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

<!--XBRL Document Created with Wdesk from Workiva-->
<!--Copyright 2021 Workiva-->
<!--r:09573f37-1728-42bf-9c80-6c02fd3e47df,g:80061792-7849-49b1-a506-3ab8a3d66766-->
<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" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:roleRef roleURI="http://www.aon.com/role/Cover" xlink:type="simple" xlink:href="aon-20201231.xsd#Cover"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/Cover" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_dei_CoverAbstract_c49ea563-15f2-46f6-8239-a315f13a2ca6" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CoverAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitiesTable_11512d8a-002a-481b-bb06-b8bf6bb4974d" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntitiesTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_CoverAbstract_c49ea563-15f2-46f6-8239-a315f13a2ca6" xlink:to="loc_dei_EntitiesTable_11512d8a-002a-481b-bb06-b8bf6bb4974d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_fd2702b4-9992-4c26-9f88-45cec186786d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntitiesTable_11512d8a-002a-481b-bb06-b8bf6bb4974d" xlink:to="loc_us-gaap_StatementClassOfStockAxis_fd2702b4-9992-4c26-9f88-45cec186786d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_a674eaa4-8f8b-482b-8728-02af6a7074c1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ClassOfStockDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementClassOfStockAxis_fd2702b4-9992-4c26-9f88-45cec186786d" xlink:to="loc_us-gaap_ClassOfStockDomain_a674eaa4-8f8b-482b-8728-02af6a7074c1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonClassAMember_71394012-41b9-494a-9da5-a9acc1baa32f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonClassAMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockDomain_a674eaa4-8f8b-482b-8728-02af6a7074c1" xlink:to="loc_us-gaap_CommonClassAMember_71394012-41b9-494a-9da5-a9acc1baa32f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_GuaranteesOfAonPlcs4000SeniorNotesDue2023Member_fe2f081a-f89b-4b1c-b6f7-8c838ec4b20e" xlink:href="aon-20201231.xsd#aon_GuaranteesOfAonPlcs4000SeniorNotesDue2023Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockDomain_a674eaa4-8f8b-482b-8728-02af6a7074c1" xlink:to="loc_aon_GuaranteesOfAonPlcs4000SeniorNotesDue2023Member_fe2f081a-f89b-4b1c-b6f7-8c838ec4b20e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_GuaranteesOfAonPlcs3500SeniorNotesDue2024Member_d1e84be2-4363-4588-a958-80c92706012c" xlink:href="aon-20201231.xsd#aon_GuaranteesOfAonPlcs3500SeniorNotesDue2024Member"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockDomain_a674eaa4-8f8b-482b-8728-02af6a7074c1" xlink:to="loc_aon_GuaranteesOfAonPlcs3500SeniorNotesDue2024Member_d1e84be2-4363-4588-a958-80c92706012c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_GuaranteesOfAonPlcs3875SeniorNotesDue2025Member_6250fa64-507c-44c0-b284-89555b233997" xlink:href="aon-20201231.xsd#aon_GuaranteesOfAonPlcs3875SeniorNotesDue2025Member"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockDomain_a674eaa4-8f8b-482b-8728-02af6a7074c1" xlink:to="loc_aon_GuaranteesOfAonPlcs3875SeniorNotesDue2025Member_6250fa64-507c-44c0-b284-89555b233997" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_GuaranteesOfAonPlcs2875SeniorNotesDue2026Member_5b824060-149b-436c-83e8-7ea0d5a51dd5" xlink:href="aon-20201231.xsd#aon_GuaranteesOfAonPlcs2875SeniorNotesDue2026Member"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockDomain_a674eaa4-8f8b-482b-8728-02af6a7074c1" xlink:to="loc_aon_GuaranteesOfAonPlcs2875SeniorNotesDue2026Member_5b824060-149b-436c-83e8-7ea0d5a51dd5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_GuaranteesOfAonPlcs4250SeniorNotesDue2042Member_bb0cb20e-744f-4b52-8e99-a27690fd77b1" xlink:href="aon-20201231.xsd#aon_GuaranteesOfAonPlcs4250SeniorNotesDue2042Member"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockDomain_a674eaa4-8f8b-482b-8728-02af6a7074c1" xlink:to="loc_aon_GuaranteesOfAonPlcs4250SeniorNotesDue2042Member_bb0cb20e-744f-4b52-8e99-a27690fd77b1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_GuaranteesOfAonPlcs4450SeniorNotesDue2043Member_c37a4799-faee-4d43-a181-0400b80c6e07" xlink:href="aon-20201231.xsd#aon_GuaranteesOfAonPlcs4450SeniorNotesDue2043Member"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockDomain_a674eaa4-8f8b-482b-8728-02af6a7074c1" xlink:to="loc_aon_GuaranteesOfAonPlcs4450SeniorNotesDue2043Member_c37a4799-faee-4d43-a181-0400b80c6e07" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_GuaranteesOfAonPlcs4600SeniorNotesDue2044Member_eff1ab4d-45cc-4890-9731-174684ffd6c8" xlink:href="aon-20201231.xsd#aon_GuaranteesOfAonPlcs4600SeniorNotesDue2044Member"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockDomain_a674eaa4-8f8b-482b-8728-02af6a7074c1" xlink:to="loc_aon_GuaranteesOfAonPlcs4600SeniorNotesDue2044Member_eff1ab4d-45cc-4890-9731-174684ffd6c8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_GuaranteesOfAonPlcs4750SeniorNotesDue2045Member_51e100e1-ea92-4cc1-ba01-a1140bc8e99f" xlink:href="aon-20201231.xsd#aon_GuaranteesOfAonPlcs4750SeniorNotesDue2045Member"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ClassOfStockDomain_a674eaa4-8f8b-482b-8728-02af6a7074c1" xlink:to="loc_aon_GuaranteesOfAonPlcs4750SeniorNotesDue2045Member_51e100e1-ea92-4cc1-ba01-a1140bc8e99f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityInformationLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntitiesTable_11512d8a-002a-481b-bb06-b8bf6bb4974d" xlink:to="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentType_d5f288a0-261e-4873-af87-47dd690a149d" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentType"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_DocumentType_d5f288a0-261e-4873-af87-47dd690a149d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentAnnualReport_05b1dc99-7768-4d21-87a2-9e4a636dce2a" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentAnnualReport"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_DocumentAnnualReport_05b1dc99-7768-4d21-87a2-9e4a636dce2a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentPeriodEndDate_85b8af3d-e8f0-4ae8-93c8-6e76045a697d" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentPeriodEndDate"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_DocumentPeriodEndDate_85b8af3d-e8f0-4ae8-93c8-6e76045a697d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CurrentFiscalYearEndDate_bc80914d-ead1-4d71-a52d-6c93ea1ff3f5" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CurrentFiscalYearEndDate"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_CurrentFiscalYearEndDate_bc80914d-ead1-4d71-a52d-6c93ea1ff3f5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentTransitionReport_ae403524-7ae5-4475-b966-afb97451c119" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentTransitionReport"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_DocumentTransitionReport_ae403524-7ae5-4475-b966-afb97451c119" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFileNumber_0ffeea09-97d9-4f74-8108-ea18df0136af" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityFileNumber"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityFileNumber_0ffeea09-97d9-4f74-8108-ea18df0136af" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityRegistrantName_ad200308-f221-41a1-b595-b71ca491eba7" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityRegistrantName"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityRegistrantName_ad200308-f221-41a1-b595-b71ca491eba7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityIncorporationStateCountryCode_9f95f05d-f36c-4f8e-81e0-a07a409af9b3" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityIncorporationStateCountryCode"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityIncorporationStateCountryCode_9f95f05d-f36c-4f8e-81e0-a07a409af9b3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityTaxIdentificationNumber_1d2f7c1d-8a94-459a-9627-6ad78e67cfe5" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityTaxIdentificationNumber"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityTaxIdentificationNumber_1d2f7c1d-8a94-459a-9627-6ad78e67cfe5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressAddressLine1_ca9d80cb-cb1b-4639-9a4f-8b8b47b687e2" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressAddressLine1"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityAddressAddressLine1_ca9d80cb-cb1b-4639-9a4f-8b8b47b687e2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCityOrTown_8f797269-309c-4cc8-9f77-fdbe2805baac" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressCityOrTown"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityAddressCityOrTown_8f797269-309c-4cc8-9f77-fdbe2805baac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressCountry_448d9460-3cde-4184-a816-1caa2ba2cb5e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressCountry"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityAddressCountry_448d9460-3cde-4184-a816-1caa2ba2cb5e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityAddressPostalZipCode_0c100402-abeb-4f66-a9cf-3f78782bc0f8" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityAddressPostalZipCode"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityAddressPostalZipCode_0c100402-abeb-4f66-a9cf-3f78782bc0f8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_CityAreaCode_bde69185-43ad-4933-8f5f-9be07f5ed9a7" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_CityAreaCode"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_CityAreaCode_bde69185-43ad-4933-8f5f-9be07f5ed9a7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LocalPhoneNumber_6a467f68-4e8c-4181-a776-28396b2ba134" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_LocalPhoneNumber"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_LocalPhoneNumber_6a467f68-4e8c-4181-a776-28396b2ba134" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_Security12bTitle_4c3bc322-b58d-4f4b-83f2-e65fbf50bd17" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_Security12bTitle"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_Security12bTitle_4c3bc322-b58d-4f4b-83f2-e65fbf50bd17" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_TradingSymbol_c7e71878-e97e-4a05-8d88-ea5ab9ab1ebf" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_TradingSymbol"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_TradingSymbol_c7e71878-e97e-4a05-8d88-ea5ab9ab1ebf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_SecurityExchangeName_008fe6dd-ae98-44f4-8fe9-1cda2ab68138" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_SecurityExchangeName"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_SecurityExchangeName_008fe6dd-ae98-44f4-8fe9-1cda2ab68138" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityWellKnownSeasonedIssuer_badae305-9b37-48a7-b721-00be4fd5bb48" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityWellKnownSeasonedIssuer"/>
    <link:presentationArc order="19" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityWellKnownSeasonedIssuer_badae305-9b37-48a7-b721-00be4fd5bb48" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityVoluntaryFilers_e8a514af-dfd5-4c14-9e5a-1445c01cebf6" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityVoluntaryFilers"/>
    <link:presentationArc order="20" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityVoluntaryFilers_e8a514af-dfd5-4c14-9e5a-1445c01cebf6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCurrentReportingStatus_f1eb8d06-8586-476a-8d2e-65cdddab9fb3" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCurrentReportingStatus"/>
    <link:presentationArc order="21" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityCurrentReportingStatus_f1eb8d06-8586-476a-8d2e-65cdddab9fb3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityInteractiveDataCurrent_d2dd049a-b77b-45bd-bff2-772caefa89b2" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityInteractiveDataCurrent"/>
    <link:presentationArc order="22" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityInteractiveDataCurrent_d2dd049a-b77b-45bd-bff2-772caefa89b2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityFilerCategory_64a7e8fd-dee5-4a1f-b11c-5a8ddd83937a" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityFilerCategory"/>
    <link:presentationArc order="23" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityFilerCategory_64a7e8fd-dee5-4a1f-b11c-5a8ddd83937a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntitySmallBusiness_9739bbda-973b-4803-a3c5-036906918719" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntitySmallBusiness"/>
    <link:presentationArc order="24" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntitySmallBusiness_9739bbda-973b-4803-a3c5-036906918719" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityEmergingGrowthCompany_ee98d3ea-d96b-4f9c-bae9-da4f83ddb9e3" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityEmergingGrowthCompany"/>
    <link:presentationArc order="25" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityEmergingGrowthCompany_ee98d3ea-d96b-4f9c-bae9-da4f83ddb9e3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_IcfrAuditorAttestationFlag_c5c6eeba-b8d9-4cab-9ced-5e68369f1b5d" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_IcfrAuditorAttestationFlag"/>
    <link:presentationArc order="26" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_IcfrAuditorAttestationFlag_c5c6eeba-b8d9-4cab-9ced-5e68369f1b5d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityShellCompany_f0ab0524-9f3b-4922-bbbc-154c15a56f3e" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityShellCompany"/>
    <link:presentationArc order="27" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityShellCompany_f0ab0524-9f3b-4922-bbbc-154c15a56f3e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityPublicFloat_ef0967e8-4358-4999-aefd-3d6c8a5cbcae" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityPublicFloat"/>
    <link:presentationArc order="28" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityPublicFloat_ef0967e8-4358-4999-aefd-3d6c8a5cbcae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCommonStockSharesOutstanding_8706d2cc-b6b9-4991-9a4b-afd5a9a19e2c" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCommonStockSharesOutstanding"/>
    <link:presentationArc order="29" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityCommonStockSharesOutstanding_8706d2cc-b6b9-4991-9a4b-afd5a9a19e2c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentsIncorporatedByReferenceTextBlock_9d71bc9b-15b4-4ff7-92da-58343eeefdaf" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentsIncorporatedByReferenceTextBlock"/>
    <link:presentationArc order="30" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_DocumentsIncorporatedByReferenceTextBlock_9d71bc9b-15b4-4ff7-92da-58343eeefdaf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityCentralIndexKey_09577f64-b4be-4f70-93cb-6c376ef775a3" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_EntityCentralIndexKey"/>
    <link:presentationArc order="31" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_EntityCentralIndexKey_09577f64-b4be-4f70-93cb-6c376ef775a3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_AmendmentFlag_892418d3-69c8-4d9b-b631-fe8d5a01c3aa" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_AmendmentFlag"/>
    <link:presentationArc order="32" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_AmendmentFlag_892418d3-69c8-4d9b-b631-fe8d5a01c3aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalYearFocus_1d4b5d94-5335-4671-82f3-7bc24637ca8a" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentFiscalYearFocus"/>
    <link:presentationArc order="33" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_DocumentFiscalYearFocus_1d4b5d94-5335-4671-82f3-7bc24637ca8a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_DocumentFiscalPeriodFocus_3ba68406-a841-465d-b35a-9552fd1b90fe" xlink:href="https://xbrl.sec.gov/dei/2020/dei-2020-01-31.xsd#dei_DocumentFiscalPeriodFocus"/>
    <link:presentationArc order="34" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_dei_EntityInformationLineItems_9a8bcffd-0ce6-4ac4-a3d8-61da473c77a1" xlink:to="loc_dei_DocumentFiscalPeriodFocus_3ba68406-a841-465d-b35a-9552fd1b90fe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ConsolidatedStatementsofIncome" xlink:type="simple" xlink:href="aon-20201231.xsd#ConsolidatedStatementsofIncome"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ConsolidatedStatementsofIncome" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesAbstract_ed6bbf46-beb0-4a7b-8b17-f897880d52b8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenuesAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_RevenuesAbstract_ed6bbf46-beb0-4a7b-8b17-f897880d52b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_e8c500f6-0987-4513-ad49-502adcba7e8c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenuesAbstract_ed6bbf46-beb0-4a7b-8b17-f897880d52b8" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_e8c500f6-0987-4513-ad49-502adcba7e8c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpensesAbstract_b5177de2-c3f0-4b63-ba08-ffc94313adfd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostsAndExpensesAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_CostsAndExpensesAbstract_b5177de2-c3f0-4b63-ba08-ffc94313adfd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LaborAndRelatedExpense_91ea90de-6a60-4d23-b56f-ec7c4b192ce3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LaborAndRelatedExpense"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_b5177de2-c3f0-4b63-ba08-ffc94313adfd" xlink:to="loc_us-gaap_LaborAndRelatedExpense_91ea90de-6a60-4d23-b56f-ec7c4b192ce3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InformationTechnologyAndDataProcessing_f444d7c2-ba3c-44e5-9633-2f656c213877" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InformationTechnologyAndDataProcessing"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_b5177de2-c3f0-4b63-ba08-ffc94313adfd" xlink:to="loc_us-gaap_InformationTechnologyAndDataProcessing_f444d7c2-ba3c-44e5-9633-2f656c213877" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OccupancyNet_0fbb6652-f666-46b8-bb99-3b1f3b30cff0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OccupancyNet"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_b5177de2-c3f0-4b63-ba08-ffc94313adfd" xlink:to="loc_us-gaap_OccupancyNet_0fbb6652-f666-46b8-bb99-3b1f3b30cff0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_a38ba2c3-94ef-4626-8c24-19ad955e676c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Depreciation"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_b5177de2-c3f0-4b63-ba08-ffc94313adfd" xlink:to="loc_us-gaap_Depreciation_a38ba2c3-94ef-4626-8c24-19ad955e676c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_AmortizationAndImpairmentOfIntangibleAssets_a97cb05d-e590-4ff7-8f68-aa59cbe649cc" xlink:href="aon-20201231.xsd#aon_AmortizationAndImpairmentOfIntangibleAssets"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_b5177de2-c3f0-4b63-ba08-ffc94313adfd" xlink:to="loc_aon_AmortizationAndImpairmentOfIntangibleAssets_a97cb05d-e590-4ff7-8f68-aa59cbe649cc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherGeneralExpenses_20f8b256-7672-41b7-ac93-c971cea05d5d" xlink:href="aon-20201231.xsd#aon_OtherGeneralExpenses"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_b5177de2-c3f0-4b63-ba08-ffc94313adfd" xlink:to="loc_aon_OtherGeneralExpenses_20f8b256-7672-41b7-ac93-c971cea05d5d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostsAndExpenses_2959d076-bd42-44b7-945c-00cb8774906f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CostsAndExpenses"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CostsAndExpensesAbstract_b5177de2-c3f0-4b63-ba08-ffc94313adfd" xlink:to="loc_us-gaap_CostsAndExpenses_2959d076-bd42-44b7-945c-00cb8774906f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingIncomeLoss_5cf317af-412f-4e7d-89f5-0568b50ff52d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingIncomeLoss"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_OperatingIncomeLoss_5cf317af-412f-4e7d-89f5-0568b50ff52d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InvestmentIncomeInterestAndDividend_4de476da-ff01-48d2-abea-ba65ecfc9064" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InvestmentIncomeInterestAndDividend"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_InvestmentIncomeInterestAndDividend_4de476da-ff01-48d2-abea-ba65ecfc9064" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpense_4cde99b7-84f5-4ac9-a34b-051672604372" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpense"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_InterestExpense_4cde99b7-84f5-4ac9-a34b-051672604372" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNonoperatingIncomeExpense_ee439c71-6e55-4a77-96ea-2a3f8f477527" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNonoperatingIncomeExpense"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_OtherNonoperatingIncomeExpense_ee439c71-6e55-4a77-96ea-2a3f8f477527" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0447ed68-203a-496f-80ad-fe9e693a29b2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_0447ed68-203a-496f-80ad-fe9e693a29b2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_e30bb620-2ea5-4fba-b519-cf028a32207e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_e30bb620-2ea5-4fba-b519-cf028a32207e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_543522a4-b5c5-4fb3-ab35-7cbe5b1b6717" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest_543522a4-b5c5-4fb3-ab35-7cbe5b1b6717" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_e79f7717-85b4-4f4d-932f-a12ecbeacfb1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_e79f7717-85b4-4f4d-932f-a12ecbeacfb1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_df0a5535-9737-4ba9-9900-8a2d19c9de92" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_ProfitLoss_df0a5535-9737-4ba9-9900-8a2d19c9de92" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_e38bc614-026a-4bf2-8c6d-6bd0626c8cf1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_e38bc614-026a-4bf2-8c6d-6bd0626c8cf1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_2d9128ee-f3e6-41ef-aea1-bbbbc4d4d123" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_2d9128ee-f3e6-41ef-aea1-bbbbc4d4d123" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasicAbstract_503d2b98-171f-4488-a01c-50c0a3846d4d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareBasicAbstract"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_EarningsPerShareBasicAbstract_503d2b98-171f-4488-a01c-50c0a3846d4d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_8e014918-61e5-4827-be2f-d9e545554821" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerBasicShare"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_503d2b98-171f-4488-a01c-50c0a3846d4d" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerBasicShare_8e014918-61e5-4827-be2f-d9e545554821" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_f0a15988-fc63-4436-85ca-7e19d009d6f7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_503d2b98-171f-4488-a01c-50c0a3846d4d" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare_f0a15988-fc63-4436-85ca-7e19d009d6f7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareBasic_1bdd7caf-79cf-4c70-96d5-45e691f10bfa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareBasic"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareBasicAbstract_503d2b98-171f-4488-a01c-50c0a3846d4d" xlink:to="loc_us-gaap_EarningsPerShareBasic_1bdd7caf-79cf-4c70-96d5-45e691f10bfa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDilutedAbstract_8687710c-dc09-4341-93c0-eb113a26690c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareDilutedAbstract"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_EarningsPerShareDilutedAbstract_8687710c-dc09-4341-93c0-eb113a26690c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_1ecad080-2220-48bb-b114-8898ee11ddbd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_8687710c-dc09-4341-93c0-eb113a26690c" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare_1ecad080-2220-48bb-b114-8898ee11ddbd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_474d88dc-9abe-4e3d-bbad-610dc4cef010" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_8687710c-dc09-4341-93c0-eb113a26690c" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare_474d88dc-9abe-4e3d-bbad-610dc4cef010" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerShareDiluted_57088164-0db6-46d8-ac18-39e509a885ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerShareDiluted"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EarningsPerShareDilutedAbstract_8687710c-dc09-4341-93c0-eb113a26690c" xlink:to="loc_us-gaap_EarningsPerShareDiluted_57088164-0db6-46d8-ac18-39e509a885ae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_ba5a4684-2a9b-4aa6-afff-b2ce4b3b944a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_ba5a4684-2a9b-4aa6-afff-b2ce4b3b944a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_a38721e6-3e8d-4173-9635-a3dbc2363c58" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementAbstract_f428dadf-7105-4f20-a047-9f0d5a6babfb" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_a38721e6-3e8d-4173-9635-a3dbc2363c58" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ConsolidatedStatementsofComprehensiveIncome" xlink:type="simple" xlink:href="aon-20201231.xsd#ConsolidatedStatementsofComprehensiveIncome"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ConsolidatedStatementsofComprehensiveIncome" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_1fa676a6-9fa9-4ea5-862d-829c1ee0f81a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_909a697a-10e5-4d68-a7bb-62c4d1b4c68d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_1fa676a6-9fa9-4ea5-862d-829c1ee0f81a" xlink:to="loc_us-gaap_ProfitLoss_909a697a-10e5-4d68-a7bb-62c4d1b4c68d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_2f5281e9-c16d-4d4c-8fb4-f06369fb6fb2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLossAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_1fa676a6-9fa9-4ea5-862d-829c1ee0f81a" xlink:to="loc_us-gaap_NetIncomeLossAttributableToNoncontrollingInterest_2f5281e9-c16d-4d4c-8fb4-f06369fb6fb2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_7452efd5-51ca-4a70-abc8-4c7f31e5361a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_1fa676a6-9fa9-4ea5-862d-829c1ee0f81a" xlink:to="loc_us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic_7452efd5-51ca-4a70-abc8-4c7f31e5361a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_651e6b5a-96de-4513-aa95-3f9b3bd852f1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_1fa676a6-9fa9-4ea5-862d-829c1ee0f81a" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_651e6b5a-96de-4513-aa95-3f9b3bd852f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_dd9