e223a-ed78-7556-ba0c-53e57bf6a5dd" xlink:to="loc_ifrs-full_SettlementsFairValueMeasurementLiabilities_019e223a-ed78-72cf-8b4e-bb737ff1ea9b" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSValuationTechniquesandSignificantInputsDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#FAIRVALUEOFFINANCIALINSTRUMENTSValuationTechniquesandSignificantInputsDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/FAIRVALUEOFFINANCIALINSTRUMENTSValuationTechniquesandSignificantInputsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_019e223a-ed78-7e11-914d-fb962561c5d9" xlink:href="bip-20260630.xsd#bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_019e223a-ed78-7416-8982-d543d332692c" xlink:href="bip-20260630.xsd#bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_019e223a-ed78-7e11-914d-fb962561c5d9" xlink:to="loc_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_019e223a-ed78-7416-8982-d543d332692c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementAxis_019e223a-ed78-772d-bdb4-489762053fb4" 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_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_019e223a-ed78-7416-8982-d543d332692c" xlink:to="loc_ifrs-full_MeasurementAxis_019e223a-ed78-772d-bdb4-489762053fb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementDomain_019e223a-ed78-772d-bdb4-489762053fb4_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_019e223a-ed78-772d-bdb4-489762053fb4" xlink:to="loc_ifrs-full_MeasurementDomain_019e223a-ed78-772d-bdb4-489762053fb4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_MeasurementDomain_019e223a-ed78-7412-9e81-661e40497160" 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_019e223a-ed78-772d-bdb4-489762053fb4" xlink:to="loc_ifrs-full_MeasurementDomain_019e223a-ed78-7412-9e81-661e40497160" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RecurringFairValueMeasurementMember_019e223a-ed78-79e2-b222-7070c2b44196" 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_019e223a-ed78-7412-9e81-661e40497160" xlink:to="loc_ifrs-full_RecurringFairValueMeasurementMember_019e223a-ed78-79e2-b222-7070c2b44196" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsAxis_019e223a-ed78-7c58-9edd-66c03b046866" 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_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_019e223a-ed78-7416-8982-d543d332692c" xlink:to="loc_ifrs-full_ClassesOfAssetsAxis_019e223a-ed78-7c58-9edd-66c03b046866" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsDomain_019e223a-ed78-7c58-9edd-66c03b046866_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_019e223a-ed78-7c58-9edd-66c03b046866" xlink:to="loc_ifrs-full_ClassesOfAssetsDomain_019e223a-ed78-7c58-9edd-66c03b046866_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfAssetsDomain_019e223a-ed78-7ea0-ab11-aba88ca69379" 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_019e223a-ed78-7c58-9edd-66c03b046866" xlink:to="loc_ifrs-full_ClassesOfAssetsDomain_019e223a-ed78-7ea0-ab11-aba88ca69379" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MarketablesecuritiesMember_019e223a-ed78-7eed-b686-1e3dd1d741b4" xlink:href="bip-20260630.xsd#bip_MarketablesecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_019e223a-ed78-7ea0-ab11-aba88ca69379" xlink:to="loc_bip_MarketablesecuritiesMember_019e223a-ed78-7eed-b686-1e3dd1d741b4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ForwardContractMember_019e223a-ed78-7639-b01e-dcce06011b78" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ForwardContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_019e223a-ed78-7ea0-ab11-aba88ca69379" xlink:to="loc_ifrs-full_ForwardContractMember_019e223a-ed78-7639-b01e-dcce06011b78" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestRateSwapContractMember_019e223a-ed78-7dae-b3a4-160bc6a31c92" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRateSwapContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_019e223a-ed78-7ea0-ab11-aba88ca69379" xlink:to="loc_ifrs-full_InterestRateSwapContractMember_019e223a-ed78-7dae-b3a4-160bc6a31c92" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_OtherDerivativeContractMember_019e223a-ed78-76a4-8c69-3976de3746a6" xlink:href="bip-20260630.xsd#bip_OtherDerivativeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfAssetsDomain_019e223a-ed78-7ea0-ab11-aba88ca69379" xlink:to="loc_bip_OtherDerivativeContractMember_019e223a-ed78-76a4-8c69-3976de3746a6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesAxis_019e223a-ed78-7c12-b65f-85b5b160f3ef" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfLiabilitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_019e223a-ed78-7416-8982-d543d332692c" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesAxis_019e223a-ed78-7c12-b65f-85b5b160f3ef" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesDomain_019e223a-ed78-7c12-b65f-85b5b160f3ef_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesAxis_019e223a-ed78-7c12-b65f-85b5b160f3ef" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesDomain_019e223a-ed78-7c12-b65f-85b5b160f3ef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfLiabilitiesDomain_019e223a-ed78-7376-b4eb-5f498992638f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ClassesOfLiabilitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesAxis_019e223a-ed78-7c12-b65f-85b5b160f3ef" xlink:to="loc_ifrs-full_ClassesOfLiabilitiesDomain_019e223a-ed78-7376-b4eb-5f498992638f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ForwardContractMember_019e223a-ed78-7b65-aae9-3359e3ef923d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ForwardContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_019e223a-ed78-7376-b4eb-5f498992638f" xlink:to="loc_ifrs-full_ForwardContractMember_019e223a-ed78-7b65-aae9-3359e3ef923d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InterestRateSwapContractMember_019e223a-ed78-7408-93f7-982acc656343" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InterestRateSwapContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_019e223a-ed78-7376-b4eb-5f498992638f" xlink:to="loc_ifrs-full_InterestRateSwapContractMember_019e223a-ed78-7408-93f7-982acc656343" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_OtherDerivativeContractMember_019e223a-ed78-7163-9313-c4f73ace92aa" xlink:href="bip-20260630.xsd#bip_OtherDerivativeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfLiabilitiesDomain_019e223a-ed78-7376-b4eb-5f498992638f" xlink:to="loc_bip_OtherDerivativeContractMember_019e223a-ed78-7163-9313-c4f73ace92aa" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_019e223a-ed78-7b18-a734-0c25a55aa77c" 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_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_019e223a-ed78-7416-8982-d543d332692c" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyAxis_019e223a-ed78-7b18-a734-0c25a55aa77c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_019e223a-ed78-7b18-a734-0c25a55aa77c_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_019e223a-ed78-7b18-a734-0c25a55aa77c" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_019e223a-ed78-7b18-a734-0c25a55aa77c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_019e223a-ed78-7f18-83a3-8af58556b533" 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_019e223a-ed78-7b18-a734-0c25a55aa77c" xlink:to="loc_ifrs-full_LevelsOfFairValueHierarchyDomain_019e223a-ed78-7f18-83a3-8af58556b533" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level1OfFairValueHierarchyMember_019e223a-ed78-7771-9e21-8cf5ea477dcf" 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_019e223a-ed78-7f18-83a3-8af58556b533" xlink:to="loc_ifrs-full_Level1OfFairValueHierarchyMember_019e223a-ed78-7771-9e21-8cf5ea477dcf" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level2OfFairValueHierarchyMember_019e223a-ed78-78dd-b9a7-81c4274b08bf" 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_019e223a-ed78-7f18-83a3-8af58556b533" xlink:to="loc_ifrs-full_Level2OfFairValueHierarchyMember_019e223a-ed78-78dd-b9a7-81c4274b08bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Level3OfFairValueHierarchyMember_019e223a-ed78-7a0f-b68c-6b06fa8c3443" 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_019e223a-ed78-7f18-83a3-8af58556b533" xlink:to="loc_ifrs-full_Level3OfFairValueHierarchyMember_019e223a-ed78-7a0f-b68c-6b06fa8c3443" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementAxis_019e223a-ed78-7c7a-8712-7211734c2ad2" 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_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesTable_019e223a-ed78-7416-8982-d543d332692c" xlink:to="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementAxis_019e223a-ed78-7c7a-8712-7211734c2ad2" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain_019e223a-ed78-7c7a-8712-7211734c2ad2_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_019e223a-ed78-7c7a-8712-7211734c2ad2" xlink:to="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain_019e223a-ed78-7c7a-8712-7211734c2ad2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain_019e223a-ed78-7580-bab0-f6a8c2fe3a59" 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_019e223a-ed78-7c7a-8712-7211734c2ad2" xlink:to="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain_019e223a-ed78-7580-bab0-f6a8c2fe3a59" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ConsensusPricingMember_019e223a-ed78-7d94-bf62-d1b189ca339f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ConsensusPricingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ValuationTechniquesUsedInFairValueMeasurementDomain_019e223a-ed78-7580-bab0-f6a8c2fe3a59" xlink:to="loc_ifrs-full_ConsensusPricingMember_019e223a-ed78-7d94-bf62-d1b189ca339f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DiscountedCashFlowMember_019e223a-ed78-7c68-ada3-a7181c3e1101" 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_019e223a-ed78-7580-bab0-f6a8c2fe3a59" xlink:to="loc_ifrs-full_DiscountedCashFlowMember_019e223a-ed78-7c68-ada3-a7181c3e1101" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialAssets_019e223a-ed78-7d8b-a9ea-38ff6bc0ea28" 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_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_019e223a-ed78-7e11-914d-fb962561c5d9" xlink:to="loc_ifrs-full_FinancialAssets_019e223a-ed78-7d8b-a9ea-38ff6bc0ea28" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FinancialLiabilities_019e223a-ed78-7a96-bf16-e2f87a90182f" 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_bip_DisclosureOfFairValueMeasurementOfAssetsAndLiabilitiesLineItems_019e223a-ed78-7e11-914d-fb962561c5d9" xlink:to="loc_ifrs-full_FinancialLiabilities_019e223a-ed78-7a96-bf16-e2f87a90182f" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/PROPERTYPLANTANDEQUIPMENTDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#PROPERTYPLANTANDEQUIPMENTDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/PROPERTYPLANTANDEQUIPMENTDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_019e223a-ed78-7a14-9e4f-8a0d219d7bab" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_019e223a-ed78-782d-b0b1-e136b4a4e8dd" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_019e223a-ed78-7a14-9e4f-8a0d219d7bab" xlink:to="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentTable_019e223a-ed78-782d-b0b1-e136b4a4e8dd" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019e223a-ed78-779d-ac59-d97870f6f5f3" 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_DisclosureOfPropertyPlantAndEquipmentTable_019e223a-ed78-782d-b0b1-e136b4a4e8dd" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019e223a-ed78-779d-ac59-d97870f6f5f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-779d-ac59-d97870f6f5f3_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_019e223a-ed78-779d-ac59-d97870f6f5f3" xlink:to="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-779d-ac59-d97870f6f5f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-7c12-8176-45ab213296bf" 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_019e223a-ed78-779d-ac59-d97870f6f5f3" xlink:to="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-7c12-8176-45ab213296bf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_019e223a-ed78-7380-8f3c-8c9cc19572e4" 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_019e223a-ed78-7c12-8176-45ab213296bf" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_019e223a-ed78-7380-8f3c-8c9cc19572e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember_019e223a-ed78-7bee-80ea-d8829e344823" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedDepreciationAndAmortisationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-7c12-8176-45ab213296bf" xlink:to="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember_019e223a-ed78-7bee-80ea-d8829e344823" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AccumulatedFairValueAdjustmentsMember_019e223a-ed78-7132-a8aa-a6d557f13251" xlink:href="bip-20260630.xsd#bip_AccumulatedFairValueAdjustmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-7c12-8176-45ab213296bf" xlink:to="loc_bip_AccumulatedFairValueAdjustmentsMember_019e223a-ed78-7132-a8aa-a6d557f13251" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsAxis_019e223a-ed78-76b2-9b9b-ae2d8c42cc96" 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_DisclosureOfPropertyPlantAndEquipmentTable_019e223a-ed78-782d-b0b1-e136b4a4e8dd" xlink:to="loc_ifrs-full_SegmentsAxis_019e223a-ed78-76b2-9b9b-ae2d8c42cc96" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_019e223a-ed78-76b2-9b9b-ae2d8c42cc96_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_019e223a-ed78-76b2-9b9b-ae2d8c42cc96" xlink:to="loc_ifrs-full_SegmentsDomain_019e223a-ed78-76b2-9b9b-ae2d8c42cc96_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_019e223a-ed78-757a-bb1d-7ef0e04d35b6" 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_019e223a-ed78-76b2-9b9b-ae2d8c42cc96" xlink:to="loc_ifrs-full_SegmentsDomain_019e223a-ed78-757a-bb1d-7ef0e04d35b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_UtilitiesMember_019e223a-ed78-76bf-896a-36087a4c65ac" xlink:href="bip-20260630.xsd#bip_UtilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ed78-757a-bb1d-7ef0e04d35b6" xlink:to="loc_bip_UtilitiesMember_019e223a-ed78-76bf-896a-36087a4c65ac" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_TransportMember_019e223a-ed78-7f4c-b99c-4545f0d5b70a" xlink:href="bip-20260630.xsd#bip_TransportMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ed78-757a-bb1d-7ef0e04d35b6" xlink:to="loc_bip_TransportMember_019e223a-ed78-7f4c-b99c-4545f0d5b70a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MidstreamMember_019e223a-ed78-7c59-ac1c-06a42402ca16" xlink:href="bip-20260630.xsd#bip_MidstreamMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ed78-757a-bb1d-7ef0e04d35b6" xlink:to="loc_bip_MidstreamMember_019e223a-ed78-7c59-ac1c-06a42402ca16" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DataMember_019e223a-ed78-7a28-9f67-c6e230ec38cc" xlink:href="bip-20260630.xsd#bip_DataMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ed78-757a-bb1d-7ef0e04d35b6" xlink:to="loc_bip_DataMember_019e223a-ed78-7a28-9f67-c6e230ec38cc" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019e223a-ed78-7568-b561-6ba9aeab9eb3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_019e223a-ed78-7a14-9e4f-8a0d219d7bab" xlink:to="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019e223a-ed78-7568-b561-6ba9aeab9eb3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets_019e223a-ed78-7a7c-aa84-3ba1a7070e22" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019e223a-ed78-7568-b561-6ba9aeab9eb3" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets_019e223a-ed78-7a7c-aa84-3ba1a7070e22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment_019e223a-ed78-7f1f-8f9d-362e7fb87549" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019e223a-ed78-7568-b561-6ba9aeab9eb3" xlink:to="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsPropertyPlantAndEquipment_019e223a-ed78-7f1f-8f9d-362e7fb87549" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_019e223a-ed78-782b-86dd-4b8cb5c4b180" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019e223a-ed78-7568-b561-6ba9aeab9eb3" xlink:to="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsPropertyPlantAndEquipment_019e223a-ed78-782b-86dd-4b8cb5c4b180" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DecreaseThroughClassifiedAsHeldForSalePropertyPlantAndEquipment_019e223a-ed78-732f-a0d1-3c52d5e48d39" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DecreaseThroughClassifiedAsHeldForSalePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019e223a-ed78-7568-b561-6ba9aeab9eb3" xlink:to="loc_ifrs-full_DecreaseThroughClassifiedAsHeldForSalePropertyPlantAndEquipment_019e223a-ed78-732f-a0d1-3c52d5e48d39" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonCashDisposalsAdditionstoPropertyPlantAndEquipment_019e223a-ed78-775b-b4e1-b47474924b06" xlink:href="bip-20260630.xsd#bip_NonCashDisposalsAdditionstoPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019e223a-ed78-7568-b561-6ba9aeab9eb3" xlink:to="loc_bip_NonCashDisposalsAdditionstoPropertyPlantAndEquipment_019e223a-ed78-775b-b4e1-b47474924b06" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssetsReclassifiedAsHeldForSale_019e223a-ed78-738b-835e-15d73b32a2b0" xlink:href="bip-20260630.xsd#bip_AssetsReclassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019e223a-ed78-7568-b561-6ba9aeab9eb3" xlink:to="loc_bip_AssetsReclassifiedAsHeldForSale_019e223a-ed78-738b-835e-15d73b32a2b0" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment_019e223a-ed78-7a21-9513-2cb9699c8f3b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019e223a-ed78-7568-b561-6ba9aeab9eb3" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesPropertyPlantAndEquipment_019e223a-ed78-7a21-9513-2cb9699c8f3b" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DepreciationPropertyPlantAndEquipment_019e223a-ed78-7f4f-aaa3-f904d7d318d7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DepreciationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019e223a-ed78-7568-b561-6ba9aeab9eb3" xlink:to="loc_ifrs-full_DepreciationPropertyPlantAndEquipment_019e223a-ed78-7f4f-aaa3-f904d7d318d7" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisposalsPropertyPlantAndEquipment_019e223a-ed78-7ad1-893d-b0e9d4f3fb90" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisposalsPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019e223a-ed78-7568-b561-6ba9aeab9eb3" xlink:to="loc_ifrs-full_DisposalsPropertyPlantAndEquipment_019e223a-ed78-7ad1-893d-b0e9d4f3fb90" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevaluationIncreaseDecreasePropertyPlantAndEquipment_019e223a-ed78-77a1-be9b-1310c981b259" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevaluationIncreaseDecreasePropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInPropertyPlantAndEquipmentAbstract_019e223a-ed78-7568-b561-6ba9aeab9eb3" xlink:to="loc_ifrs-full_RevaluationIncreaseDecreasePropertyPlantAndEquipment_019e223a-ed78-77a1-be9b-1310c981b259" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets_019e223a-ed78-7ab5-abc0-458a3562cc41" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_019f4048-8c39-708f-9614-c8dcf1f60499" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_019e223a-ed78-7a14-9e4f-8a0d219d7bab" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentRecognisedAsOfAcquisitionDate_019f4048-8c39-708f-9614-c8dcf1f60499" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ChangesInPropertyPlantAndEquipment_019f4047-e6fe-746f-96bc-5eefe5f254a7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ChangesInPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_019e223a-ed78-7a14-9e4f-8a0d219d7bab" xlink:to="loc_ifrs-full_ChangesInPropertyPlantAndEquipment_019f4047-e6fe-746f-96bc-5eefe5f254a7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RightofuseAssets_019e223a-ed78-7ab8-9a97-0d5d3a9e90ed" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_019e223a-ed78-7a14-9e4f-8a0d219d7bab" xlink:to="loc_ifrs-full_RightofuseAssets_019e223a-ed78-7ab8-9a97-0d5d3a9e90ed" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLeaseLiabilities_019e223a-ed78-75fe-8320-36a85b0a4750" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentLeaseLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_019e223a-ed78-7a14-9e4f-8a0d219d7bab" xlink:to="loc_ifrs-full_CurrentLeaseLiabilities_019e223a-ed78-75fe-8320-36a85b0a4750" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLeaseLiabilities_019e223a-ed78-7dba-8fca-82df44450e04" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentLeaseLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfPropertyPlantAndEquipmentLineItems_019e223a-ed78-7a14-9e4f-8a0d219d7bab" xlink:to="loc_ifrs-full_NoncurrentLeaseLiabilities_019e223a-ed78-7dba-8fca-82df44450e04" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/INTANGIBLEASSETSNetAmountsDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#INTANGIBLEASSETSNetAmountsDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/INTANGIBLEASSETSNetAmountsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-79dc-bb75-07b1fadc450e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_019e223a-ed78-7a4f-9683-1636b5abc062" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-79dc-bb75-07b1fadc450e" xlink:to="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_019e223a-ed78-7a4f-9683-1636b5abc062" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019e223a-ed78-72eb-a75c-430639f6bd39" 