905b4-11df-4be0-a8f0-40a6b597fc8e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_651e6b5a-96de-4513-aa95-3f9b3bd852f1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_dd9905b4-11df-4be0-a8f0-40a6b597fc8e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_279c7cf8-9851-420d-ae2f-e292a050a3fb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_651e6b5a-96de-4513-aa95-3f9b3bd852f1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_279c7cf8-9851-420d-ae2f-e292a050a3fb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_1d554b23-1f98-448d-a32d-7fa1382b4906" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_651e6b5a-96de-4513-aa95-3f9b3bd852f1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_1d554b23-1f98-448d-a32d-7fa1382b4906" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2d381a3d-291f-4d6a-82e5-e455eb52529a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTax"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPeriodIncreaseDecreaseAbstract_651e6b5a-96de-4513-aa95-3f9b3bd852f1" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTax_2d381a3d-291f-4d6a-82e5-e455eb52529a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_8fcb72af-9241-4cab-9028-e62439dafc73" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_1fa676a6-9fa9-4ea5-862d-829c1ee0f81a" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToNoncontrollingInterest_8fcb72af-9241-4cab-9028-e62439dafc73" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_9a177bdb-1a78-4921-b6c0-9bc0e1ca4b86" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_1fa676a6-9fa9-4ea5-862d-829c1ee0f81a" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_9a177bdb-1a78-4921-b6c0-9bc0e1ca4b86" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComprehensiveIncomeNetOfTax_ad3804ba-b172-4a53-9ccd-f3320645288f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComprehensiveIncomeNetOfTax"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfIncomeAndComprehensiveIncomeAbstract_1fa676a6-9fa9-4ea5-862d-829c1ee0f81a" xlink:to="loc_us-gaap_ComprehensiveIncomeNetOfTax_ad3804ba-b172-4a53-9ccd-f3320645288f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ConsolidatedStatementsofFinancialPosition" xlink:type="simple" xlink:href="aon-20201231.xsd#ConsolidatedStatementsofFinancialPosition"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ConsolidatedStatementsofFinancialPosition" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_db5cea2b-88f8-4aba-9842-0532db41737d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_2647b003-6090-4959-8bae-9d4dafb674c9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_db5cea2b-88f8-4aba-9842-0532db41737d" xlink:to="loc_us-gaap_AssetsAbstract_2647b003-6090-4959-8bae-9d4dafb674c9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_89af803d-3f9b-4ec2-b31e-df0456b7b31c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_2647b003-6090-4959-8bae-9d4dafb674c9" xlink:to="loc_us-gaap_AssetsCurrentAbstract_89af803d-3f9b-4ec2-b31e-df0456b7b31c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_7af714ce-2b02-4ee9-ae9e-d275bad7301c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_89af803d-3f9b-4ec2-b31e-df0456b7b31c" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_7af714ce-2b02-4ee9-ae9e-d275bad7301c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermInvestments_541be7f0-cc58-4b1b-911b-ae9a8da5d3cc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermInvestments"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_89af803d-3f9b-4ec2-b31e-df0456b7b31c" xlink:to="loc_us-gaap_ShortTermInvestments_541be7f0-cc58-4b1b-911b-ae9a8da5d3cc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_0079301b-fac4-4cff-85b2-bcb6e45dc57d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_89af803d-3f9b-4ec2-b31e-df0456b7b31c" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_0079301b-fac4-4cff-85b2-bcb6e45dc57d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FiduciaryAssets_bd380fd2-51c5-4a65-96d3-47e6a5a69231" xlink:href="aon-20201231.xsd#aon_FiduciaryAssets"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_89af803d-3f9b-4ec2-b31e-df0456b7b31c" xlink:to="loc_aon_FiduciaryAssets_bd380fd2-51c5-4a65-96d3-47e6a5a69231" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_70880aa5-7a64-4134-bd01-5f2331decef9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_89af803d-3f9b-4ec2-b31e-df0456b7b31c" xlink:to="loc_us-gaap_OtherAssetsCurrent_70880aa5-7a64-4134-bd01-5f2331decef9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_6796a8b4-5517-4158-bfd8-136ad619745d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsCurrent"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsCurrentAbstract_89af803d-3f9b-4ec2-b31e-df0456b7b31c" xlink:to="loc_us-gaap_AssetsCurrent_6796a8b4-5517-4158-bfd8-136ad619745d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_e6d9dc6d-412d-4e20-8b85-d76ad77445ad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_2647b003-6090-4959-8bae-9d4dafb674c9" xlink:to="loc_us-gaap_Goodwill_e6d9dc6d-412d-4e20-8b85-d76ad77445ad" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_d4ac6c7e-6efc-4845-ac4d-62702a0140c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_2647b003-6090-4959-8bae-9d4dafb674c9" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_d4ac6c7e-6efc-4845-ac4d-62702a0140c4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_89b823ef-1ea6-4674-95a6-54b66d6c613f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_2647b003-6090-4959-8bae-9d4dafb674c9" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_89b823ef-1ea6-4674-95a6-54b66d6c613f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_3c3913d5-7110-49a3-967b-c0a56d3a32f5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_2647b003-6090-4959-8bae-9d4dafb674c9" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_3c3913d5-7110-49a3-967b-c0a56d3a32f5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_4a6445b8-75eb-4f3d-a9c9-4c9207e7e644" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_2647b003-6090-4959-8bae-9d4dafb674c9" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_4a6445b8-75eb-4f3d-a9c9-4c9207e7e644" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_990cde99-91bf-4b75-ae15-052d547acc65" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_2647b003-6090-4959-8bae-9d4dafb674c9" xlink:to="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_990cde99-91bf-4b75-ae15-052d547acc65" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_fc21d4db-6c79-4b3f-b097-872022a25484" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_2647b003-6090-4959-8bae-9d4dafb674c9" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_fc21d4db-6c79-4b3f-b097-872022a25484" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_14dfdc73-4dac-4bba-b844-0dba5d827612" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Assets"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_2647b003-6090-4959-8bae-9d4dafb674c9" xlink:to="loc_us-gaap_Assets_14dfdc73-4dac-4bba-b844-0dba5d827612" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_319c252f-f369-487a-b27b-48d2c876fdf8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_db5cea2b-88f8-4aba-9842-0532db41737d" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_319c252f-f369-487a-b27b-48d2c876fdf8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_aaff83fb-f6d4-4ad0-a40b-df722145094c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_319c252f-f369-487a-b27b-48d2c876fdf8" xlink:to="loc_us-gaap_LiabilitiesAbstract_aaff83fb-f6d4-4ad0-a40b-df722145094c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract_1e96df82-16c9-4566-882e-efedf99d599d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_aaff83fb-f6d4-4ad0-a40b-df722145094c" xlink:to="loc_us-gaap_LiabilitiesCurrentAbstract_1e96df82-16c9-4566-882e-efedf99d599d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_91f7654a-458c-4856-941f-1b9a6c43ec12" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_1e96df82-16c9-4566-882e-efedf99d599d" xlink:to="loc_us-gaap_AccountsPayableAndAccruedLiabilitiesCurrent_91f7654a-458c-4856-941f-1b9a6c43ec12" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_4580f7b9-7252-4ad6-93bf-4c3dc74c22b9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtCurrent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_1e96df82-16c9-4566-882e-efedf99d599d" xlink:to="loc_us-gaap_DebtCurrent_4580f7b9-7252-4ad6-93bf-4c3dc74c22b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FiduciaryLiabilities_b8b70da5-82a1-41eb-a09d-a25cad1edd5a" xlink:href="aon-20201231.xsd#aon_FiduciaryLiabilities"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_1e96df82-16c9-4566-882e-efedf99d599d" xlink:to="loc_aon_FiduciaryLiabilities_b8b70da5-82a1-41eb-a09d-a25cad1edd5a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_9e5240e5-21c6-4e8a-8d41-bcecde447bf4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_1e96df82-16c9-4566-882e-efedf99d599d" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_9e5240e5-21c6-4e8a-8d41-bcecde447bf4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_e94a0051-30ca-49a5-a3f5-b24cd0816c73" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract_1e96df82-16c9-4566-882e-efedf99d599d" xlink:to="loc_us-gaap_LiabilitiesCurrent_e94a0051-30ca-49a5-a3f5-b24cd0816c73" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_766cd7c8-0fd5-4392-a366-f3ecba3fc8f1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_aaff83fb-f6d4-4ad0-a40b-df722145094c" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_766cd7c8-0fd5-4392-a366-f3ecba3fc8f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_d66e7262-4a0e-4bf7-b2ff-33a4f5f3d000" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_aaff83fb-f6d4-4ad0-a40b-df722145094c" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_d66e7262-4a0e-4bf7-b2ff-33a4f5f3d000" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_6cd0b9db-d0bb-4a98-82b2-5e24ee37df4b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_aaff83fb-f6d4-4ad0-a40b-df722145094c" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_6cd0b9db-d0bb-4a98-82b2-5e24ee37df4b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent_19ff4495-9729-488c-98db-318a33f03c98" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_aaff83fb-f6d4-4ad0-a40b-df722145094c" xlink:to="loc_us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent_19ff4495-9729-488c-98db-318a33f03c98" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_3fd10b94-b680-43e5-8fb4-8c7b6be364ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_aaff83fb-f6d4-4ad0-a40b-df722145094c" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_3fd10b94-b680-43e5-8fb4-8c7b6be364ae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_d1992469-e87c-425d-b346-951dee596586" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Liabilities"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_aaff83fb-f6d4-4ad0-a40b-df722145094c" xlink:to="loc_us-gaap_Liabilities_d1992469-e87c-425d-b346-951dee596586" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_fc9a13e9-58ef-4b06-a7cc-60c24051061e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_319c252f-f369-487a-b27b-48d2c876fdf8" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_fc9a13e9-58ef-4b06-a7cc-60c24051061e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockValue_ca55c66c-dcb4-4578-b4c0-7895de8c0085" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_fc9a13e9-58ef-4b06-a7cc-60c24051061e" xlink:to="loc_us-gaap_CommonStockValue_ca55c66c-dcb4-4578-b4c0-7895de8c0085" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalCommonStock_905b9406-9e0d-4b24-93e0-e23af0cd8e35" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalPaidInCapitalCommonStock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_fc9a13e9-58ef-4b06-a7cc-60c24051061e" xlink:to="loc_us-gaap_AdditionalPaidInCapitalCommonStock_905b9406-9e0d-4b24-93e0-e23af0cd8e35" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_20d01832-efce-47fb-8780-1cb6ea54e49f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_fc9a13e9-58ef-4b06-a7cc-60c24051061e" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_20d01832-efce-47fb-8780-1cb6ea54e49f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_ffaa5c99-8fb8-495a-b856-16721a06dbdb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_fc9a13e9-58ef-4b06-a7cc-60c24051061e" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_ffaa5c99-8fb8-495a-b856-16721a06dbdb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_a8eefca4-39d9-4440-a640-0d1c0f89ab9f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquity"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_fc9a13e9-58ef-4b06-a7cc-60c24051061e" xlink:to="loc_us-gaap_StockholdersEquity_a8eefca4-39d9-4440-a640-0d1c0f89ab9f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterest_33d2a569-4d91-4725-b3b9-334f0995d6e6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MinorityInterest"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_fc9a13e9-58ef-4b06-a7cc-60c24051061e" xlink:to="loc_us-gaap_MinorityInterest_33d2a569-4d91-4725-b3b9-334f0995d6e6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_9f87f133-fa7b-4bd5-8fe2-ba8db26c8150" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAbstract_fc9a13e9-58ef-4b06-a7cc-60c24051061e" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_9f87f133-fa7b-4bd5-8fe2-ba8db26c8150" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_f31dc46d-d148-4e89-b970-8d0637b7566a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_319c252f-f369-487a-b27b-48d2c876fdf8" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_f31dc46d-d148-4e89-b970-8d0637b7566a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ConsolidatedStatementsofFinancialPositionParenthetical" xlink:type="simple" xlink:href="aon-20201231.xsd#ConsolidatedStatementsofFinancialPositionParenthetical"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ConsolidatedStatementsofFinancialPositionParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfFinancialPositionAbstract_9cb1ec00-bd3e-44f8-a5ff-54137dd0780b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementOfFinancialPositionAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockParOrStatedValuePerShare_0d71a9af-4d5d-477f-b5d5-0a28bac6e037" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockParOrStatedValuePerShare"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_9cb1ec00-bd3e-44f8-a5ff-54137dd0780b" xlink:to="loc_us-gaap_CommonStockParOrStatedValuePerShare_0d71a9af-4d5d-477f-b5d5-0a28bac6e037" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesAuthorized_3c140b9b-746a-4216-8df4-b20c306d267f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesAuthorized"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_9cb1ec00-bd3e-44f8-a5ff-54137dd0780b" xlink:to="loc_us-gaap_CommonStockSharesAuthorized_3c140b9b-746a-4216-8df4-b20c306d267f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_137f7318-5dd6-4055-ba2a-aa59f5b11bf4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfFinancialPositionAbstract_9cb1ec00-bd3e-44f8-a5ff-54137dd0780b" xlink:to="loc_us-gaap_CommonStockSharesIssued_137f7318-5dd6-4055-ba2a-aa59f5b11bf4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ConsolidatedStatementsofShareholdersEquity" xlink:type="simple" xlink:href="aon-20201231.xsd#ConsolidatedStatementsofShareholdersEquity"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ConsolidatedStatementsofShareholdersEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfStockholdersEquityAbstract_4d23d081-74c4-4517-a9e0-9340eabfa1ff" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_236989e7-8e96-488f-9324-2aae7de6868d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfStockholdersEquityAbstract_4d23d081-74c4-4517-a9e0-9340eabfa1ff" xlink:to="loc_us-gaap_StatementTable_236989e7-8e96-488f-9324-2aae7de6868d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_2b2d8488-4ae4-4adc-b586-8d27f1da3e5a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_236989e7-8e96-488f-9324-2aae7de6868d" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_2b2d8488-4ae4-4adc-b586-8d27f1da3e5a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_05c29e31-016e-4286-8872-aac9827b5c4e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_2b2d8488-4ae4-4adc-b586-8d27f1da3e5a" xlink:to="loc_us-gaap_EquityComponentDomain_05c29e31-016e-4286-8872-aac9827b5c4e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember_b1ee73f6-c9c6-410f-90c6-118649b3f071" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_05c29e31-016e-4286-8872-aac9827b5c4e" xlink:to="loc_us-gaap_CommonStockIncludingAdditionalPaidInCapitalMember_b1ee73f6-c9c6-410f-90c6-118649b3f071" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_697aa0d2-8bf0-43e8-9e5c-db5945c769c8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_05c29e31-016e-4286-8872-aac9827b5c4e" xlink:to="loc_us-gaap_RetainedEarningsMember_697aa0d2-8bf0-43e8-9e5c-db5945c769c8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_44586e15-89d1-4564-9b84-e4456e5420ef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_05c29e31-016e-4286-8872-aac9827b5c4e" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_44586e15-89d1-4564-9b84-e4456e5420ef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncontrollingInterestMember_fe447e8a-2fb2-4502-a298-807264637232" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NoncontrollingInterestMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_05c29e31-016e-4286-8872-aac9827b5c4e" xlink:to="loc_us-gaap_NoncontrollingInterestMember_fe447e8a-2fb2-4502-a298-807264637232" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_5a77b827-9f8b-49d6-8000-f28d7d06a37e" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_236989e7-8e96-488f-9324-2aae7de6868d" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_5a77b827-9f8b-49d6-8000-f28d7d06a37e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_0507512d-eabe-477b-9bbd-e07b5f5bc5d8" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_5a77b827-9f8b-49d6-8000-f28d7d06a37e" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_0507512d-eabe-477b-9bbd-e07b5f5bc5d8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_b584a7b2-a6ae-4356-9351-ab5b9f7b38b9" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_0507512d-eabe-477b-9bbd-e07b5f5bc5d8" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_b584a7b2-a6ae-4356-9351-ab5b9f7b38b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember_74bc9413-9aaf-458f-b4e6-626cd77ba419" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_0507512d-eabe-477b-9bbd-e07b5f5bc5d8" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember_74bc9413-9aaf-458f-b4e6-626cd77ba419" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_86551ef5-1107-4d6f-8319-4c1859fce79a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementTable_236989e7-8e96-488f-9324-2aae7de6868d" xlink:to="loc_us-gaap_StatementLineItems_86551ef5-1107-4d6f-8319-4c1859fce79a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementLineItems_86551ef5-1107-4d6f-8319-4c1859fce79a" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_7b0c4c38-60ae-4eb9-992c-51d77aba5f37" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_CommonStockSharesIssued_7b0c4c38-60ae-4eb9-992c-51d77aba5f37" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_911133ca-a746-4099-85d2-ad3451a564a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_911133ca-a746-4099-85d2-ad3451a564a9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_c3735a33-75a2-40b3-b484-e0af11060425" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_ProfitLoss_c3735a33-75a2-40b3-b484-e0af11060425" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_57a79e66-ccea-4d15-a4c7-fe45036a938b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_57a79e66-ccea-4d15-a4c7-fe45036a938b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_665a1849-ca19-495a-b62a-1b286e8e0067" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation_665a1849-ca19-495a-b62a-1b286e8e0067" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodShares_80a1b413-d748-4fff-a7d2-b1b2f4b5769a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodShares"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodShares_80a1b413-d748-4fff-a7d2-b1b2f4b5769a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchasedDuringPeriodValue_ad108dd6-351b-4e44-8904-37ac78d53cf4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockRepurchasedDuringPeriodValue"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_StockRepurchasedDuringPeriodValue_ad108dd6-351b-4e44-8904-37ac78d53cf4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_dc02aa73-e419-4b23-b641-311a4ab8e03f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_dc02aa73-e419-4b23-b641-311a4ab8e03f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DividendsCommonStockCash_b428d3b0-cec7-4935-89fe-8f3c27f87402" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DividendsCommonStockCash"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_DividendsCommonStockCash_b428d3b0-cec7-4935-89fe-8f3c27f87402" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_4bf0f2f6-0d4f-474b-9899-351a9bf6f44d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax_4bf0f2f6-0d4f-474b-9899-351a9bf6f44d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_58932066-a8b3-47aa-9e81-4ab7239a9757" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax_58932066-a8b3-47aa-9e81-4ab7239a9757" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_3cd579ba-81f9-433c-a392-b98cafa64766" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_3cd579ba-81f9-433c-a392-b98cafa64766" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_8cf6c79f-94d1-4f58-9395-14e6c2f2b71c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MinorityInterestDecreaseFromRedemptions"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromRedemptions_8cf6c79f-94d1-4f58-9395-14e6c2f2b71c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_27b05c60-bf79-40c1-8e0c-55f2662c7cff" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders_27b05c60-bf79-40c1-8e0c-55f2662c7cff" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesIssued_9b11ec93-ceac-41bc-9ee0-27346694f031" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockSharesIssued"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_CommonStockSharesIssued_9b11ec93-ceac-41bc-9ee0-27346694f031" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2fa9201e-8434-479f-b0f5-96971f954e53" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_5a3757dd-2450-4ba3-a0ff-484c98396d41" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_2fa9201e-8434-479f-b0f5-96971f954e53" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ConsolidatedStatementsofShareholdersEquityParenthetical" xlink:type="simple" xlink:href="aon-20201231.xsd#ConsolidatedStatementsofShareholdersEquityParenthetical"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ConsolidatedStatementsofShareholdersEquityParenthetical" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfStockholdersEquityAbstract_8c2be4ca-cd72-4778-ac31-bbc754adcc9d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementOfStockholdersEquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockDividendsPerShareDeclared_e94d6fa4-c282-4100-842f-a3789989d4d6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommonStockDividendsPerShareDeclared"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfStockholdersEquityAbstract_8c2be4ca-cd72-4778-ac31-bbc754adcc9d" xlink:to="loc_us-gaap_CommonStockDividendsPerShareDeclared_e94d6fa4-c282-4100-842f-a3789989d4d6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ConsolidatedStatementsofCashFlows" xlink:type="simple" xlink:href="aon-20201231.xsd#ConsolidatedStatementsofCashFlows"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ConsolidatedStatementsofCashFlows" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementOfCashFlowsAbstract_d6e39aa3-8a98-4896-9720-d1b7a5ede7f4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementOfCashFlowsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_6ae57156-d24f-43ad-af9d-5ef71801bc13" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_d6e39aa3-8a98-4896-9720-d1b7a5ede7f4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_6ae57156-d24f-43ad-af9d-5ef71801bc13" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProfitLoss_9c23ca4e-8673-418d-aebf-218fb072df70" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProfitLoss"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_6ae57156-d24f-43ad-af9d-5ef71801bc13" xlink:to="loc_us-gaap_ProfitLoss_9c23ca4e-8673-418d-aebf-218fb072df70" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_cfa1a0f3-6e41-457a-bd79-5a487a2a95d6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_6ae57156-d24f-43ad-af9d-5ef71801bc13" xlink:to="loc_us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax_cfa1a0f3-6e41-457a-bd79-5a487a2a95d6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_a36b2d05-82bc-4158-bb3a-74956a68e69d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_6ae57156-d24f-43ad-af9d-5ef71801bc13" xlink:to="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_a36b2d05-82bc-4158-bb3a-74956a68e69d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_GainLossOnSaleofBusinessAndInvestmentsNet_3bd25bd9-ad84-4ba2-a0f3-463d3b1df71f" xlink:href="aon-20201231.xsd#aon_GainLossOnSaleofBusinessAndInvestmentsNet"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_a36b2d05-82bc-4158-bb3a-74956a68e69d" xlink:to="loc_aon_GainLossOnSaleofBusinessAndInvestmentsNet_3bd25bd9-ad84-4ba2-a0f3-463d3b1df71f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_aa4a8cb6-95f3-4876-a46e-660543208dae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Depreciation"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_a36b2d05-82bc-4158-bb3a-74956a68e69d" xlink:to="loc_us-gaap_Depreciation_aa4a8cb6-95f3-4876-a46e-660543208dae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentForAmortization_f7c30f82-8d32-471f-9860-0f24e8be5a76" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdjustmentForAmortization"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_a36b2d05-82bc-4158-bb3a-74956a68e69d" xlink:to="loc_us-gaap_AdjustmentForAmortization_f7c30f82-8d32-471f-9860-0f24e8be5a76" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_43f9cf7e-811c-4390-91a6-52462e20e770" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensation"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_a36b2d05-82bc-4158-bb3a-74956a68e69d" xlink:to="loc_us-gaap_ShareBasedCompensation_43f9cf7e-811c-4390-91a6-52462e20e770" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_6790d747-ca45-483c-bd80-b3538cac0300" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxesAndTaxCredits"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivitiesAbstract_a36b2d05-82bc-4158-bb3a-74956a68e69d" xlink:to="loc_us-gaap_DeferredIncomeTaxesAndTaxCredits_6790d747-ca45-483c-bd80-b3538cac0300" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_30c90e7d-0ba3-497b-8857-c43125100a82" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOperatingCapitalAbstract"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_6ae57156-d24f-43ad-af9d-5ef71801bc13" xlink:to="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_30c90e7d-0ba3-497b-8857-c43125100a82" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_IncreaseDecreaseInFiduciaryReceivables_3e1809f9-e40b-4ab8-8daa-b557e3e2d373" xlink:href="aon-20201231.xsd#aon_IncreaseDecreaseInFiduciaryReceivables"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_30c90e7d-0ba3-497b-8857-c43125100a82" xlink:to="loc_aon_IncreaseDecreaseInFiduciaryReceivables_3e1809f9-e40b-4ab8-8daa-b557e3e2d373" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInClientFundsHeld_9a0dea1f-1366-40db-9809-c92d339985ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInClientFundsHeld"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_30c90e7d-0ba3-497b-8857-c43125100a82" xlink:to="loc_us-gaap_IncreaseDecreaseInClientFundsHeld_9a0dea1f-1366-40db-9809-c92d339985ae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_IncreaseDecreaseInFiduciaryLiabilities_fcca1082-593a-4425-8ff8-42615405295a" xlink:href="aon-20201231.xsd#aon_IncreaseDecreaseInFiduciaryLiabilities"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_30c90e7d-0ba3-497b-8857-c43125100a82" xlink:to="loc_aon_IncreaseDecreaseInFiduciaryLiabilities_fcca1082-593a-4425-8ff8-42615405295a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInReceivables_97c46773-dc0e-4855-b1ee-9fc61896d9ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInReceivables"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_30c90e7d-0ba3-497b-8857-c43125100a82" xlink:to="loc_us-gaap_IncreaseDecreaseInReceivables_97c46773-dc0e-4855-b1ee-9fc61896d9ee" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_b2e8ac5c-0c7d-4609-840a-3c816fc83061" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_30c90e7d-0ba3-497b-8857-c43125100a82" xlink:to="loc_us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities_b2e8ac5c-0c7d-4609-840a-3c816fc83061" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInRestructuringReserve_f1c4a8de-7ad4-425c-968b-5c4b30f3236d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInRestructuringReserve"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_30c90e7d-0ba3-497b-8857-c43125100a82" xlink:to="loc_us-gaap_IncreaseDecreaseInRestructuringReserve_f1c4a8de-7ad4-425c-968b-5c4b30f3236d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_c8b7ea76-af82-4773-aa7c-d7d046bcdee5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_30c90e7d-0ba3-497b-8857-c43125100a82" xlink:to="loc_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_c8b7ea76-af82-4773-aa7c-d7d046bcdee5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_c7748240-8367-4557-a07e-df80d9032e59" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_30c90e7d-0ba3-497b-8857-c43125100a82" xlink:to="loc_us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations_c7748240-8367-4557-a07e-df80d9032e59" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_b485106c-7c1e-4d9b-9cc9-57eecdb84226" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncreaseDecreaseInOperatingCapitalAbstract_30c90e7d-0ba3-497b-8857-c43125100a82" xlink:to="loc_us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet_b485106c-7c1e-4d9b-9cc9-57eecdb84226" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_c0ab9280-d313-485d-958d-5119124e629a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivitiesAbstract_6ae57156-d24f-43ad-af9d-5ef71801bc13" xlink:to="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_c0ab9280-d313-485d-958d-5119124e629a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9e1f4bcc-aa0a-47c9-a7ff-43ca47b53a63" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_d6e39aa3-8a98-4896-9720-d1b7a5ede7f4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9e1f4bcc-aa0a-47c9-a7ff-43ca47b53a63" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments_ea37a9d6-6d72-46dc-943c-f677930d9704" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9e1f4bcc-aa0a-47c9-a7ff-43ca47b53a63" xlink:to="loc_us-gaap_ProceedsFromSaleAndMaturityOfOtherInvestments_ea37a9d6-6d72-46dc-943c-f677930d9704" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireOtherInvestments_65a27c25-5369-43e4-9353-0679d28805ed" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireOtherInvestments"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9e1f4bcc-aa0a-47c9-a7ff-43ca47b53a63" xlink:to="loc_us-gaap_PaymentsToAcquireOtherInvestments_65a27c25-5369-43e4-9353-0679d28805ed" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_PaymentsForProceedsFromMarketableSecurities_c22398de-e8cc-441a-b23c-4e46673e3f4b" xlink:href="aon-20201231.xsd#aon_PaymentsForProceedsFromMarketableSecurities"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9e1f4bcc-aa0a-47c9-a7ff-43ca47b53a63" xlink:to="loc_aon_PaymentsForProceedsFromMarketableSecurities_c22398de-e8cc-441a-b23c-4e46673e3f4b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_b89ba3e6-3880-4ad5-a4e0-5a8f11b1ae2a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9e1f4bcc-aa0a-47c9-a7ff-43ca47b53a63" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_b89ba3e6-3880-4ad5-a4e0-5a8f11b1ae2a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_60955a63-6bc3-4492-8421-0d3fc812399f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9e1f4bcc-aa0a-47c9-a7ff-43ca47b53a63" xlink:to="loc_us-gaap_ProceedsFromDivestitureOfBusinessesNetOfCashDivested_60955a63-6bc3-4492-8421-0d3fc812399f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_fc8daa0c-f456-4966-9d8a-242166b1f339" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9e1f4bcc-aa0a-47c9-a7ff-43ca47b53a63" xlink:to="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_fc8daa0c-f456-4966-9d8a-242166b1f339" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_6c3fe89f-68af-4fac-87d2-a68f22528147" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_9e1f4bcc-aa0a-47c9-a7ff-43ca47b53a63" xlink:to="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_6c3fe89f-68af-4fac-87d2-a68f22528147" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0f017537-f5e1-4a3e-970b-af6d9939aec3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_d6e39aa3-8a98-4896-9720-d1b7a5ede7f4" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0f017537-f5e1-4a3e-970b-af6d9939aec3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfEquity_4f7dc521-105d-4eae-91c2-ec63d8d02432" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForRepurchaseOfEquity"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0f017537-f5e1-4a3e-970b-af6d9939aec3" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfEquity_4f7dc521-105d-4eae-91c2-ec63d8d02432" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_4b79cf29-16ce-49cf-bac8-5e58dc3c355d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0f017537-f5e1-4a3e-970b-af6d9939aec3" xlink:to="loc_us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation_4b79cf29-16ce-49cf-bac8-5e58dc3c355d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_5227670c-f616-4ba3-bd8b-a442176f1ea5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProceedsFromIssuanceOfLongTermDebt"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0f017537-f5e1-4a3e-970b-af6d9939aec3" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfLongTermDebt_5227670c-f616-4ba3-bd8b-a442176f1ea5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_f29b672f-a53d-4c4d-a121-2b1748d87e44" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0f017537-f5e1-4a3e-970b-af6d9939aec3" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_f29b672f-a53d-4c4d-a121-2b1748d87e44" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfDividendsCommonStock_7beae402-761b-4e99-8279-faa075a41fd7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsOfDividendsCommonStock"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0f017537-f5e1-4a3e-970b-af6d9939aec3" xlink:to="loc_us-gaap_PaymentsOfDividendsCommonStock_7beae402-761b-4e99-8279-faa075a41fd7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToMinorityShareholders_aa28831e-2ae1-4048-a2ef-c8d2e62ab8fa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToMinorityShareholders"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0f017537-f5e1-4a3e-970b-af6d9939aec3" xlink:to="loc_us-gaap_PaymentsToMinorityShareholders_aa28831e-2ae1-4048-a2ef-c8d2e62ab8fa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_f9701bad-051a-4ae4-ae8f-2f9da6bf5cde" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivities"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_0f017537-f5e1-4a3e-970b-af6d9939aec3" xlink:to="loc_us-gaap_NetCashProvidedByUsedInFinancingActivities_f9701bad-051a-4ae4-ae8f-2f9da6bf5cde" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_e2f0d017-c317-469d-9273-c30e0c03be7e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_d6e39aa3-8a98-4896-9720-d1b7a5ede7f4" xlink:to="loc_us-gaap_EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents_e2f0d017-c317-469d-9273-c30e0c03be7e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_3b4ed0da-3b28-471b-bd97-3a8b95908d1d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_d6e39aa3-8a98-4896-9720-d1b7a5ede7f4" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect_3b4ed0da-3b28-471b-bd97-3a8b95908d1d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_2dea52d3-0069-41eb-a5e5-7b54d5aac782" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_d6e39aa3-8a98-4896-9720-d1b7a5ede7f4" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_2dea52d3-0069-41eb-a5e5-7b54d5aac782" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_dbf02ee2-803f-4a1f-9772-6b46b28a5176" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_d6e39aa3-8a98-4896-9720-d1b7a5ede7f4" xlink:to="loc_us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations_dbf02ee2-803f-4a1f-9772-6b46b28a5176" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SupplementalCashFlowInformationAbstract_7240c8e6-2104-4709-a0e9-8bc108e54867" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SupplementalCashFlowInformationAbstract"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementOfCashFlowsAbstract_d6e39aa3-8a98-4896-9720-d1b7a5ede7f4" xlink:to="loc_us-gaap_SupplementalCashFlowInformationAbstract_7240c8e6-2104-4709-a0e9-8bc108e54867" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestPaidNet_30e793fe-b016-414c-aa44-e97145a1416b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestPaidNet"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_7240c8e6-2104-4709-a0e9-8bc108e54867" xlink:to="loc_us-gaap_InterestPaidNet_30e793fe-b016-414c-aa44-e97145a1416b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesPaidNet_d60648da-337c-4ba6-b956-8c0391da1d71" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxesPaidNet"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SupplementalCashFlowInformationAbstract_7240c8e6-2104-4709-a0e9-8bc108e54867" xlink:to="loc_us-gaap_IncomeTaxesPaidNet_d60648da-337c-4ba6-b956-8c0391da1d71" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/BasisofPresentation" xlink:type="simple" xlink:href="aon-20201231.xsd#BasisofPresentation"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/BasisofPresentation" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_82c496a1-5485-4cfe-9f8e-3566710abe84" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_bf4ce596-2f93-4f4c-9f45-0782cc1d17bc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_82c496a1-5485-4cfe-9f8e-3566710abe84" xlink:to="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsDisclosureTextBlock_bf4ce596-2f93-4f4c-9f45-0782cc1d17bc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/BasisofPresentationDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#BasisofPresentationDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/BasisofPresentationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_ba8157c5-35b4-4a28-9ded-b9e497d36076" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CommonStockExchangeRatioRelatedToReorganization_487ba0fd-d42c-4fb3-94b5-1b79fb0a7304" xlink:href="aon-20201231.xsd#aon_CommonStockExchangeRatioRelatedToReorganization"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract_ba8157c5-35b4-4a28-9ded-b9e497d36076" xlink:to="loc_aon_CommonStockExchangeRatioRelatedToReorganization_487ba0fd-d42c-4fb3-94b5-1b79fb0a7304" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/SummaryofSignificantAccountingPrinciplesandPractices" xlink:type="simple" xlink:href="aon-20201231.xsd#SummaryofSignificantAccountingPrinciplesandPractices"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/SummaryofSignificantAccountingPrinciplesandPractices" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_a30bdf58-3ef3-40d6-91a4-fcf8e2d4c8d8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountingPoliciesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SignificantAccountingPoliciesTextBlock_7356485d-2f1f-45d8-ac96-c0ef8be07487" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SignificantAccountingPoliciesTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_a30bdf58-3ef3-40d6-91a4-fcf8e2d4c8d8" xlink:to="loc_us-gaap_SignificantAccountingPoliciesTextBlock_7356485d-2f1f-45d8-ac96-c0ef8be07487" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/SummaryofSignificantAccountingPrinciplesandPracticesPolicies" xlink:type="simple" xlink:href="aon-20201231.xsd#SummaryofSignificantAccountingPrinciplesandPracticesPolicies"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/SummaryofSignificantAccountingPrinciplesandPracticesPolicies" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountingPoliciesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_e36a2b9b-a388-4fa6-ad6e-7ebf527b3360" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BasisOfAccountingPolicyPolicyTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_BasisOfAccountingPolicyPolicyTextBlock_e36a2b9b-a388-4fa6-ad6e-7ebf527b3360" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UseOfEstimates_6b3719a8-e5a5-4637-8e35-e18a5e8dfdaa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UseOfEstimates"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_UseOfEstimates_6b3719a8-e5a5-4637-8e35-e18a5e8dfdaa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_b7a3485e-0b72-43cb-9ed6-69de537a0e10" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerPolicyTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerPolicyTextBlock_b7a3485e-0b72-43cb-9ed6-69de537a0e10" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationRelatedCostsPolicyTextBlock_ea5fd2e7-5c32-40f3-9141-a76871bedb17" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationRelatedCostsPolicyTextBlock"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_CompensationRelatedCostsPolicyTextBlock_ea5fd2e7-5c32-40f3-9141-a76871bedb17" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementPlansPensionsPolicy_00834b53-3393-4e49-95d9-43aace06c33d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionAndOtherPostretirementPlansPensionsPolicy"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_PensionAndOtherPostretirementPlansPensionsPolicy_00834b53-3393-4e49-95d9-43aace06c33d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EarningsPerSharePolicyTextBlock_37cc6985-d992-4214-b833-5905524b1d2e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EarningsPerSharePolicyTextBlock"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_EarningsPerSharePolicyTextBlock_37cc6985-d992-4214-b833-5905524b1d2e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CashCashEquivalentsAndShortTermInvestmentsPolicyTextBlock_63bb6798-4dd0-4c51-9316-2371a7705eab" xlink:href="aon-20201231.xsd#aon_CashCashEquivalentsAndShortTermInvestmentsPolicyTextBlock"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_aon_CashCashEquivalentsAndShortTermInvestmentsPolicyTextBlock_63bb6798-4dd0-4c51-9316-2371a7705eab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialAssetsServicingOfFinancialAssetsPolicy_b6f0f814-f2ec-40f6-a6d4-4cbcbf374efa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialAssetsServicingOfFinancialAssetsPolicy"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialAssetsServicingOfFinancialAssetsPolicy_b6f0f814-f2ec-40f6-a6d4-4cbcbf374efa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeAndOtherAccountsReceivablePolicy_0c46b562-6c4d-4df9-a409-1bf6a719100d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TradeAndOtherAccountsReceivablePolicy"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_TradeAndOtherAccountsReceivablePolicy_0c46b562-6c4d-4df9-a409-1bf6a719100d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_99d431b4-eaf0-4a1a-abae-f5837ad7428a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentPolicyTextBlock"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentPolicyTextBlock_99d431b4-eaf0-4a1a-abae-f5837ad7428a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_8e8a52c7-704f-447c-90e4-a56ab1055e6f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetsPolicyTextBlock_8e8a52c7-704f-447c-90e4-a56ab1055e6f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativesPolicyTextBlock_e9bbab28-3826-44f0-b26d-6d3d69a97c23" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativesPolicyTextBlock"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_DerivativesPolicyTextBlock_e9bbab28-3826-44f0-b26d-6d3d69a97c23" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_ea34694e-b3c9-40c6-b9da-9df325e0db2f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_ForeignCurrencyTransactionsAndTranslationsPolicyTextBlock_ea34694e-b3c9-40c6-b9da-9df325e0db2f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxPolicyTextBlock_abef7126-fd51-4dd6-a8a2-c6bb722db271" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxPolicyTextBlock"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_IncomeTaxPolicyTextBlock_abef7126-fd51-4dd6-a8a2-c6bb722db271" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LessorLeasesPolicyTextBlock_f3f6b4e3-5943-4cf9-b7d7-d5480b3398c3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LessorLeasesPolicyTextBlock"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_LessorLeasesPolicyTextBlock_f3f6b4e3-5943-4cf9-b7d7-d5480b3398c3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConsolidationPolicyTextBlock_484cc74b-a519-403e-b5a1-b38682e1f049" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConsolidationPolicyTextBlock"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_ConsolidationPolicyTextBlock_484cc74b-a519-403e-b5a1-b38682e1f049" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_14b48ad0-b120-4d49-9af0-de1e0edfb6bc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock"/>
    <link:presentationArc order="17" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlock_14b48ad0-b120-4d49-9af0-de1e0edfb6bc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_a4e20cf4-2d99-4c2a-bd1e-d5f0f848344f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementPolicyPolicyTextBlock"/>
    <link:presentationArc order="18" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_0031a7f1-124b-40b6-b3fe-88f898a0b0b4" xlink:to="loc_us-gaap_FairValueMeasurementPolicyPolicyTextBlock_a4e20cf4-2d99-4c2a-bd1e-d5f0f848344f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/SummaryofSignificantAccountingPrinciplesandPracticesTables" xlink:type="simple" xlink:href="aon-20201231.xsd#SummaryofSignificantAccountingPrinciplesandPracticesTables"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/SummaryofSignificantAccountingPrinciplesandPracticesTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_9c596c96-8970-4c14-8fff-e2bc3606dcbf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountingPoliciesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_96184775-aea5-4dfe-80ec-c1eb83b9769d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_9c596c96-8970-4c14-8fff-e2bc3606dcbf" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTextBlock_96184775-aea5-4dfe-80ec-c1eb83b9769d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_a413538b-1882-4c59-a9e3-41ab76441a29" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_9c596c96-8970-4c14-8fff-e2bc3606dcbf" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_a413538b-1882-4c59-a9e3-41ab76441a29" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/SummaryofSignificantAccountingPrinciplesandPracticesAdditionalInformationDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#SummaryofSignificantAccountingPrinciplesandPracticesAdditionalInformationDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/SummaryofSignificantAccountingPrinciplesandPracticesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingPoliciesAbstract_361f79a6-860f-4ff5-84a7-283c9e48109d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountingPoliciesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_SummaryOfSignificantAccountingPoliciesTable_6c543e7e-4124-4fb5-ae41-c8c243f4f909" xlink:href="aon-20201231.xsd#aon_SummaryOfSignificantAccountingPoliciesTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountingPoliciesAbstract_361f79a6-860f-4ff5-84a7-283c9e48109d" xlink:to="loc_aon_SummaryOfSignificantAccountingPoliciesTable_6c543e7e-4124-4fb5-ae41-c8c243f4f909" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_d8e65a11-431f-4df9-ad75-49cc3903f444" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesTable_6c543e7e-4124-4fb5-ae41-c8c243f4f909" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_d8e65a11-431f-4df9-ad75-49cc3903f444" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a66671f9-7e9f-49ef-8b38-7f69c7061bb6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_d8e65a11-431f-4df9-ad75-49cc3903f444" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a66671f9-7e9f-49ef-8b38-7f69c7061bb6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_edc11cd6-4d45-4934-b40b-efd934de95e9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a66671f9-7e9f-49ef-8b38-7f69c7061bb6" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_edc11cd6-4d45-4934-b40b-efd934de95e9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_eaa8523d-db58-4606-907e-15384035fbc9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a66671f9-7e9f-49ef-8b38-7f69c7061bb6" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_eaa8523d-db58-4606-907e-15384035fbc9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FurnitureFixturesAndEquipmentMember_6591573c-8c7d-4b5f-afe5-c597e4cb1638" xlink:href="aon-20201231.xsd#aon_FurnitureFixturesAndEquipmentMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a66671f9-7e9f-49ef-8b38-7f69c7061bb6" xlink:to="loc_aon_FurnitureFixturesAndEquipmentMember_6591573c-8c7d-4b5f-afe5-c597e4cb1638" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerEquipmentMember_af2f45da-84a1-4ac5-895e-d3c5eca31fec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComputerEquipmentMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a66671f9-7e9f-49ef-8b38-7f69c7061bb6" xlink:to="loc_us-gaap_ComputerEquipmentMember_af2f45da-84a1-4ac5-895e-d3c5eca31fec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_ca852fab-3be9-4d0f-a45e-a6d8d8b1ddf9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BuildingMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a66671f9-7e9f-49ef-8b38-7f69c7061bb6" xlink:to="loc_us-gaap_BuildingMember_ca852fab-3be9-4d0f-a45e-a6d8d8b1ddf9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AutomobilesMember_81391adb-00b8-4217-845f-b27788609afd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AutomobilesMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_a66671f9-7e9f-49ef-8b38-7f69c7061bb6" xlink:to="loc_us-gaap_AutomobilesMember_81391adb-00b8-4217-845f-b27788609afd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ae6af692-c4ee-4cb4-a38b-a90f9e556749" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesTable_6c543e7e-4124-4fb5-ae41-c8c243f4f909" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ae6af692-c4ee-4cb4-a38b-a90f9e556749" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a1de50aa-0e7a-4634-888c-928b57707552" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_ae6af692-c4ee-4cb4-a38b-a90f9e556749" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a1de50aa-0e7a-4634-888c-928b57707552" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_b39f1c87-9431-49b2-a83e-ccb1ee622b13" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TradeNamesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a1de50aa-0e7a-4634-888c-928b57707552" xlink:to="loc_us-gaap_TradeNamesMember_b39f1c87-9431-49b2-a83e-ccb1ee622b13" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CustomerRelatedAndContractBasedMember_f5ac2941-a791-41ae-a6fe-8b5e74b611ce" xlink:href="aon-20201231.xsd#aon_CustomerRelatedAndContractBasedMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a1de50aa-0e7a-4634-888c-928b57707552" xlink:to="loc_aon_CustomerRelatedAndContractBasedMember_f5ac2941-a791-41ae-a6fe-8b5e74b611ce" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_MarketingTechnologyAndOtherMember_d0fb04aa-f725-4a5e-8d04-df8bfb0d5a7d" xlink:href="aon-20201231.xsd#aon_MarketingTechnologyAndOtherMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_a1de50aa-0e7a-4634-888c-928b57707552" xlink:to="loc_aon_MarketingTechnologyAndOtherMember_d0fb04aa-f725-4a5e-8d04-df8bfb0d5a7d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_8ca902ee-51b6-46ce-b193-b7b7f8920b3a" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesTable_6c543e7e-4124-4fb5-ae41-c8c243f4f909" xlink:to="loc_srt_RangeAxis_8ca902ee-51b6-46ce-b193-b7b7f8920b3a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_a3cea0ae-b5fa-4e92-a7ec-40b75bc587a1" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_8ca902ee-51b6-46ce-b193-b7b7f8920b3a" xlink:to="loc_srt_RangeMember_a3cea0ae-b5fa-4e92-a7ec-40b75bc587a1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_ea7e51b9-2f8b-4b27-a448-6c0b9cf1dd87" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_a3cea0ae-b5fa-4e92-a7ec-40b75bc587a1" xlink:to="loc_srt_MinimumMember_ea7e51b9-2f8b-4b27-a448-6c0b9cf1dd87" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_97e122c3-1da4-46f9-ab0a-716204d46c27" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_a3cea0ae-b5fa-4e92-a7ec-40b75bc587a1" xlink:to="loc_srt_MaximumMember_97e122c3-1da4-46f9-ab0a-716204d46c27" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_d23e8a6d-a192-4a76-979a-1824a5dfc4d5" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesTable_6c543e7e-4124-4fb5-ae41-c8c243f4f909" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_d23e8a6d-a192-4a76-979a-1824a5dfc4d5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_1f4b5b88-e80d-4d28-83c7-1559e89c408b" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_d23e8a6d-a192-4a76-979a-1824a5dfc4d5" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_1f4b5b88-e80d-4