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_DisclosureOfIntangibleAssetsTable_019e223a-ed78-7a4f-9683-1636b5abc062" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019e223a-ed78-72eb-a75c-430639f6bd39" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-72eb-a75c-430639f6bd39_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_019e223a-ed78-72eb-a75c-430639f6bd39" xlink:to="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-72eb-a75c-430639f6bd39_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-7ffb-af9e-31244984a03f" 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_019e223a-ed78-72eb-a75c-430639f6bd39" xlink:to="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-7ffb-af9e-31244984a03f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_019e223a-ed78-7ddc-8e76-1e6f8c42a465" 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_019e223a-ed78-7ffb-af9e-31244984a03f" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_019e223a-ed78-7ddc-8e76-1e6f8c42a465" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember_019e223a-ed78-7dfe-9e45-f48c3f40c6c6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedDepreciationAndAmortisationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-7ffb-af9e-31244984a03f" xlink:to="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember_019e223a-ed78-7dfe-9e45-f48c3f40c6c6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019e223a-ed78-71b5-b3b2-ffe94162987d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-79dc-bb75-07b1fadc450e" xlink:to="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019e223a-ed78-71b5-b3b2-ffe94162987d" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/INTANGIBLEASSETSCashGeneratingUnitsDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#INTANGIBLEASSETSCashGeneratingUnitsDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/INTANGIBLEASSETSCashGeneratingUnitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesLineItems_019e223a-ed78-7738-9d26-fe0490bd524d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesTable_019e223a-ed78-73d8-afaf-3bea8882b120" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesLineItems_019e223a-ed78-7738-9d26-fe0490bd524d" xlink:to="loc_ifrs-full_DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesTable_019e223a-ed78-73d8-afaf-3bea8882b120" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis_019e223a-ed78-70a3-b4f1-eecb7739da53" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesTable_019e223a-ed78-73d8-afaf-3bea8882b120" xlink:to="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis_019e223a-ed78-70a3-b4f1-eecb7739da53" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-70a3-b4f1-eecb7739da53_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis_019e223a-ed78-70a3-b4f1-eecb7739da53" xlink:to="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-70a3-b4f1-eecb7739da53_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-7d96-8cbd-689b4fbd701b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesAxis_019e223a-ed78-70a3-b4f1-eecb7739da53" xlink:to="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-7d96-8cbd-689b4fbd701b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NorthAmericanResidentialEnergyInfrastructureOperationMember_019e223a-ed78-7f84-bbcc-c5258f1fe865" xlink:href="bip-20260630.xsd#bip_NorthAmericanResidentialEnergyInfrastructureOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-7d96-8cbd-689b4fbd701b" xlink:to="loc_bip_NorthAmericanResidentialEnergyInfrastructureOperationMember_019e223a-ed78-7f84-bbcc-c5258f1fe865" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BrazilianRegulatedGasTransmissionOperationMember_019e223a-ed78-7ab0-ba34-b8fcfa4e355c" xlink:href="bip-20260630.xsd#bip_BrazilianRegulatedGasTransmissionOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-7d96-8cbd-689b4fbd701b" xlink:to="loc_bip_BrazilianRegulatedGasTransmissionOperationMember_019e223a-ed78-7ab0-ba34-b8fcfa4e355c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_CanadianDiversifiedMidstreamOperationMember_019e223a-ed78-786c-9c77-db5a915e2037" xlink:href="bip-20260630.xsd#bip_CanadianDiversifiedMidstreamOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-7d96-8cbd-689b4fbd701b" xlink:to="loc_bip_CanadianDiversifiedMidstreamOperationMember_019e223a-ed78-786c-9c77-db5a915e2037" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NorthAmericanRailOperationMember_019e223a-ed78-7db4-a8c4-43ff5650236b" xlink:href="bip-20260630.xsd#bip_NorthAmericanRailOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-7d96-8cbd-689b4fbd701b" xlink:to="loc_bip_NorthAmericanRailOperationMember_019e223a-ed78-7db4-a8c4-43ff5650236b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BrazilianElectricityTransmissionOperationMember_019e223a-ed78-734e-a037-77f6d2735177" xlink:href="bip-20260630.xsd#bip_BrazilianElectricityTransmissionOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-7d96-8cbd-689b4fbd701b" xlink:to="loc_bip_BrazilianElectricityTransmissionOperationMember_019e223a-ed78-734e-a037-77f6d2735177" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_EuropeanResidentialDecarbonizationInfrastructureBusinessMember_019e223a-ed78-732a-b78c-e20775edad54" xlink:href="bip-20260630.xsd#bip_EuropeanResidentialDecarbonizationInfrastructureBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-7d96-8cbd-689b4fbd701b" xlink:to="loc_bip_EuropeanResidentialDecarbonizationInfrastructureBusinessMember_019e223a-ed78-732a-b78c-e20775edad54" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_IndianTelecomTowersOperationMember_019e223a-ed78-72ae-b00b-ad0f9404e408" xlink:href="bip-20260630.xsd#bip_IndianTelecomTowersOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-7d96-8cbd-689b4fbd701b" xlink:to="loc_bip_IndianTelecomTowersOperationMember_019e223a-ed78-72ae-b00b-ad0f9404e408" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.S.BulkFiberNetworkMember_019f5f99-b511-796a-adc1-30a2b6ffa0b2" xlink:href="bip-20260630.xsd#bip_U.S.BulkFiberNetworkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-7d96-8cbd-689b4fbd701b" xlink:to="loc_bip_U.S.BulkFiberNetworkMember_019f5f99-b511-796a-adc1-30a2b6ffa0b2" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_GlobalIntermodalLogisticsOperationMember_019e223a-ed78-7d03-a7e8-be40cc087c48" xlink:href="bip-20260630.xsd#bip_GlobalIntermodalLogisticsOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-7d96-8cbd-689b4fbd701b" xlink:to="loc_bip_GlobalIntermodalLogisticsOperationMember_019e223a-ed78-7d03-a7e8-be40cc087c48" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.K.TelecomTowersOperationMember_019e223a-ed78-7376-8ef0-900af9ba12ab" xlink:href="bip-20260630.xsd#bip_U.K.TelecomTowersOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-7d96-8cbd-689b4fbd701b" xlink:to="loc_bip_U.K.TelecomTowersOperationMember_019e223a-ed78-7376-8ef0-900af9ba12ab" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NorthAmericanRetailColocationDataCenterOperationMember_019e223a-ed78-7aab-920c-ef90f8a85c32" xlink:href="bip-20260630.xsd#bip_NorthAmericanRetailColocationDataCenterOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-7d96-8cbd-689b4fbd701b" xlink:to="loc_bip_NorthAmericanRetailColocationDataCenterOperationMember_019e223a-ed78-7aab-920c-ef90f8a85c32" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AggregateNotSignificantIndividualAssetsOrCashgeneratingUnitsMember_019e223a-ed78-78dc-a345-9612ebb40adf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AggregateNotSignificantIndividualAssetsOrCashgeneratingUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_IndividualAssetsOrCashgeneratingUnitsWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesDomain_019e223a-ed78-7d96-8cbd-689b4fbd701b" xlink:to="loc_ifrs-full_AggregateNotSignificantIndividualAssetsOrCashgeneratingUnitsMember_019e223a-ed78-78dc-a345-9612ebb40adf" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019e223a-ed78-79ed-bfa5-878abaabc394" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInformationForIndividualAssetOrCashgeneratingUnitWithSignificantAmountOfGoodwillOrIntangibleAssetsWithIndefiniteUsefulLivesLineItems_019e223a-ed78-7738-9d26-fe0490bd524d" xlink:to="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019e223a-ed78-79ed-bfa5-878abaabc394" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/INTANGIBLEASSETSReconciliationDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#INTANGIBLEASSETSReconciliationDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/INTANGIBLEASSETSReconciliationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-7a6b-939c-171a27558dc8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_019e223a-ed78-73b0-b8b9-1e8b0eb52972" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-7a6b-939c-171a27558dc8" xlink:to="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_019e223a-ed78-73b0-b8b9-1e8b0eb52972" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019e223a-ed78-7c05-83d0-b2aabcaa8577" 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_DisclosureOfIntangibleAssetsTable_019e223a-ed78-73b0-b8b9-1e8b0eb52972" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019e223a-ed78-7c05-83d0-b2aabcaa8577" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-7c05-83d0-b2aabcaa8577_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_019e223a-ed78-7c05-83d0-b2aabcaa8577" xlink:to="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-7c05-83d0-b2aabcaa8577_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-75fe-997f-fbd3b5eee267" 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_019e223a-ed78-7c05-83d0-b2aabcaa8577" xlink:to="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-75fe-997f-fbd3b5eee267" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GrossCarryingAmountMember_019e223a-ed78-7257-abbe-f31b7e612543" 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_019e223a-ed78-75fe-997f-fbd3b5eee267" xlink:to="loc_ifrs-full_GrossCarryingAmountMember_019e223a-ed78-7257-abbe-f31b7e612543" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019e223a-ed78-7334-ae44-66ed8dad5856" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-7a6b-939c-171a27558dc8" xlink:to="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019e223a-ed78-7334-ae44-66ed8dad5856" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019e223a-ed78-78a1-a121-f2e73e5f40b8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019e223a-ed78-7334-ae44-66ed8dad5856" xlink:to="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019e223a-ed78-78a1-a121-f2e73e5f40b8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill_019e223a-ed78-7681-8cee-209517485b44" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019e223a-ed78-7334-ae44-66ed8dad5856" xlink:to="loc_ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill_019e223a-ed78-7681-8cee-209517485b44" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill_019e223a-ed78-71cb-8436-aed2b46824b7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019e223a-ed78-7334-ae44-66ed8dad5856" xlink:to="loc_ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill_019e223a-ed78-71cb-8436-aed2b46824b7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_IntangibleAssetsReclassifiedAsHeldForSale_019e223a-ed78-7c50-a5b3-a89a8e1acf60" xlink:href="bip-20260630.xsd#bip_IntangibleAssetsReclassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019e223a-ed78-7334-ae44-66ed8dad5856" xlink:to="loc_bip_IntangibleAssetsReclassifiedAsHeldForSale_019e223a-ed78-7c50-a5b3-a89a8e1acf60" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DecreaseThroughClassifiedAsHeldForSaleIntangibleAssetsOtherThanGoodwill_019e223a-ed78-7aeb-9c10-5fec5b786bf9" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DecreaseThroughClassifiedAsHeldForSaleIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019e223a-ed78-7334-ae44-66ed8dad5856" xlink:to="loc_ifrs-full_DecreaseThroughClassifiedAsHeldForSaleIntangibleAssetsOtherThanGoodwill_019e223a-ed78-7aeb-9c10-5fec5b786bf9" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_Noncashadditionsintangibleassetsotherthangoodwill_019e223a-ed78-77ca-9464-0a7a242912ec" xlink:href="bip-20260630.xsd#bip_Noncashadditionsintangibleassetsotherthangoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019e223a-ed78-7334-ae44-66ed8dad5856" xlink:to="loc_bip_Noncashadditionsintangibleassetsotherthangoodwill_019e223a-ed78-77ca-9464-0a7a242912ec" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsOtherThanGoodwill_019e223a-ed78-7781-b72a-180e9d6fd9e7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract_019e223a-ed78-7334-ae44-66ed8dad5856" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsOtherThanGoodwill_019e223a-ed78-7781-b72a-180e9d6fd9e7" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019e223a-ed78-7275-aec1-78686ad841f8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/INTANGIBLEASSETSAccumulatedAmortizationDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#INTANGIBLEASSETSAccumulatedAmortizationDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/INTANGIBLEASSETSAccumulatedAmortizationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-7b60-b540-640b426112c1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_019e223a-ed78-7846-963e-685b5ee01d7c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-7b60-b540-640b426112c1" xlink:to="loc_ifrs-full_DisclosureOfIntangibleAssetsTable_019e223a-ed78-7846-963e-685b5ee01d7c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019e223a-ed78-791a-989d-306102e364c7" 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_DisclosureOfIntangibleAssetsTable_019e223a-ed78-7846-963e-685b5ee01d7c" xlink:to="loc_ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis_019e223a-ed78-791a-989d-306102e364c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-791a-989d-306102e364c7_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_019e223a-ed78-791a-989d-306102e364c7" xlink:to="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-791a-989d-306102e364c7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-7487-aa8a-a282767036c1" 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_019e223a-ed78-791a-989d-306102e364c7" xlink:to="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-7487-aa8a-a282767036c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember_019e223a-ed78-70ac-b580-ae6b2016afb6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedDepreciationAndAmortisationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CarryingAmountMember_019e223a-ed78-7487-aa8a-a282767036c1" xlink:to="loc_ifrs-full_AccumulatedDepreciationAndAmortisationMember_019e223a-ed78-70ac-b580-ae6b2016afb6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019e223a-ed78-7645-a426-f856cc00a732" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-7b60-b540-640b426112c1" xlink:to="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019e223a-ed78-7645-a426-f856cc00a732" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DecreaseThroughClassifiedAsHeldForSaleIntangibleAssetsOtherThanGoodwill_019e7323-4835-7993-9cb2-cfd56ba905a4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DecreaseThroughClassifiedAsHeldForSaleIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-7b60-b540-640b426112c1" xlink:to="loc_ifrs-full_DecreaseThroughClassifiedAsHeldForSaleIntangibleAssetsOtherThanGoodwill_019e7323-4835-7993-9cb2-cfd56ba905a4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_Noncashadditionsintangibleassetsotherthangoodwill_019e223a-ed78-79ca-b721-0cc8915de224" xlink:href="bip-20260630.xsd#bip_Noncashadditionsintangibleassetsotherthangoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-7b60-b540-640b426112c1" xlink:to="loc_bip_Noncashadditionsintangibleassetsotherthangoodwill_019e223a-ed78-79ca-b721-0cc8915de224" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill_019e223a-ed78-7844-957c-432d93f20daa" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-7b60-b540-640b426112c1" xlink:to="loc_ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill_019e223a-ed78-7844-957c-432d93f20daa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisposalsIntangibleAssetsAndGoodwill_019e223a-ed78-791a-bd90-0025b1cf4d0b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisposalsIntangibleAssetsAndGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-7b60-b540-640b426112c1" xlink:to="loc_ifrs-full_DisposalsIntangibleAssetsAndGoodwill_019e223a-ed78-791a-bd90-0025b1cf4d0b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsOtherThanGoodwill_019f5f9e-3ec8-79d0-b33b-522476ed9a7f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-7b60-b540-640b426112c1" xlink:to="loc_ifrs-full_ImpairmentLossRecognisedInProfitOrLossIntangibleAssetsOtherThanGoodwill_019f5f9e-3ec8-79d0-b33b-522476ed9a7f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_IntangibleAssetsReclassifiedAsHeldForSale_019e223a-ed78-7311-b6ec-8e5c826da7de" xlink:href="bip-20260630.xsd#bip_IntangibleAssetsReclassifiedAsHeldForSale"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-7b60-b540-640b426112c1" xlink:to="loc_bip_IntangibleAssetsReclassifiedAsHeldForSale_019e223a-ed78-7311-b6ec-8e5c826da7de" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsOtherThanGoodwill_019e223a-ed78-71c7-b7d0-b9a0004cf14e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfIntangibleAssetsLineItems_019e223a-ed78-7b60-b540-640b426112c1" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsOtherThanGoodwill_019e223a-ed78-71c7-b7d0-b9a0004cf14e" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019e223a-ed78-7052-9380-b2ad4af48c96" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/INVESTMENTINASSOCIATESANDJOINTVENTURESChangeinInvestmentsDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#INVESTMENTINASSOCIATESANDJOINTVENTURESChangeinInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/INVESTMENTINASSOCIATESANDJOINTVENTURESChangeinInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-734b-bfd0-665dc3e416e4" xlink:href="bip-20260630.xsd#bip_DisclosureOfAssociatesAndJointVenturesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfAssociatesAndJointVenturesTable_019e223a-ed78-7dbd-b9f2-d4353d636ce4" xlink:href="bip-20260630.xsd#bip_DisclosureOfAssociatesAndJointVenturesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-734b-bfd0-665dc3e416e4" xlink:to="loc_bip_DisclosureOfAssociatesAndJointVenturesTable_019e223a-ed78-7dbd-b9f2-d4353d636ce4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-7c32-991d-dd4df67acb9b" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesTable_019e223a-ed78-7dbd-b9f2-d4353d636ce4" xlink:to="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-7c32-991d-dd4df67acb9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7c32-991d-dd4df67acb9b_default" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-7c32-991d-dd4df67acb9b" xlink:to="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7c32-991d-dd4df67acb9b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-76c6-9c94-0e702761b799" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-7c32-991d-dd4df67acb9b" xlink:to="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-76c6-9c94-0e702761b799" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BrazilianElectricityTransmissionOperationMember_019e7332-4f86-78f8-8e6b-168e45d5b260" xlink:href="bip-20260630.xsd#bip_BrazilianElectricityTransmissionOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-76c6-9c94-0e702761b799" xlink:to="loc_bip_BrazilianElectricityTransmissionOperationMember_019e7332-4f86-78f8-8e6b-168e45d5b260" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.S.GasPipelineMember_019e7332-7416-734a-befb-84db7b5e4ed9" xlink:href="bip-20260630.xsd#bip_U.S.GasPipelineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-76c6-9c94-0e702761b799" xlink:to="loc_bip_U.S.GasPipelineMember_019e7332-7416-734a-befb-84db7b5e4ed9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AustralianRegulatedUtilityOperationMember_019e7332-95d1-773c-ac99-bf76922ff50e" xlink:href="bip-20260630.xsd#bip_AustralianRegulatedUtilityOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-76c6-9c94-0e702761b799" xlink:to="loc_bip_AustralianRegulatedUtilityOperationMember_019e7332-95d1-773c-ac99-bf76922ff50e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.K.PortOperationMember_019e7332-fbce-73a7-a882-285972705f78" xlink:href="bip-20260630.xsd#bip_U.K.PortOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-76c6-9c94-0e702761b799" xlink:to="loc_bip_U.K.PortOperationMember_019e7332-fbce-73a7-a882-285972705f78" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SouthKoreanIndustrialGasBusinessMember_019e7333-18f0-7f35-b49a-fa81c2f98560" xlink:href="bip-20260630.xsd#bip_SouthKoreanIndustrialGasBusinessMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-76c6-9c94-0e702761b799" xlink:to="loc_bip_SouthKoreanIndustrialGasBusinessMember_019e7333-18f0-7f35-b49a-fa81c2f98560" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.S.SemiconductorManufacturingFacilityMember_019fa33a-424f-74d3-9038-ce7511f31deb" xlink:href="bip-20260630.xsd#bip_U.S.SemiconductorManufacturingFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-76c6-9c94-0e702761b799" xlink:to="loc_bip_U.S.SemiconductorManufacturingFacilityMember_019fa33a-424f-74d3-9038-ce7511f31deb" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_019e223a-ed78-7183-bdba-4a424de38013" 