d28-83c7-1559e89c408b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_dc907617-0dc5-42e8-8741-b2b6bde233aa" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_1f4b5b88-e80d-4d28-83c7-1559e89c408b" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_dc907617-0dc5-42e8-8741-b2b6bde233aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_181d53ee-0c9f-4310-99e4-8d40ea7bd9bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesTable_6c543e7e-4124-4fb5-ae41-c8c243f4f909" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_181d53ee-0c9f-4310-99e4-8d40ea7bd9bd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_04ecede3-ebf1-4854-8f6a-18b12f0cce3d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_181d53ee-0c9f-4310-99e4-8d40ea7bd9bd" xlink:to="loc_us-gaap_EquityComponentDomain_04ecede3-ebf1-4854-8f6a-18b12f0cce3d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_bc12a37a-428e-4937-a492-8398021d7f33" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_04ecede3-ebf1-4854-8f6a-18b12f0cce3d" xlink:to="loc_us-gaap_RetainedEarningsMember_bc12a37a-428e-4937-a492-8398021d7f33" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_2582d0e6-f798-4e1c-b3b8-0c2227162fd0" xlink:href="aon-20201231.xsd#aon_SummaryOfSignificantAccountingPoliciesLineItems"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesTable_6c543e7e-4124-4fb5-ae41-c8c243f4f909" xlink:to="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_2582d0e6-f798-4e1c-b3b8-0c2227162fd0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAbstract_91de895d-6a9c-42ef-97ee-b9ed97b5cbf4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashAndCashEquivalentsAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_2582d0e6-f798-4e1c-b3b8-0c2227162fd0" xlink:to="loc_us-gaap_CashAndCashEquivalentsAbstract_91de895d-6a9c-42ef-97ee-b9ed97b5cbf4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CashandCashEquivalentsandShortTermInvestments_c627ddbf-2a4c-4c7b-9a62-598f03959df9" xlink:href="aon-20201231.xsd#aon_CashandCashEquivalentsandShortTermInvestments"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CashAndCashEquivalentsAbstract_91de895d-6a9c-42ef-97ee-b9ed97b5cbf4" xlink:to="loc_aon_CashandCashEquivalentsandShortTermInvestments_c627ddbf-2a4c-4c7b-9a62-598f03959df9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedCashAndInvestmentsCurrent_0c9dce48-abd0-43d1-95fc-11d03d6afb7c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedCashAndInvestmentsCurrent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CashAndCashEquivalentsAbstract_91de895d-6a9c-42ef-97ee-b9ed97b5cbf4" xlink:to="loc_us-gaap_RestrictedCashAndInvestmentsCurrent_0c9dce48-abd0-43d1-95fc-11d03d6afb7c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_RestrictedCashOperatingFunds_26907970-fa29-4dfe-8f2c-3cc04b1d5caa" xlink:href="aon-20201231.xsd#aon_RestrictedCashOperatingFunds"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CashAndCashEquivalentsAbstract_91de895d-6a9c-42ef-97ee-b9ed97b5cbf4" xlink:to="loc_aon_RestrictedCashOperatingFunds_26907970-fa29-4dfe-8f2c-3cc04b1d5caa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FiduciaryAssetsAndLiabilitiesAbstract_a0b83a6c-2816-46a8-9ab3-85b9260b55c2" xlink:href="aon-20201231.xsd#aon_FiduciaryAssetsAndLiabilitiesAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_2582d0e6-f798-4e1c-b3b8-0c2227162fd0" xlink:to="loc_aon_FiduciaryAssetsAndLiabilitiesAbstract_a0b83a6c-2816-46a8-9ab3-85b9260b55c2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FiduciaryAssetsPremiumTrustBalances_cc7a5b05-0165-477d-9ac7-5f2282b3b439" xlink:href="aon-20201231.xsd#aon_FiduciaryAssetsPremiumTrustBalances"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_FiduciaryAssetsAndLiabilitiesAbstract_a0b83a6c-2816-46a8-9ab3-85b9260b55c2" xlink:to="loc_aon_FiduciaryAssetsPremiumTrustBalances_cc7a5b05-0165-477d-9ac7-5f2282b3b439" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetAbstract_51ed785c-3a0d-4d30-89ae-101f1289beb4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccountsReceivableNetAbstract"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_2582d0e6-f798-4e1c-b3b8-0c2227162fd0" xlink:to="loc_us-gaap_AccountsReceivableNetAbstract_51ed785c-3a0d-4d30-89ae-101f1289beb4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_b13ef089-13df-4a50-88d3-b97fd6717910" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccountsReceivableNetAbstract_51ed785c-3a0d-4d30-89ae-101f1289beb4" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_b13ef089-13df-4a50-88d3-b97fd6717910" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentAbstract_2a125043-3440-4c60-9f9f-050ae099467e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentAbstract"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_2582d0e6-f798-4e1c-b3b8-0c2227162fd0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentAbstract_2a125043-3440-4c60-9f9f-050ae099467e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_963a1eaf-23da-46c3-a30f-e088b415e4ed" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentAbstract_2a125043-3440-4c60-9f9f-050ae099467e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_963a1eaf-23da-46c3-a30f-e088b415e4ed" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FiniteLivedIntangibleAssetAbstract_c088aa57-6b9d-4f6a-90f0-9f883c1949b3" xlink:href="aon-20201231.xsd#aon_FiniteLivedIntangibleAssetAbstract"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_2582d0e6-f798-4e1c-b3b8-0c2227162fd0" xlink:to="loc_aon_FiniteLivedIntangibleAssetAbstract_c088aa57-6b9d-4f6a-90f0-9f883c1949b3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_db7c22eb-669a-4273-bc92-2cae768525d5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetUsefulLife"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_FiniteLivedIntangibleAssetAbstract_c088aa57-6b9d-4f6a-90f0-9f883c1949b3" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetUsefulLife_db7c22eb-669a-4273-bc92-2cae768525d5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_66b2bbb9-f5cd-4798-9523-83c803045dc8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_SummaryOfSignificantAccountingPoliciesLineItems_2582d0e6-f798-4e1c-b3b8-0c2227162fd0" xlink:to="loc_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_66b2bbb9-f5cd-4798-9523-83c803045dc8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_c9db4ec1-ae48-4fae-b04d-8239c1170746" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsAndChangesInAccountingPrinciplesAbstract_66b2bbb9-f5cd-4798-9523-83c803045dc8" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_c9db4ec1-ae48-4fae-b04d-8239c1170746" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/RevenuefromContractswithCustomers" xlink:type="simple" xlink:href="aon-20201231.xsd#RevenuefromContractswithCustomers"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/RevenuefromContractswithCustomers" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_1d6ed1f1-dc50-46ad-b530-75b84b88a8a6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerTextBlock_0b29e364-b5a6-437b-81ac-b1d8cc7a0c01" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_1d6ed1f1-dc50-46ad-b530-75b84b88a8a6" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerTextBlock_0b29e364-b5a6-437b-81ac-b1d8cc7a0c01" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/RevenuefromContractswithCustomersTables" xlink:type="simple" xlink:href="aon-20201231.xsd#RevenuefromContractswithCustomersTables"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/RevenuefromContractswithCustomersTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_6391e0b0-3d3c-4dbe-ab1c-ecea7caddcf9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_e58ed2db-3253-44a2-a48b-96fd30cc298c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_6391e0b0-3d3c-4dbe-ab1c-ecea7caddcf9" xlink:to="loc_us-gaap_DisaggregationOfRevenueTableTextBlock_e58ed2db-3253-44a2-a48b-96fd30cc298c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostTableTextBlock_107c973d-9015-42fa-956c-e8b2535a4137" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedContractCostTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_6391e0b0-3d3c-4dbe-ab1c-ecea7caddcf9" xlink:to="loc_us-gaap_CapitalizedContractCostTableTextBlock_107c973d-9015-42fa-956c-e8b2535a4137" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/RevenuefromContractswithCustomersDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#RevenuefromContractswithCustomersDisaggregationofRevenueDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/RevenuefromContractswithCustomersDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_8aac1281-4647-4c89-95cf-ac988966de8c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_ff47cb34-7fe9-4a1c-bd77-ca58f5a9e663" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_8aac1281-4647-4c89-95cf-ac988966de8c" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_ff47cb34-7fe9-4a1c-bd77-ca58f5a9e663" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_006af103-3455-4ac2-89a2-8d24cd2d65c5" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidationItemsAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_ff47cb34-7fe9-4a1c-bd77-ca58f5a9e663" xlink:to="loc_srt_ConsolidationItemsAxis_006af103-3455-4ac2-89a2-8d24cd2d65c5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_cbb2ed01-991c-4b15-88e8-997a3673786e" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ConsolidationItemsDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsAxis_006af103-3455-4ac2-89a2-8d24cd2d65c5" xlink:to="loc_srt_ConsolidationItemsDomain_cbb2ed01-991c-4b15-88e8-997a3673786e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_EliminationsAndReconcilingItemsMember_a4bb454e-c502-4bce-9ea2-b189dc7cefdd" xlink:href="aon-20201231.xsd#aon_EliminationsAndReconcilingItemsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ConsolidationItemsDomain_cbb2ed01-991c-4b15-88e8-997a3673786e" xlink:to="loc_aon_EliminationsAndReconcilingItemsMember_a4bb454e-c502-4bce-9ea2-b189dc7cefdd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_f7f0c2d8-b06e-402d-ade4-b7b03f04c4f9" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductOrServiceAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_ff47cb34-7fe9-4a1c-bd77-ca58f5a9e663" xlink:to="loc_srt_ProductOrServiceAxis_f7f0c2d8-b06e-402d-ade4-b7b03f04c4f9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_f2acd298-3866-4664-8206-806130516312" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_ProductsAndServicesDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductOrServiceAxis_f7f0c2d8-b06e-402d-ade4-b7b03f04c4f9" xlink:to="loc_srt_ProductsAndServicesDomain_f2acd298-3866-4664-8206-806130516312" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_PCAdvisoryMember_37fc0e16-8284-4da5-9079-b3b1a9c32c7d" xlink:href="aon-20201231.xsd#aon_PCAdvisoryMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_f2acd298-3866-4664-8206-806130516312" xlink:to="loc_aon_PCAdvisoryMember_37fc0e16-8284-4da5-9079-b3b1a9c32c7d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ReinsuranceMember_b80a6359-c331-404e-b0a5-3df292cf52c5" xlink:href="aon-20201231.xsd#aon_ReinsuranceMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_f2acd298-3866-4664-8206-806130516312" xlink:to="loc_aon_ReinsuranceMember_b80a6359-c331-404e-b0a5-3df292cf52c5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_RetirementMember_a70aced6-0c1a-4236-b598-3c1020800e26" xlink:href="aon-20201231.xsd#aon_RetirementMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_f2acd298-3866-4664-8206-806130516312" xlink:to="loc_aon_RetirementMember_a70aced6-0c1a-4236-b598-3c1020800e26" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_HealthMember_6f5f2835-b079-4eed-8dac-9994628fb3d0" xlink:href="aon-20201231.xsd#aon_HealthMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_f2acd298-3866-4664-8206-806130516312" xlink:to="loc_aon_HealthMember_6f5f2835-b079-4eed-8dac-9994628fb3d0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DataSolutionsMember_31e73066-054f-4db9-b03d-0c690e0766ac" xlink:href="aon-20201231.xsd#aon_DataSolutionsMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_ProductsAndServicesDomain_f2acd298-3866-4664-8206-806130516312" xlink:to="loc_aon_DataSolutionsMember_31e73066-054f-4db9-b03d-0c690e0766ac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_e015df32-09da-4556-b688-4def6a79a78e" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_ff47cb34-7fe9-4a1c-bd77-ca58f5a9e663" xlink:to="loc_srt_StatementGeographicalAxis_e015df32-09da-4556-b688-4def6a79a78e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_b80c5422-1400-42bc-a9c3-dac741c96bd4" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_StatementGeographicalAxis_e015df32-09da-4556-b688-4def6a79a78e" xlink:to="loc_srt_SegmentGeographicalDomain_b80c5422-1400-42bc-a9c3-dac741c96bd4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_7075b115-d6b8-4e0b-92ed-a9299d0a6166" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_b80c5422-1400-42bc-a9c3-dac741c96bd4" xlink:to="loc_country_US_7075b115-d6b8-4e0b-92ed-a9299d0a6166" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_AmericasOtherthanUnitedStatesMember_9082c4a1-2823-4561-ab6a-6e9d670a5997" xlink:href="aon-20201231.xsd#aon_AmericasOtherthanUnitedStatesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_b80c5422-1400-42bc-a9c3-dac741c96bd4" xlink:to="loc_aon_AmericasOtherthanUnitedStatesMember_9082c4a1-2823-4561-ab6a-6e9d670a5997" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_89501742-0ff1-440a-abf5-610d32fa5cf8" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_b80c5422-1400-42bc-a9c3-dac741c96bd4" xlink:to="loc_country_GB_89501742-0ff1-440a-abf5-610d32fa5cf8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IE_e3c63b13-1e5c-49ee-8ce7-dfad5c0f70ed" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_IE"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_b80c5422-1400-42bc-a9c3-dac741c96bd4" xlink:to="loc_country_IE_e3c63b13-1e5c-49ee-8ce7-dfad5c0f70ed" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_EuropeMiddleEastAndAfricaMember_5a971fef-3183-4be8-b718-237863ca04eb" xlink:href="aon-20201231.xsd#aon_EuropeMiddleEastAndAfricaMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_b80c5422-1400-42bc-a9c3-dac741c96bd4" xlink:to="loc_aon_EuropeMiddleEastAndAfricaMember_5a971fef-3183-4be8-b718-237863ca04eb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_354260d7-ec76-4428-841f-01fc69d9213f" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_AsiaPacificMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_b80c5422-1400-42bc-a9c3-dac741c96bd4" xlink:to="loc_srt_AsiaPacificMember_354260d7-ec76-4428-841f-01fc69d9213f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_7a112a9e-0e77-44af-8641-e5174054c354" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_ff47cb34-7fe9-4a1c-bd77-ca58f5a9e663" xlink:to="loc_us-gaap_DisaggregationOfRevenueLineItems_7a112a9e-0e77-44af-8641-e5174054c354" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_1ecf5248-8ec1-4370-8634-94a244e4685a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_7a112a9e-0e77-44af-8641-e5174054c354" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_1ecf5248-8ec1-4370-8634-94a244e4685a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/RevenuefromContractswithCustomersContractAssetsRollforwardDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#RevenuefromContractswithCustomersContractAssetsRollforwardDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/RevenuefromContractswithCustomersContractAssetsRollforwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerAbstract_e0d684e7-7e8a-4749-bcf6-28e2f90d1f55" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueFromContractWithCustomerAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_c5aec4f6-da17-49d1-b208-dc61b1059fde" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueFromContractWithCustomerAbstract_e0d684e7-7e8a-4749-bcf6-28e2f90d1f55" xlink:to="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_c5aec4f6-da17-49d1-b208-dc61b1059fde" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAxis_aa22101e-03c1-4f19-92a7-6c5dc5d91bd8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedContractCostAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_c5aec4f6-da17-49d1-b208-dc61b1059fde" xlink:to="loc_us-gaap_CapitalizedContractCostAxis_aa22101e-03c1-4f19-92a7-6c5dc5d91bd8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostDomain_8d0e1ffd-d296-40e4-ad3b-34bea725f9c0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedContractCostDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CapitalizedContractCostAxis_aa22101e-03c1-4f19-92a7-6c5dc5d91bd8" xlink:to="loc_us-gaap_CapitalizedContractCostDomain_8d0e1ffd-d296-40e4-ad3b-34bea725f9c0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CapitalizedCostToFulfillCustomerContractsMember_6f3abbd8-7ef6-4297-a562-10b092057953" xlink:href="aon-20201231.xsd#aon_CapitalizedCostToFulfillCustomerContractsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_8d0e1ffd-d296-40e4-ad3b-34bea725f9c0" xlink:to="loc_aon_CapitalizedCostToFulfillCustomerContractsMember_6f3abbd8-7ef6-4297-a562-10b092057953" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CapitalizedCostToObtainCustomerContractsMember_07937e9a-f088-4e55-8780-1bba2f7c7b20" xlink:href="aon-20201231.xsd#aon_CapitalizedCostToObtainCustomerContractsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CapitalizedContractCostDomain_8d0e1ffd-d296-40e4-ad3b-34bea725f9c0" xlink:to="loc_aon_CapitalizedCostToObtainCustomerContractsMember_07937e9a-f088-4e55-8780-1bba2f7c7b20" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_0aa0b099-d284-4c76-a603-0349c60479b3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionTable_c5aec4f6-da17-49d1-b208-dc61b1059fde" xlink:to="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_0aa0b099-d284-4c76-a603-0349c60479b3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ChangeInCapitalizedContractCostsRollForward_3c12bb62-2396-474f-a86c-3ccb4a651134" xlink:href="aon-20201231.xsd#aon_ChangeInCapitalizedContractCostsRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenueInitialApplicationPeriodCumulativeEffectTransitionLineItems_0aa0b099-d284-4c76-a603-0349c60479b3" xlink:to="loc_aon_ChangeInCapitalizedContractCostsRollForward_3c12bb62-2396-474f-a86c-3ccb4a651134" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNet_94233963-6582-4915-96ef-afce1b803bcc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedContractCostNet"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangeInCapitalizedContractCostsRollForward_3c12bb62-2396-474f-a86c-3ccb4a651134" xlink:to="loc_us-gaap_CapitalizedContractCostNet_94233963-6582-4915-96ef-afce1b803bcc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CapitalizedContractCostAdditions_f89cee7d-48ff-434c-b7e6-8096a6f333f1" xlink:href="aon-20201231.xsd#aon_CapitalizedContractCostAdditions"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangeInCapitalizedContractCostsRollForward_3c12bb62-2396-474f-a86c-3ccb4a651134" xlink:to="loc_aon_CapitalizedContractCostAdditions_f89cee7d-48ff-434c-b7e6-8096a6f333f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostAmortization_49d7c2de-df92-443e-8834-60aed86259a8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedContractCostAmortization"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangeInCapitalizedContractCostsRollForward_3c12bb62-2396-474f-a86c-3ccb4a651134" xlink:to="loc_us-gaap_CapitalizedContractCostAmortization_49d7c2de-df92-443e-8834-60aed86259a8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostImpairmentLoss_03d44226-df10-46e3-8e27-f2fca228ca6c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedContractCostImpairmentLoss"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangeInCapitalizedContractCostsRollForward_3c12bb62-2396-474f-a86c-3ccb4a651134" xlink:to="loc_us-gaap_CapitalizedContractCostImpairmentLoss_03d44226-df10-46e3-8e27-f2fca228ca6c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CapitalizedContractCostForeignCurrencyAndOtherAdjustmentsNet_1a4a2eff-0410-4f4a-a2e3-eea77d71f5d1" xlink:href="aon-20201231.xsd#aon_CapitalizedContractCostForeignCurrencyAndOtherAdjustmentsNet"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangeInCapitalizedContractCostsRollForward_3c12bb62-2396-474f-a86c-3ccb4a651134" xlink:to="loc_aon_CapitalizedContractCostForeignCurrencyAndOtherAdjustmentsNet_1a4a2eff-0410-4f4a-a2e3-eea77d71f5d1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CapitalizedContractCostNet_1080030f-b771-46cb-95e6-63d8b3bd03ab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CapitalizedContractCostNet"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangeInCapitalizedContractCostsRollForward_3c12bb62-2396-474f-a86c-3ccb4a651134" xlink:to="loc_us-gaap_CapitalizedContractCostNet_1080030f-b771-46cb-95e6-63d8b3bd03ab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/OtherFinancialData" xlink:type="simple" xlink:href="aon-20201231.xsd#OtherFinancialData"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialData" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherFinancialDataAbstract_eb67be6e-cbe9-4988-bda8-778276e61b9c" xlink:href="aon-20201231.xsd#aon_OtherFinancialDataAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalFinancialInformationDisclosureTextBlock_bb0efb2e-cb5d-48c1-8fa3-8cd0f19b4279" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AdditionalFinancialInformationDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_eb67be6e-cbe9-4988-bda8-778276e61b9c" xlink:to="loc_us-gaap_AdditionalFinancialInformationDisclosureTextBlock_bb0efb2e-cb5d-48c1-8fa3-8cd0f19b4279" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataTables" xlink:type="simple" xlink:href="aon-20201231.xsd#OtherFinancialDataTables"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherFinancialDataAbstract_5a71f4ee-e3de-46ab-990c-a6005e829b3f" xlink:href="aon-20201231.xsd#aon_OtherFinancialDataAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock_ea4aa483-604b-4507-b7b1-f6fa81b2959e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_5a71f4ee-e3de-46ab-990c-a6005e829b3f" xlink:to="loc_us-gaap_ScheduleOfOtherNonoperatingIncomeExpenseTableTextBlock_ea4aa483-604b-4507-b7b1-f6fa81b2959e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ScheduleofAccountsNotesLoansandFinancingReceivableAllowanceforDoubtfulAccountsTableTextBlock_ef25896f-0b98-4dc6-b192-f9f4fd73a563" xlink:href="aon-20201231.xsd#aon_ScheduleofAccountsNotesLoansandFinancingReceivableAllowanceforDoubtfulAccountsTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_5a71f4ee-e3de-46ab-990c-a6005e829b3f" xlink:to="loc_aon_ScheduleofAccountsNotesLoansandFinancingReceivableAllowanceforDoubtfulAccountsTableTextBlock_ef25896f-0b98-4dc6-b192-f9f4fd73a563" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock_50f2269b-cb49-4b50-9736-d6b1d6ce55ce" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_5a71f4ee-e3de-46ab-990c-a6005e829b3f" xlink:to="loc_us-gaap_ScheduleOfOtherCurrentAssetsTableTextBlock_50f2269b-cb49-4b50-9736-d6b1d6ce55ce" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ScheduleOfPropertyPlantAndEquipmentComponentsTableTextBlock_152eba29-53cf-41d9-8090-efceda8456ab" xlink:href="aon-20201231.xsd#aon_ScheduleOfPropertyPlantAndEquipmentComponentsTableTextBlock"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_5a71f4ee-e3de-46ab-990c-a6005e829b3f" xlink:to="loc_aon_ScheduleOfPropertyPlantAndEquipmentComponentsTableTextBlock_152eba29-53cf-41d9-8090-efceda8456ab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfOtherAssetsNoncurrentTextBlock_f28dca9c-d674-4ba3-82ef-ebaf2ff7325a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfOtherAssetsNoncurrentTextBlock"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_5a71f4ee-e3de-46ab-990c-a6005e829b3f" xlink:to="loc_us-gaap_ScheduleOfOtherAssetsNoncurrentTextBlock_f28dca9c-d674-4ba3-82ef-ebaf2ff7325a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesTableTextBlock_35df8b90-e559-4d31-9f00-516bef4f86f4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherCurrentLiabilitiesTableTextBlock"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_5a71f4ee-e3de-46ab-990c-a6005e829b3f" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesTableTextBlock_35df8b90-e559-4d31-9f00-516bef4f86f4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentLiabilitiesTableTextBlock_18faedbd-9c74-40b2-a544-2a6aca17af1f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoncurrentLiabilitiesTableTextBlock"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_5a71f4ee-e3de-46ab-990c-a6005e829b3f" xlink:to="loc_us-gaap_OtherNoncurrentLiabilitiesTableTextBlock_18faedbd-9c74-40b2-a544-2a6aca17af1f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataScheduleofOtherIncomeExpenseDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#OtherFinancialDataScheduleofOtherIncomeExpenseDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataScheduleofOtherIncomeExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherFinancialDataAbstract_8ac93b3b-fde7-4e0c-a301-b4781ad7ccd2" xlink:href="aon-20201231.xsd#aon_OtherFinancialDataAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_838ac80e-2f48-4ff7-8e1f-ae5656e10714" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignCurrencyTransactionGainLossBeforeTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_8ac93b3b-fde7-4e0c-a301-b4781ad7ccd2" xlink:to="loc_us-gaap_ForeignCurrencyTransactionGainLossBeforeTax_838ac80e-2f48-4ff7-8e1f-ae5656e10714" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_55e8d64d-200f-4884-94bc-c3da3bf822e8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_8ac93b3b-fde7-4e0c-a301-b4781ad7ccd2" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_55e8d64d-200f-4884-94bc-c3da3bf822e8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionExpense_ac5accf5-0ee3-43f9-931e-0748852ce463" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionExpense"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_8ac93b3b-fde7-4e0c-a301-b4781ad7ccd2" xlink:to="loc_us-gaap_PensionExpense_ac5accf5-0ee3-43f9-931e-0748852ce463" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromEquityMethodInvestments_05f69db1-2d58-4037-878e-674db20464a3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromEquityMethodInvestments"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_8ac93b3b-fde7-4e0c-a301-b4781ad7ccd2" xlink:to="loc_us-gaap_IncomeLossFromEquityMethodInvestments_05f69db1-2d58-4037-878e-674db20464a3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_827564f7-5d20-4dbf-9c78-5696a9cdbb6a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_8ac93b3b-fde7-4e0c-a301-b4781ad7ccd2" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_827564f7-5d20-4dbf-9c78-5696a9cdbb6a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_0303377a-f3a8-45eb-b41e-9cdc10a2d381" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_8ac93b3b-fde7-4e0c-a301-b4781ad7ccd2" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_0303377a-f3a8-45eb-b41e-9cdc10a2d381" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonoperatingIncomeExpense_45ecd09c-281f-4f7e-bd64-d6d5563c0022" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NonoperatingIncomeExpense"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_8ac93b3b-fde7-4e0c-a301-b4781ad7ccd2" xlink:to="loc_us-gaap_NonoperatingIncomeExpense_45ecd09c-281f-4f7e-bd64-d6d5563c0022" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataScheduleofAllowanceforDoubtfulAccountsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#OtherFinancialDataScheduleofAllowanceforDoubtfulAccountsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataScheduleofAllowanceforDoubtfulAccountsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherFinancialDataAbstract_48618292-5919-46c4-b927-11b39c7e33ff" xlink:href="aon-20201231.xsd#aon_OtherFinancialDataAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_5daef473-593e-47cd-89af-4fa05a293921" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_48618292-5919-46c4-b927-11b39c7e33ff" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_5daef473-593e-47cd-89af-4fa05a293921" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_e7482434-f34f-4f57-8ff2-6c84ddf2a6a6" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_5daef473-593e-47cd-89af-4fa05a293921" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_e7482434-f34f-4f57-8ff2-6c84ddf2a6a6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_3d810d47-e93b-47c8-851d-5e09c4b6ff7e" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_e7482434-f34f-4f57-8ff2-6c84ddf2a6a6" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_3d810d47-e93b-47c8-851d-5e09c4b6ff7e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_e42adedc-a351-472d-8476-09e1a2138dbb" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_3d810d47-e93b-47c8-851d-5e09c4b6ff7e" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_e42adedc-a351-472d-8476-09e1a2138dbb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember_66686df1-7b36-4464-9164-c49f67fea978" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_3d810d47-e93b-47c8-851d-5e09c4b6ff7e" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember_66686df1-7b36-4464-9164-c49f67fea978" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_8be83578-4c26-4ea2-a959-c6e4216bdea5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_5daef473-593e-47cd-89af-4fa05a293921" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_8be83578-4c26-4ea2-a959-c6e4216bdea5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_c9161649-a0a9-493d-ba6e-ec3c203b1ce0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_8be83578-4c26-4ea2-a959-c6e4216bdea5" xlink:to="loc_us-gaap_EquityComponentDomain_c9161649-a0a9-493d-ba6e-ec3c203b1ce0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_cdca3a4b-dd7f-4a57-a4e9-f04e3c1660c0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetainedEarningsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_c9161649-a0a9-493d-ba6e-ec3c203b1ce0" xlink:to="loc_us-gaap_RetainedEarningsMember_cdca3a4b-dd7f-4a57-a4e9-f04e3c1660c0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_944152b2-24d4-4736-8723-5786d22cc0ad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_5daef473-593e-47cd-89af-4fa05a293921" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_944152b2-24d4-4736-8723-5786d22cc0ad" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_a429e650-11e1-41e2-bf28-d36f5dd7206d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_944152b2-24d4-4736-8723-5786d22cc0ad" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_a429e650-11e1-41e2-bf28-d36f5dd7206d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_a7ba82d1-f088-4ba9-aa86-d985adc2e523" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_a429e650-11e1-41e2-bf28-d36f5dd7206d" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_a7ba82d1-f088-4ba9-aa86-d985adc2e523" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProvisionForDoubtfulAccounts_910333b4-63c4-45c7-880c-f8d51fa4de1d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ProvisionForDoubtfulAccounts"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_a429e650-11e1-41e2-bf28-d36f5dd7206d" xlink:to="loc_us-gaap_ProvisionForDoubtfulAccounts_910333b4-63c4-45c7-880c-f8d51fa4de1d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs_154e66b7-f75f-432b-a491-a9b539e11624" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_a429e650-11e1-41e2-bf28-d36f5dd7206d" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs_154e66b7-f75f-432b-a491-a9b539e11624" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther_643c52b2-a2be-448a-a751-5af20b6911bb" xlink:href="aon-20201231.xsd#aon_AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_a429e650-11e1-41e2-bf28-d36f5dd7206d" xlink:to="loc_aon_AccountsReceivableAllowanceForCreditLossForeignCurrencyTranslationAndOther_643c52b2-a2be-448a-a751-5af20b6911bb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_9a46bb9d-99c5-4cac-84e3-4d1e6aefc346" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableRollforward_a429e650-11e1-41e2-bf28-d36f5dd7206d" xlink:to="loc_us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent_9a46bb9d-99c5-4cac-84e3-4d1e6aefc346" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_288883bd-6596-4dff-91e5-bbc62fcd183b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_944152b2-24d4-4736-8723-5786d22cc0ad" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_288883bd-6596-4dff-91e5-bbc62fcd183b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataScheduleofOtherCurrentAssetsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#OtherFinancialDataScheduleofOtherCurrentAssetsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataScheduleofOtherCurrentAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherFinancialDataAbstract_f0efd479-d441-4775-8ff6-158981e511f7" xlink:href="aon-20201231.xsd#aon_OtherFinancialDataAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetCurrent_65f3110b-da87-4d01-a019-eaada22c026e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerAssetNetCurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_f0efd479-d441-4775-8ff6-158981e511f7" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetCurrent_65f3110b-da87-4d01-a019-eaada22c026e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherTaxAssetsCurrent_de44ba35-e65a-46bb-9384-5ca651428bc9" xlink:href="aon-20201231.xsd#aon_OtherTaxAssetsCurrent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_f0efd479-d441-4775-8ff6-158981e511f7" xlink:to="loc_aon_OtherTaxAssetsCurrent_de44ba35-e65a-46bb-9384-5ca651428bc9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpenseCurrent_30f1c839-0f78-4acc-a774-402d0082b2e7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PrepaidExpenseCurrent"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_f0efd479-d441-4775-8ff6-158981e511f7" xlink:to="loc_us-gaap_PrepaidExpenseCurrent_30f1c839-0f78-4acc-a774-402d0082b2e7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousCurrent_fa85a619-6933-4f89-b417-af7965490352" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsMiscellaneousCurrent"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_f0efd479-d441-4775-8ff6-158981e511f7" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousCurrent_fa85a619-6933-4f89-b417-af7965490352" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_979bc0d2-a396-4cc6-8c87-761b1086598a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_f0efd479-d441-4775-8ff6-158981e511f7" xlink:to="loc_us-gaap_OtherAssetsCurrent_979bc0d2-a396-4cc6-8c87-761b1086598a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet_e7b9f881-6ab6-450f-80e0-d2831ca13124" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_f0efd479-d441-4775-8ff6-158981e511f7" xlink:to="loc_us-gaap_DisposalGroupIncludingDiscontinuedOperationAccountsNotesAndLoansReceivableNet_e7b9f881-6ab6-450f-80e0-d2831ca13124" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataComponentsofFixedAssetsNetDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#OtherFinancialDataComponentsofFixedAssetsNetDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataComponentsofFixedAssetsNetDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherFinancialDataAbstract_d1734c3c-50a2-4ec8-ae90-1ada0f9826be" xlink:href="aon-20201231.xsd#aon_OtherFinancialDataAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_0b09ba17-06d1-4245-a056-2dd5db1233fb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_d1734c3c-50a2-4ec8-ae90-1ada0f9826be" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_0b09ba17-06d1-4245-a056-2dd5db1233fb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_3fdce7fa-abc5-4fe6-927a-4c98f3fdea89" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_0b09ba17-06d1-4245-a056-2dd5db1233fb" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_3fdce7fa-abc5-4fe6-927a-4c98f3fdea89" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0e0aaf9f-6b03-4004-a965-eabfe6270674" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_3fdce7fa-abc5-4fe6-927a-4c98f3fdea89" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0e0aaf9f-6b03-4004-a965-eabfe6270674" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_c6953f23-4c01-4d60-87ee-cfea20401272" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComputerSoftwareIntangibleAssetMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0e0aaf9f-6b03-4004-a965-eabfe6270674" xlink:to="loc_us-gaap_ComputerSoftwareIntangibleAssetMember_c6953f23-4c01-4d60-87ee-cfea20401272" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseholdImprovementsMember_a5f26258-24d5-44fb-9865-6142e9967216" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseholdImprovementsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0e0aaf9f-6b03-4004-a965-eabfe6270674" xlink:to="loc_us-gaap_LeaseholdImprovementsMember_a5f26258-24d5-44fb-9865-6142e9967216" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComputerEquipmentMember_e0aec1ff-7b65-4ce8-804c-2c45cabc4b88" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComputerEquipmentMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0e0aaf9f-6b03-4004-a965-eabfe6270674" xlink:to="loc_us-gaap_ComputerEquipmentMember_e0aec1ff-7b65-4ce8-804c-2c45cabc4b88" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FurnitureFixturesAndEquipmentMember_d3103b5d-add2-4f2d-b654-2f532cc5aed1" xlink:href="aon-20201231.xsd#aon_FurnitureFixturesAndEquipmentMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0e0aaf9f-6b03-4004-a965-eabfe6270674" xlink:to="loc_aon_FurnitureFixturesAndEquipmentMember_d3103b5d-add2-4f2d-b654-2f532cc5aed1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_b67262f1-c097-4292-81ea-645dfe46fb20" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0e0aaf9f-6b03-4004-a965-eabfe6270674" xlink:to="loc_us-gaap_ConstructionInProgressMember_b67262f1-c097-4292-81ea-645dfe46fb20" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_5f78195b-ed8c-4b83-aa96-5fe3c1d2bbcc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentOtherTypesMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_0e0aaf9f-6b03-4004-a965-eabfe6270674" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentOtherTypesMember_5f78195b-ed8c-4b83-aa96-5fe3c1d2bbcc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_9b6d26c8-e0b6-4480-9e87-66317dbc3ff3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_0b09ba17-06d1-4245-a056-2dd5db1233fb" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentLineItems_9b6d26c8-e0b6-4480-9e87-66317dbc3ff3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_f843006c-047e-4bc2-80ba-67d584080189" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_9b6d26c8-e0b6-4480-9e87-66317dbc3ff3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_f843006c-047e-4bc2-80ba-67d584080189" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_53b5bbf9-d46d-4ca6-b3e2-97ca44ab4268" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_9b6d26c8-e0b6-4480-9e87-66317dbc3ff3" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_53b5bbf9-d46d-4ca6-b3e2-97ca44ab4268" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_942fb09b-da19-409e-a250-fc6682496ab8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_9b6d26c8-e0b6-4480-9e87-66317dbc3ff3" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_942fb09b-da19-409e-a250-fc6682496ab8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Depreciation_c18c3323-d7c6-43b2-8853-a292b50cf118" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Depreciation"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_9b6d26c8-e0b6-4480-9e87-66317dbc3ff3" xlink:to="loc_us-gaap_Depreciation_c18c3323-d7c6-43b2-8853-a292b50cf118" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataScheduleofOtherNoncurrentAssetsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#OtherFinancialDataScheduleofOtherNoncurrentAssetsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataScheduleofOtherNoncurrentAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherFinancialDataAbstract_dd843779-92a4-427e-89a7-7ec7e575bf87" xlink:href="aon-20201231.xsd#aon_OtherFinancialDataAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_099c3fb6-fd0d-4ae7-adf8-d2d79527fd2c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerAssetNetNoncurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_dd843779-92a4-427e-89a7-7ec7e575bf87" xlink:to="loc_us-gaap_ContractWithCustomerAssetNetNoncurrent_099c3fb6-fd0d-4ae7-adf8-d2d79527fd2c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermInvestments_23353eba-7749-4b1e-a057-93e38c521154" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermInvestments"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_dd843779-92a4-427e-89a7-7ec7e575bf87" xlink:to="loc_us-gaap_LongTermInvestments_23353eba-7749-4b1e-a057-93e38c521154" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_821b4647-9164-4b56-b6c5-0183c5a1c5f2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_dd843779-92a4-427e-89a7-7ec7e575bf87" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_821b4647-9164-4b56-b6c5-0183c5a1c5f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxesReceivableNoncurrent_432222d2-ccd3-406c-a182-37bd63f0b481" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxesReceivableNoncurrent"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_dd843779-92a4-427e-89a7-7ec7e575bf87" xlink:to="loc_us-gaap_IncomeTaxesReceivableNoncurrent_432222d2-ccd3-406c-a182-37bd63f0b481" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_605cf371-1d82-4bea-ac34-e119e3f8b06d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsMiscellaneousNoncurrent"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_dd843779-92a4-427e-89a7-7ec7e575bf87" xlink:to="loc_us-gaap_OtherAssetsMiscellaneousNoncurrent_605cf371-1d82-4bea-ac34-e119e3f8b06d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_1610989b-16d9-4857-b04e-cb9904fc958c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_dd843779-92a4-427e-89a7-7ec7e575bf87" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_1610989b-16d9-4857-b04e-cb9904fc958c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataScheduleofOtherCurrentLiabilitiesDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#OtherFinancialDataScheduleofOtherCurrentLiabilitiesDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataScheduleofOtherCurrentLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherFinancialDataAbstract_dbfbf043-b5cf-4341-ae7a-1738b81a9366" xlink:href="aon-20201231.xsd#aon_OtherFinancialDataAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityCurrent_05daa9fc-871c-4c2d-80b8-190e86f5976b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityCurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_dbfbf043-b5cf-4341-ae7a-1738b81a9366" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityCurrent_05daa9fc-871c-4c2d-80b8-190e86f5976b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_5f6c6fa2-508d-4b8f-ae3f-48dc5f61759a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedIncomeTaxesCurrent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_dbfbf043-b5cf-4341-ae7a-1738b81a9366" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_5f6c6fa2-508d-4b8f-ae3f-48dc5f61759a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_OperatingLeaseAndFinanceLeaseLiabilityCurrent_b599d2bc-e852-40ac-b2e1-bb957cd7ce02" xlink:href="aon-20201231.xsd#aon_OperatingLeaseAndFinanceLeaseLiabilityCurrent"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_dbfbf043-b5cf-4341-ae7a-1738b81a9366" xlink:to="loc_aon_OperatingLeaseAndFinanceLeaseLiabilityCurrent_b599d2bc-e852-40ac-b2e1-bb957cd7ce02" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesCurrent_dc6665f1-97e6-44cc-ae6f-5690dd5b8ef3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAccruedLiabilitiesCurrent"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_dbfbf043-b5cf-4341-ae7a-1738b81a9366" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesCurrent_dc6665f1-97e6-44cc-ae6f-5690dd5b8ef3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesCurrent_4fcfa84c-d4b7-4869-8cbc-db87af83bcd3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesCurrent"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_dbfbf043-b5cf-4341-ae7a-1738b81a9366" xlink:to="loc_us-gaap_OtherLiabilitiesCurrent_4fcfa84c-d4b7-4869-8cbc-db87af83bcd3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ContractWithCustomerLiabilityIncludingNewContractRevenueRecognized_55a8e9bb-6050-4209-8ba5-a66ae7755364" xlink:href="aon-20201231.xsd#aon_ContractWithCustomerLiabilityIncludingNewContractRevenueRecognized"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_dbfbf043-b5cf-4341-ae7a-1738b81a9366" xlink:to="loc_aon_ContractWithCustomerLiabilityIncludingNewContractRevenueRecognized_55a8e9bb-6050-4209-8ba5-a66ae7755364" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/OtherFinancialDataScheduleofOtherNoncurrentLiabilitiesDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#OtherFinancialDataScheduleofOtherNoncurrentLiabilitiesDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/OtherFinancialDataScheduleofOtherNoncurrentLiabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherFinancialDataAbstract_a817b745-954d-48cb-992d-8933cadf18e7" xlink:href="aon-20201231.xsd#aon_OtherFinancialDataAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedIncomeTaxesNoncurrent_eb9fa83e-b1ea-4482-b679-047f8e14ba6f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccruedIncomeTaxesNoncurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_a817b745-954d-48cb-992d-8933cadf18e7" xlink:to="loc_us-gaap_AccruedIncomeTaxesNoncurrent_eb9fa83e-b1ea-4482-b679-047f8e14ba6f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_daf16f2f-81b2-4e34-89fd-09e399db2401" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_a817b745-954d-48cb-992d-8933cadf18e7" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_daf16f2f-81b2-4e34-89fd-09e399db2401" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_EmployeerelatedLiabilitiesNoncurrent_0b9c62d3-07c9-498e-b1ac-06094573667d" xlink:href="aon-20201231.xsd#aon_EmployeerelatedLiabilitiesNoncurrent"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_a817b745-954d-48cb-992d-8933cadf18e7" xlink:to="loc_aon_EmployeerelatedLiabilitiesNoncurrent_0b9c62d3-07c9-498e-b1ac-06094573667d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_647eab30-f2b7-422a-be26-2208295361d5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ContractWithCustomerLiabilityNoncurrent"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_a817b745-954d-48cb-992d-8933cadf18e7" xlink:to="loc_us-gaap_ContractWithCustomerLiabilityNoncurrent_647eab30-f2b7-422a-be26-2208295361d5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAccruedLiabilitiesNoncurrent_50f484ec-5f81-4550-bd56-b4a49a1be650" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherAccruedLiabilitiesNoncurrent"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_a817b745-954d-48cb-992d-8933cadf18e7" xlink:to="loc_us-gaap_OtherAccruedLiabilitiesNoncurrent_50f484ec-5f81-4550-bd56-b4a49a1be650" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_2c2ed563-e341-46c4-add7-6faa77ed56d8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_a817b745-954d-48cb-992d-8933cadf18e7" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_2c2ed563-e341-46c4-add7-6faa77ed56d8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiabilityNoncurrent_3e7df44b-b1e3-41e4-a451-32aafa8359ec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiabilityNoncurrent"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OtherFinancialDataAbstract_a817b745-954d-48cb-992d-8933cadf18e7" xlink:to="loc_us-gaap_TaxCutsAndJobsActOf2017TransitionTaxForAccumulatedForeignEarningsLiabilityNoncurrent_3e7df44b-b1e3-41e4-a451-32aafa8359ec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/Restructuring" xlink:type="simple" xlink:href="aon-20201231.xsd#Restructuring"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/Restructuring" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_98465469-d78a-429b-a69b-009fa4776268" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringAndRelatedActivitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_115fe179-687d-429c-a707-de053208ba12" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_98465469-d78a-429b-a69b-009fa4776268" xlink:to="loc_us-gaap_RestructuringAndRelatedActivitiesDisclosureTextBlock_115fe179-687d-429c-a707-de053208ba12" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/RestructuringDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#RestructuringDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/RestructuringDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_fbbf20b1-a060-430f-877e-083591b42775" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringAndRelatedActivitiesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_0f71060f-7183-45c0-b82b-fdd9de5f29d3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringCharges"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_fbbf20b1-a060-430f-877e-083591b42775" xlink:to="loc_us-gaap_RestructuringCharges_0f71060f-7183-45c0-b82b-fdd9de5f29d3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_4e7b9767-3466-41eb-afbf-7b1d04fa1ab5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringReserve"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_fbbf20b1-a060-430f-877e-083591b42775" xlink:to="loc_us-gaap_RestructuringReserve_4e7b9767-3466-41eb-afbf-7b1d04fa1ab5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_5f07b3bb-aa13-4189-98d2-a90f215cabf8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_fbbf20b1-a060-430f-877e-083591b42775" xlink:to="loc_us-gaap_PaymentsForRestructuring_5f07b3bb-aa13-4189-98d2-a90f215cabf8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveTranslationAdjustment_9676a054-337e-455d-a708-fe60dbacd1eb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestructuringReserveTranslationAdjustment"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RestructuringAndRelatedActivitiesAbstract_fbbf20b1-a060-430f-877e-083591b42775" xlink:to="loc_us-gaap_RestructuringReserveTranslationAdjustment_9676a054-337e-455d-a708-fe60dbacd1eb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/AcquisitionsandDispositionsofBusinesses" xlink:type="simple" xlink:href="aon-20201231.xsd#AcquisitionsandDispositionsofBusinesses"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/AcquisitionsandDispositionsofBusinesses" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_5d357f40-bd55-45f4-b1e0-2787803505d8" xlink:href="aon-20201231.xsd#aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock_98f21e5c-7b7e-4ac5-8588-e360262801d2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_5d357f40-bd55-45f4-b1e0-2787803505d8" xlink:to="loc_us-gaap_MergersAcquisitionsAndDispositionsDisclosuresTextBlock_98f21e5c-7b7e-4ac5-8588-e360262801d2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/AcquisitionsandDispositionsofBusinessesTables" xlink:type="simple" xlink:href="aon-20201231.xsd#AcquisitionsandDispositionsofBusinessesTables"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/AcquisitionsandDispositionsofBusinessesTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_88e8e126-414d-4193-b207-7de7bfed59cf" xlink:href="aon-20201231.xsd#aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_ccaed37a-8ed3-4ef5-8569-e598026845b2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_88e8e126-414d-4193-b207-7de7bfed59cf" xlink:to="loc_us-gaap_ScheduleOfRecognizedIdentifiedAssetsAcquiredAndLiabilitiesAssumedTableTextBlock_ccaed37a-8ed3-4ef5-8569-e598026845b2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/AcquisitionsandDispositionsofBusinessesCompletedAcquisitionsNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#AcquisitionsandDispositionsofBusinessesCompletedAcquisitionsNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/AcquisitionsandDispositionsofBusinessesCompletedAcquisitionsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_aa23744b-fbf1-4cb9-b050-887b53acdae0" xlink:href="aon-20201231.xsd#aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_451a15ac-ba80-450b-a02c-473d2a3dc2cb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_aa23744b-fbf1-4cb9-b050-887b53acdae0" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_451a15ac-ba80-450b-a02c-473d2a3dc2cb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_23a698e0-fb45-404c-82b5-33b66361f65d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_451a15ac-ba80-450b-a02c-473d2a3dc2cb" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_23a698e0-fb45-404c-82b5-33b66361f65d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_0456176a-47b6-47d0-9839-03d0d10d5c53" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_23a698e0-fb45-404c-82b5-33b66361f65d" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_0456176a-47b6-47d0-9839-03d0d10d5c53" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherGeneralExpensesMember_87941c7b-fd8c-43dc-937d-107761abd4f9" xlink:href="aon-20201231.xsd#aon_OtherGeneralExpensesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_0456176a-47b6-47d0-9839-03d0d10d5c53" xlink:to="loc_aon_OtherGeneralExpensesMember_87941c7b-fd8c-43dc-937d-107761abd4f9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_12ce4c9f-027f-4666-b896-492b7dbe4fdd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_451a15ac-ba80-450b-a02c-473d2a3dc2cb" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_12ce4c9f-027f-4666-b896-492b7dbe4fdd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_caece48a-5847-4f97-b64a-975b9f42ad56" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_12ce4c9f-027f-4666-b896-492b7dbe4fdd" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_caece48a-5847-4f97-b64a-975b9f42ad56" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FarmingtonAdministrativeServicesLLCMember_e36cc768