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_bip_DisclosureOfAssociatesAndJointVenturesTable_019e223a-ed78-7dbd-b9f2-d4353d636ce4" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesAxis_019e223a-ed78-7183-bdba-4a424de38013" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e223a-ed78-7183-bdba-4a424de38013_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_019e223a-ed78-7183-bdba-4a424de38013" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e223a-ed78-7183-bdba-4a424de38013_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e223a-ed78-7165-ae4d-f24b27ab65e6" 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_019e223a-ed78-7183-bdba-4a424de38013" xlink:to="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e223a-ed78-7165-ae4d-f24b27ab65e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_GlobalIntermodalLogisticsOperationMember_019e7331-ee1f-7177-83b0-d369a1293087" xlink:href="bip-20260630.xsd#bip_GlobalIntermodalLogisticsOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e223a-ed78-7165-ae4d-f24b27ab65e6" xlink:to="loc_bip_GlobalIntermodalLogisticsOperationMember_019e7331-ee1f-7177-83b0-d369a1293087" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_EuropeanHyperscaleDataCenterPlatformMember_019e7332-db2d-7033-81c1-e3da6269627d" xlink:href="bip-20260630.xsd#bip_EuropeanHyperscaleDataCenterPlatformMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e223a-ed78-7165-ae4d-f24b27ab65e6" xlink:to="loc_bip_EuropeanHyperscaleDataCenterPlatformMember_019e7332-db2d-7033-81c1-e3da6269627d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.K.PortOperationMember_019e7332-fbce-7473-bf2a-7c3613f81ea8" xlink:href="bip-20260630.xsd#bip_U.K.PortOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e223a-ed78-7165-ae4d-f24b27ab65e6" xlink:to="loc_bip_U.K.PortOperationMember_019e7332-fbce-7473-bf2a-7c3613f81ea8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BrookfieldInfrastructureMember_019e7333-18f0-776a-90e2-f8b739852cf3" xlink:href="bip-20260630.xsd#bip_BrookfieldInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e223a-ed78-7165-ae4d-f24b27ab65e6" xlink:to="loc_bip_BrookfieldInfrastructureMember_019e7333-18f0-776a-90e2-f8b739852cf3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_GATXCorporationMember_019e7333-320e-7f31-985f-8c1d4bf44f31" xlink:href="bip-20260630.xsd#bip_GATXCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e223a-ed78-7165-ae4d-f24b27ab65e6" xlink:to="loc_bip_GATXCorporationMember_019e7333-320e-7f31-985f-8c1d4bf44f31" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.S.BulkFiberNetworkMember_019f8975-4dbe-7250-b4c8-b8f55523db9e" xlink:href="bip-20260630.xsd#bip_U.S.BulkFiberNetworkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SignificantInvestmentsInSubsidiariesDomain_019e223a-ed78-7165-ae4d-f24b27ab65e6" xlink:to="loc_bip_U.S.BulkFiberNetworkMember_019f8975-4dbe-7250-b4c8-b8f55523db9e" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsAxis_019e7331-ee1f-74b6-9eb3-03501ae3dba3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesTable_019e223a-ed78-7dbd-b9f2-d4353d636ce4" xlink:to="loc_ifrs-full_BusinessCombinationsAxis_019e7331-ee1f-74b6-9eb3-03501ae3dba3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_019e7331-ee1f-74b6-9eb3-03501ae3dba3_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_019e7331-ee1f-74b6-9eb3-03501ae3dba3" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_019e7331-ee1f-74b6-9eb3-03501ae3dba3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BusinessCombinationsDomain_019e7331-ee1f-7ce1-83fd-66753872109a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BusinessCombinationsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BusinessCombinationsAxis_019e7331-ee1f-74b6-9eb3-03501ae3dba3" xlink:to="loc_ifrs-full_BusinessCombinationsDomain_019e7331-ee1f-7ce1-83fd-66753872109a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BrookfieldInfrastructureMember_019e7331-ee1f-7aa8-9c79-42d8e9726d44" xlink:href="bip-20260630.xsd#bip_BrookfieldInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BusinessCombinationsDomain_019e7331-ee1f-7ce1-83fd-66753872109a" xlink:to="loc_bip_BrookfieldInfrastructureMember_019e7331-ee1f-7aa8-9c79-42d8e9726d44" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisposalOfOwnershipInterestPercentage_019e7331-ee1f-77d5-a063-75386f9edbed" xlink:href="bip-20260630.xsd#bip_DisposalOfOwnershipInterestPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-734b-bfd0-665dc3e416e4" xlink:to="loc_bip_DisposalOfOwnershipInterestPercentage_019e7331-ee1f-77d5-a063-75386f9edbed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromSalesOfInvestmentsAccountedForUsingEquityMethod_019e7331-ee1f-7fee-b949-c89cd9449c29" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromSalesOfInvestmentsAccountedForUsingEquityMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-734b-bfd0-665dc3e416e4" xlink:to="loc_ifrs-full_ProceedsFromSalesOfInvestmentsAccountedForUsingEquityMethod_019e7331-ee1f-7fee-b949-c89cd9449c29" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInAssociate_019e7331-ee1f-74b4-9c36-13d1fcfd3606" 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_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-734b-bfd0-665dc3e416e4" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInAssociate_019e7331-ee1f-74b4-9c36-13d1fcfd3606" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_GainLossOnSaleOfInvestmentsAccountedForUsingEquityMethod_019e7331-ee1f-70f9-8b1f-64833a77147d" xlink:href="bip-20260630.xsd#bip_GainLossOnSaleOfInvestmentsAccountedForUsingEquityMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-734b-bfd0-665dc3e416e4" xlink:to="loc_bip_GainLossOnSaleOfInvestmentsAccountedForUsingEquityMethod_019e7331-ee1f-70f9-8b1f-64833a77147d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ProportionOfOwnershipInterestInSubsidiaryAdditional_019e7332-4f86-730d-b22c-9026acb5c55f" xlink:href="bip-20260630.xsd#bip_ProportionOfOwnershipInterestInSubsidiaryAdditional"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-734b-bfd0-665dc3e416e4" xlink:to="loc_bip_ProportionOfOwnershipInterestInSubsidiaryAdditional_019e7332-4f86-730d-b22c-9026acb5c55f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_019e7332-4f86-7770-9a6d-a755204c036d" 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_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-734b-bfd0-665dc3e416e4" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInSubsidiary_019e7332-4f86-7770-9a6d-a755204c036d" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_RevaluationGainsNetOfTaxReclassifiedFromAccumulatedOtherComprehensiveIncome_019e7332-7416-7152-8e27-47613427986f" xlink:href="bip-20260630.xsd#bip_RevaluationGainsNetOfTaxReclassifiedFromAccumulatedOtherComprehensiveIncome"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-734b-bfd0-665dc3e416e4" xlink:to="loc_bip_RevaluationGainsNetOfTaxReclassifiedFromAccumulatedOtherComprehensiveIncome_019e7332-7416-7152-8e27-47613427986f" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax_019e7332-95d1-7cb6-89a6-099acb3ce4cd" 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_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-734b-bfd0-665dc3e416e4" xlink:to="loc_ifrs-full_ReclassificationAdjustmentsOnExchangeDifferencesOnTranslationNetOfTax_019e7332-95d1-7cb6-89a6-099acb3ce4cd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_019e7333-18f0-708a-b36f-9e05ffe38621" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-734b-bfd0-665dc3e416e4" xlink:to="loc_ifrs-full_AcquisitiondateFairValueOfTotalConsiderationTransferred_019e7333-18f0-708a-b36f-9e05ffe38621" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_EquityCommitmentFundingForJointVenturesAndAssociates_019fa33a-424f-7f20-93cf-72e082611ef3" xlink:href="bip-20260630.xsd#bip_EquityCommitmentFundingForJointVenturesAndAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-734b-bfd0-665dc3e416e4" xlink:to="loc_bip_EquityCommitmentFundingForJointVenturesAndAssociates_019fa33a-424f-7f20-93cf-72e082611ef3" xlink:type="arc" order="9"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/INVESTMENTINASSOCIATESANDJOINTVENTURESSegmentInformationDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#INVESTMENTINASSOCIATESANDJOINTVENTURESSegmentInformationDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/INVESTMENTINASSOCIATESANDJOINTVENTURESSegmentInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-7755-9fa6-96825ccf7016" 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_019e223a-ed78-7996-93b7-0336a6e0b884" 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_019e223a-ed78-7755-9fa6-96825ccf7016" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_019e223a-ed78-7996-93b7-0336a6e0b884" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-78e5-8fda-8a05f7887a93" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_019e223a-ed78-7996-93b7-0336a6e0b884" xlink:to="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-78e5-8fda-8a05f7887a93" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-78e5-8fda-8a05f7887a93_default" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-78e5-8fda-8a05f7887a93" xlink:to="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-78e5-8fda-8a05f7887a93_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7a90-ad4e-b5613239edd3" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-78e5-8fda-8a05f7887a93" xlink:to="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7a90-ad4e-b5613239edd3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_UtilitiesMember_019e223a-ed78-7726-907c-f6ad27c6561a" xlink:href="bip-20260630.xsd#bip_UtilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7a90-ad4e-b5613239edd3" xlink:to="loc_bip_UtilitiesMember_019e223a-ed78-7726-907c-f6ad27c6561a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_TransportMember_019e223a-ed78-7f83-9616-eb27755c3b0f" xlink:href="bip-20260630.xsd#bip_TransportMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7a90-ad4e-b5613239edd3" xlink:to="loc_bip_TransportMember_019e223a-ed78-7f83-9616-eb27755c3b0f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MidstreamMember_019e223a-ed78-7934-a6aa-c1235b351b7f" xlink:href="bip-20260630.xsd#bip_MidstreamMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7a90-ad4e-b5613239edd3" xlink:to="loc_bip_MidstreamMember_019e223a-ed78-7934-a6aa-c1235b351b7f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DataInfrastructureMember_019e223a-ed78-7a87-acf6-eee57973dcd9" xlink:href="bip-20260630.xsd#bip_DataInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7a90-ad4e-b5613239edd3" xlink:to="loc_bip_DataInfrastructureMember_019e223a-ed78-7a87-acf6-eee57973dcd9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_Corporate1Member_019e223a-ed78-7bd7-8331-ab7d654cfa8d" xlink:href="bip-20260630.xsd#bip_Corporate1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7a90-ad4e-b5613239edd3" xlink:to="loc_bip_Corporate1Member_019e223a-ed78-7bd7-8331-ab7d654cfa8d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_InvestmentAccountedForUsingEquityMethod_019e223a-ed78-77aa-8323-d74ae2f3fae6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_InvestmentAccountedForUsingEquityMethod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ed78-7755-9fa6-96825ccf7016" xlink:to="loc_ifrs-full_InvestmentAccountedForUsingEquityMethod_019e223a-ed78-77aa-8323-d74ae2f3fae6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/INVESTMENTINASSOCIATESANDJOINTVENTURESBalanceSheetImpactofInvestmentsDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#INVESTMENTINASSOCIATESANDJOINTVENTURESBalanceSheetImpactofInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/INVESTMENTINASSOCIATESANDJOINTVENTURESBalanceSheetImpactofInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-78bf-ab2f-2b5b951cd2d1" xlink:href="bip-20260630.xsd#bip_DisclosureOfAssociatesAndJointVenturesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfAssociatesAndJointVenturesTable_019e223a-ed78-7f52-b8d4-e29caec5d73d" xlink:href="bip-20260630.xsd#bip_DisclosureOfAssociatesAndJointVenturesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-78bf-ab2f-2b5b951cd2d1" xlink:to="loc_bip_DisclosureOfAssociatesAndJointVenturesTable_019e223a-ed78-7f52-b8d4-e29caec5d73d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-7395-8565-89f9c38b4cad" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesTable_019e223a-ed78-7f52-b8d4-e29caec5d73d" xlink:to="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-7395-8565-89f9c38b4cad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7395-8565-89f9c38b4cad_default" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-7395-8565-89f9c38b4cad" xlink:to="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7395-8565-89f9c38b4cad_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7148-ae0e-0ca598d25105" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-7395-8565-89f9c38b4cad" xlink:to="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7148-ae0e-0ca598d25105" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesMember_019e223a-ed78-7d64-b610-ee758ee7ddc9" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7148-ae0e-0ca598d25105" xlink:to="loc_bip_AssociatesAndJointVenturesMember_019e223a-ed78-7d64-b610-ee758ee7ddc9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Assets_019e223a-ed78-75ed-8dfc-f62d4c20a5bc" 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_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-78bf-ab2f-2b5b951cd2d1" xlink:to="loc_ifrs-full_Assets_019e223a-ed78-75ed-8dfc-f62d4c20a5bc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Liabilities_019e223a-ed78-72b3-b86e-aacb5400e5c7" 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_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-78bf-ab2f-2b5b951cd2d1" xlink:to="loc_ifrs-full_Liabilities_019e223a-ed78-72b3-b86e-aacb5400e5c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NetAssetsLiabilities_019e223a-ed78-73fa-9c42-958cc58afb93" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NetAssetsLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-78bf-ab2f-2b5b951cd2d1" xlink:to="loc_ifrs-full_NetAssetsLiabilities_019e223a-ed78-73fa-9c42-958cc58afb93" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/INVESTMENTINASSOCIATESANDJOINTVENTURESIncomeStatementImpactofInvestmentsDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#INVESTMENTINASSOCIATESANDJOINTVENTURESIncomeStatementImpactofInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/INVESTMENTINASSOCIATESANDJOINTVENTURESIncomeStatementImpactofInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-7fee-b155-6a2934a06a1a" xlink:href="bip-20260630.xsd#bip_DisclosureOfAssociatesAndJointVenturesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DisclosureOfAssociatesAndJointVenturesTable_019e223a-ed78-79a6-a3ca-059a1bd2ec0a" xlink:href="bip-20260630.xsd#bip_DisclosureOfAssociatesAndJointVenturesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-7fee-b155-6a2934a06a1a" xlink:to="loc_bip_DisclosureOfAssociatesAndJointVenturesTable_019e223a-ed78-79a6-a3ca-059a1bd2ec0a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-731f-a4f5-e0bf55d75068" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesTable_019e223a-ed78-79a6-a3ca-059a1bd2ec0a" xlink:to="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-731f-a4f5-e0bf55d75068" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-731f-a4f5-e0bf55d75068_default" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-731f-a4f5-e0bf55d75068" xlink:to="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-731f-a4f5-e0bf55d75068_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7a69-9f8a-985526d432a3" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_bip_AssociatesAndJointVenturesAxis_019e223a-ed78-731f-a4f5-e0bf55d75068" xlink:to="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7a69-9f8a-985526d432a3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesMember_019e223a-ed78-761f-bdac-dbbd2f7a6a92" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e223a-ed78-7a69-9f8a-985526d432a3" xlink:to="loc_bip_AssociatesAndJointVenturesMember_019e223a-ed78-761f-bdac-dbbd2f7a6a92" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue_019e223a-ed78-772f-8906-9e3ba5301aea" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Revenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-7fee-b155-6a2934a06a1a" xlink:to="loc_ifrs-full_Revenue_019e223a-ed78-772f-8906-9e3ba5301aea" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProfitLoss_019e223a-ed78-7334-b77c-aeb52bd346c2" 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_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-7fee-b155-6a2934a06a1a" xlink:to="loc_ifrs-full_ProfitLoss_019e223a-ed78-7334-b77c-aeb52bd346c2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_019e223a-ed78-7be7-90c4-e81c9302e9e1" 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_bip_DisclosureOfAssociatesAndJointVenturesLineItems_019e223a-ed78-7fee-b155-6a2934a06a1a" xlink:to="loc_ifrs-full_ShareOfProfitLossOfAssociatesAndJointVenturesAccountedForUsingEquityMethod_019e223a-ed78-7be7-90c4-e81c9302e9e1" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/BORROWINGSAdditionalInformationDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#BORROWINGSAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/BORROWINGSAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-74bb-aca8-711ad0c5fcb4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_019e223a-ed78-70ad-b1a7-b8ca65852700" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-74bb-aca8-711ad0c5fcb4" xlink:to="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_019e223a-ed78-70ad-b1a7-b8ca65852700" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameAxis_019e733b-d418-70bc-8925-221b82f23247" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_019e223a-ed78-70ad-b1a7-b8ca65852700" xlink:to="loc_ifrs-full_BorrowingsByNameAxis_019e733b-d418-70bc-8925-221b82f23247" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_019e733b-d418-70bc-8925-221b82f23247_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_019e733b-d418-70bc-8925-221b82f23247" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_019e733b-d418-70bc-8925-221b82f23247_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_019e733b-d418-7b2e-98d4-9184f7ed77ca" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_019e733b-d418-70bc-8925-221b82f23247" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_019e733b-d418-7b2e-98d4-9184f7ed77ca" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SeniorUnsecuredRevolvingCreditFacilityMember_019e733b-d418-7bb5-958f-ca9dc8cc5f84" xlink:href="bip-20260630.xsd#bip_SeniorUnsecuredRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e733b-d418-7b2e-98d4-9184f7ed77ca" xlink:to="loc_bip_SeniorUnsecuredRevolvingCreditFacilityMember_019e733b-d418-7bb5-958f-ca9dc8cc5f84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingJanuary62031Member_019e733b-fe6f-7fad-ab3b-4446db21169f" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingJanuary62031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e733b-d418-7b2e-98d4-9184f7ed77ca" xlink:to="loc_bip_MediumTermNotesMaturingJanuary62031Member_019e733b-fe6f-7fad-ab3b-4446db21169f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingSeptember242035Member_019e733b-fe6f-756b-8c27-ec3d8a40fa57" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingSeptember242035Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e733b-d418-7b2e-98d4-9184f7ed77ca" xlink:to="loc_bip_MediumTermNotesMaturingSeptember242035Member_019e733b-fe6f-756b-8c27-ec3d8a40fa57" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SubordinatedNotesMaturingSeptember12055Member_019e733c-1e9d-7c5f-bf37-c92422fc46c6" xlink:href="bip-20260630.xsd#bip_SubordinatedNotesMaturingSeptember12055Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e733b-d418-7b2e-98d4-9184f7ed77ca" xlink:to="loc_bip_SubordinatedNotesMaturingSeptember12055Member_019e733c-1e9d-7c5f-bf37-c92422fc46c6" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_RevolvingCreditFacilityWithBrookfieldMember_019e733c-3ef9-7502-8c99-4ac4b5358a3a" xlink:href="bip-20260630.xsd#bip_RevolvingCreditFacilityWithBrookfieldMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e733b-d418-7b2e-98d4-9184f7ed77ca" xlink:to="loc_bip_RevolvingCreditFacilityWithBrookfieldMember_019e733c-3ef9-7502-8c99-4ac4b5358a3a" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesAxis_019e733b-d418-781c-92e0-f15c44b06365" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_019e223a-ed78-70ad-b1a7-b8ca65852700" xlink:to="loc_ifrs-full_TypesOfInterestRatesAxis_019e733b-d418-781c-92e0-f15c44b06365" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesDomain_019e733b-d418-781c-92e0-f15c44b06365_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis_019e733b-d418-781c-92e0-f15c44b06365" xlink:to="loc_ifrs-full_TypesOfInterestRatesDomain_019e733b-d418-781c-92e0-f15c44b06365_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesDomain_019e733b-d418-7acd-a9d7-db8017583918" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis_019e733b-d418-781c-92e0-f15c44b06365" xlink:to="loc_ifrs-full_TypesOfInterestRatesDomain_019e733b-d418-7acd-a9d7-db8017583918" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FloatingInterestRateMember_019e733b-d418-7fa2-a86c-188729a78a53" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FloatingInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfInterestRatesDomain_019e733b-d418-7acd-a9d7-db8017583918" xlink:to="loc_ifrs-full_FloatingInterestRateMember_019e733b-d418-7fa2-a86c-188729a78a53" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FixedInterestRateMember_019e733b-fe6f-7294-85d7-7bc445698c6f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FixedInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfInterestRatesDomain_019e733b-d418-7acd-a9d7-db8017583918" xlink:to="loc_ifrs-full_FixedInterestRateMember_019e733b-fe6f-7294-85d7-7bc445698c6f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_LineofCreditFacilityMaximumBorrowingCapacity1_019e733b-d418-7d72-8cb1-8b0826ddea38" xlink:href="bip-20260630.xsd#bip_LineofCreditFacilityMaximumBorrowingCapacity1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-74bb-aca8-711ad0c5fcb4" xlink:to="loc_bip_LineofCreditFacilityMaximumBorrowingCapacity1_019e733b-d418-7d72-8cb1-8b0826ddea38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsInterestRate_019e733b-d418-7779-ae83-60b7d1af8bb3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-74bb-aca8-711ad0c5fcb4" xlink:to="loc_ifrs-full_BorrowingsInterestRate_019e733b-d418-7779-ae83-60b7d1af8bb3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_LineofCreditFacilityUnusedCapacityCommitmentFeePercentage_019e733b-d418-7d44-8093-c6bfe7b65114" xlink:href="bip-20260630.xsd#bip_LineofCreditFacilityUnusedCapacityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-74bb-aca8-711ad0c5fcb4" xlink:to="loc_bip_LineofCreditFacilityUnusedCapacityCommitmentFeePercentage_019e733b-d418-7d44-8093-c6bfe7b65114" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Borrowings_019e733b-d418-7d6a-bc56-6b67ce7c65b3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Borrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-74bb-aca8-711ad0c5fcb4" xlink:to="loc_ifrs-full_Borrowings_019e733b-d418-7d6a-bc56-6b67ce7c65b3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_LetterOfCreditOutstandingAmount_019e733b-d418-794f-b127-142b1871ce11" xlink:href="bip-20260630.xsd#bip_LetterOfCreditOutstandingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-74bb-aca8-711ad0c5fcb4" xlink:to="loc_bip_LetterOfCreditOutstandingAmount_019e733b-d418-794f-b127-142b1871ce11" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BorrowingsVariableRate_019e733c-1e9d-7050-befb-20ab657a1be4" xlink:href="bip-20260630.xsd#bip_BorrowingsVariableRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-74bb-aca8-711ad0c5fcb4" xlink:to="loc_bip_BorrowingsVariableRate_019e733c-1e9d-7050-befb-20ab657a1be4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BorrowingRenewalTerm_019e733c-3ef9-7b13-8904-9e88e5d49063" xlink:href="bip-20260630.xsd#bip_BorrowingRenewalTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-74bb-aca8-711ad0c5fcb4" xlink:to="loc_bip_BorrowingRenewalTerm_019e733c-3ef9-7b13-8904-9e88e5d49063" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsAdjustmentToInterestRateBasis_019e733c-3ef9-7b24-9105-86422165b7a3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsAdjustmentToInterestRateBasis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-74bb-aca8-711ad0c5fcb4" xlink:to="loc_ifrs-full_BorrowingsAdjustmentToInterestRateBasis_019e733c-3ef9-7b24-9105-86422165b7a3" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CommercialPapersIssued_019e733c-5728-7ab7-96eb-a88cc455e73a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CommercialPapersIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-74bb-aca8-711ad0c5fcb4" xlink:to="loc_ifrs-full_CommercialPapersIssued_019e733c-5728-7ab7-96eb-a88cc455e73a" xlink:type="arc" order="8"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/BORROWINGSCorporateBorrowingsDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#BORROWINGSCorporateBorrowingsDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/BORROWINGSCorporateBorrowingsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-7a7a-8702-d7650b596f97" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_019e223a-ee54-79ff-b47b-e61b076113ea" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-7a7a-8702-d7650b596f97" xlink:to="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_019e223a-ee54-79ff-b47b-e61b076113ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameAxis_019e223a-ee54-7000-8ab4-2a40acfb0b7a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_019e223a-ee54-79ff-b47b-e61b076113ea" xlink:to="loc_ifrs-full_BorrowingsByNameAxis_019e223a-ee54-7000-8ab4-2a40acfb0b7a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7000-8ab4-2a40acfb0b7a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_019e223a-ee54-7000-8ab4-2a40acfb0b7a" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7000-8ab4-2a40acfb0b7a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_019e223a-ee54-7000-8ab4-2a40acfb0b7a" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SeniorUnsecuredRevolvingCreditFacilityMember_019e223a-ee54-7260-8736-3caecc9453a8" xlink:href="bip-20260630.xsd#bip_SeniorUnsecuredRevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_SeniorUnsecuredRevolvingCreditFacilityMember_019e223a-ee54-7260-8736-3caecc9453a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_USCommercialPaperProgramMember_019e223a-ee54-7baf-9868-d3abb7f6c61c" xlink:href="bip-20260630.xsd#bip_USCommercialPaperProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_USCommercialPaperProgramMember_019e223a-ee54-7baf-9868-d3abb7f6c61c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingNovember142027Member_019e223a-ee54-7615-b832-6258787020e4" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingNovember142027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_MediumTermNotesMaturingNovember142027Member_019e223a-ee54-7615-b832-6258787020e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingSeptember112028Member_019e223a-ee54-73b0-b89f-c9b115b87d2c" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingSeptember112028Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_MediumTermNotesMaturingSeptember112028Member_019e223a-ee54-73b0-b89f-c9b115b87d2c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingOctober92029Member_019e223a-ee54-7069-8db4-33ea58968686" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingOctober92029Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_MediumTermNotesMaturingOctober92029Member_019e223a-ee54-7069-8db4-33ea58968686" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingJuly272030Member_019e223a-ee54-706c-a1c1-203e74b55386" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingJuly272030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_MediumTermNotesMaturingJuly272030Member_019e223a-ee54-706c-a1c1-203e74b55386" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingJanuary62031Member_019e7338-e165-7324-9de6-2caa45c1f603" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingJanuary62031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_MediumTermNotesMaturingJanuary62031Member_019e7338-e165-7324-9de6-2caa45c1f603" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingSeptember12032Member_019e223a-ee54-7a04-bbc2-6d9fd55720b9" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingSeptember12032Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_MediumTermNotesMaturingSeptember12032Member_019e223a-ee54-7a04-bbc2-6d9fd55720b9" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingFebruary142033Member_019e223a-ee54-7e1a-a9e2-4d4f7ab6bcbe" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingFebruary142033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_MediumTermNotesMaturingFebruary142033Member_019e223a-ee54-7e1a-a9e2-4d4f7ab6bcbe" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingApril252034Member_019e223a-ee54-7335-8812-554e56a1f606" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingApril252034Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_MediumTermNotesMaturingApril252034Member_019e223a-ee54-7335-8812-554e56a1f606" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingSeptember242035Member_019e7339-5878-7289-8607-ffac4d32c6df" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingSeptember242035Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_MediumTermNotesMaturingSeptember242035Member_019e7339-5878-7289-8607-ffac4d32c6df" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingApril252052Member_019e223a-ee54-7257-9f54-c5a7624b9987" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingApril252052Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_MediumTermNotesMaturingApril252052Member_019e223a-ee54-7257-9f54-c5a7624b9987" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingJuly272053Member_019e223a-ee54-7d7e-b1fc-76633eecd248" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingJuly272053Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_MediumTermNotesMaturingJuly272053Member_019e223a-ee54-7d7e-b1fc-76633eecd248" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SubordinatedNotesMaturingMarch152055Member_019e223a-ee54-7e9d-972d-95c6766e77e1" xlink:href="bip-20260630.xsd#bip_SubordinatedNotesMaturingMarch152055Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_SubordinatedNotesMaturingMarch152055Member_019e223a-ee54-7e9d-972d-95c6766e77e1" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SubordinatedNotesMaturingSeptember12055Member_019e223a-ee54-748b-b003-360a301d96e3" xlink:href="bip-20260630.xsd#bip_SubordinatedNotesMaturingSeptember12055Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_SubordinatedNotesMaturingSeptember12055Member_019e223a-ee54-748b-b003-360a301d96e3" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SubordinatedNotesMaturingMay242081Member_019e223a-ee54-7604-bfc6-9a2806d58d03" xlink:href="bip-20260630.xsd#bip_SubordinatedNotesMaturingMay242081Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_SubordinatedNotesMaturingMay242081Member_019e223a-ee54-7604-bfc6-9a2806d58d03" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SubordinatedNotesMaturingMay312084Member_019e223a-ee54-7bab-8829-8354cb0305f5" xlink:href="bip-20260630.xsd#bip_SubordinatedNotesMaturingMay312084Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_SubordinatedNotesMaturingMay312084Member_019e223a-ee54-7bab-8829-8354cb0305f5" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_CorporateBorrowingsMember_019e223a-ee54-73d4-ba98-445a6db2046d" xlink:href="bip-20260630.xsd#bip_CorporateBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-7d3f-b848-f66570cf0dbf" xlink:to="loc_bip_CorporateBorrowingsMember_019e223a-ee54-73d4-ba98-445a6db2046d" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesAxis_019e223a-ee54-7456-9903-715fa152ba54" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_019e223a-ee54-79ff-b47b-e61b076113ea" xlink:to="loc_ifrs-full_TypesOfInterestRatesAxis_019e223a-ee54-7456-9903-715fa152ba54" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesDomain_019e223a-ee54-7456-9903-715fa152ba54_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis_019e223a-ee54-7456-9903-715fa152ba54" xlink:to="loc_ifrs-full_TypesOfInterestRatesDomain_019e223a-ee54-7456-9903-715fa152ba54_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesDomain_019e223a-ee54-7c03-9e1d-b12c3f43c7ec" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis_019e223a-ee54-7456-9903-715fa152ba54" xlink:to="loc_ifrs-full_TypesOfInterestRatesDomain_019e223a-ee54-7c03-9e1d-b12c3f43c7ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FloatingInterestRateMember_019e223a-ee54-77cc-b390-b80a55d1db84" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FloatingInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfInterestRatesDomain_019e223a-ee54-7c03-9e1d-b12c3f43c7ec" xlink:to="loc_ifrs-full_FloatingInterestRateMember_019e223a-ee54-77cc-b390-b80a55d1db84" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FixedInterestRateMember_019e223a-ee54-75d5-96e2-f0c5c3dfae26" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FixedInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfInterestRatesDomain_019e223a-ee54-7c03-9e1d-b12c3f43c7ec" xlink:to="loc_ifrs-full_FixedInterestRateMember_019e223a-ee54-75d5-96e2-f0c5c3dfae26" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsInterestRate_019e223a-ee54-70d2-9bee-c8d48cebacef" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-7a7a-8702-d7650b596f97" xlink:to="loc_ifrs-full_BorrowingsInterestRate_019e223a-ee54-70d2-9bee-c8d48cebacef" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Borrowings_019e223a-ee54-7f72-a0df-9f32c612e058" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Borrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-7a7a-8702-d7650b596f97" xlink:to="loc_ifrs-full_Borrowings_019e223a-ee54-7f72-a0df-9f32c612e058" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_CorporateBorrowingsOutstandingPrincipal_019e223a-ee54-7fea-9886-eedb44dbca5f" xlink:href="bip-20260630.xsd#bip_CorporateBorrowingsOutstandingPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-7a7a-8702-d7650b596f97" xlink:to="loc_bip_CorporateBorrowingsOutstandingPrincipal_019e223a-ee54-7fea-9886-eedb44dbca5f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_CorporateBorrowingsDeferredFinancingCostsandOther_019e223a-ee54-7bd1-a95f-92279482ce09" xlink:href="bip-20260630.xsd#bip_CorporateBorrowingsDeferredFinancingCostsandOther"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-7a7a-8702-d7650b596f97" xlink:to="loc_bip_CorporateBorrowingsDeferredFinancingCostsandOther_019e223a-ee54-7bd1-a95f-92279482ce09" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/BORROWINGSNonRecourseBorrowingsDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#BORROWINGSNonRecourseBorrowingsDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/BORROWINGSNonRecourseBorrowingsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-7d22-b20d-e2445963be77" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_019e223a-ee54-74ca-abe8-b220a0b39b5f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-7d22-b20d-e2445963be77" xlink:to="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_019e223a-ee54-74ca-abe8-b220a0b39b5f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameAxis_019e223a-ee54-73c7-b5bd-3dad2376688e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsTable_019e223a-ee54-74ca-abe8-b220a0b39b5f" xlink:to="loc_ifrs-full_BorrowingsByNameAxis_019e223a-ee54-73c7-b5bd-3dad2376688e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-73c7-b5bd-3dad2376688e_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_019e223a-ee54-73c7-b5bd-3dad2376688e" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-73c7-b5bd-3dad2376688e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-77b8-a0a8-bf9a8347f88a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_019e223a-ee54-73c7-b5bd-3dad2376688e" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-77b8-a0a8-bf9a8347f88a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonRecourseBorrowingsMember_019e223a-ee54-74ca-9f14-240d747b62d9" xlink:href="bip-20260630.xsd#bip_NonRecourseBorrowingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e223a-ee54-77b8-a0a8-bf9a8347f88a" xlink:to="loc_bip_NonRecourseBorrowingsMember_019e223a-ee54-74ca-9f14-240d747b62d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_CurrentNonrecourseBorrowingsAndCurrentPortionOfNoncurrentNonrecourseBorrowings_019e223a-ee54-73de-a5e1-0374144638a8" xlink:href="bip-20260630.xsd#bip_CurrentNonrecourseBorrowingsAndCurrentPortionOfNoncurrentNonrecourseBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-7d22-b20d-e2445963be77" xlink:to="loc_bip_CurrentNonrecourseBorrowingsAndCurrentPortionOfNoncurrentNonrecourseBorrowings_019e223a-ee54-73de-a5e1-0374144638a8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NoncurrentPortionOfNoncurrentNonrecourseBorrowings_019e223a-ee54-7708-8bcb-593d0eeea6ba" xlink:href="bip-20260630.xsd#bip_NoncurrentPortionOfNoncurrentNonrecourseBorrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-7d22-b20d-e2445963be77" xlink:to="loc_bip_NoncurrentPortionOfNoncurrentNonrecourseBorrowings_019e223a-ee54-7708-8bcb-593d0eeea6ba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Borrowings_019e223a-ee54-7ae3-8980-bd40bc5b2d41" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Borrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfDetailedInformationAboutBorrowingsLineItems_019e223a-ee54-7d22-b20d-e2445963be77" xlink:to="loc_ifrs-full_Borrowings_019e223a-ee54-7ae3-8980-bd40bc5b2d41" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/CAPITALMANAGEMENTNarrativeDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#CAPITALMANAGEMENTNarrativeDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/CAPITALMANAGEMENTNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalLineItems_019e223a-ee54-7993-8aed-fcad6e9f8701" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalTable_019e223a-ee54-792e-ad67-e5afa8d87a91" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalLineItems_019e223a-ee54-7993-8aed-fcad6e9f8701" xlink:to="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalTable_019e223a-ee54-792e-ad67-e5afa8d87a91" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeAxis_019e223a-ee54-77f6-8671-b0d56cf68554" 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_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalTable_019e223a-ee54-792e-ad67-e5afa8d87a91" xlink:to="loc_ifrs-full_RangeAxis_019e223a-ee54-77f6-8671-b0d56cf68554" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_019e223a-ee54-77f6-8671-b0d56cf68554_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_019e223a-ee54-77f6-8671-b0d56cf68554" xlink:to="loc_ifrs-full_RangeDomain_019e223a-ee54-77f6-8671-b0d56cf68554_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RangeDomain_019e223a-ee54-78ca-890c-f324679ff8f9" 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_019e223a-ee54-77f6-8671-b0d56cf68554" xlink:to="loc_ifrs-full_RangeDomain_019e223a-ee54-78ca-890c-f324679ff8f9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BottomOfRangeMember_019e223a-ee54-79ef-911b-92a1a3a77d96" 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_019e223a-ee54-78ca-890c-f324679ff8f9" xlink:to="loc_ifrs-full_BottomOfRangeMember_019e223a-ee54-79ef-911b-92a1a3a77d96" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TopOfRangeMember_019e223a-ee54-7134-b80d-270886a8a4af" 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_019e223a-ee54-78ca-890c-f324679ff8f9" xlink:to="loc_ifrs-full_TopOfRangeMember_019e223a-ee54-7134-b80d-270886a8a4af" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_Targetedreturnsoninvestedcapital_019e223a-ee54-7075-afcc-a49853f49cf1" xlink:href="bip-20260630.xsd#bip_Targetedreturnsoninvestedcapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfObjectivesPoliciesAndProcessesForManagingCapitalLineItems_019e223a-ee54-7993-8aed-fcad6e9f8701" xlink:to="loc_bip_Targetedreturnsoninvestedcapital_019e223a-ee54-7075-afcc-a49853f49cf1" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/SUBSIDIARYPUBLICISSUERSAdditionalInformationDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#SUBSIDIARYPUBLICISSUERSAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/SUBSIDIARYPUBLICISSUERSAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems_019e7343-e87c-73d0-b14c-dcd45a8eb4ff" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesTable_019e7343-e87c-7f78-b3ba-a613e886db8a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems_019e7343-e87c-73d0-b14c-dcd45a8eb4ff" xlink:to="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesTable_019e7343-e87c-7f78-b3ba-a613e886db8a" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameAxis_019e7343-e87c-7c47-a2b9-e9a8dbcf1cac" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesTable_019e7343-e87c-7f78-b3ba-a613e886db8a" xlink:to="loc_ifrs-full_BorrowingsByNameAxis_019e7343-e87c-7c47-a2b9-e9a8dbcf1cac" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_019e7343-e87c-7c47-a2b9-e9a8dbcf1cac_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_019e7343-e87c-7c47-a2b9-e9a8dbcf1cac" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_019e7343-e87c-7c47-a2b9-e9a8dbcf1cac_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_019e7343-e87c-72e9-9287-01c8c12de39b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_019e7343-e87c-7c47-a2b9-e9a8dbcf1cac" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_019e7343-e87c-72e9-9287-01c8c12de39b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingJanuary62031Member_019e7343-e87c-76a7-83a6-83e581a893f4" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingJanuary62031Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e7343-e87c-72e9-9287-01c8c12de39b" xlink:to="loc_bip_MediumTermNotesMaturingJanuary62031Member_019e7343-e87c-76a7-83a6-83e581a893f4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingJanuary62031TrancheOneMember_019e7343-e87c-7180-994f-1d3b5c95b39c" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingJanuary62031TrancheOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e7343-e87c-72e9-9287-01c8c12de39b" xlink:to="loc_bip_MediumTermNotesMaturingJanuary62031TrancheOneMember_019e7343-e87c-7180-994f-1d3b5c95b39c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MediumTermNotesMaturingJanuary62031TrancheTwoMember_019e7343-e87c-71d3-9261-3d534d22ba19" xlink:href="bip-20260630.xsd#bip_MediumTermNotesMaturingJanuary62031TrancheTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e7343-e87c-72e9-9287-01c8c12de39b" xlink:to="loc_bip_MediumTermNotesMaturingJanuary62031TrancheTwoMember_019e7343-e87c-71d3-9261-3d534d22ba19" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SubordinatedNotesMaturingSeptember12055Member_019e7344-0635-7a12-8ab2-1b0dfdf6fdc0" xlink:href="bip-20260630.xsd#bip_SubordinatedNotesMaturingSeptember12055Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e7343-e87c-72e9-9287-01c8c12de39b" xlink:to="loc_bip_SubordinatedNotesMaturingSeptember12055Member_019e7344-0635-7a12-8ab2-1b0dfdf6fdc0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SubordinatedNotesMaturingSeptember12030Member_019e7344-0635-75e3-a463-aac3360f08a1" xlink:href="bip-20260630.xsd#bip_SubordinatedNotesMaturingSeptember12030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e7343-e87c-72e9-9287-01c8c12de39b" xlink:to="loc_bip_SubordinatedNotesMaturingSeptember12030Member_019e7344-0635-75e3-a463-aac3360f08a1" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesAxis_019e7344-0635-7cfa-87cc-7b7d89cff5b1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesTable_019e7343-e87c-7f78-b3ba-a613e886db8a" xlink:to="loc_ifrs-full_TypesOfInterestRatesAxis_019e7344-0635-7cfa-87cc-7b7d89cff5b1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesDomain_019e7344-0635-7cfa-87cc-7b7d89cff5b1_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis_019e7344-0635-7cfa-87cc-7b7d89cff5b1" xlink:to="loc_ifrs-full_TypesOfInterestRatesDomain_019e7344-0635-7cfa-87cc-7b7d89cff5b1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesDomain_019e7344-0635-7ccd-9456-65443bf53c06" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis_019e7344-0635-7cfa-87cc-7b7d89cff5b1" xlink:to="loc_ifrs-full_TypesOfInterestRatesDomain_019e7344-0635-7ccd-9456-65443bf53c06" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FixedInterestRateMember_019e7344-0635-7918-91b7-65802f9f0c0e" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FixedInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfInterestRatesDomain_019e7344-0635-7ccd-9456-65443bf53c06" xlink:to="loc_ifrs-full_FixedInterestRateMember_019e7344-0635-7918-91b7-65802f9f0c0e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FloatingInterestRateMember_019e7344-0635-7ae9-b8ff-0441eed2bc2a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FloatingInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfInterestRatesDomain_019e7344-0635-7ccd-9456-65443bf53c06" xlink:to="loc_ifrs-full_FloatingInterestRateMember_019e7344-0635-7ae9-b8ff-0441eed2bc2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NotionalAmount_019e7343-e87c-73f7-9c4d-00a0b9fc1dfc" 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_DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems_019e7343-e87c-73d0-b14c-dcd45a8eb4ff" xlink:to="loc_ifrs-full_NotionalAmount_019e7343-e87c-73f7-9c4d-00a0b9fc1dfc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsInterestRate_019e7343-e87c-7038-bda2-31938a756c36" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems_019e7343-e87c-73d0-b14c-dcd45a8eb4ff" xlink:to="loc_ifrs-full_BorrowingsInterestRate_019e7343-e87c-7038-bda2-31938a756c36" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BorrowingsVariableRate_019e7344-0635-7128-8e37-25c545bebbe7" xlink:href="bip-20260630.xsd#bip_BorrowingsVariableRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems_019e7343-e87c-73d0-b14c-dcd45a8eb4ff" xlink:to="loc_bip_BorrowingsVariableRate_019e7344-0635-7128-8e37-25c545bebbe7" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/SUBSIDIARYPUBLICISSUERSFinancialInformationDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#SUBSIDIARYPUBLICISSUERSFinancialInformationDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/SUBSIDIARYPUBLICISSUERSFinancialInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems_019e223a-ee54-70ca-b717-8c1d841f859a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesTable_019e223a-ee54-7a85-8555-1be149b53897" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems_019e223a-ee54-70ca-b717-8c1d841f859a" xlink:to="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesTable_019e223a-ee54-7a85-8555-1be149b53897" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ConsolidatedStructuredEntitiesAxis_019e223a-ee54-7792-bb4e-14c478825196" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ConsolidatedStructuredEntitiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesTable_019e223a-ee54-7a85-8555-1be149b53897" xlink:to="loc_ifrs-full_ConsolidatedStructuredEntitiesAxis_019e223a-ee54-7792-bb4e-14c478825196" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ConsolidatedStructuredEntitiesDomain_019e223a-ee54-7792-bb4e-14c478825196_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ConsolidatedStructuredEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_ConsolidatedStructuredEntitiesAxis_019e223a-ee54-7792-bb4e-14c478825196" xlink:to="loc_ifrs-full_ConsolidatedStructuredEntitiesDomain_019e223a-ee54-7792-bb4e-14c478825196_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ConsolidatedStructuredEntitiesDomain_019e223a-ee54-752c-9160-eb8e00a7eac2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ConsolidatedStructuredEntitiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_ConsolidatedStructuredEntitiesAxis_019e223a-ee54-7792-bb4e-14c478825196" xlink:to="loc_ifrs-full_ConsolidatedStructuredEntitiesDomain_019e223a-ee54-752c-9160-eb8e00a7eac2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BrookfieldSponsoredPartnershipMember_019e223a-ee54-7947-b4c9-7209483e3e8c" xlink:href="bip-20260630.xsd#bip_BrookfieldSponsoredPartnershipMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ConsolidatedStructuredEntitiesDomain_019e223a-ee54-752c-9160-eb8e00a7eac2" xlink:to="loc_bip_BrookfieldSponsoredPartnershipMember_019e223a-ee54-7947-b4c9-7209483e3e8c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_TheFincosMember_019e7345-9707-72b9-95eb-e2d9d096afb4" xlink:href="bip-20260630.xsd#bip_TheFincosMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ConsolidatedStructuredEntitiesDomain_019e223a-ee54-752c-9160-eb8e00a7eac2" xlink:to="loc_bip_TheFincosMember_019e7345-9707-72b9-95eb-e2d9d096afb4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BIPCHoldingsMember_019e223a-ee54-7ffe-a2bd-ccf94da92a59" xlink:href="bip-20260630.xsd#bip_BIPCHoldingsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ConsolidatedStructuredEntitiesDomain_019e223a-ee54-752c-9160-eb8e00a7eac2" xlink:to="loc_bip_BIPCHoldingsMember_019e223a-ee54-7ffe-a2bd-ccf94da92a59" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SubsidiariesOfOurPartnershipOtherThanTheFincosAndBIPICMember_019e223a-ee54-717a-9103-ea0f6b2e076e" xlink:href="bip-20260630.xsd#bip_SubsidiariesOfOurPartnershipOtherThanTheFincosAndBIPICMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ConsolidatedStructuredEntitiesDomain_019e223a-ee54-752c-9160-eb8e00a7eac2" xlink:to="loc_bip_SubsidiariesOfOurPartnershipOtherThanTheFincosAndBIPICMember_019e223a-ee54-717a-9103-ea0f6b2e076e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ConsolidatingAdjustmentsMember_019e223a-ee54-769a-a5b4-d36214a2383c" xlink:href="bip-20260630.xsd#bip_ConsolidatingAdjustmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ConsolidatedStructuredEntitiesDomain_019e223a-ee54-752c-9160-eb8e00a7eac2" xlink:to="loc_bip_ConsolidatingAdjustmentsMember_019e223a-ee54-769a-a5b4-d36214a2383c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfComprehensiveIncomeAbstract_019e223a-ee54-7761-bb2d-3eedf9fa1413" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfComprehensiveIncomeAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems_019e223a-ee54-70ca-b717-8c1d841f859a" xlink:to="loc_ifrs-full_StatementOfComprehensiveIncomeAbstract_019e223a-ee54-7761-bb2d-3eedf9fa1413" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue_019e223a-ee54-7320-a585-1c54b68a1d99" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Revenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfComprehensiveIncomeAbstract_019e223a-ee54-7761-bb2d-3eedf9fa1413" xlink:to="loc_ifrs-full_Revenue_019e223a-ee54-7320-a585-1c54b68a1d99" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NetIncomeLossAttributableToPartnership_019e223a-ee54-70e2-b6ca-f7c430db175a" xlink:href="bip-20260630.xsd#bip_NetIncomeLossAttributableToPartnership"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfComprehensiveIncomeAbstract_019e223a-ee54-7761-bb2d-3eedf9fa1413" xlink:to="loc_bip_NetIncomeLossAttributableToPartnership_019e223a-ee54-70e2-b6ca-f7c430db175a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_StatementOfFinancialPositionAbstract_019e223a-ee54-74c5-97f7-e95a301d0679" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_StatementOfFinancialPositionAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfInformationAboutConsolidatedStructuredEntitiesLineItems_019e223a-ee54-70ca-b717-8c1d841f859a" xlink:to="loc_ifrs-full_StatementOfFinancialPositionAbstract_019e223a-ee54-74c5-97f7-e95a301d0679" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentAssets_019e223a-ee54-754b-9819-c19170651694" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfFinancialPositionAbstract_019e223a-ee54-74c5-97f7-e95a301d0679" xlink:to="loc_ifrs-full_CurrentAssets_019e223a-ee54-754b-9819-c19170651694" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentAssets_019e223a-ee54-7070-8c50-3650cfacd7e1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfFinancialPositionAbstract_019e223a-ee54-74c5-97f7-e95a301d0679" xlink:to="loc_ifrs-full_NoncurrentAssets_019e223a-ee54-7070-8c50-3650cfacd7e1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CurrentLiabilities_019e223a-ee54-749f-a19a-fc27622eabc4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfFinancialPositionAbstract_019e223a-ee54-74c5-97f7-e95a301d0679" xlink:to="loc_ifrs-full_CurrentLiabilities_019e223a-ee54-749f-a19a-fc27622eabc4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NoncurrentLiabilities_019e223a-ee54-72be-ac6c-1c280bd4ce11" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NoncurrentLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfFinancialPositionAbstract_019e223a-ee54-74c5-97f7-e95a301d0679" xlink:to="loc_ifrs-full_NoncurrentLiabilities_019e223a-ee54-72be-ac6c-1c280bd4ce11" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_RedeemableNoncontrollingInterestEquityCarryingAmount1_019e223a-ee54-78f3-8baf-dff9c2255f31" xlink:href="bip-20260630.xsd#bip_RedeemableNoncontrollingInterestEquityCarryingAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfFinancialPositionAbstract_019e223a-ee54-74c5-97f7-e95a301d0679" xlink:to="loc_bip_RedeemableNoncontrollingInterestEquityCarryingAmount1_019e223a-ee54-78f3-8baf-dff9c2255f31" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonControllingInterestExchangeableSharesEquity_019e223a-ee54-7364-acd1-c3a83910ed65" xlink:href="bip-20260630.xsd#bip_NonControllingInterestExchangeableSharesEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfFinancialPositionAbstract_019e223a-ee54-74c5-97f7-e95a301d0679" xlink:to="loc_bip_NonControllingInterestExchangeableSharesEquity_019e223a-ee54-7364-acd1-c3a83910ed65" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NoncontrollinginterestExchangeLPunitsequity_019e223a-ee54-7b01-83cf-9af9afc4ef4f" xlink:href="bip-20260630.xsd#bip_NoncontrollinginterestExchangeLPunitsequity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfFinancialPositionAbstract_019e223a-ee54-74c5-97f7-e95a301d0679" xlink:to="loc_bip_NoncontrollinginterestExchangeLPunitsequity_019e223a-ee54-7b01-83cf-9af9afc4ef4f" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PerpetualSubordinatedNotes_019e223a-ee54-72da-a520-ca093a28a251" xlink:href="bip-20260630.xsd#bip_PerpetualSubordinatedNotes"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfFinancialPositionAbstract_019e223a-ee54-74c5-97f7-e95a301d0679" xlink:to="loc_bip_PerpetualSubordinatedNotes_019e223a-ee54-72da-a520-ca093a28a251" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_OtherNoncontrollingInterests1_019e223a-ee54-7882-98f7-0536cc3e5bd2" xlink:href="bip-20260630.xsd#bip_OtherNoncontrollingInterests1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfFinancialPositionAbstract_019e223a-ee54-74c5-97f7-e95a301d0679" xlink:to="loc_bip_OtherNoncontrollingInterests1_019e223a-ee54-7882-98f7-0536cc3e5bd2" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PreferredUnitholdersCapitalAccount_019e223a-ee54-734f-8271-275babd83437" xlink:href="bip-20260630.xsd#bip_PreferredUnitholdersCapitalAccount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_StatementOfFinancialPositionAbstract_019e223a-ee54-74c5-97f7-e95a301d0679" xlink:to="loc_bip_PreferredUnitholdersCapitalAccount_019e223a-ee54-734f-8271-275babd83437" xlink:type="arc" order="10"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/REVENUEDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#REVENUEDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/REVENUEDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ee54-7cb3-9672-4b3b959c1d07" 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_019e223a-ee54-752b-ae66-0cc102aef4d0" 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_019e223a-ee54-7cb3-9672-4b3b959c1d07" xlink:to="loc_ifrs-full_DisclosureOfOperatingSegmentsTable_019e223a-ee54-752b-ae66-0cc102aef4d0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsAxis_019e223a-ee54-7e6e-921e-e103a50cef20" 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_019e223a-ee54-752b-ae66-0cc102aef4d0" xlink:to="loc_ifrs-full_SegmentsAxis_019e223a-ee54-7e6e-921e-e103a50cef20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_019e223a-ee54-7e6e-921e-e103a50cef20_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_019e223a-ee54-7e6e-921e-e103a50cef20" xlink:to="loc_ifrs-full_SegmentsDomain_019e223a-ee54-7e6e-921e-e103a50cef20_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SegmentsDomain_019e223a-ee54-7852-add2-7b807ae662c5" 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_019e223a-ee54-7e6e-921e-e103a50cef20" xlink:to="loc_ifrs-full_SegmentsDomain_019e223a-ee54-7852-add2-7b807ae662c5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_UtilitiesMember_019e223a-ee54-7b0d-aea7-3ca4824f70bd" xlink:href="bip-20260630.xsd#bip_UtilitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ee54-7852-add2-7b807ae662c5" xlink:to="loc_bip_UtilitiesMember_019e223a-ee54-7b0d-aea7-3ca4824f70bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MidstreamMember_019e223a-ee54-75fc-bae6-b1287045684e" xlink:href="bip-20260630.xsd#bip_MidstreamMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ee54-7852-add2-7b807ae662c5" xlink:to="loc_bip_MidstreamMember_019e223a-ee54-75fc-bae6-b1287045684e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DataInfrastructureMember_019e223a-ee54-750a-a769-f1755fff7e7b" xlink:href="bip-20260630.xsd#bip_DataInfrastructureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ee54-7852-add2-7b807ae662c5" xlink:to="loc_bip_DataInfrastructureMember_019e223a-ee54-750a-a769-f1755fff7e7b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_TransportMember_019e223a-ee54-7af1-8d34-c5fc665219a8" xlink:href="bip-20260630.xsd#bip_TransportMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_SegmentsDomain_019e223a-ee54-7852-add2-7b807ae662c5" xlink:to="loc_bip_TransportMember_019e223a-ee54-7af1-8d34-c5fc665219a8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue_019e223a-ee54-71ed-b2b7-8c0f048d1631" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Revenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfOperatingSegmentsLineItems_019e223a-ee54-7cb3-9672-4b3b959c1d07" xlink:to="loc_ifrs-full_Revenue_019e223a-ee54-71ed-b2b7-8c0f048d1631" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/REVENUEGeographicInformationDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#REVENUEGeographicInformationDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/REVENUEGeographicInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfGeographicalAreasLineItems_019e223a-ee54-70c1-9d0c-d69433571d1d" 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_019e223a-ee54-75b1-be71-ede826e6e502" 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_019e223a-ee54-70c1-9d0c-d69433571d1d" xlink:to="loc_ifrs-full_DisclosureOfGeographicalAreasTable_019e223a-ee54-75b1-be71-ede826e6e502" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasAxis_019e223a-ee54-757e-9b89-fb7d7a644c86" 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_019e223a-ee54-75b1-be71-ede826e6e502" xlink:to="loc_ifrs-full_GeographicalAreasAxis_019e223a-ee54-757e-9b89-fb7d7a644c86" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasDomain_019e223a-ee54-757e-9b89-fb7d7a644c86_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_019e223a-ee54-757e-9b89-fb7d7a644c86" xlink:to="loc_ifrs-full_GeographicalAreasDomain_019e223a-ee54-757e-9b89-fb7d7a644c86_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GeographicalAreasDomain_019e223a-ee54-7e50-ad53-457fa99041c1" 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_019e223a-ee54-757e-9b89-fb7d7a644c86" xlink:to="loc_ifrs-full_GeographicalAreasDomain_019e223a-ee54-7e50-ad53-457fa99041c1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_019e223a-ee54-7202-9df6-417f8771feb1" 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_019e223a-ee54-7e50-ad53-457fa99041c1" xlink:to="loc_country_US_019e223a-ee54-7202-9df6-417f8771feb1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CA_019e223a-ee54-717b-9f82-76b23ad2a282" 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_ifrs-full_GeographicalAreasDomain_019e223a-ee54-7e50-ad53-457fa99041c1" xlink:to="loc_country_CA_019e223a-ee54-717b-9f82-76b23ad2a282" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IN_019e223a-ee54-7b84-8f65-0c6d792e6910" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_IN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_019e223a-ee54-7e50-ad53-457fa99041c1" xlink:to="loc_country_IN_019e223a-ee54-7b84-8f65-0c6d792e6910" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_019e223a-ee54-7f44-b510-b47f2a613806" 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_019e223a-ee54-7e50-ad53-457fa99041c1" xlink:to="loc_country_GB_019e223a-ee54-7f44-b510-b47f2a613806" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_BR_019e223a-ee54-7188-b425-00db4e73f942" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_BR"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_019e223a-ee54-7e50-ad53-457fa99041c1" xlink:to="loc_country_BR_019e223a-ee54-7188-b425-00db4e73f942" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CO_019e223a-ee54-7a4c-9253-47253f884449" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_CO"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_019e223a-ee54-7e50-ad53-457fa99041c1" xlink:to="loc_country_CO_019e223a-ee54-7a4c-9253-47253f884449" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_FR_019e223a-ee54-736a-84b1-549248be6e06" 