-fe20-4ecb-95ee-dc2f41951f46" xlink:href="aon-20201231.xsd#aon_FarmingtonAdministrativeServicesLLCMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_caece48a-5847-4f97-b64a-975b9f42ad56" xlink:to="loc_aon_FarmingtonAdministrativeServicesLLCMember_e36cc768-fe20-4ecb-95ee-dc2f41951f46" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CytelligenceIncMember_88df75c2-aded-427c-b0fa-83bc74f27b34" xlink:href="aon-20201231.xsd#aon_CytelligenceIncMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_caece48a-5847-4f97-b64a-975b9f42ad56" xlink:to="loc_aon_CytelligenceIncMember_88df75c2-aded-427c-b0fa-83bc74f27b34" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CoverWalletIncMember_4758b303-0a68-44b5-9669-f9d0650253ce" xlink:href="aon-20201231.xsd#aon_CoverWalletIncMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_caece48a-5847-4f97-b64a-975b9f42ad56" xlink:to="loc_aon_CoverWalletIncMember_4758b303-0a68-44b5-9669-f9d0650253ce" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TRIUMGmbHInsuranceBrokerMember_8c692ec1-9912-4c9b-843c-d957c57c1251" xlink:href="aon-20201231.xsd#aon_TRIUMGmbHInsuranceBrokerMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_caece48a-5847-4f97-b64a-975b9f42ad56" xlink:to="loc_aon_TRIUMGmbHInsuranceBrokerMember_8c692ec1-9912-4c9b-843c-d957c57c1251" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_AssimediaSAMember_d2528300-0114-4f40-a9a1-0d5cf41873bf" xlink:href="aon-20201231.xsd#aon_AssimediaSAMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_caece48a-5847-4f97-b64a-975b9f42ad56" xlink:to="loc_aon_AssimediaSAMember_d2528300-0114-4f40-a9a1-0d5cf41873bf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ApolloConseiletCourtageMember_afb8062d-8726-4b21-a8dd-f179ed18fb6c" xlink:href="aon-20201231.xsd#aon_ApolloConseiletCourtageMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_caece48a-5847-4f97-b64a-975b9f42ad56" xlink:to="loc_aon_ApolloConseiletCourtageMember_afb8062d-8726-4b21-a8dd-f179ed18fb6c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_a916a7e0-e77d-488d-9e60-eed159868e31" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_451a15ac-ba80-450b-a02c-473d2a3dc2cb" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_a916a7e0-e77d-488d-9e60-eed159868e31" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfBusinessesAcquired_e895628c-9153-4c36-a4e2-8c609211450b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfBusinessesAcquired"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a916a7e0-e77d-488d-9e60-eed159868e31" xlink:to="loc_us-gaap_NumberOfBusinessesAcquired_e895628c-9153-4c36-a4e2-8c609211450b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_9a4870e0-6e85-4865-8e11-fd0f7a745fe0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a916a7e0-e77d-488d-9e60-eed159868e31" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife_9a4870e0-6e85-4865-8e11-fd0f7a745fe0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_28161a43-394a-41cf-8235-6de4dd448dd9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationAcquisitionRelatedCosts"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a916a7e0-e77d-488d-9e60-eed159868e31" xlink:to="loc_us-gaap_BusinessCombinationAcquisitionRelatedCosts_28161a43-394a-41cf-8235-6de4dd448dd9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_ed494255-218d-4e0c-b72c-afd8656af43a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a916a7e0-e77d-488d-9e60-eed159868e31" xlink:to="loc_us-gaap_BusinessCombinationProFormaInformationRevenueOfAcquireeSinceAcquisitionDateActual_ed494255-218d-4e0c-b72c-afd8656af43a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_8997d31a-83de-4adf-8be4-f3c6623c8e18" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_a916a7e0-e77d-488d-9e60-eed159868e31" xlink:to="loc_us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired_8997d31a-83de-4adf-8be4-f3c6623c8e18" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/AcquisitionsandDispositionsofBusinessesScheduleofNetAssetsAcquiredDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#AcquisitionsandDispositionsofBusinessesScheduleofNetAssetsAcquiredDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/AcquisitionsandDispositionsofBusinessesScheduleofNetAssetsAcquiredDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_7e6431d5-56cb-4269-bc5a-6dae202470da" xlink:href="aon-20201231.xsd#aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3daf4dcd-af40-40c6-bb69-5220c1754921" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_7e6431d5-56cb-4269-bc5a-6dae202470da" xlink:to="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3daf4dcd-af40-40c6-bb69-5220c1754921" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAxis_75766697-7055-4a86-a13b-646e6f2490a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3daf4dcd-af40-40c6-bb69-5220c1754921" xlink:to="loc_us-gaap_BusinessAcquisitionAxis_75766697-7055-4a86-a13b-646e6f2490a9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f8eed774-c740-4839-8c83-7ac94349cc67" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionAcquireeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAxis_75766697-7055-4a86-a13b-646e6f2490a9" xlink:to="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f8eed774-c740-4839-8c83-7ac94349cc67" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_A2019And2020AcquisitionsMember_6b7e2a7a-63bd-466e-9e7c-6d03dd28a195" xlink:href="aon-20201231.xsd#aon_A2019And2020AcquisitionsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionAcquireeDomain_f8eed774-c740-4839-8c83-7ac94349cc67" xlink:to="loc_aon_A2019And2020AcquisitionsMember_6b7e2a7a-63bd-466e-9e7c-6d03dd28a195" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessAcquisitionLineItems_eaeee32a-9937-4499-9b53-73b8b89669da" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessAcquisitionLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfBusinessAcquisitionsByAcquisitionTable_3daf4dcd-af40-40c6-bb69-5220c1754921" xlink:to="loc_us-gaap_BusinessAcquisitionLineItems_eaeee32a-9937-4499-9b53-73b8b89669da" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_af234182-20b3-4de6-8129-6d77e038ce67" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_eaeee32a-9937-4499-9b53-73b8b89669da" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_af234182-20b3-4de6-8129-6d77e038ce67" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireBusinessesGross_ef7d25c2-3516-4e97-8bf7-2ebf9815d16e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsToAcquireBusinessesGross"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_af234182-20b3-4de6-8129-6d77e038ce67" xlink:to="loc_us-gaap_PaymentsToAcquireBusinessesGross_ef7d25c2-3516-4e97-8bf7-2ebf9815d16e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_2817b599-d11e-42bf-bf2d-68679c365261" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_af234182-20b3-4de6-8129-6d77e038ce67" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferredLiabilitiesIncurred_2817b599-d11e-42bf-bf2d-68679c365261" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationConsiderationTransferred1_6892ea71-90c9-4596-8be9-8ee758ddaa10" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationConsiderationTransferred1"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationConsiderationTransferredAbstract_af234182-20b3-4de6-8129-6d77e038ce67" xlink:to="loc_us-gaap_BusinessCombinationConsiderationTransferred1_6892ea71-90c9-4596-8be9-8ee758ddaa10" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_7f6b9e70-262a-4744-9c94-00554953b1f6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_eaeee32a-9937-4499-9b53-73b8b89669da" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_7f6b9e70-262a-4744-9c94-00554953b1f6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_fa5be821-8107-45e3-afcb-fcd36ee475b7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_7f6b9e70-262a-4744-9c94-00554953b1f6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCashAndEquivalents_fa5be821-8107-45e3-afcb-fcd36ee475b7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_cac9694e-50ac-4416-874a-e150a9779f99" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_7f6b9e70-262a-4744-9c94-00554953b1f6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsReceivables_cac9694e-50ac-4416-874a-e150a9779f99" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_56e16b82-0ff5-4314-a5d7-635b2fdc77a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_7f6b9e70-262a-4744-9c94-00554953b1f6" xlink:to="loc_us-gaap_Goodwill_56e16b82-0ff5-4314-a5d7-635b2fdc77a9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_cfd17a11-867c-414d-96c5-6f37a8fdf02a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_7f6b9e70-262a-4744-9c94-00554953b1f6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibleAssetsOtherThanGoodwill_cfd17a11-867c-414d-96c5-6f37a8fdf02a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_fd85754f-61e1-4963-9994-1da6c1c9ec5a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_7f6b9e70-262a-4744-9c94-00554953b1f6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssetsOther_fd85754f-61e1-4963-9994-1da6c1c9ec5a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_5c037306-21f5-4531-909b-89c3830903b7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_7f6b9e70-262a-4744-9c94-00554953b1f6" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets_5c037306-21f5-4531-909b-89c3830903b7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill_7809b239-372e-452a-9dd7-b0133c9d6d2c" xlink:href="aon-20201231.xsd#aon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAbstract_7f6b9e70-262a-4744-9c94-00554953b1f6" xlink:to="loc_aon_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssetsAcquiredIncludingGoodwill_7809b239-372e-452a-9dd7-b0133c9d6d2c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_436e54d9-c9c7-4ef0-a3f8-c2ae97348aaf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_eaeee32a-9937-4499-9b53-73b8b89669da" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_436e54d9-c9c7-4ef0-a3f8-c2ae97348aaf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_7f8cda00-4e9d-4f64-8919-52fe5d92968b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_436e54d9-c9c7-4ef0-a3f8-c2ae97348aaf" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities_7f8cda00-4e9d-4f64-8919-52fe5d92968b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities_a05ed240-d308-4993-9901-124202bb22f9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_436e54d9-c9c7-4ef0-a3f8-c2ae97348aaf" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilities_a05ed240-d308-4993-9901-124202bb22f9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_609d7ba2-7a30-43cf-bacf-ea0d359595cb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilitiesAbstract_436e54d9-c9c7-4ef0-a3f8-c2ae97348aaf" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedLiabilities_609d7ba2-7a30-43cf-bacf-ea0d359595cb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_a23855a0-36d2-4da2-8a56-57c92dcc2cd3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BusinessAcquisitionLineItems_eaeee32a-9937-4499-9b53-73b8b89669da" xlink:to="loc_us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet_a23855a0-36d2-4da2-8a56-57c92dcc2cd3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/AcquisitionsandDispositionsofBusinessesCompletedDispositionsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#AcquisitionsandDispositionsofBusinessesCompletedDispositionsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/AcquisitionsandDispositionsofBusinessesCompletedDispositionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_11eb7c0a-cf45-4b0b-8953-bfd42f82a003" xlink:href="aon-20201231.xsd#aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract_896b6894-e632-432b-a2f3-ccd6a1a5d591" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_BusinessCombinationsandDiscontinuedOperationsandDisposalGroupsAbstract_11eb7c0a-cf45-4b0b-8953-bfd42f82a003" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract_896b6894-e632-432b-a2f3-ccd6a1a5d591" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_93971889-6e4c-4635-95a3-8820f0ef1d59" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupNotDiscontinuedOperationIncomeStatementDisclosuresAbstract_896b6894-e632-432b-a2f3-ccd6a1a5d591" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_93971889-6e4c-4635-95a3-8820f0ef1d59" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_0cf0fdf4-67dc-4aee-a14f-4669ae1aaf31" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_93971889-6e4c-4635-95a3-8820f0ef1d59" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_0cf0fdf4-67dc-4aee-a14f-4669ae1aaf31" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_51e5f657-a2ec-46bd-a680-6ff8d1add6a6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_0cf0fdf4-67dc-4aee-a14f-4669ae1aaf31" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_51e5f657-a2ec-46bd-a680-6ff8d1add6a6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_AmortizationAndImpairmentOfIntangibleAssetsMember_a326223e-c716-44a5-8ef9-7604ee3087f9" xlink:href="aon-20201231.xsd#aon_AmortizationAndImpairmentOfIntangibleAssetsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_51e5f657-a2ec-46bd-a680-6ff8d1add6a6" xlink:to="loc_aon_AmortizationAndImpairmentOfIntangibleAssetsMember_a326223e-c716-44a5-8ef9-7604ee3087f9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_5af7f4f9-f3fa-45a1-9140-67bfb6dca19f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_93971889-6e4c-4635-95a3-8820f0ef1d59" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_5af7f4f9-f3fa-45a1-9140-67bfb6dca19f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_2f6d9dd1-b051-4297-9f7d-06f8c62b3e88" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_5af7f4f9-f3fa-45a1-9140-67bfb6dca19f" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_2f6d9dd1-b051-4297-9f7d-06f8c62b3e88" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationsMember_93f199a2-0d46-4bef-908d-34b650466286" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_2f6d9dd1-b051-4297-9f7d-06f8c62b3e88" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationsMember_93f199a2-0d46-4bef-908d-34b650466286" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_e2319893-a7ff-4c63-ae37-6e46f7fbf8e6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_2f6d9dd1-b051-4297-9f7d-06f8c62b3e88" xlink:to="loc_us-gaap_DisposalGroupHeldforsaleNotDiscontinuedOperationsMember_e2319893-a7ff-4c63-ae37-6e46f7fbf8e6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7b3eddcd-384f-49f1-a473-3d81c8f4cc66" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsTable_93971889-6e4c-4635-95a3-8820f0ef1d59" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7b3eddcd-384f-49f1-a473-3d81c8f4cc66" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_NumberOfDispositions_da860239-fbf8-46c8-93b6-eccd61893a85" xlink:href="aon-20201231.xsd#aon_NumberOfDispositions"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7b3eddcd-384f-49f1-a473-3d81c8f4cc66" xlink:to="loc_aon_NumberOfDispositions_da860239-fbf8-46c8-93b6-eccd61893a85" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_613ff75a-f274-4daa-a513-88b207b6f5fe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7b3eddcd-384f-49f1-a473-3d81c8f4cc66" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationGainLossOnDisposal_613ff75a-f274-4daa-a513-88b207b6f5fe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_580d9a2b-b1dd-41d7-aed1-17c44e937f85" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsLineItems_7b3eddcd-384f-49f1-a473-3d81c8f4cc66" xlink:to="loc_us-gaap_DisposalGroupNotDiscontinuedOperationLossGainOnWriteDown_580d9a2b-b1dd-41d7-aed1-17c44e937f85" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/GoodwillandOtherIntangibleAssets" xlink:type="simple" xlink:href="aon-20201231.xsd#GoodwillandOtherIntangibleAssets"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/GoodwillandOtherIntangibleAssets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_56044cd5-72ff-47ed-a4cd-95f4978fb2ab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_e3bdd924-f1c2-462e-9c37-58c9d7088bba" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_56044cd5-72ff-47ed-a4cd-95f4978fb2ab" xlink:to="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureTextBlock_e3bdd924-f1c2-462e-9c37-58c9d7088bba" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/GoodwillandOtherIntangibleAssetsTables" xlink:type="simple" xlink:href="aon-20201231.xsd#GoodwillandOtherIntangibleAssetsTables"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/GoodwillandOtherIntangibleAssetsTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_34a434ce-8473-4e71-beef-ac870fe8a1f9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGoodwillTextBlock_cad3be1c-ba76-4143-b43e-0f3005630fef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfGoodwillTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_34a434ce-8473-4e71-beef-ac870fe8a1f9" xlink:to="loc_us-gaap_ScheduleOfGoodwillTextBlock_cad3be1c-ba76-4143-b43e-0f3005630fef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_f3a5106c-8fa7-4510-9026-71010a9a8ae3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_34a434ce-8473-4e71-beef-ac870fe8a1f9" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTableTextBlock_f3a5106c-8fa7-4510-9026-71010a9a8ae3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_6265d40b-8768-4db9-bf3c-94dc8864a9b3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_34a434ce-8473-4e71-beef-ac870fe8a1f9" xlink:to="loc_us-gaap_ScheduleofFiniteLivedIntangibleAssetsFutureAmortizationExpenseTableTextBlock_6265d40b-8768-4db9-bf3c-94dc8864a9b3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/GoodwillandOtherIntangibleAssetsScheduleofchangesinthenetcarryingamountofgoodwillDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#GoodwillandOtherIntangibleAssetsScheduleofchangesinthenetcarryingamountofgoodwillDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/GoodwillandOtherIntangibleAssetsScheduleofchangesinthenetcarryingamountofgoodwillDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_098a0293-2114-4854-b5e1-98d6dddf2080" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_5f461136-093b-4e06-910d-ebffc0d8da3b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_098a0293-2114-4854-b5e1-98d6dddf2080" xlink:to="loc_us-gaap_GoodwillRollForward_5f461136-093b-4e06-910d-ebffc0d8da3b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_ca1a6ae7-14db-4236-a4c0-2470e8279f5c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_5f461136-093b-4e06-910d-ebffc0d8da3b" xlink:to="loc_us-gaap_Goodwill_ca1a6ae7-14db-4236-a4c0-2470e8279f5c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAcquiredDuringPeriod_410d507a-03b3-4b56-b31c-5758e14e73d9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAcquiredDuringPeriod"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_5f461136-093b-4e06-910d-ebffc0d8da3b" xlink:to="loc_us-gaap_GoodwillAcquiredDuringPeriod_410d507a-03b3-4b56-b31c-5758e14e73d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_1a890c2c-2ddd-4233-927f-dc4386f1edaa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_5f461136-093b-4e06-910d-ebffc0d8da3b" xlink:to="loc_us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit_1a890c2c-2ddd-4233-927f-dc4386f1edaa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_210325a7-9772-4e74-879d-94274b1f2ae8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillPurchaseAccountingAdjustments"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_5f461136-093b-4e06-910d-ebffc0d8da3b" xlink:to="loc_us-gaap_GoodwillPurchaseAccountingAdjustments_210325a7-9772-4e74-879d-94274b1f2ae8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_5a1d3379-9498-4786-a95e-44e6ebf48060" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_5f461136-093b-4e06-910d-ebffc0d8da3b" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_5a1d3379-9498-4786-a95e-44e6ebf48060" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_8efc720f-f845-4913-9b2b-0a3e07fc1b75" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Goodwill"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillRollForward_5f461136-093b-4e06-910d-ebffc0d8da3b" xlink:to="loc_us-gaap_Goodwill_8efc720f-f845-4913-9b2b-0a3e07fc1b75" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/GoodwillandOtherIntangibleAssetsScheduleofotherintangibleassetsbyassetclassDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#GoodwillandOtherIntangibleAssetsScheduleofotherintangibleassetsbyassetclassDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/GoodwillandOtherIntangibleAssetsScheduleofotherintangibleassetsbyassetclassDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_95d09318-ed30-41e9-ac74-42a098ea6210" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f4f59b76-8eb2-4184-9b42-d97e660aeca6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_95d09318-ed30-41e9-ac74-42a098ea6210" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f4f59b76-8eb2-4184-9b42-d97e660aeca6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b8f704be-09de-4500-b80c-96391f564006" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f4f59b76-8eb2-4184-9b42-d97e660aeca6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b8f704be-09de-4500-b80c-96391f564006" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6b01eb81-6c0e-4923-b42c-c023f5e72a99" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_b8f704be-09de-4500-b80c-96391f564006" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6b01eb81-6c0e-4923-b42c-c023f5e72a99" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CustomerRelatedAndContractBasedMember_d35f65ff-4897-4ee5-8693-1ba8fb67f7aa" xlink:href="aon-20201231.xsd#aon_CustomerRelatedAndContractBasedMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6b01eb81-6c0e-4923-b42c-c023f5e72a99" xlink:to="loc_aon_CustomerRelatedAndContractBasedMember_d35f65ff-4897-4ee5-8693-1ba8fb67f7aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TradeNamesMember_207b1308-997e-42d8-a0dd-fb8d5ab0ce7c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TradeNamesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6b01eb81-6c0e-4923-b42c-c023f5e72a99" xlink:to="loc_us-gaap_TradeNamesMember_207b1308-997e-42d8-a0dd-fb8d5ab0ce7c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_MarketingTechnologyAndOtherMember_aa0ea4c3-7ba7-4ad8-942a-c6f2136c2e45" xlink:href="aon-20201231.xsd#aon_MarketingTechnologyAndOtherMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_6b01eb81-6c0e-4923-b42c-c023f5e72a99" xlink:to="loc_aon_MarketingTechnologyAndOtherMember_aa0ea4c3-7ba7-4ad8-942a-c6f2136c2e45" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_49f657ed-e840-4e6d-823b-0a4e87f4b952" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_f4f59b76-8eb2-4184-9b42-d97e660aeca6" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_49f657ed-e840-4e6d-823b-0a4e87f4b952" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_499669d1-37b7-43c6-90d3-f6d1571ec57b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_49f657ed-e840-4e6d-823b-0a4e87f4b952" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_499669d1-37b7-43c6-90d3-f6d1571ec57b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_69f235cf-545a-4ce0-b922-e35076c09837" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_49f657ed-e840-4e6d-823b-0a4e87f4b952" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_69f235cf-545a-4ce0-b922-e35076c09837" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_cb22e437-5f10-4450-bf64-29bced2e21f8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_49f657ed-e840-4e6d-823b-0a4e87f4b952" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_cb22e437-5f10-4450-bf64-29bced2e21f8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_aef5193d-1756-4e43-8bcb-7d0ba56fd7b8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ImpairmentOfIntangibleAssetsFinitelived"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_49f657ed-e840-4e6d-823b-0a4e87f4b952" xlink:to="loc_us-gaap_ImpairmentOfIntangibleAssetsFinitelived_aef5193d-1756-4e43-8bcb-7d0ba56fd7b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_AmortizationAndImpairmentOfIntangibleAssets_66300a1a-5895-4e62-9b18-7b082c3b9e12" xlink:href="aon-20201231.xsd#aon_AmortizationAndImpairmentOfIntangibleAssets"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_49f657ed-e840-4e6d-823b-0a4e87f4b952" xlink:to="loc_aon_AmortizationAndImpairmentOfIntangibleAssets_66300a1a-5895-4e62-9b18-7b082c3b9e12" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/GoodwillandOtherIntangibleAssetsScheduleofestimatedfutureamortizationexpenseonintangibleassetsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#GoodwillandOtherIntangibleAssetsScheduleofestimatedfutureamortizationexpenseonintangibleassetsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/GoodwillandOtherIntangibleAssetsScheduleofestimatedfutureamortizationexpenseonintangibleassetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_ba4a89fd-e49a-4ba7-b541-83febbea4365" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_62d6c454-97c9-4d5c-99d2-7f02abf2732a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_ba4a89fd-e49a-4ba7-b541-83febbea4365" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths_62d6c454-97c9-4d5c-99d2-7f02abf2732a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_462ff6b1-85f6-441f-ac60-c5e9e2b6027a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_ba4a89fd-e49a-4ba7-b541-83febbea4365" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo_462ff6b1-85f6-441f-ac60-c5e9e2b6027a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_c9258657-4f8d-4aee-85c6-b728ed164b68" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_ba4a89fd-e49a-4ba7-b541-83febbea4365" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree_c9258657-4f8d-4aee-85c6-b728ed164b68" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_c0abf1f0-9387-40c5-b3c9-2233e54db9f0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_ba4a89fd-e49a-4ba7-b541-83febbea4365" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour_c0abf1f0-9387-40c5-b3c9-2233e54db9f0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_f30bfdd3-7400-41eb-b4ca-08cbc1d3628a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_ba4a89fd-e49a-4ba7-b541-83febbea4365" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive_f30bfdd3-7400-41eb-b4ca-08cbc1d3628a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_1509db68-3ce9-4930-9fc3-d3d0b51a7116" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_ba4a89fd-e49a-4ba7-b541-83febbea4365" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive_1509db68-3ce9-4930-9fc3-d3d0b51a7116" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_c293f348-ea49-447e-bbb6-51fdce2de70b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract_ba4a89fd-e49a-4ba7-b541-83febbea4365" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_c293f348-ea49-447e-bbb6-51fdce2de70b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/Debt" xlink:type="simple" xlink:href="aon-20201231.xsd#Debt"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/Debt" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_c5c5fcba-0f00-4346-a4e9-eecc8be42b6d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureTextBlock_d3ada411-4731-40ad-a362-c654a3f960de" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_c5c5fcba-0f00-4346-a4e9-eecc8be42b6d" xlink:to="loc_us-gaap_DebtDisclosureTextBlock_d3ada411-4731-40ad-a362-c654a3f960de" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/DebtTables" xlink:type="simple" xlink:href="aon-20201231.xsd#DebtTables"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/DebtTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_5031dcd6-0c31-4907-a4c0-1eabb7bd8a12" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDebtTableTextBlock_d20e34ea-6bad-4a2b-aef3-7fe75456d33d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfDebtTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_5031dcd6-0c31-4907-a4c0-1eabb7bd8a12" xlink:to="loc_us-gaap_ScheduleOfDebtTableTextBlock_d20e34ea-6bad-4a2b-aef3-7fe75456d33d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_f9476e1e-c890-47e8-90f9-d3c643c04e90" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_5031dcd6-0c31-4907-a4c0-1eabb7bd8a12" xlink:to="loc_us-gaap_ScheduleOfMaturitiesOfLongTermDebtTableTextBlock_f9476e1e-c890-47e8-90f9-d3c643c04e90" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_5ca73956-5257-4159-8c77-9f0804cf0d6f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfDebtInstrumentsTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_5031dcd6-0c31-4907-a4c0-1eabb7bd8a12" xlink:to="loc_us-gaap_ScheduleOfDebtInstrumentsTextBlock_5ca73956-5257-4159-8c77-9f0804cf0d6f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/DebtSummaryofoutstandingdebtDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#DebtSummaryofoutstandingdebtDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/DebtSummaryofoutstandingdebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_0b2f889e-1aee-4f51-a1f6-2f29c3694c88" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_3b24a580-69f3-4e45-bc2f-38d0bbe424e0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_0b2f889e-1aee-4f51-a1f6-2f29c3694c88" xlink:to="loc_us-gaap_DebtInstrumentTable_3b24a580-69f3-4e45-bc2f-38d0bbe424e0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_68a9e4e3-a23d-492a-8c5f-d8e8ab2b0a68" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_3b24a580-69f3-4e45-bc2f-38d0bbe424e0" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_68a9e4e3-a23d-492a-8c5f-d8e8ab2b0a68" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_c95de4b9-e02a-4946-93fe-6005ed6624e0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_68a9e4e3-a23d-492a-8c5f-d8e8ab2b0a68" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_c95de4b9-e02a-4946-93fe-6005ed6624e0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_2f162221-f6c9-4a1b-a91f-2689d92ceb30" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialPaperMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_c95de4b9-e02a-4946-93fe-6005ed6624e0" xlink:to="loc_us-gaap_CommercialPaperMember_2f162221-f6c9-4a1b-a91f-2689d92ceb30" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_ff5eadd6-f216-42a6-a1c4-fd8dc11bd654" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_3b24a580-69f3-4e45-bc2f-38d0bbe424e0" xlink:to="loc_us-gaap_DebtInstrumentAxis_ff5eadd6-f216-42a6-a1c4-fd8dc11bd654" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_ff5eadd6-f216-42a6-a1c4-fd8dc11bd654" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FivePointZeroZeroPercentSeniorNotesDueTwentyTwentyMember_7bad00cd-1e93-4808-b347-e0c7eff09f86" xlink:href="aon-20201231.xsd#aon_FivePointZeroZeroPercentSeniorNotesDueTwentyTwentyMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_FivePointZeroZeroPercentSeniorNotesDueTwentyTwentyMember_7bad00cd-1e93-4808-b347-e0c7eff09f86" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_6825adc7-dce5-419d-a588-62e071c55ae1" xlink:href="aon-20201231.xsd#aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_6825adc7-dce5-419d-a588-62e071c55ae1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_A2.20SeniorNotesdueNovember2020Member_bd773c26-9df1-4cdb-99b5-cd48927c12a3" xlink:href="aon-20201231.xsd#aon_A2.20SeniorNotesdueNovember2020Member"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_A2.20SeniorNotesdueNovember2020Member_bd773c26-9df1-4cdb-99b5-cd48927c12a3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_A4.00SeniorNotesDueNovember2023Member_5e003bcf-08dc-4e0a-8ac1-2ede54566e75" xlink:href="aon-20201231.xsd#aon_A4.00SeniorNotesDueNovember2023Member"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_A4.00SeniorNotesDueNovember2023Member_5e003bcf-08dc-4e0a-8ac1-2ede54566e75" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_A3.50NotesdueJune2024Member_bd7b9c46-6d88-4bd3-b73f-398b2573c9de" xlink:href="aon-20201231.xsd#aon_A3.50NotesdueJune2024Member"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_A3.50NotesdueJune2024Member_bd7b9c46-6d88-4bd3-b73f-398b2573c9de" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_A3.875SeniorNotesdueDecember2025Member_d6cb3076-fb1e-4194-9aa2-9b63c5c10dc5" xlink:href="aon-20201231.xsd#aon_A3.875SeniorNotesdueDecember2025Member"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_A3.875SeniorNotesdueDecember2025Member_d6cb3076-fb1e-4194-9aa2-9b63c5c10dc5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_A2.875notesdue2026Member_1097543a-8a2c-4863-a871-745d72988ac6" xlink:href="aon-20201231.xsd#aon_A2.875notesdue2026Member"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_A2.875notesdue2026Member_1097543a-8a2c-4863-a871-745d72988ac6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member_b9cc5537-1f54-4f6d-ad24-7f533a207ab2" xlink:href="aon-20201231.xsd#aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_JuniorSubordinatedDeferrableInterestDebentures8.205PercentDue2027Member_b9cc5537-1f54-4f6d-ad24-7f533a207ab2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_A4.50SeniorNotesDueDecember2028Member_bdd0ee6a-55f7-492b-8b8d-c57e15f96c16" xlink:href="aon-20201231.xsd#aon_A4.50SeniorNotesDueDecember2028Member"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_A4.50SeniorNotesDueDecember2028Member_bdd0ee6a-55f7-492b-8b8d-c57e15f96c16" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_A3.75SeniorNotesDueMay22029Member_6f635b2e-9457-4ee7-bcba-cc344c732643" xlink:href="aon-20201231.xsd#aon_A3.75SeniorNotesDueMay22029Member"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_A3.75SeniorNotesDueMay22029Member_6f635b2e-9457-4ee7-bcba-cc344c732643" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_A280SeniorNotesDueMay2030Member_83c5be73-ddbc-4f9b-ae74-456764adf460" xlink:href="aon-20201231.xsd#aon_A280SeniorNotesDueMay2030Member"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_A280SeniorNotesDueMay2030Member_83c5be73-ddbc-4f9b-ae74-456764adf460" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_SeniorNotes625PercentDue2040Member_7843f62c-58ec-4f59-b20f-e65b5f8ed0ca" xlink:href="aon-20201231.xsd#aon_SeniorNotes625PercentDue2040Member"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_SeniorNotes625PercentDue2040Member_7843f62c-58ec-4f59-b20f-e65b5f8ed0ca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_SeniorNotes4.25PercentDue2042Member_53240b38-ece0-4592-952a-163fcefb2cac" xlink:href="aon-20201231.xsd#aon_SeniorNotes4.25PercentDue2042Member"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_SeniorNotes4.25PercentDue2042Member_53240b38-ece0-4592-952a-163fcefb2cac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_NotesDueat2043at4.45PercentMember_453cb330-abef-4bad-b191-31c509aa15fa" xlink:href="aon-20201231.xsd#aon_NotesDueat2043at4.45PercentMember"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_NotesDueat2043at4.45PercentMember_453cb330-abef-4bad-b191-31c509aa15fa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_A4.60SeniorNotesDueJune2044Member_f4a1d12f-3d8a-40aa-add5-0539a297df74" xlink:href="aon-20201231.xsd#aon_A4.60SeniorNotesDueJune2044Member"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_A4.60SeniorNotesDueJune2044Member_f4a1d12f-3d8a-40aa-add5-0539a297df74" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FourPointSevenFivePercentSeniorNotesDueTwentyFortyFiveMember_8b73e17e-f60e-468f-b509-4222ad2f45fe" xlink:href="aon-20201231.xsd#aon_FourPointSevenFivePercentSeniorNotesDueTwentyFortyFiveMember"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_42f4b936-d441-47ed-9f59-c8b84a5a0a1e" xlink:to="loc_aon_FourPointSevenFivePercentSeniorNotesDueTwentyFortyFiveMember_8b73e17e-f60e-468f-b509-4222ad2f45fe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_12ca2076-c905-4c1f-9708-3e9bad4d6ca0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_3b24a580-69f3-4e45-bc2f-38d0bbe424e0" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_12ca2076-c905-4c1f-9708-3e9bad4d6ca0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_ddd9e665-872f-451c-9576-5f58732076a3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_12ca2076-c905-4c1f-9708-3e9bad4d6ca0" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_ddd9e665-872f-451c-9576-5f58732076a3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_ab2e1774-e91b-4ae0-8f87-17ba5bc6c0ac" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SeniorNotesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ddd9e665-872f-451c-9576-5f58732076a3" xlink:to="loc_us-gaap_SeniorNotesMember_ab2e1774-e91b-4ae0-8f87-17ba5bc6c0ac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesPayableOtherPayablesMember_036f8620-553d-482f-97d2-5749200bcc95" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotesPayableOtherPayablesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_ddd9e665-872f-451c-9576-5f58732076a3" xlink:to="loc_us-gaap_NotesPayableOtherPayablesMember_036f8620-553d-482f-97d2-5749200bcc95" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_ca72a43c-4090-45dc-8211-367e6f61d81d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_3b24a580-69f3-4e45-bc2f-38d0bbe424e0" xlink:to="loc_us-gaap_DebtInstrumentLineItems_ca72a43c-4090-45dc-8211-367e6f61d81d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_2fa7ee65-81a8-4190-a8a4-fba601c7211c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtLongtermAndShorttermCombinedAmount"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ca72a43c-4090-45dc-8211-367e6f61d81d" xlink:to="loc_us-gaap_DebtLongtermAndShorttermCombinedAmount_2fa7ee65-81a8-4190-a8a4-fba601c7211c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtCurrent_ebbc081c-8d80-46a3-b205-db6e117d8080" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtCurrent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ca72a43c-4090-45dc-8211-367e6f61d81d" xlink:to="loc_us-gaap_DebtCurrent_ebbc081c-8d80-46a3-b205-db6e117d8080" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_2e6d2d42-a6e7-4bbf-a293-3b4f9106a260" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ca72a43c-4090-45dc-8211-367e6f61d81d" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_2e6d2d42-a6e7-4bbf-a293-3b4f9106a260" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_52783d0f-045a-4078-8824-de7ee18e3d02" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ca72a43c-4090-45dc-8211-367e6f61d81d" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_52783d0f-045a-4078-8824-de7ee18e3d02" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_754d8eaa-cde8-4dae-a28d-b7620bbe26ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ca72a43c-4090-45dc-8211-367e6f61d81d" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_754d8eaa-cde8-4dae-a28d-b7620bbe26ee" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/DebtNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#DebtNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/DebtNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_da25c26e-c141-4e96-9e47-134c636fd000" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_cfd2ff4d-05ec-4629-b691-2fc9280a8683" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_da25c26e-c141-4e96-9e47-134c636fd000" xlink:to="loc_us-gaap_DebtInstrumentTable_cfd2ff4d-05ec-4629-b691-2fc9280a8683" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_87286e5f-bc63-4c5a-9649-490066f30281" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_cfd2ff4d-05ec-4629-b691-2fc9280a8683" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_87286e5f-bc63-4c5a-9649-490066f30281" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_e6c36b3a-02a7-4543-a8c0-0ed602b1171a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_87286e5f-bc63-4c5a-9649-490066f30281" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_e6c36b3a-02a7-4543-a8c0-0ed602b1171a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_af6767c5-c2af-43c9-bdfb-3dd628442526" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialPaperMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_e6c36b3a-02a7-4543-a8c0-0ed602b1171a" xlink:to="loc_us-gaap_CommercialPaperMember_af6767c5-c2af-43c9-bdfb-3dd628442526" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_f172cc91-1345-40bc-983b-ebdff84320a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_cfd2ff4d-05ec-4629-b691-2fc9280a8683" xlink:to="loc_us-gaap_CreditFacilityAxis_f172cc91-1345-40bc-983b-ebdff84320a4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_66a61a86-b968-45f3-bb91-7c1f3412e3b8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CreditFacilityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityAxis_f172cc91-1345-40bc-983b-ebdff84320a4" xlink:to="loc_us-gaap_CreditFacilityDomain_66a61a86-b968-45f3-bb91-7c1f3412e3b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CreditFacilityExpiringFebruary2022Member_e10da594-19c7-4a3f-aa05-7a7f234b68c9" xlink:href="aon-20201231.xsd#aon_CreditFacilityExpiringFebruary2022Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityDomain_66a61a86-b968-45f3-bb91-7c1f3412e3b8" xlink:to="loc_aon_CreditFacilityExpiringFebruary2022Member_e10da594-19c7-4a3f-aa05-7a7f234b68c9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CreditFacilityExpiringOctober2023Member_add5e318-d190-4d1b-8a52-7d57f58ed3fe" xlink:href="aon-20201231.xsd#aon_CreditFacilityExpiringOctober2023Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CreditFacilityDomain_66a61a86-b968-45f3-bb91-7c1f3412e3b8" xlink:to="loc_aon_CreditFacilityExpiringOctober2023Member_add5e318-d190-4d1b-8a52-7d57f58ed3fe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_cda69f30-2b92-4672-9820-b6fc458b71bb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_cfd2ff4d-05ec-4629-b691-2fc9280a8683" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_cda69f30-2b92-4672-9820-b6fc458b71bb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_4b7e13f3-4fab-40e7-8456-55a6a874d31a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_cda69f30-2b92-4672-9820-b6fc458b71bb" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_4b7e13f3-4fab-40e7-8456-55a6a874d31a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_db21a405-68fe-43db-9527-d5affa64009c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SeniorNotesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4b7e13f3-4fab-40e7-8456-55a6a874d31a" xlink:to="loc_us-gaap_SeniorNotesMember_db21a405-68fe-43db-9527-d5affa64009c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_1e299c1a-3c09-4637-9082-53126e1882db" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_4b7e13f3-4fab-40e7-8456-55a6a874d31a" xlink:to="loc_us-gaap_LineOfCreditMember_1e299c1a-3c09-4637-9082-53126e1882db" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_7a0bc181-12de-4167-be6e-e6e9707c759e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_cfd2ff4d-05ec-4629-b691-2fc9280a8683" xlink:to="loc_us-gaap_DebtInstrumentAxis_7a0bc181-12de-4167-be6e-e6e9707c759e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_75b52f4e-e7ed-4ac4-8e70-c671a0fa0dff" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentAxis_7a0bc181-12de-4167-be6e-e6e9707c759e" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_75b52f4e-e7ed-4ac4-8e70-c671a0fa0dff" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_A5.00SeniorNotesDueSeptember2020Member_551de427-a392-4c08-bab4-0cd567c9d3c6" xlink:href="aon-20201231.xsd#aon_A5.00SeniorNotesDueSeptember2020Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_75b52f4e-e7ed-4ac4-8e70-c671a0fa0dff" xlink:to="loc_aon_A5.00SeniorNotesDueSeptember2020Member_551de427-a392-4c08-bab4-0cd567c9d3c6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_A280SeniorNotesDueMay2030Member_df1defda-6530-4223-ac04-558cc2ae5c5f" xlink:href="aon-20201231.xsd#aon_A280SeniorNotesDueMay2030Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_75b52f4e-e7ed-4ac4-8e70-c671a0fa0dff" xlink:to="loc_aon_A280SeniorNotesDueMay2030Member_df1defda-6530-4223-ac04-558cc2ae5c5f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_09bbe605-659a-46c1-bca8-70d39e09daed" xlink:href="aon-20201231.xsd#aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_75b52f4e-e7ed-4ac4-8e70-c671a0fa0dff" xlink:to="loc_aon_TwoPointEightZeroPercentSeniorNotesDueTwentyTwentyOneMember_09bbe605-659a-46c1-bca8-70d39e09daed" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_A2.20SeniorNotesdueNovember2020Member_667c5e70-d898-4b79-9bdc-fff542f46fb1" xlink:href="aon-20201231.xsd#aon_A2.20SeniorNotesdueNovember2020Member"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_75b52f4e-e7ed-4ac4-8e70-c671a0fa0dff" xlink:to="loc_aon_A2.20SeniorNotesdueNovember2020Member_667c5e70-d898-4b79-9bdc-fff542f46fb1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_A3.75SeniorNotesDueMay22029Member_8d3772a9-ace8-46df-be32-76899d1f4f23" xlink:href="aon-20201231.xsd#aon_A3.75SeniorNotesDueMay22029Member"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_75b52f4e-e7ed-4ac4-8e70-c671a0fa0dff" xlink:to="loc_aon_A3.75SeniorNotesDueMay22029Member_8d3772a9-ace8-46df-be32-76899d1f4f23" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_EuropeanMultiCurrencyCommercialPaperProgramMember_d3147f10-fc34-49d4-a392-562af3405917" xlink:href="aon-20201231.xsd#aon_EuropeanMultiCurrencyCommercialPaperProgramMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_75b52f4e-e7ed-4ac4-8e70-c671a0fa0dff" xlink:to="loc_aon_EuropeanMultiCurrencyCommercialPaperProgramMember_d3147f10-fc34-49d4-a392-562af3405917" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_USCommercialPaperProgramMember_1db27d41-92c0-4023-a834-d41d91b726c4" xlink:href="aon-20201231.xsd#aon_USCommercialPaperProgramMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_75b52f4e-e7ed-4ac4-8e70-c671a0fa0dff" xlink:to="loc_aon_USCommercialPaperProgramMember_1db27d41-92c0-4023-a834-d41d91b726c4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_d7b19aa7-9b4f-47f1-b666-2c7df511f727" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_cfd2ff4d-05ec-4629-b691-2fc9280a8683" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_d7b19aa7-9b4f-47f1-b666-2c7df511f727" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_a8ac88e0-66a6-4529-b40b-bb10c6a03fc0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_d7b19aa7-9b4f-47f1-b666-2c7df511f727" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_a8ac88e0-66a6-4529-b40b-bb10c6a03fc0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_5ea86bb7-c33d-4daa-b1e6-be5d9d29741c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubsequentEventMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_a8ac88e0-66a6-4529-b40b-bb10c6a03fc0" xlink:to="loc_us-gaap_SubsequentEventMember_5ea86bb7-c33d-4daa-b1e6-be5d9d29741c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_3dcea2f9-4140-4e7f-be28-5fa5efbf0bd4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentTable_cfd2ff4d-05ec-4629-b691-2fc9280a8683" xlink:to="loc_us-gaap_DebtInstrumentLineItems_3dcea2f9-4140-4e7f-be28-5fa5efbf0bd4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_6e72b63c-ead8-4e70-899e-293737071d82" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3dcea2f9-4140-4e7f-be28-5fa5efbf0bd4" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_6e72b63c-ead8-4e70-899e-293737071d82" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_dc6760d3-0fc9-4379-9737-4f00f435c726" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3dcea2f9-4140-4e7f-be28-5fa5efbf0bd4" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_dc6760d3-0fc9-4379-9737-4f00f435c726" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_548e18df-7d4f-4fed-be71-2826008d0aa8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GainsLossesOnExtinguishmentOfDebt"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3dcea2f9-4140-4e7f-be28-5fa5efbf0bd4" xlink:to="loc_us-gaap_GainsLossesOnExtinguishmentOfDebt_548e18df-7d4f-4fed-be71-2826008d0aa8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_c94d7571-5a22-4b90-89b5-bc4333d0ea19" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentRepurchasedFaceAmount"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3dcea2f9-4140-4e7f-be28-5fa5efbf0bd4" xlink:to="loc_us-gaap_DebtInstrumentRepurchasedFaceAmount_c94d7571-5a22-4b90-89b5-bc4333d0ea19" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_NumberOfCreditFacilities_0075f340-9a77-4118-93bf-502362304add" xlink:href="aon-20201231.xsd#aon_NumberOfCreditFacilities"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3dcea2f9-4140-4e7f-be28-5fa5efbf0bd4" xlink:to="loc_aon_NumberOfCreditFacilities_0075f340-9a77-4118-93bf-502362304add" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_14b6023b-1539-4613-a6a5-0186658417aa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3dcea2f9-4140-4e7f-be28-5fa5efbf0bd4" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_14b6023b-1539-4613-a6a5-0186658417aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_LineOfCreditFacilityMaximumBorrowingCapacityIncreaseDecrease_3a9780b3-a4b8-4322-b229-8f184be81089" xlink:href="aon-20201231.xsd#aon_LineOfCreditFacilityMaximumBorrowingCapacityIncreaseDecrease"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3dcea2f9-4140-4e7f-be28-5fa5efbf0bd4" xlink:to="loc_aon_LineOfCreditFacilityMaximumBorrowingCapacityIncreaseDecrease_3a9780b3-a4b8-4322-b229-8f184be81089" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_73f915ee-7d3c-4385-be39-78dae76d7381" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3dcea2f9-4140-4e7f-be28-5fa5efbf0bd4" xlink:to="loc_us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity_73f915ee-7d3c-4385-be39-78dae76d7381" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCredit_e24f5338-b134-4f87-bbd2-be78441e20aa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCredit"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtInstrumentLineItems_3dcea2f9-4140-4e7f-be28-5fa5efbf0bd4" xlink:to="loc_us-gaap_LineOfCredit_e24f5338-b134-4f87-bbd2-be78441e20aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/DebtRepaymentsoflongtermdebtDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#DebtRepaymentsoflongtermdebtDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/DebtRepaymentsoflongtermdebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_f851205f-8fae-44f2-8500-75e33f6ff962" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_943a3f90-c99c-4f41-943d-296d95f37a40" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_f851205f-8fae-44f2-8500-75e33f6ff962" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths_943a3f90-c99c-4f41-943d-296d95f37a40" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_ce936d91-5dc6-4df1-b7b1-ca67c884ee14" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_f851205f-8fae-44f2-8500-75e33f6ff962" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo_ce936d91-5dc6-4df1-b7b1-ca67c884ee14" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_d5251048-b8e9-4519-8163-2848e3a633c8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_f851205f-8fae-44f2-8500-75e33f6ff962" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree_d5251048-b8e9-4519-8163-2848e3a633c8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_168a7b2a-1bfd-4a5b-96ae-ac83f5c1784e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_f851205f-8fae-44f2-8500-75e33f6ff962" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour_168a7b2a-1bfd-4a5b-96ae-ac83f5c1784e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_10db2d9a-5295-4cd4-8e83-795a113dbb28" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_f851205f-8fae-44f2-8500-75e33f6ff962" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive_10db2d9a-5295-4cd4-8e83-795a113dbb28" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_a597134d-b198-4d85-ba23-a6d3c8cf5af7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_f851205f-8fae-44f2-8500-75e33f6ff962" xlink:to="loc_us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive_a597134d-b198-4d85-ba23-a6d3c8cf5af7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_930c371f-1663-4ec8-a52c-b04aa29b8545" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_f851205f-8fae-44f2-8500-75e33f6ff962" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_930c371f-1663-4ec8-a52c-b04aa29b8545" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_Noncashpaymentoflongtermdebtnet_7826ae25-0a9c-4bfc-a6a2-fa53f9b51eaf" xlink:href="aon-20201231.xsd#aon_Noncashpaymentoflongtermdebtnet"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_f851205f-8fae-44f2-8500-75e33f6ff962" xlink:to="loc_aon_Noncashpaymentoflongtermdebtnet_7826ae25-0a9c-4bfc-a6a2-fa53f9b51eaf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_7ada0020-8d1e-4921-a83c-88adb8dd07ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebt"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_f851205f-8fae-44f2-8500-75e33f6ff962" xlink:to="loc_us-gaap_LongTermDebt_7ada0020-8d1e-4921-a83c-88adb8dd07ee" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/DebtScheduleofCommercialPaperDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#DebtScheduleofCommercialPaperDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/DebtScheduleofCommercialPaperDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtDisclosureAbstract_ca365293-5609-49d6-bc47-4ea60fc5ed42" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DebtDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityTable_23e9ace0-6c9c-4801-afb5-bea8878f84be" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DebtDisclosureAbstract_ca365293-5609-49d6-bc47-4ea60fc5ed42" xlink:to="loc_us-gaap_LineOfCreditFacilityTable_23e9ace0-6c9c-4801-afb5-bea8878f84be" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_86737ae3-020d-448a-ba45-72dfcc74468c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_23e9ace0-6c9c-4801-afb5-bea8878f84be" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_86737ae3-020d-448a-ba45-72dfcc74468c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_58f81da9-f550-4d5b-9cad-98e0590f7b8a