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_ifrs-full_GeographicalAreasDomain_019e223a-ee54-7e50-ad53-457fa99041c1" xlink:to="loc_country_FR_019e223a-ee54-736a-84b1-549248be6e06" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_AU_019e223a-ee54-73d2-a1be-356774c8f80c" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_AU"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_019e223a-ee54-7e50-ad53-457fa99041c1" xlink:to="loc_country_AU_019e223a-ee54-73d2-a1be-356774c8f80c" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_DE_019e223a-ee54-7461-b9e0-82372697d4ed" xlink:href="https://xbrl.sec.gov/country/2025/country-2025.xsd#country_DE"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_019e223a-ee54-7e50-ad53-457fa99041c1" xlink:to="loc_country_DE_019e223a-ee54-7461-b9e0-82372697d4ed" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AggregatedIndividuallyImmaterialGeographicalAreasMember_019e223a-ee54-7519-bfe9-93b69bf348da" xlink:href="bip-20260630.xsd#bip_AggregatedIndividuallyImmaterialGeographicalAreasMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_GeographicalAreasDomain_019e223a-ee54-7e50-ad53-457fa99041c1" xlink:to="loc_bip_AggregatedIndividuallyImmaterialGeographicalAreasMember_019e223a-ee54-7519-bfe9-93b69bf348da" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Revenue_019e223a-ee54-7928-93f4-90fc6890d3e4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Revenue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfGeographicalAreasLineItems_019e223a-ee54-70c1-9d0c-d69433571d1d" xlink:to="loc_ifrs-full_Revenue_019e223a-ee54-7928-93f4-90fc6890d3e4" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/PARTNERSHIPCAPITALCapitalCategoriesDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#PARTNERSHIPCAPITALCapitalCategoriesDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/PARTNERSHIPCAPITALCapitalCategoriesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7396-4b77-7a97-81ad-3dcf8e1f8092" xlink:href="bip-20260630.xsd#bip_ScheduleOfPartnershipUnitsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ScheduleofPartnershipUnitsTable_019e7396-4b77-72de-9c69-a226e43cab53" xlink:href="bip-20260630.xsd#bip_ScheduleofPartnershipUnitsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7396-4b77-7a97-81ad-3dcf8e1f8092" xlink:to="loc_bip_ScheduleofPartnershipUnitsTable_019e7396-4b77-72de-9c69-a226e43cab53" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Axis_019e7396-4b77-7eed-80ba-5c08da66bb74" xlink:href="bip-20260630.xsd#bip_PartnerType1Axis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_bip_ScheduleofPartnershipUnitsTable_019e7396-4b77-72de-9c69-a226e43cab53" xlink:to="loc_bip_PartnerType1Axis_019e7396-4b77-7eed-80ba-5c08da66bb74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Domain_019e7396-4b77-7eed-80ba-5c08da66bb74_default" xlink:href="bip-20260630.xsd#bip_PartnerType1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_bip_PartnerType1Axis_019e7396-4b77-7eed-80ba-5c08da66bb74" xlink:to="loc_bip_PartnerType1Domain_019e7396-4b77-7eed-80ba-5c08da66bb74_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Domain_019e7396-4b77-7168-9306-341c579100c3" xlink:href="bip-20260630.xsd#bip_PartnerType1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_bip_PartnerType1Axis_019e7396-4b77-7eed-80ba-5c08da66bb74" xlink:to="loc_bip_PartnerType1Domain_019e7396-4b77-7168-9306-341c579100c3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SpecialGeneralPartnerMember_019e7396-4b77-7a3c-9511-bc92593c409e" xlink:href="bip-20260630.xsd#bip_SpecialGeneralPartnerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e7396-4b77-7168-9306-341c579100c3" xlink:to="loc_bip_SpecialGeneralPartnerMember_019e7396-4b77-7a3c-9511-bc92593c409e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_LimitedPartners1Member_019e7396-aee4-758c-8b85-49dd051bd3ee" xlink:href="bip-20260630.xsd#bip_LimitedPartners1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e7396-4b77-7168-9306-341c579100c3" xlink:to="loc_bip_LimitedPartners1Member_019e7396-aee4-758c-8b85-49dd051bd3ee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonControllingInterestRedeemablePartnershipUnitsMember_019e7397-05f3-7e7c-b72b-ec35e9585081" xlink:href="bip-20260630.xsd#bip_NonControllingInterestRedeemablePartnershipUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e7396-4b77-7168-9306-341c579100c3" xlink:to="loc_bip_NonControllingInterestRedeemablePartnershipUnitsMember_019e7397-05f3-7e7c-b72b-ec35e9585081" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonControllingInterestExchangeableSharesEquityMember_019e7397-41dc-762d-ba46-9c57c18a617f" xlink:href="bip-20260630.xsd#bip_NonControllingInterestExchangeableSharesEquityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e7396-4b77-7168-9306-341c579100c3" xlink:to="loc_bip_NonControllingInterestExchangeableSharesEquityMember_019e7397-41dc-762d-ba46-9c57c18a617f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NoncontrollingInterestExchangeLPUnitsequityMember_019e7397-679f-79db-8e65-c86b3f2c1366" xlink:href="bip-20260630.xsd#bip_NoncontrollingInterestExchangeLPUnitsequityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e7396-4b77-7168-9306-341c579100c3" xlink:to="loc_bip_NoncontrollingInterestExchangeLPUnitsequityMember_019e7397-679f-79db-8e65-c86b3f2c1366" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_019e7396-4b77-744a-aa3b-9a56bc695126" 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_bip_ScheduleofPartnershipUnitsTable_019e7396-4b77-72de-9c69-a226e43cab53" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_019e7396-4b77-744a-aa3b-9a56bc695126" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019e7396-4b77-744a-aa3b-9a56bc695126_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_019e7396-4b77-744a-aa3b-9a56bc695126" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019e7396-4b77-744a-aa3b-9a56bc695126_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019e7396-4b77-70c8-bb4e-d71754e29ec1" 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_019e7396-4b77-744a-aa3b-9a56bc695126" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019e7396-4b77-70c8-bb4e-d71754e29ec1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapitalMember_019e7396-4b77-7394-9ef3-cc3ab095c236" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019e7396-4b77-70c8-bb4e-d71754e29ec1" xlink:to="loc_ifrs-full_IssuedCapitalMember_019e7396-4b77-7394-9ef3-cc3ab095c236" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PerpetualSubordinatedNotesMember_019e7397-8aa7-707a-8c3d-82f929a1516a" xlink:href="bip-20260630.xsd#bip_PerpetualSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019e7396-4b77-70c8-bb4e-d71754e29ec1" xlink:to="loc_bip_PerpetualSubordinatedNotesMember_019e7397-8aa7-707a-8c3d-82f929a1516a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PreferredUnitholdersCapitalMember_019e7397-a91c-7d40-b0f0-d7ee97006140" xlink:href="bip-20260630.xsd#bip_PreferredUnitholdersCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019e7396-4b77-70c8-bb4e-d71754e29ec1" xlink:to="loc_bip_PreferredUnitholdersCapitalMember_019e7397-a91c-7d40-b0f0-d7ee97006140" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerTypeAxis_019e739b-3d76-7426-a9b1-96653062a695" xlink:href="bip-20260630.xsd#bip_PartnerTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_bip_ScheduleofPartnershipUnitsTable_019e7396-4b77-72de-9c69-a226e43cab53" xlink:to="loc_bip_PartnerTypeAxis_019e739b-3d76-7426-a9b1-96653062a695" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerTypeDomain_019e739b-3d76-7426-a9b1-96653062a695_default" xlink:href="bip-20260630.xsd#bip_PartnerTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_bip_PartnerTypeAxis_019e739b-3d76-7426-a9b1-96653062a695" xlink:to="loc_bip_PartnerTypeDomain_019e739b-3d76-7426-a9b1-96653062a695_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerTypeDomain_019e739b-3d76-74b9-9863-c5a6c51b3d8e" xlink:href="bip-20260630.xsd#bip_PartnerTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_bip_PartnerTypeAxis_019e739b-3d76-7426-a9b1-96653062a695" xlink:to="loc_bip_PartnerTypeDomain_019e739b-3d76-74b9-9863-c5a6c51b3d8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NoncontrollingInterestClassASharesequityMember_019e739b-3d76-7d28-860b-a515f2c75730" xlink:href="bip-20260630.xsd#bip_NoncontrollingInterestClassASharesequityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerTypeDomain_019e739b-3d76-74b9-9863-c5a6c51b3d8e" xlink:to="loc_bip_NoncontrollingInterestClassASharesequityMember_019e739b-3d76-7d28-860b-a515f2c75730" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis_019e739b-3d76-7164-adc1-3bbb17b365ef" 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_bip_ScheduleofPartnershipUnitsTable_019e7396-4b77-72de-9c69-a226e43cab53" xlink:to="loc_ifrs-full_ClassesOfShareCapitalAxis_019e739b-3d76-7164-adc1-3bbb17b365ef" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_019e739b-3d76-7164-adc1-3bbb17b365ef_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_019e739b-3d76-7164-adc1-3bbb17b365ef" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_019e739b-3d76-7164-adc1-3bbb17b365ef_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_019e739b-3d76-71b6-b273-5b7dc72d094f" 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_019e739b-3d76-7164-adc1-3bbb17b365ef" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_019e739b-3d76-71b6-b273-5b7dc72d094f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ExchangeableShareMember_019e739b-3d76-7deb-b542-6778e446fb5f" xlink:href="bip-20260630.xsd#bip_ExchangeableShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_019e739b-3d76-71b6-b273-5b7dc72d094f" xlink:to="loc_bip_ExchangeableShareMember_019e739b-3d76-7deb-b542-6778e446fb5f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ClassExchangeableSharesMember_019e739b-3d76-7fc0-a433-26c9cb305204" xlink:href="bip-20260630.xsd#bip_ClassExchangeableSharesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_019e739b-3d76-71b6-b273-5b7dc72d094f" xlink:to="loc_bip_ClassExchangeableSharesMember_019e739b-3d76-7fc0-a433-26c9cb305204" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_019e7396-4b77-7821-8bbc-d8c7f8320f14" 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_bip_ScheduleOfPartnershipUnitsLineItems_019e7396-4b77-7a97-81ad-3dcf8e1f8092" xlink:to="loc_ifrs-full_Equity_019e7396-4b77-7821-8bbc-d8c7f8320f14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_019e7396-4b77-7b38-8075-4bad013eb7b7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7396-4b77-7a97-81ad-3dcf8e1f8092" xlink:to="loc_ifrs-full_NumberOfSharesOutstanding_019e7396-4b77-7b38-8075-4bad013eb7b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssueOfEquity_019e7396-aee4-7dbd-910f-fa5ca3b6740a" 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_bip_ScheduleOfPartnershipUnitsLineItems_019e7396-4b77-7a97-81ad-3dcf8e1f8092" xlink:to="loc_ifrs-full_IssueOfEquity_019e7396-aee4-7dbd-910f-fa5ca3b6740a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NumberOfSharesIssued1_019e7396-aee4-73d1-909f-d7779b92aca3" xlink:href="bip-20260630.xsd#bip_NumberOfSharesIssued1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7396-4b77-7a97-81ad-3dcf8e1f8092" xlink:to="loc_bip_NumberOfSharesIssued1_019e7396-aee4-73d1-909f-d7779b92aca3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_RepurchaseOfEquity_019e7396-aee4-71e8-9e0b-120d66b479fa" xlink:href="bip-20260630.xsd#bip_RepurchaseOfEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7396-4b77-7a97-81ad-3dcf8e1f8092" xlink:to="loc_bip_RepurchaseOfEquity_019e7396-aee4-71e8-9e0b-120d66b479fa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnersCapitalAccountUnitsTreasuryUnitsPurchased1_019e7396-aee4-7deb-8b6b-acf7bf744968" xlink:href="bip-20260630.xsd#bip_PartnersCapitalAccountUnitsTreasuryUnitsPurchased1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7396-4b77-7a97-81ad-3dcf8e1f8092" xlink:to="loc_bip_PartnersCapitalAccountUnitsTreasuryUnitsPurchased1_019e7396-aee4-7deb-8b6b-acf7bf744968" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_IssuanceOfEquityUponConversionValue_019e7396-aee4-7f61-91c0-1a7b776251e5" xlink:href="bip-20260630.xsd#bip_IssuanceOfEquityUponConversionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7396-4b77-7a97-81ad-3dcf8e1f8092" xlink:to="loc_bip_IssuanceOfEquityUponConversionValue_019e7396-aee4-7f61-91c0-1a7b776251e5" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_IssuanceOfEquityUponConversionShares_019e7396-aee4-7f23-b328-41da48ce4e9d" xlink:href="bip-20260630.xsd#bip_IssuanceOfEquityUponConversionShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7396-4b77-7a97-81ad-3dcf8e1f8092" xlink:to="loc_bip_IssuanceOfEquityUponConversionShares_019e7396-aee4-7f23-b328-41da48ce4e9d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ExchangeableLPConvertedToExchangeableValue_019e7397-679f-71a4-8dcd-29fa621d1b2c" xlink:href="bip-20260630.xsd#bip_ExchangeableLPConvertedToExchangeableValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7396-4b77-7a97-81ad-3dcf8e1f8092" xlink:to="loc_bip_ExchangeableLPConvertedToExchangeableValue_019e7397-679f-71a4-8dcd-29fa621d1b2c" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ExchangeableLPConvertedToExchangeableShares_019e7397-679f-7f8b-8317-2afc25e5bb25" xlink:href="bip-20260630.xsd#bip_ExchangeableLPConvertedToExchangeableShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7396-4b77-7a97-81ad-3dcf8e1f8092" xlink:to="loc_bip_ExchangeableLPConvertedToExchangeableShares_019e7397-679f-7f8b-8317-2afc25e5bb25" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_019e7396-68a3-7346-9729-b4bf77356936" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Equity"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_019e7398-7044-7ead-8799-6c7f3a4aeba3" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/PARTNERSHIPCAPITALAdditionalInformationDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#PARTNERSHIPCAPITALAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/PARTNERSHIPCAPITALAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:href="bip-20260630.xsd#bip_ScheduleOfPartnershipUnitsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ScheduleofPartnershipUnitsTable_019e7392-b386-7f62-880e-3ca3e7fa2b42" xlink:href="bip-20260630.xsd#bip_ScheduleofPartnershipUnitsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_ScheduleofPartnershipUnitsTable_019e7392-b386-7f62-880e-3ca3e7fa2b42" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Axis_019e7392-b386-725c-875f-34d96a84949f" xlink:href="bip-20260630.xsd#bip_PartnerType1Axis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_bip_ScheduleofPartnershipUnitsTable_019e7392-b386-7f62-880e-3ca3e7fa2b42" xlink:to="loc_bip_PartnerType1Axis_019e7392-b386-725c-875f-34d96a84949f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Domain_019e7392-b386-725c-875f-34d96a84949f_default" xlink:href="bip-20260630.xsd#bip_PartnerType1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_bip_PartnerType1Axis_019e7392-b386-725c-875f-34d96a84949f" xlink:to="loc_bip_PartnerType1Domain_019e7392-b386-725c-875f-34d96a84949f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Domain_019e7392-b386-7900-8e28-9e9fb54d6f8a" xlink:href="bip-20260630.xsd#bip_PartnerType1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_bip_PartnerType1Axis_019e7392-b386-725c-875f-34d96a84949f" xlink:to="loc_bip_PartnerType1Domain_019e7392-b386-7900-8e28-9e9fb54d6f8a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_LimitedPartners1Member_019e7392-b386-7a5e-8c96-0fc83cec211f" xlink:href="bip-20260630.xsd#bip_LimitedPartners1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e7392-b386-7900-8e28-9e9fb54d6f8a" xlink:to="loc_bip_LimitedPartners1Member_019e7392-b386-7a5e-8c96-0fc83cec211f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SpecialGeneralPartnerMember_019e7392-b386-7b21-b17b-55519c46bb48" xlink:href="bip-20260630.xsd#bip_SpecialGeneralPartnerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e7392-b386-7900-8e28-9e9fb54d6f8a" xlink:to="loc_bip_SpecialGeneralPartnerMember_019e7392-b386-7b21-b17b-55519c46bb48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonControllingInterestClassAPreferredUnitsMember_019e7392-f7fd-7a6c-bc38-2ae1b91e862a" xlink:href="bip-20260630.xsd#bip_NonControllingInterestClassAPreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e7392-b386-7900-8e28-9e9fb54d6f8a" xlink:to="loc_bip_NonControllingInterestClassAPreferredUnitsMember_019e7392-f7fd-7a6c-bc38-2ae1b91e862a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonControllingInterestExchangeBIPCLPUnitsEquityMember_019e7394-4350-73ae-a66d-344d527df027" xlink:href="bip-20260630.xsd#bip_NonControllingInterestExchangeBIPCLPUnitsEquityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e7392-b386-7900-8e28-9e9fb54d6f8a" xlink:to="loc_bip_NonControllingInterestExchangeBIPCLPUnitsEquityMember_019e7394-4350-73ae-a66d-344d527df027" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonControllingInterestExchangeableSharesEquityMember_019e7394-ab00-76ec-be4d-1e2e5eb3b032" xlink:href="bip-20260630.xsd#bip_NonControllingInterestExchangeableSharesEquityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e7392-b386-7900-8e28-9e9fb54d6f8a" xlink:to="loc_bip_NonControllingInterestExchangeableSharesEquityMember_019e7394-ab00-76ec-be4d-1e2e5eb3b032" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BIPCAtTheMarketProgramMember_019e7394-ab00-73c8-8238-9c937ce3227f" xlink:href="bip-20260630.xsd#bip_BIPCAtTheMarketProgramMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e7392-b386-7900-8e28-9e9fb54d6f8a" xlink:to="loc_bip_BIPCAtTheMarketProgramMember_019e7394-ab00-73c8-8238-9c937ce3227f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NoncontrollingInterestExchangeLPUnitsequityMember_019e7395-6876-7eb1-aa78-c77c550fc446" xlink:href="bip-20260630.xsd#bip_NoncontrollingInterestExchangeLPUnitsequityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e7392-b386-7900-8e28-9e9fb54d6f8a" xlink:to="loc_bip_NoncontrollingInterestExchangeLPUnitsequityMember_019e7395-6876-7eb1-aa78-c77c550fc446" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_019e7392-b386-7364-bd5e-48d0bb54deec" 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_bip_ScheduleofPartnershipUnitsTable_019e7392-b386-7f62-880e-3ca3e7fa2b42" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_019e7392-b386-7364-bd5e-48d0bb54deec" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019e7392-b386-7364-bd5e-48d0bb54deec_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_019e7392-b386-7364-bd5e-48d0bb54deec" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019e7392-b386-7364-bd5e-48d0bb54deec_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019e7392-b386-76bb-995f-8930ef4683ea" 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_019e7392-b386-7364-bd5e-48d0bb54deec" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019e7392-b386-76bb-995f-8930ef4683ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IssuedCapitalMember_019e7392-b386-743f-9eb0-6d6728c7e655" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IssuedCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019e7392-b386-76bb-995f-8930ef4683ea" xlink:to="loc_ifrs-full_IssuedCapitalMember_019e7392-b386-743f-9eb0-6d6728c7e655" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PerpetualSubordinatedNotesMember_019e7395-a8ae-71bb-be7c-9dfcf0db7d75" xlink:href="bip-20260630.xsd#bip_PerpetualSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019e7392-b386-76bb-995f-8930ef4683ea" xlink:to="loc_bip_PerpetualSubordinatedNotesMember_019e7395-a8ae-71bb-be7c-9dfcf0db7d75" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PreferredUnitholdersCapitalMember_019e7395-c5cf-729c-a830-131c24bd27e4" xlink:href="bip-20260630.xsd#bip_PreferredUnitholdersCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019e7392-b386-76bb-995f-8930ef4683ea" xlink:to="loc_bip_PreferredUnitholdersCapitalMember_019e7395-c5cf-729c-a830-131c24bd27e4" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalAxis_019e7395-a8ae-704b-a710-8e0086617627" 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_bip_ScheduleofPartnershipUnitsTable_019e7392-b386-7f62-880e-3ca3e7fa2b42" xlink:to="loc_ifrs-full_ClassesOfShareCapitalAxis_019e7395-a8ae-704b-a710-8e0086617627" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_019e7395-a8ae-704b-a710-8e0086617627_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_019e7395-a8ae-704b-a710-8e0086617627" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_019e7395-a8ae-704b-a710-8e0086617627_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ClassesOfShareCapitalDomain_019e7395-a8ae-7f6e-8a39-3e9abfcfecf4" 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_019e7395-a8ae-704b-a710-8e0086617627" xlink:to="loc_ifrs-full_ClassesOfShareCapitalDomain_019e7395-a8ae-7f6e-8a39-3e9abfcfecf4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_Series7PreferredUnitsMember_019e7395-a8ae-7227-b96c-107cf409390e" xlink:href="bip-20260630.xsd#bip_Series7PreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_019e7395-a8ae-7f6e-8a39-3e9abfcfecf4" xlink:to="loc_bip_Series7PreferredUnitsMember_019e7395-a8ae-7227-b96c-107cf409390e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_Series14PreferredUnitsMember_019e7395-a8ae-733a-b7d7-497a2dcb69da" xlink:href="bip-20260630.xsd#bip_Series14PreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_019e7395-a8ae-7f6e-8a39-3e9abfcfecf4" xlink:to="loc_bip_Series14PreferredUnitsMember_019e7395-a8ae-733a-b7d7-497a2dcb69da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_Series1PreferredUnitsMember_019e7395-c5cf-7260-aed8-b01cb9aeee6f" xlink:href="bip-20260630.xsd#bip_Series1PreferredUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ClassesOfShareCapitalDomain_019e7395-a8ae-7f6e-8a39-3e9abfcfecf4" xlink:to="loc_bip_Series1PreferredUnitsMember_019e7395-c5cf-7260-aed8-b01cb9aeee6f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_WeightedAverageShares_019e7392-b386-74c0-8d2a-0d67d0d70541" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_WeightedAverageShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_ifrs-full_WeightedAverageShares_019e7392-b386-74c0-8d2a-0d67d0d70541" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_StockIssuedDuringPeriodSharesDividendReinvestmentPlan1_019e7392-d186-7eb4-8cfb-08183572ab2a" xlink:href="bip-20260630.xsd#bip_StockIssuedDuringPeriodSharesDividendReinvestmentPlan1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_StockIssuedDuringPeriodSharesDividendReinvestmentPlan1_019e7392-d186-7eb4-8cfb-08183572ab2a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ProceedsFromIssuanceofCommonStockDividendReinvestmentPlan_019e7392-d186-791f-b16f-c53ea1872523" xlink:href="bip-20260630.xsd#bip_ProceedsFromIssuanceofCommonStockDividendReinvestmentPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_ProceedsFromIssuanceofCommonStockDividendReinvestmentPlan_019e7392-d186-791f-b16f-c53ea1872523" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_RepurchaseAuthorizedPercentage_019e7392-f7fd-777d-8aed-650535de31fa" xlink:href="bip-20260630.xsd#bip_RepurchaseAuthorizedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_RepurchaseAuthorizedPercentage_019e7392-f7fd-777d-8aed-650535de31fa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesOutstanding_019e7392-f7fd-76f2-803d-bfcb20df516b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_ifrs-full_NumberOfSharesOutstanding_019e7392-f7fd-76f2-803d-bfcb20df516b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NumberOfSharesIssued_019e7392-f7fd-7f25-bee0-44d7202aa5d4" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NumberOfSharesIssued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_ifrs-full_NumberOfSharesIssued_019e7392-f7fd-7f25-bee0-44d7202aa5d4" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_MaximumPercentageForPublicFloat_019e7392-f7fd-7234-9133-32f832d64b85" xlink:href="bip-20260630.xsd#bip_MaximumPercentageForPublicFloat"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_MaximumPercentageForPublicFloat_019e7392-f7fd-7234-9133-32f832d64b85" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnersCapitalAccountUnitsTreasuryUnitsPurchased1_019e7393-4fe8-7441-ac2c-161ad1d66755" xlink:href="bip-20260630.xsd#bip_PartnersCapitalAccountUnitsTreasuryUnitsPurchased1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_PartnersCapitalAccountUnitsTreasuryUnitsPurchased1_019e7393-4fe8-7441-ac2c-161ad1d66755" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnersCapitalAccountValueTreasuryUnitsPurchased1_019e7393-4fe8-779b-b5b5-45fdccca17e4" xlink:href="bip-20260630.xsd#bip_PartnersCapitalAccountValueTreasuryUnitsPurchased1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_PartnersCapitalAccountValueTreasuryUnitsPurchased1_019e7393-4fe8-779b-b5b5-45fdccca17e4" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_QuarterlyDividendsRecognisedAsDistributionsToOwnersPerShare_019e7394-1f9c-7655-9810-e895d14b53fa" xlink:href="bip-20260630.xsd#bip_QuarterlyDividendsRecognisedAsDistributionsToOwnersPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_QuarterlyDividendsRecognisedAsDistributionsToOwnersPerShare_019e7394-1f9c-7655-9810-e895d14b53fa" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_QuarterlyDividendRecognisedAsDistributionsToOwnersAnnualRatePercent_019e7394-1f9c-74c9-9ea0-acb6dd6b87d2" xlink:href="bip-20260630.xsd#bip_QuarterlyDividendRecognisedAsDistributionsToOwnersAnnualRatePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_QuarterlyDividendRecognisedAsDistributionsToOwnersAnnualRatePercent_019e7394-1f9c-74c9-9ea0-acb6dd6b87d2" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ExchangeableLPConvertedToExchangeableShares_019e7394-4350-7541-abfd-c807b8d14bc0" xlink:href="bip-20260630.xsd#bip_ExchangeableLPConvertedToExchangeableShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_ExchangeableLPConvertedToExchangeableShares_019e7394-4350-7541-abfd-c807b8d14bc0" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ExchangeableLPConvertedToExchangeableValue_019e7394-4350-7260-951b-f97cd647cae6" xlink:href="bip-20260630.xsd#bip_ExchangeableLPConvertedToExchangeableValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_ExchangeableLPConvertedToExchangeableValue_019e7394-4350-7260-951b-f97cd647cae6" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NumberOfSharesIssued1_019e7394-ab00-7d5d-92fb-05c72329b1d5" xlink:href="bip-20260630.xsd#bip_NumberOfSharesIssued1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_NumberOfSharesIssued1_019e7394-ab00-7d5d-92fb-05c72329b1d5" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AveragePriceOfCapitalIssuedToShareholders_019e7394-ab00-7a37-bade-006765d5413a" xlink:href="bip-20260630.xsd#bip_AveragePriceOfCapitalIssuedToShareholders"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_AveragePriceOfCapitalIssuedToShareholders_019e7394-ab00-7a37-bade-006765d5413a" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ProceedsFromIssuanceOfExchangeableSharesGross_019e7394-ab00-7ed0-9697-a471e1c863d1" xlink:href="bip-20260630.xsd#bip_ProceedsFromIssuanceOfExchangeableSharesGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_ProceedsFromIssuanceOfExchangeableSharesGross_019e7394-ab00-7ed0-9697-a471e1c863d1" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ProceedsFromIssuanceOfExchangeableSharesNet_019e7394-ab00-7ff1-8bc1-346caf75a9aa" xlink:href="bip-20260630.xsd#bip_ProceedsFromIssuanceOfExchangeableSharesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_ProceedsFromIssuanceOfExchangeableSharesNet_019e7394-ab00-7ff1-8bc1-346caf75a9aa" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AgentCommissionCosts_019e7394-ab00-7848-9ca5-328caf7c6ab8" xlink:href="bip-20260630.xsd#bip_AgentCommissionCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_AgentCommissionCosts_019e7394-ab00-7848-9ca5-328caf7c6ab8" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ExchangeLPunitconversionshares_019e7395-6876-700e-934b-f4fa7ab6df5e" xlink:href="bip-20260630.xsd#bip_ExchangeLPunitconversionshares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_ExchangeLPunitconversionshares_019e7395-6876-700e-934b-f4fa7ab6df5e" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SharesIssuedDuringPeriodPricePerShare_019e7395-a8ae-7bf5-86ef-936cb7bde41f" xlink:href="bip-20260630.xsd#bip_SharesIssuedDuringPeriodPricePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_SharesIssuedDuringPeriodPricePerShare_019e7395-a8ae-7bf5-86ef-936cb7bde41f" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PreferredStockDividendRate_019e7395-a8ae-76e0-b699-a07f432248e4" xlink:href="bip-20260630.xsd#bip_PreferredStockDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_PreferredStockDividendRate_019e7395-a8ae-76e0-b699-a07f432248e4" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_RepurchaseofPreferredEquity_019e7395-c5cf-7646-8156-49fb9a02acc7" xlink:href="bip-20260630.xsd#bip_RepurchaseofPreferredEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_RepurchaseofPreferredEquity_019e7395-c5cf-7646-8156-49fb9a02acc7" xlink:type="arc" order="21"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_GainOnRedemptionOfEquityInstruments_019e7395-c5cf-7296-869c-03a10159c3cc" xlink:href="bip-20260630.xsd#bip_GainOnRedemptionOfEquityInstruments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_ScheduleOfPartnershipUnitsLineItems_019e7392-b386-7309-998b-ecf16bb67ca7" xlink:to="loc_bip_GainOnRedemptionOfEquityInstruments_019e7395-c5cf-7296-869c-03a10159c3cc" xlink:type="arc" order="22"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/DISTRIBUTIONSDISTRIBUTIONSDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#DISTRIBUTIONSDISTRIBUTIONSDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/DISTRIBUTIONSDISTRIBUTIONSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019e72f9-1f09-7cd2-81b8-bdde93e256d2" 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_019e72f9-1f09-7ca2-a74f-26171d873417" 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_019e72f9-1f09-7cd2-81b8-bdde93e256d2" xlink:to="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_019e72f9-1f09-7ca2-a74f-26171d873417" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Axis_019e72f9-1f09-7824-8c90-f9e85631a813" xlink:href="bip-20260630.xsd#bip_PartnerType1Axis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalTable_019e72f9-1f09-7ca2-a74f-26171d873417" xlink:to="loc_bip_PartnerType1Axis_019e72f9-1f09-7824-8c90-f9e85631a813" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Domain_019e72f9-1f09-7824-8c90-f9e85631a813_default" xlink:href="bip-20260630.xsd#bip_PartnerType1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_bip_PartnerType1Axis_019e72f9-1f09-7824-8c90-f9e85631a813" xlink:to="loc_bip_PartnerType1Domain_019e72f9-1f09-7824-8c90-f9e85631a813_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Domain_019e72f9-1f09-7b39-9cc1-5a3ba0e59c7d" xlink:href="bip-20260630.xsd#bip_PartnerType1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_bip_PartnerType1Axis_019e72f9-1f09-7824-8c90-f9e85631a813" xlink:to="loc_bip_PartnerType1Domain_019e72f9-1f09-7b39-9cc1-5a3ba0e59c7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_LimitedPartners1Member_019e72f9-1f09-769f-af48-d861d4f87159" xlink:href="bip-20260630.xsd#bip_LimitedPartners1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e72f9-1f09-7b39-9cc1-5a3ba0e59c7d" xlink:to="loc_bip_LimitedPartners1Member_019e72f9-1f09-769f-af48-d861d4f87159" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_GeneralPartner1Member_019e72f9-1f09-718e-8c70-e84384ed712f" xlink:href="bip-20260630.xsd#bip_GeneralPartner1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e72f9-1f09-7b39-9cc1-5a3ba0e59c7d" xlink:to="loc_bip_GeneralPartner1Member_019e72f9-1f09-718e-8c70-e84384ed712f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NoncontrollingInterestRedeemablePartnershipUnitsMember_019e72f9-1f09-7947-bd06-0727fda83ef2" xlink:href="bip-20260630.xsd#bip_NoncontrollingInterestRedeemablePartnershipUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e72f9-1f09-7b39-9cc1-5a3ba0e59c7d" xlink:to="loc_bip_NoncontrollingInterestRedeemablePartnershipUnitsMember_019e72f9-1f09-7947-bd06-0727fda83ef2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SpecialGeneralPartnerMember_019e72fc-645f-7007-b92a-6ea687313de3" xlink:href="bip-20260630.xsd#bip_SpecialGeneralPartnerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e72f9-1f09-7b39-9cc1-5a3ba0e59c7d" xlink:to="loc_bip_SpecialGeneralPartnerMember_019e72fc-645f-7007-b92a-6ea687313de3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_019e72f9-1f09-7ca2-99e0-dd2298738fd5" 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_DisclosureOfClassesOfShareCapitalTable_019e72f9-1f09-7ca2-a74f-26171d873417" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_019e72f9-1f09-7ca2-99e0-dd2298738fd5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019e72f9-1f09-7ca2-99e0-dd2298738fd5_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_019e72f9-1f09-7ca2-99e0-dd2298738fd5" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019e72f9-1f09-7ca2-99e0-dd2298738fd5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019e72f9-1f09-7c00-859e-fcc5867b747d" 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_019e72f9-1f09-7ca2-99e0-dd2298738fd5" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019e72f9-1f09-7c00-859e-fcc5867b747d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonControllingInterestExchangeableSharesEquityMember_019e72f9-1f09-73e5-8e34-f00fc6b01f38" xlink:href="bip-20260630.xsd#bip_NonControllingInterestExchangeableSharesEquityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019e72f9-1f09-7c00-859e-fcc5867b747d" xlink:to="loc_bip_NonControllingInterestExchangeableSharesEquityMember_019e72f9-1f09-73e5-8e34-f00fc6b01f38" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NoncontrollingInterestExchangeLPUnitsequityMember_019e72f9-1f09-70ae-b9fd-abfec4e17fd4" xlink:href="bip-20260630.xsd#bip_NoncontrollingInterestExchangeLPUnitsequityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019e72f9-1f09-7c00-859e-fcc5867b747d" xlink:to="loc_bip_NoncontrollingInterestExchangeLPUnitsequityMember_019e72f9-1f09-70ae-b9fd-abfec4e17fd4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PreferredUnitholdersCapitalMember_019e72f9-1f09-7240-8c8c-59f02f0e4c81" xlink:href="bip-20260630.xsd#bip_PreferredUnitholdersCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019e72f9-1f09-7c00-859e-fcc5867b747d" xlink:to="loc_bip_PreferredUnitholdersCapitalMember_019e72f9-1f09-7240-8c8c-59f02f0e4c81" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PerpetualSubordinatedNotesMember_019e72f9-1f09-7661-9ca6-f2d8f792d97c" xlink:href="bip-20260630.xsd#bip_PerpetualSubordinatedNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019e72f9-1f09-7c00-859e-fcc5867b747d" xlink:to="loc_bip_PerpetualSubordinatedNotesMember_019e72f9-1f09-7661-9ca6-f2d8f792d97c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsPaid_019e72f9-1f09-73b1-ab3c-91bd2f356d19" 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_DisclosureOfClassesOfShareCapitalLineItems_019e72f9-1f09-7cd2-81b8-bdde93e256d2" xlink:to="loc_ifrs-full_DividendsPaid_019e72f9-1f09-73b1-ab3c-91bd2f356d19" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DividendsPreferredStockCash1_019e72f9-1f09-75c1-9150-b44ab5836f05" xlink:href="bip-20260630.xsd#bip_DividendsPreferredStockCash1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019e72f9-1f09-7cd2-81b8-bdde93e256d2" xlink:to="loc_bip_DividendsPreferredStockCash1_019e72f9-1f09-75c1-9150-b44ab5836f05" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DividendsRecognizedAsDistributionsToOwnersAndDividendsPreferredStockCash_019e72f9-1f09-79f9-877f-6bd9dfb31e3c" xlink:href="bip-20260630.xsd#bip_DividendsRecognizedAsDistributionsToOwnersAndDividendsPreferredStockCash"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019e72f9-1f09-7cd2-81b8-bdde93e256d2" xlink:to="loc_bip_DividendsRecognizedAsDistributionsToOwnersAndDividendsPreferredStockCash_019e72f9-1f09-79f9-877f-6bd9dfb31e3c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DividendsRecognisedAsDistributionsToOwnersPerShare_019e72fa-cd92-7c6a-819e-4550a1eab1fa" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DividendsRecognisedAsDistributionsToOwnersPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019e72f9-1f09-7cd2-81b8-bdde93e256d2" xlink:to="loc_ifrs-full_DividendsRecognisedAsDistributionsToOwnersPerShare_019e72fa-cd92-7c6a-819e-4550a1eab1fa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_DividendsPreferredStockCashPerShare_019e72fb-56e4-76d5-a772-52f5bcdc420c" xlink:href="bip-20260630.xsd#bip_DividendsPreferredStockCashPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019e72f9-1f09-7cd2-81b8-bdde93e256d2" xlink:to="loc_bip_DividendsPreferredStockCashPerShare_019e72fb-56e4-76d5-a772-52f5bcdc420c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_Dividendsrecognisedasincentivedistributionstoowners_019e72fc-645f-7d4b-8888-4fc4653d2b6d" xlink:href="bip-20260630.xsd#bip_Dividendsrecognisedasincentivedistributionstoowners"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfClassesOfShareCapitalLineItems_019e72f9-1f09-7cd2-81b8-bdde93e256d2" xlink:to="loc_bip_Dividendsrecognisedasincentivedistributionstoowners_019e72fc-645f-7d4b-8888-4fc4653d2b6d" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://bip.brookfield.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/ACCUMULATEDOTHERCOMPREHENSIVEINCOMELOSSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_019e223a-ee54-7d18-956d-3a4f1e8a22d5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable_019e223a-ee54-7ae6-94de-fa86d80eb5b1" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_019e223a-ee54-7d18-956d-3a4f1e8a22d5" xlink:to="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable_019e223a-ee54-7ae6-94de-fa86d80eb5b1" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Axis_019e223a-ee54-72c5-87ec-265668b798a2" xlink:href="bip-20260630.xsd#bip_PartnerType1Axis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable_019e223a-ee54-7ae6-94de-fa86d80eb5b1" xlink:to="loc_bip_PartnerType1Axis_019e223a-ee54-72c5-87ec-265668b798a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Domain_019e223a-ee54-72c5-87ec-265668b798a2_default" xlink:href="bip-20260630.xsd#bip_PartnerType1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_bip_PartnerType1Axis_019e223a-ee54-72c5-87ec-265668b798a2" xlink:to="loc_bip_PartnerType1Domain_019e223a-ee54-72c5-87ec-265668b798a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_PartnerType1Domain_019e223a-ee54-7f90-af5b-1ea5bc4eb0d3" xlink:href="bip-20260630.xsd#bip_PartnerType1Domain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_bip_PartnerType1Axis_019e223a-ee54-72c5-87ec-265668b798a2" xlink:to="loc_bip_PartnerType1Domain_019e223a-ee54-7f90-af5b-1ea5bc4eb0d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_LimitedPartners1Member_019e223a-ee54-7277-9c7c-64453295dd95" xlink:href="bip-20260630.xsd#bip_LimitedPartners1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e223a-ee54-7f90-af5b-1ea5bc4eb0d3" xlink:to="loc_bip_LimitedPartners1Member_019e223a-ee54-7277-9c7c-64453295dd95" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_GeneralPartner1Member_019e223a-ee54-72cf-8eca-de71a240d71d" xlink:href="bip-20260630.xsd#bip_GeneralPartner1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e223a-ee54-7f90-af5b-1ea5bc4eb0d3" xlink:to="loc_bip_GeneralPartner1Member_019e223a-ee54-72cf-8eca-de71a240d71d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NonControllingInterestRedeemablePartnershipUnitsMember_019e223a-ee54-7216-a51d-c219fd3a807e" xlink:href="bip-20260630.xsd#bip_NonControllingInterestRedeemablePartnershipUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e223a-ee54-7f90-af5b-1ea5bc4eb0d3" xlink:to="loc_bip_NonControllingInterestRedeemablePartnershipUnitsMember_019e223a-ee54-7216-a51d-c219fd3a807e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NoncontrollingInterestClassASharesequityMember_019e223a-ee54-7f40-9afe-e5c155ba55b7" xlink:href="bip-20260630.xsd#bip_NoncontrollingInterestClassASharesequityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e223a-ee54-7f90-af5b-1ea5bc4eb0d3" xlink:to="loc_bip_NoncontrollingInterestClassASharesequityMember_019e223a-ee54-7f40-9afe-e5c155ba55b7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_NoncontrollingInterestExchangeLPUnitsequityMember_019e223a-ee54-7dae-9cdd-48ad434babd8" xlink:href="bip-20260630.xsd#bip_NoncontrollingInterestExchangeLPUnitsequityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_PartnerType1Domain_019e223a-ee54-7f90-af5b-1ea5bc4eb0d3" xlink:to="loc_bip_NoncontrollingInterestExchangeLPUnitsequityMember_019e223a-ee54-7dae-9cdd-48ad434babd8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityAxis_019e223a-ee54-79d8-95ea-b66d479e9733" 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_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemTable_019e223a-ee54-7ae6-94de-fa86d80eb5b1" xlink:to="loc_ifrs-full_ComponentsOfEquityAxis_019e223a-ee54-79d8-95ea-b66d479e9733" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019e223a-ee54-79d8-95ea-b66d479e9733_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_019e223a-ee54-79d8-95ea-b66d479e9733" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019e223a-ee54-79d8-95ea-b66d479e9733_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ComponentsOfEquityDomain_019e223a-ee54-7bb9-b325-67056305bc0b" 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_019e223a-ee54-79d8-95ea-b66d479e9733" xlink:to="loc_ifrs-full_ComponentsOfEquityDomain_019e223a-ee54-7bb9-b325-67056305bc0b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_019e223a-ee54-7ed9-8f6a-6c08708ac0ab" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_ComponentsOfEquityDomain_019e223a-ee54-7bb9-b325-67056305bc0b" xlink:to="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_019e223a-ee54-7ed9-8f6a-6c08708ac0ab" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevaluationSurplusMember_019e223a-ee54-720b-947f-b30aad9cec9b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevaluationSurplusMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_019e223a-ee54-7ed9-8f6a-6c08708ac0ab" xlink:to="loc_ifrs-full_RevaluationSurplusMember_019e223a-ee54-720b-947f-b30aad9cec9b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_019e223a-ee54-75ef-80a7-94a1be9e9728" 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_AccumulatedOtherComprehensiveIncomeMember_019e223a-ee54-7ed9-8f6a-6c08708ac0ab" xlink:to="loc_ifrs-full_ReserveOfExchangeDifferencesOnTranslationMember_019e223a-ee54-75ef-80a7-94a1be9e9728" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfGainsAndLossesOnHedgingInstrumentsThatHedgeInvestmentsInEquityInstrumentsMember_019e223a-ee54-7033-aa06-d9e8fdc94404" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfGainsAndLossesOnHedgingInstrumentsThatHedgeInvestmentsInEquityInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_019e223a-ee54-7ed9-8f6a-6c08708ac0ab" xlink:to="loc_ifrs-full_ReserveOfGainsAndLossesOnHedgingInstrumentsThatHedgeInvestmentsInEquityInstrumentsMember_019e223a-ee54-7033-aa06-d9e8fdc94404" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfCashFlowHedgesMember_019e223a-ee54-7f6d-99b8-dbf41d79a2be" 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_AccumulatedOtherComprehensiveIncomeMember_019e223a-ee54-7ed9-8f6a-6c08708ac0ab" xlink:to="loc_ifrs-full_ReserveOfCashFlowHedgesMember_019e223a-ee54-7f6d-99b8-dbf41d79a2be" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember_019e223a-ee54-7024-849c-bf83e3993c20" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_019e223a-ee54-7ed9-8f6a-6c08708ac0ab" xlink:to="loc_ifrs-full_ReserveOfGainsAndLossesOnRemeasuringAvailableforsaleFinancialAssetsMember_019e223a-ee54-7024-849c-bf83e3993c20" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfRemeasurementsOfDefinedBenefitPlansMember_019e223a-ee54-7a71-9386-bf1cef498763" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfRemeasurementsOfDefinedBenefitPlansMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_019e223a-ee54-7ed9-8f6a-6c08708ac0ab" xlink:to="loc_ifrs-full_ReserveOfRemeasurementsOfDefinedBenefitPlansMember_019e223a-ee54-7a71-9386-bf1cef498763" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ReserveOfGainsAndLossesFromInvestmentsInEquityInstrumentsMember_019e223a-ee54-7779-ade2-3ced39804ec5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ReserveOfGainsAndLossesFromInvestmentsInEquityInstrumentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_AccumulatedOtherComprehensiveIncomeMember_019e223a-ee54-7ed9-8f6a-6c08708ac0ab" xlink:to="loc_ifrs-full_ReserveOfGainsAndLossesFromInvestmentsInEquityInstrumentsMember_019e223a-ee54-7779-ade2-3ced39804ec5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_019e223a-ee54-7bd5-885e-d99d47575f58" 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_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_019e223a-ee54-7d18-956d-3a4f1e8a22d5" xlink:to="loc_ifrs-full_Equity_019e223a-ee54-7bd5-885e-d99d47575f58" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_OtherComprehensiveIncome_019e223a-ee54-75f1-9f2d-33ae60f1ad6c" 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_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_019e223a-ee54-7d18-956d-3a4f1e8a22d5" xlink:to="loc_ifrs-full_OtherComprehensiveIncome_019e223a-ee54-75f1-9f2d-33ae60f1ad6c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_019e223a-ee54-7a1a-b058-b05e5c68860d" 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_DisclosureOfAnalysisOfOtherComprehensiveIncomeByItemLineItems_019e223a-ee54-7d18-956d-3a4f1e8a22d5" xlink:to="loc_ifrs-full_IncreaseDecreaseThroughTransfersAndOtherChangesEquity_019e223a-ee54-7a1a-b058-b05e5c68860d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Equity_019e223a-ee54-7eb6-b698-f0209e1e73c0" 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://bip.brookfield.com/role/RELATEDPARTYTRANSACTIONSDetails" xlink:type="simple" xlink:href="bip-20260630.xsd#RELATEDPARTYTRANSACTIONSDetails"/>
  <link:definitionLink xlink:role="http://bip.brookfield.com/role/RELATEDPARTYTRANSACTIONSDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_019e72f1-f9f2-7c10-ba24-c0b2403e79d2" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_019e72f1-f9f2-7c10-ba24-c0b2403e79d2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_019e72f2-514f-70cd-bcab-b024965c1677" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_019e72f1-f9f2-7c10-ba24-c0b2403e79d2" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_019e72f2-514f-70cd-bcab-b024965c1677" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_019e72f2-514f-70cd-bcab-b024965c1677_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_019e72f2-514f-70cd-bcab-b024965c1677" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_019e72f2-514f-70cd-bcab-b024965c1677_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_019e72f2-514f-7f36-a3dd-c958c6879c7c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CategoriesOfRelatedPartiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesAxis_019e72f2-514f-70cd-bcab-b024965c1677" xlink:to="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_019e72f2-514f-7f36-a3dd-c958c6879c7c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ServiceProviderAffiliateMember_019e72f2-514f-781d-91fd-50ed222b33c1" xlink:href="bip-20260630.xsd#bip_ServiceProviderAffiliateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_019e72f2-514f-7f36-a3dd-c958c6879c7c" xlink:to="loc_bip_ServiceProviderAffiliateMember_019e72f2-514f-781d-91fd-50ed222b33c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_SubsidiaryOfCommonParent1Member_019e72f2-6d36-7bc1-80ee-b8133921e6f7" xlink:href="bip-20260630.xsd#bip_SubsidiaryOfCommonParent1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_019e72f2-514f-7f36-a3dd-c958c6879c7c" xlink:to="loc_bip_SubsidiaryOfCommonParent1Member_019e72f2-6d36-7bc1-80ee-b8133921e6f7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ParentMember_019e72f2-84b8-73e5-a8b0-3fe4b829fa76" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CategoriesOfRelatedPartiesDomain_019e72f2-514f-7f36-a3dd-c958c6879c7c" xlink:to="loc_ifrs-full_ParentMember_019e72f2-84b8-73e5-a8b0-3fe4b829fa76" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameAxis_019e72f2-9fc3-7374-beab-c6fdec4d7e3a" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_019e72f1-f9f2-7c10-ba24-c0b2403e79d2" xlink:to="loc_ifrs-full_BorrowingsByNameAxis_019e72f2-9fc3-7374-beab-c6fdec4d7e3a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_019e72f2-9fc3-7374-beab-c6fdec4d7e3a_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_019e72f2-9fc3-7374-beab-c6fdec4d7e3a" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_019e72f2-9fc3-7374-beab-c6fdec4d7e3a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsByNameDomain_019e72f2-9fc3-75ff-9fd5-a382d642762d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsByNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_BorrowingsByNameAxis_019e72f2-9fc3-7374-beab-c6fdec4d7e3a" xlink:to="loc_ifrs-full_BorrowingsByNameDomain_019e72f2-9fc3-75ff-9fd5-a382d642762d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_RevolvingCreditFacilityWithBrookfieldMember_019e72f2-9fc3-7d30-83af-15859add4883" xlink:href="bip-20260630.xsd#bip_RevolvingCreditFacilityWithBrookfieldMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_BorrowingsByNameDomain_019e72f2-9fc3-75ff-9fd5-a382d642762d" xlink:to="loc_bip_RevolvingCreditFacilityWithBrookfieldMember_019e72f2-9fc3-7d30-83af-15859add4883" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CounterpartiesAxis_019e72f2-fa7c-74a0-9115-10984c3d03e7" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CounterpartiesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_019e72f1-f9f2-7c10-ba24-c0b2403e79d2" xlink:to="loc_ifrs-full_CounterpartiesAxis_019e72f2-fa7c-74a0-9115-10984c3d03e7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CounterpartiesDomain_019e72f2-fa7c-74a0-9115-10984c3d03e7_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CounterpartiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_CounterpartiesAxis_019e72f2-fa7c-74a0-9115-10984c3d03e7" xlink:to="loc_ifrs-full_CounterpartiesDomain_019e72f2-fa7c-74a0-9115-10984c3d03e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_CounterpartiesDomain_019e72f2-fa7c-7c43-bd44-3f27badce865" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_CounterpartiesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_CounterpartiesAxis_019e72f2-fa7c-74a0-9115-10984c3d03e7" xlink:to="loc_ifrs-full_CounterpartiesDomain_019e72f2-fa7c-7c43-bd44-3f27badce865" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_BrookfieldOfficePropertiesInc.Member_019e72f2-fa7c-7303-830a-4cc0408f98d4" xlink:href="bip-20260630.xsd#bip_BrookfieldOfficePropertiesInc.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_CounterpartiesDomain_019e72f2-fa7c-7c43-bd44-3f27badce865" xlink:to="loc_bip_BrookfieldOfficePropertiesInc.Member_019e72f2-fa7c-7303-830a-4cc0408f98d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesAxis_019e72f3-4968-71a6-aa17-cfd19b0f9f61" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_019e72f1-f9f2-7c10-ba24-c0b2403e79d2" xlink:to="loc_bip_AssociatesAndJointVenturesAxis_019e72f3-4968-71a6-aa17-cfd19b0f9f61" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesDomain_019e72f3-4968-71a6-aa17-cfd19b0f9f61_default" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_bip_AssociatesAndJointVenturesAxis_019e72f3-4968-71a6-aa17-cfd19b0f9f61" xlink:to="loc_bip_AssociatesAndJointVenturesDomain_019e72f3-4968-71a6-aa17-cfd19b0f9f61_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssociatesAndJointVenturesDomain_019e72f3-4968-7f89-bc17-5431434ba5a6" xlink:href="bip-20260630.xsd#bip_AssociatesAndJointVenturesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_bip_AssociatesAndJointVenturesAxis_019e72f3-4968-71a6-aa17-cfd19b0f9f61" xlink:to="loc_bip_AssociatesAndJointVenturesDomain_019e72f3-4968-7f89-bc17-5431434ba5a6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_EuropeanHyperscaleDataCenterMember_019e72f3-4968-7369-9836-3a16753170e8" xlink:href="bip-20260630.xsd#bip_EuropeanHyperscaleDataCenterMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e72f3-4968-7f89-bc17-5431434ba5a6" xlink:to="loc_bip_EuropeanHyperscaleDataCenterMember_019e72f3-4968-7369-9836-3a16753170e8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_GlobalIntermodalLogisticsOperationMember_019e72f3-86db-7591-a356-bd91bc006f25" xlink:href="bip-20260630.xsd#bip_GlobalIntermodalLogisticsOperationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e72f3-4968-7f89-bc17-5431434ba5a6" xlink:to="loc_bip_GlobalIntermodalLogisticsOperationMember_019e72f3-86db-7591-a356-bd91bc006f25" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_U.S.BulkFiberNetworkMember_019fb654-c37d-7b8d-9990-de74d9302477" xlink:href="bip-20260630.xsd#bip_U.S.BulkFiberNetworkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_bip_AssociatesAndJointVenturesDomain_019e72f3-4968-7f89-bc17-5431434ba5a6" xlink:to="loc_bip_U.S.BulkFiberNetworkMember_019fb654-c37d-7b8d-9990-de74d9302477" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesAxis_019fa301-27c2-7e72-8786-5f95eebdd547" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesTable_019e72f1-f9f2-7c10-ba24-c0b2403e79d2" xlink:to="loc_ifrs-full_TypesOfInterestRatesAxis_019fa301-27c2-7e72-8786-5f95eebdd547" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesDomain_019fa301-27c2-7e72-8786-5f95eebdd547_default" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis_019fa301-27c2-7e72-8786-5f95eebdd547" xlink:to="loc_ifrs-full_TypesOfInterestRatesDomain_019fa301-27c2-7e72-8786-5f95eebdd547_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_TypesOfInterestRatesDomain_019fa301-27c2-706f-a51b-0734823ed77d" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_TypesOfInterestRatesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_ifrs-full_TypesOfInterestRatesAxis_019fa301-27c2-7e72-8786-5f95eebdd547" xlink:to="loc_ifrs-full_TypesOfInterestRatesDomain_019fa301-27c2-706f-a51b-0734823ed77d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_FixedInterestRateMember_019fa301-27c2-756f-8028-ffed9b98dc80" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_FixedInterestRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_TypesOfInterestRatesDomain_019fa301-27c2-706f-a51b-0734823ed77d" xlink:to="loc_ifrs-full_FixedInterestRateMember_019fa301-27c2-756f-8028-ffed9b98dc80" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_019fb65d-4676-70fd-a88b-a15f01472782" 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_DisclosureOfTransactionsBetweenRelatedPartiesTable_019e72f1-f9f2-7c10-ba24-c0b2403e79d2" xlink:to="loc_dei_LegalEntityAxis_019fb65d-4676-70fd-a88b-a15f01472782" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019fb65d-4676-70fd-a88b-a15f01472782_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_019fb65d-4676-70fd-a88b-a15f01472782" xlink:to="loc_dei_EntityDomain_019fb65d-4676-70fd-a88b-a15f01472782_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_019fb65d-4676-7113-b010-61f41678970e" 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_019fb65d-4676-70fd-a88b-a15f01472782" xlink:to="loc_dei_EntityDomain_019fb65d-4676-7113-b010-61f41678970e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_ConsortiumMember_019fb65d-4676-74ca-b01a-7ef8fc28fbde" xlink:href="bip-20260630.xsd#bip_ConsortiumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_019fb65d-4676-7113-b010-61f41678970e" xlink:to="loc_bip_ConsortiumMember_019fb65d-4676-74ca-b01a-7ef8fc28fbde" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_DirectorsRemunerationExpense_019e72f1-f9f2-7d07-b893-1ab78fe10dbb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_DirectorsRemunerationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_DirectorsRemunerationExpense_019e72f1-f9f2-7d07-b893-1ab78fe10dbb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssetManagementFeePerQuarterPercent_019e72f2-514f-73cf-a74f-d4d5f5656805" xlink:href="bip-20260630.xsd#bip_AssetManagementFeePerQuarterPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_bip_AssetManagementFeePerQuarterPercent_019e72f2-514f-73cf-a74f-d4d5f5656805" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_AssetManagementFeePercent_019e72f2-514f-796e-b9bf-d17434efd788" xlink:href="bip-20260630.xsd#bip_AssetManagementFeePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_bip_AssetManagementFeePercent_019e72f2-514f-796e-b9bf-d17434efd788" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ServicesReceivedRelatedPartyTransactions_019e72f2-514f-760f-8e3a-4a579f940b3b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ServicesReceivedRelatedPartyTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_ServicesReceivedRelatedPartyTransactions_019e72f2-514f-760f-8e3a-4a579f940b3b" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_AmountsPayableRelatedPartyTransactions_019e72f2-514f-7c5e-8a49-224ecc1b23f8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_AmountsPayableRelatedPartyTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_AmountsPayableRelatedPartyTransactions_019e72f2-514f-7c5e-8a49-224ecc1b23f8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ShorttermDepositsClassifiedAsCashEquivalents_019e72f2-84b8-7dfe-b6f8-51282b02076f" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ShorttermDepositsClassifiedAsCashEquivalents"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_ShorttermDepositsClassifiedAsCashEquivalents_019e72f2-84b8-7dfe-b6f8-51282b02076f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_InterestExpenseRelatedPartyTransactions_019e72f2-84b8-77fb-8850-f9702533b524" xlink:href="bip-20260630.xsd#bip_InterestExpenseRelatedPartyTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_bip_InterestExpenseRelatedPartyTransactions_019e72f2-84b8-77fb-8850-f9702533b524" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_LineofCreditFacilityMaximumBorrowingCapacity1_019e72f2-9fc3-7b2d-9756-66f66d8b64ae" xlink:href="bip-20260630.xsd#bip_LineofCreditFacilityMaximumBorrowingCapacity1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_bip_LineofCreditFacilityMaximumBorrowingCapacity1_019e72f2-9fc3-7b2d-9756-66f66d8b64ae" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Borrowings_019e72f2-9fc3-7f2b-8cca-fd35dc398b58" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_Borrowings"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_Borrowings_019e72f2-9fc3-7f2b-8cca-fd35dc398b58" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_bip_CorporateBorrowingsRelatedPartyTransactions_019e72f2-b196-7149-95fe-fbcc84f0943c" xlink:href="bip-20260630.xsd#bip_CorporateBorrowingsRelatedPartyTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_bip_CorporateBorrowingsRelatedPartyTransactions_019e72f2-b196-7149-95fe-fbcc84f0943c" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RevenueFromSaleOfGoodsRelatedPartyTransactions_019e72f2-cad0-742e-9f87-f62a9e1e4ee6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RevenueFromSaleOfGoodsRelatedPartyTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_RevenueFromSaleOfGoodsRelatedPartyTransactions_019e72f2-cad0-742e-9f87-f62a9e1e4ee6" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_SettlementOfLiabilitiesOnBehalfOfEntityByRelatedPartyRelatedPartyTransactions_019e72f2-e66c-7bf7-8988-0be8a8db28b8" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_SettlementOfLiabilitiesOnBehalfOfEntityByRelatedPartyRelatedPartyTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_SettlementOfLiabilitiesOnBehalfOfEntityByRelatedPartyRelatedPartyTransactions_019e72f2-e66c-7bf7-8988-0be8a8db28b8" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_RightofuseAssets_019e72f2-fa7c-78ef-ab86-d1ff48115461" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_RightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_RightofuseAssets_019e72f2-fa7c-78ef-ab86-d1ff48115461" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProportionOfOwnershipInterestInAssociate_019e72f3-4968-7e17-a4e3-2869b134e57d" 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_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_ProportionOfOwnershipInterestInAssociate_019e72f3-4968-7e17-a4e3-2869b134e57d" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_ProceedsFromSalesOfInterestsInAssociates_019e72f3-4968-7eb2-b3df-efd0c033bd3c" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_ProceedsFromSalesOfInterestsInAssociates"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_ProceedsFromSalesOfInterestsInAssociates_019e72f3-4968-7eb2-b3df-efd0c033bd3c" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_BorrowingsInterestRate_019fa301-27c2-7c14-80e0-b511a2bb93eb" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_BorrowingsInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_BorrowingsInterestRate_019fa301-27c2-7c14-80e0-b511a2bb93eb" xlink:type="arc" order="15"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_GainsLossesRecognisedWhenControlInSubsidiaryIsLost_019e72f3-4968-7372-ad6c-f1a4d2bd4bfc" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_GainsLossesRecognisedWhenControlInSubsidiaryIsLost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_GainsLossesRecognisedWhenControlInSubsidiaryIsLost_019e72f3-4968-7372-ad6c-f1a4d2bd4bfc" xlink:type="arc" order="16"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets_019e72f3-b515-788d-a379-d19b827a6caf" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_PropertyPlantAndEquipmentIncludingRightofuseAssets_019e72f3-b515-788d-a379-d19b827a6caf" xlink:type="arc" order="17"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019e72f3-b515-7f08-b7a7-9d727f6a8fb6" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_IntangibleAssetsOtherThanGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_IntangibleAssetsOtherThanGoodwill_019e72f3-b515-7f08-b7a7-9d727f6a8fb6" xlink:type="arc" order="18"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_Goodwill_019e72f3-b515-71d9-b37c-97e596f8e43a" 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_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_Goodwill_019e72f3-b515-71d9-b37c-97e596f8e43a" xlink:type="arc" order="19"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_NetDebt_019e72f3-b515-7bab-b65e-f936cff6269b" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_NetDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_NetDebt_019e72f3-b515-7bab-b65e-f936cff6269b" xlink:type="arc" order="20"/>
    <link:loc xlink:type="locator" xlink:label="loc_ifrs-full_PurchasesOfPropertyAndOtherAssetsRelatedPartyTransactions_019fb78a-7b59-7e50-818c-b85085295b11" xlink:href="https://xbrl.ifrs.org/taxonomy/2025-03-27/full_ifrs/full_ifrs-cor_2025-03-27.xsd#ifrs-full_PurchasesOfPropertyAndOtherAssetsRelatedPartyTransactions"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_ifrs-full_DisclosureOfTransactionsBetweenRelatedPartiesLineItems_019e72f1-f9f2-7c32-b1c6-b8c3a219e4d5" xlink:to="loc_ifrs-full_PurchasesOfPropertyAndOtherAssetsRelatedPartyTransactions_019fb78a-7b59-7e50-818c-b85085295b11" xlink:type="arc" order="21"/>
  </link:definitionLink>
</link:linkbase>