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_86737ae3-020d-448a-ba45-72dfcc74468c" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_58f81da9-f550-4d5b-9cad-98e0590f7b8a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommercialPaperMember_397ba176-cd59-4f86-b291-c47fd57f54cb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommercialPaperMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_58f81da9-f550-4d5b-9cad-98e0590f7b8a" xlink:to="loc_us-gaap_CommercialPaperMember_397ba176-cd59-4f86-b291-c47fd57f54cb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityLineItems_cdcf7c9d-e111-4af1-9d7f-c53b2be90779" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LineOfCreditFacilityLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityTable_23e9ace0-6c9c-4801-afb5-bea8878f84be" xlink:to="loc_us-gaap_LineOfCreditFacilityLineItems_cdcf7c9d-e111-4af1-9d7f-c53b2be90779" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermBorrowings_ae718436-b3ce-4ca7-a410-ebcfbbf950ef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermBorrowings"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_cdcf7c9d-e111-4af1-9d7f-c53b2be90779" xlink:to="loc_us-gaap_ShortTermBorrowings_ae718436-b3ce-4ca7-a410-ebcfbbf950ef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShorttermDebtAverageOutstandingAmount_e51018cc-1372-4248-b3fc-ff682b93d4b2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShorttermDebtAverageOutstandingAmount"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_cdcf7c9d-e111-4af1-9d7f-c53b2be90779" xlink:to="loc_us-gaap_ShorttermDebtAverageOutstandingAmount_e51018cc-1372-4248-b3fc-ff682b93d4b2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ShortTermDebtAverageOutstandingAmountWeightedAverageInterestRate_34383fa8-83ed-4dfc-94ba-99f03f7804b5" xlink:href="aon-20201231.xsd#aon_ShortTermDebtAverageOutstandingAmountWeightedAverageInterestRate"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LineOfCreditFacilityLineItems_cdcf7c9d-e111-4af1-9d7f-c53b2be90779" xlink:to="loc_aon_ShortTermDebtAverageOutstandingAmountWeightedAverageInterestRate_34383fa8-83ed-4dfc-94ba-99f03f7804b5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/LeaseCommitments" xlink:type="simple" xlink:href="aon-20201231.xsd#LeaseCommitments"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitments" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeasesAbstract_e17bf3f9-b844-457f-b413-50ebabe3d7a8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeasesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeasesTextBlock_ae526ead-aa1b-413d-9063-835d3248832f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeasesTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_e17bf3f9-b844-457f-b413-50ebabe3d7a8" xlink:to="loc_us-gaap_LesseeOperatingLeasesTextBlock_ae526ead-aa1b-413d-9063-835d3248832f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeFinanceLeasesTextBlock_b40b6705-ba9a-4424-a4f7-137b44fc719e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeFinanceLeasesTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_e17bf3f9-b844-457f-b413-50ebabe3d7a8" xlink:to="loc_us-gaap_LesseeFinanceLeasesTextBlock_b40b6705-ba9a-4424-a4f7-137b44fc719e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/LeaseCommitmentsTables" xlink:type="simple" xlink:href="aon-20201231.xsd#LeaseCommitmentsTables"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitmentsTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeasesAbstract_23d2f5a2-c8f0-4c49-9f72-33e0a73b9b28" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeasesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_AssetsAndLiabilitiesOfLesseeTableTextBlock_64d3eb3a-73cc-4aaa-b3b9-745672c87031" xlink:href="aon-20201231.xsd#aon_AssetsAndLiabilitiesOfLesseeTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_23d2f5a2-c8f0-4c49-9f72-33e0a73b9b28" xlink:to="loc_aon_AssetsAndLiabilitiesOfLesseeTableTextBlock_64d3eb3a-73cc-4aaa-b3b9-745672c87031" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCostTableTextBlock_1d1884e8-2ef6-4f56-9fde-ca5b688441fa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseCostTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_23d2f5a2-c8f0-4c49-9f72-33e0a73b9b28" xlink:to="loc_us-gaap_LeaseCostTableTextBlock_1d1884e8-2ef6-4f56-9fde-ca5b688441fa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_5b2add40-5960-46f2-ab24-3087ccd5efa1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_23d2f5a2-c8f0-4c49-9f72-33e0a73b9b28" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityMaturityTableTextBlock_5b2add40-5960-46f2-ab24-3087ccd5efa1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_bebe09ce-8d0c-49fe-865d-66fed516b55d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_23d2f5a2-c8f0-4c49-9f72-33e0a73b9b28" xlink:to="loc_us-gaap_FinanceLeaseLiabilityMaturityTableTextBlock_bebe09ce-8d0c-49fe-865d-66fed516b55d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/LeaseCommitmentsAssetsandLiabilitiesofLesseeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#LeaseCommitmentsAssetsandLiabilitiesofLesseeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitmentsAssetsandLiabilitiesofLesseeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeasesAbstract_16a7d95e-9f02-4b6f-815e-eba52a1fa8d2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeasesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_fee876b7-f5e9-458b-b4e8-d49ea56c39a7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_16a7d95e-9f02-4b6f-815e-eba52a1fa8d2" xlink:to="loc_us-gaap_AssetsAbstract_fee876b7-f5e9-458b-b4e8-d49ea56c39a7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseRightOfUseAsset_b4c6ba6e-f470-45c1-bd18-704e2725f128" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseRightOfUseAsset"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_fee876b7-f5e9-458b-b4e8-d49ea56c39a7" xlink:to="loc_us-gaap_OperatingLeaseRightOfUseAsset_b4c6ba6e-f470-45c1-bd18-704e2725f128" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAsset_11a075b1-42cc-4c39-828a-309a355eef4a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAsset"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_fee876b7-f5e9-458b-b4e8-d49ea56c39a7" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAsset_11a075b1-42cc-4c39-828a-309a355eef4a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_4ec3e780-c8a8-4c4b-80fc-ca329746ea44" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_fee876b7-f5e9-458b-b4e8-d49ea56c39a7" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetStatementOfFinancialPositionExtensibleList_4ec3e780-c8a8-4c4b-80fc-ca329746ea44" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_OperatingLeaseAndFinanceLeaseRightofUseAsset_ab5e0bc4-c593-4b31-a1e7-1089756134ae" xlink:href="aon-20201231.xsd#aon_OperatingLeaseAndFinanceLeaseRightofUseAsset"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsAbstract_fee876b7-f5e9-458b-b4e8-d49ea56c39a7" xlink:to="loc_aon_OperatingLeaseAndFinanceLeaseRightofUseAsset_ab5e0bc4-c593-4b31-a1e7-1089756134ae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_e6373c3f-5afd-4e64-8b6c-16ad55bc61f4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_16a7d95e-9f02-4b6f-815e-eba52a1fa8d2" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_e6373c3f-5afd-4e64-8b6c-16ad55bc61f4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_ad3a56a7-e62d-42e5-b414-06c2d25cbe89" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_16a7d95e-9f02-4b6f-815e-eba52a1fa8d2" xlink:to="loc_us-gaap_LiabilitiesAbstract_ad3a56a7-e62d-42e5-b414-06c2d25cbe89" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CurrentLeaseLiabilitiesAbstract_169a4cb8-140e-45ec-9206-52e52b70dbcc" xlink:href="aon-20201231.xsd#aon_CurrentLeaseLiabilitiesAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_ad3a56a7-e62d-42e5-b414-06c2d25cbe89" xlink:to="loc_aon_CurrentLeaseLiabilitiesAbstract_169a4cb8-140e-45ec-9206-52e52b70dbcc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityCurrent_115fafef-e9a3-4aaa-884f-c58d2236b2b4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityCurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CurrentLeaseLiabilitiesAbstract_169a4cb8-140e-45ec-9206-52e52b70dbcc" xlink:to="loc_us-gaap_OperatingLeaseLiabilityCurrent_115fafef-e9a3-4aaa-884f-c58d2236b2b4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrent_76f30d93-7728-46f6-a4d6-f42fa90c2e49" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CurrentLeaseLiabilitiesAbstract_169a4cb8-140e-45ec-9206-52e52b70dbcc" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrent_76f30d93-7728-46f6-a4d6-f42fa90c2e49" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_5f9f048e-5b49-438a-8c3f-3df5031030a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CurrentLeaseLiabilitiesAbstract_169a4cb8-140e-45ec-9206-52e52b70dbcc" xlink:to="loc_us-gaap_FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList_5f9f048e-5b49-438a-8c3f-3df5031030a4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_NoncurrentLeaseLiabilitiesAbstract_a928b051-910d-44a2-b900-f2d6cc0281ac" xlink:href="aon-20201231.xsd#aon_NoncurrentLeaseLiabilitiesAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_ad3a56a7-e62d-42e5-b414-06c2d25cbe89" xlink:to="loc_aon_NoncurrentLeaseLiabilitiesAbstract_a928b051-910d-44a2-b900-f2d6cc0281ac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_97e42fd9-d820-4b95-a291-16736254c0f7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilityNoncurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_NoncurrentLeaseLiabilitiesAbstract_a928b051-910d-44a2-b900-f2d6cc0281ac" xlink:to="loc_us-gaap_OperatingLeaseLiabilityNoncurrent_97e42fd9-d820-4b95-a291-16736254c0f7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_a75c32fc-550c-4b87-b0f4-ac1ce3c2fb66" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_NoncurrentLeaseLiabilitiesAbstract_a928b051-910d-44a2-b900-f2d6cc0281ac" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList_a75c32fc-550c-4b87-b0f4-ac1ce3c2fb66" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_70d1486b-d252-488f-a18f-e4527b243bbc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityNoncurrent"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_NoncurrentLeaseLiabilitiesAbstract_a928b051-910d-44a2-b900-f2d6cc0281ac" xlink:to="loc_us-gaap_FinanceLeaseLiabilityNoncurrent_70d1486b-d252-488f-a18f-e4527b243bbc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_OperatingAndFinanceLeaseLiability_5db9a484-4986-47cc-ab02-d60a952b7036" xlink:href="aon-20201231.xsd#aon_OperatingAndFinanceLeaseLiability"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesAbstract_ad3a56a7-e62d-42e5-b414-06c2d25cbe89" xlink:to="loc_aon_OperatingAndFinanceLeaseLiability_5db9a484-4986-47cc-ab02-d60a952b7036" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/LeaseCommitmentsLeaseCostsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#LeaseCommitmentsLeaseCostsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitmentsLeaseCostsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeasesAbstract_580864c3-3786-4c0f-a1e5-e2d410da0226" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeasesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseCost_ccb065f5-14ae-438f-a833-f30f648e5168" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseCost"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_580864c3-3786-4c0f-a1e5-e2d410da0226" xlink:to="loc_us-gaap_OperatingLeaseCost_ccb065f5-14ae-438f-a833-f30f648e5168" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FinanceLeaseCost1Abstract_dd1bec59-6b1f-4c18-b23f-b45bc8104905" xlink:href="aon-20201231.xsd#aon_FinanceLeaseCost1Abstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_580864c3-3786-4c0f-a1e5-e2d410da0226" xlink:to="loc_aon_FinanceLeaseCost1Abstract_dd1bec59-6b1f-4c18-b23f-b45bc8104905" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_9af7121f-d379-41bf-b11b-3f7fbd028a28" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseRightOfUseAssetAmortization"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_FinanceLeaseCost1Abstract_dd1bec59-6b1f-4c18-b23f-b45bc8104905" xlink:to="loc_us-gaap_FinanceLeaseRightOfUseAssetAmortization_9af7121f-d379-41bf-b11b-3f7fbd028a28" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseInterestExpense_4b50b0fc-b354-4536-93f4-893b72d0868d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseInterestExpense"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_FinanceLeaseCost1Abstract_dd1bec59-6b1f-4c18-b23f-b45bc8104905" xlink:to="loc_us-gaap_FinanceLeaseInterestExpense_4b50b0fc-b354-4536-93f4-893b72d0868d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableLeaseCost_3b566006-1552-4a6f-8a9d-7ce12629d65f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_VariableLeaseCost"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_580864c3-3786-4c0f-a1e5-e2d410da0226" xlink:to="loc_us-gaap_VariableLeaseCost_3b566006-1552-4a6f-8a9d-7ce12629d65f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermLeaseCost_5a7e96eb-64ea-4098-830e-5141a9274a8f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShortTermLeaseCost"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_580864c3-3786-4c0f-a1e5-e2d410da0226" xlink:to="loc_us-gaap_ShortTermLeaseCost_5a7e96eb-64ea-4098-830e-5141a9274a8f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubleaseIncome_35d9167e-8cde-4698-bdec-0d6b0f41169d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SubleaseIncome"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_580864c3-3786-4c0f-a1e5-e2d410da0226" xlink:to="loc_us-gaap_SubleaseIncome_35d9167e-8cde-4698-bdec-0d6b0f41169d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeaseCost_3f425c72-9ed1-4ae2-832a-f12ffbcaaa73" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeaseCost"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_580864c3-3786-4c0f-a1e5-e2d410da0226" xlink:to="loc_us-gaap_LeaseCost_3f425c72-9ed1-4ae2-832a-f12ffbcaaa73" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/LeaseCommitmentsLeaseTermsandAssumptionsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#LeaseCommitmentsLeaseTermsandAssumptionsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitmentsLeaseTermsandAssumptionsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeasesAbstract_ba3cc773-74eb-4600-a8e0-81fa01a71e64" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeasesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_LesseeWeightedaverageRemainingLeaseTermAbstract_919b4906-86cd-4151-a9fb-9cff56cb7ff5" xlink:href="aon-20201231.xsd#aon_LesseeWeightedaverageRemainingLeaseTermAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_ba3cc773-74eb-4600-a8e0-81fa01a71e64" xlink:to="loc_aon_LesseeWeightedaverageRemainingLeaseTermAbstract_919b4906-86cd-4151-a9fb-9cff56cb7ff5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_792e5f77-bd4d-40c5-a1b4-ac84bc9b1a64" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LesseeWeightedaverageRemainingLeaseTermAbstract_919b4906-86cd-4151-a9fb-9cff56cb7ff5" xlink:to="loc_us-gaap_OperatingLeaseWeightedAverageRemainingLeaseTerm1_792e5f77-bd4d-40c5-a1b4-ac84bc9b1a64" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_f1d18e5e-cb4a-4aba-b704-714a08a538ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LesseeWeightedaverageRemainingLeaseTermAbstract_919b4906-86cd-4151-a9fb-9cff56cb7ff5" xlink:to="loc_us-gaap_FinanceLeaseWeightedAverageRemainingLeaseTerm1_f1d18e5e-cb4a-4aba-b704-714a08a538ee" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_LesseeWeightedAverageDiscountRateAbstract_f30c8793-251d-43d4-9422-ffe8792f9381" xlink:href="aon-20201231.xsd#aon_LesseeWeightedAverageDiscountRateAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_ba3cc773-74eb-4600-a8e0-81fa01a71e64" xlink:to="loc_aon_LesseeWeightedAverageDiscountRateAbstract_f30c8793-251d-43d4-9422-ffe8792f9381" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseDiscountRate_c45aa4a2-428f-488c-b3a9-bd150429c32b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseDiscountRate"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LesseeWeightedAverageDiscountRateAbstract_f30c8793-251d-43d4-9422-ffe8792f9381" xlink:to="loc_us-gaap_LesseeOperatingLeaseDiscountRate_c45aa4a2-428f-488c-b3a9-bd150429c32b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeFinanceLeaseDiscountRate_73860c56-fb77-4e8c-b208-c8ae9fa0af4c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeFinanceLeaseDiscountRate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LesseeWeightedAverageDiscountRateAbstract_f30c8793-251d-43d4-9422-ffe8792f9381" xlink:to="loc_us-gaap_LesseeFinanceLeaseDiscountRate_73860c56-fb77-4e8c-b208-c8ae9fa0af4c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/LeaseCommitmentsCashFlowofLesseeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#LeaseCommitmentsCashFlowofLesseeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitmentsCashFlowofLesseeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeasesAbstract_f52f36c8-2342-40fc-adf7-e5aced46dc04" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeasesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CashPaidForLeasesAbstract_5c7ba727-3ac9-4035-804d-3878fe508acd" xlink:href="aon-20201231.xsd#aon_CashPaidForLeasesAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_f52f36c8-2342-40fc-adf7-e5aced46dc04" xlink:to="loc_aon_CashPaidForLeasesAbstract_5c7ba727-3ac9-4035-804d-3878fe508acd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeasePayments_a2aca921-7eb3-40ce-98cd-79abde69a0d1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeasePayments"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CashPaidForLeasesAbstract_5c7ba727-3ac9-4035-804d-3878fe508acd" xlink:to="loc_us-gaap_OperatingLeasePayments_a2aca921-7eb3-40ce-98cd-79abde69a0d1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeasePrincipalPayments_e8b9a01a-3feb-418c-ab6d-a370b86d57a5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeasePrincipalPayments"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CashPaidForLeasesAbstract_5c7ba727-3ac9-4035-804d-3878fe508acd" xlink:to="loc_us-gaap_FinanceLeasePrincipalPayments_e8b9a01a-3feb-418c-ab6d-a370b86d57a5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_NoncashLeaseActivitiesAbstract_2df4c69e-fb34-48d1-bf01-8e7b22593173" xlink:href="aon-20201231.xsd#aon_NoncashLeaseActivitiesAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_f52f36c8-2342-40fc-adf7-e5aced46dc04" xlink:to="loc_aon_NoncashLeaseActivitiesAbstract_2df4c69e-fb34-48d1-bf01-8e7b22593173" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_9d63eb95-029c-45fc-9398-38dffa35eb07" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_NoncashLeaseActivitiesAbstract_2df4c69e-fb34-48d1-bf01-8e7b22593173" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability_9d63eb95-029c-45fc-9398-38dffa35eb07" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_1818c785-072d-41b2-8bea-aa60983a0c91" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_NoncashLeaseActivitiesAbstract_2df4c69e-fb34-48d1-bf01-8e7b22593173" xlink:to="loc_us-gaap_RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability_1818c785-072d-41b2-8bea-aa60983a0c91" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_OperatingLeaseRightOfUseAssetAmortization_183ab165-280d-4a3b-86cf-9eb3dcaa4c66" xlink:href="aon-20201231.xsd#aon_OperatingLeaseRightOfUseAssetAmortization"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_NoncashLeaseActivitiesAbstract_2df4c69e-fb34-48d1-bf01-8e7b22593173" xlink:to="loc_aon_OperatingLeaseRightOfUseAssetAmortization_183ab165-280d-4a3b-86cf-9eb3dcaa4c66" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_IncreaseDecreaseInOperatingLeaseLiabilitiesNoncurrent_b25863e4-f9f4-4f13-b691-74f36f9d3902" xlink:href="aon-20201231.xsd#aon_IncreaseDecreaseInOperatingLeaseLiabilitiesNoncurrent"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_NoncashLeaseActivitiesAbstract_2df4c69e-fb34-48d1-bf01-8e7b22593173" xlink:to="loc_aon_IncreaseDecreaseInOperatingLeaseLiabilitiesNoncurrent_b25863e4-f9f4-4f13-b691-74f36f9d3902" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/LeaseCommitmentsLeaseMaturityDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#LeaseCommitmentsLeaseMaturityDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/LeaseCommitmentsLeaseMaturityDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LeasesAbstract_07fd7132-c02c-4043-a71b-8bd8042f209a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LeasesAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_aaab1cbb-0412-4531-a41c-3d5a523e02ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_07fd7132-c02c-4043-a71b-8bd8042f209a" xlink:to="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_aaab1cbb-0412-4531-a41c-3d5a523e02ae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_b99657c0-79ce-48b5-85dd-7ebb97b7c8ef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_aaab1cbb-0412-4531-a41c-3d5a523e02ae" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths_b99657c0-79ce-48b5-85dd-7ebb97b7c8ef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_ddcd74e2-7f1f-4e27-9e83-065b7c8c9238" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_aaab1cbb-0412-4531-a41c-3d5a523e02ae" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo_ddcd74e2-7f1f-4e27-9e83-065b7c8c9238" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_e3094386-d3dd-46ff-a137-9b7acf9b9e44" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_aaab1cbb-0412-4531-a41c-3d5a523e02ae" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree_e3094386-d3dd-46ff-a137-9b7acf9b9e44" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_c0c3b20c-307c-4166-81ae-bc711200cc06" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_aaab1cbb-0412-4531-a41c-3d5a523e02ae" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFour_c0c3b20c-307c-4166-81ae-bc711200cc06" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_6c44c5a0-7dc7-44d3-b17c-8aa892670f25" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_aaab1cbb-0412-4531-a41c-3d5a523e02ae" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearFive_6c44c5a0-7dc7-44d3-b17c-8aa892670f25" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_e345b089-31d3-40bf-ba3b-c62023bcc8c5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_aaab1cbb-0412-4531-a41c-3d5a523e02ae" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive_e345b089-31d3-40bf-ba3b-c62023bcc8c5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5b8a90fc-cd94-4458-8e47-38ad7e9cc1ed" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_aaab1cbb-0412-4531-a41c-3d5a523e02ae" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue_5b8a90fc-cd94-4458-8e47-38ad7e9cc1ed" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_891e05a5-04ec-4535-beac-d8265869d2fc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_aaab1cbb-0412-4531-a41c-3d5a523e02ae" xlink:to="loc_us-gaap_LesseeOperatingLeaseLiabilityUndiscountedExcessAmount_891e05a5-04ec-4535-beac-d8265869d2fc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLeaseLiability_500fac86-63c0-4941-900c-56e23af53839" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLeaseLiability"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLeaseLiabilitiesPaymentsDueAbstract_aaab1cbb-0412-4531-a41c-3d5a523e02ae" xlink:to="loc_us-gaap_OperatingLeaseLiability_500fac86-63c0-4941-900c-56e23af53839" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_bbd65173-4132-4a9c-9dd9-50a73c92c580" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_07fd7132-c02c-4043-a71b-8bd8042f209a" xlink:to="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_bbd65173-4132-4a9c-9dd9-50a73c92c580" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_24a3efc7-27be-49e6-88f9-cf37ebe4bec5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_bbd65173-4132-4a9c-9dd9-50a73c92c580" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueNextTwelveMonths_24a3efc7-27be-49e6-88f9-cf37ebe4bec5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_f597bc5d-c0c4-4699-b89f-632d9e1f7367" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_bbd65173-4132-4a9c-9dd9-50a73c92c580" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearTwo_f597bc5d-c0c4-4699-b89f-632d9e1f7367" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_d7a4b027-4f89-4ab3-8576-074c39804950" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_bbd65173-4132-4a9c-9dd9-50a73c92c580" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearThree_d7a4b027-4f89-4ab3-8576-074c39804950" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_9126ea35-eb82-416f-aba2-b8d363a7ac12" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_bbd65173-4132-4a9c-9dd9-50a73c92c580" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFour_9126ea35-eb82-416f-aba2-b8d363a7ac12" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_b1cf3355-5212-4342-be1c-c748a617327d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_bbd65173-4132-4a9c-9dd9-50a73c92c580" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueYearFive_b1cf3355-5212-4342-be1c-c748a617327d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_efb423f9-36cc-4932-8474-8a5efa4e751c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_bbd65173-4132-4a9c-9dd9-50a73c92c580" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDueAfterYearFive_efb423f9-36cc-4932-8474-8a5efa4e751c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_5956dff1-5d86-47b9-b9c3-3c6ef999f3d6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityPaymentsDue"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_bbd65173-4132-4a9c-9dd9-50a73c92c580" xlink:to="loc_us-gaap_FinanceLeaseLiabilityPaymentsDue_5956dff1-5d86-47b9-b9c3-3c6ef999f3d6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_45873ad5-ed3f-49b9-96b6-fd61b51a0788" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_bbd65173-4132-4a9c-9dd9-50a73c92c580" xlink:to="loc_us-gaap_FinanceLeaseLiabilityUndiscountedExcessAmount_45873ad5-ed3f-49b9-96b6-fd61b51a0788" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinanceLeaseLiability_bdf07d6a-5795-4579-861b-a826bff3c16b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinanceLeaseLiability"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinanceLeaseLiabilitiesPaymentsDueAbstract_bbd65173-4132-4a9c-9dd9-50a73c92c580" xlink:to="loc_us-gaap_FinanceLeaseLiability_bdf07d6a-5795-4579-861b-a826bff3c16b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_LeasesMaturityAbstract_ca6bfb5d-6e3f-4af5-8c7f-a8fb0cc60f9c" xlink:href="aon-20201231.xsd#aon_LeasesMaturityAbstract"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LeasesAbstract_07fd7132-c02c-4043-a71b-8bd8042f209a" xlink:to="loc_aon_LeasesMaturityAbstract_ca6bfb5d-6e3f-4af5-8c7f-a8fb0cc60f9c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearOne_d8a3b9bc-08e3-4902-b19a-6983ff96e603" xlink:href="aon-20201231.xsd#aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearOne"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_ca6bfb5d-6e3f-4af5-8c7f-a8fb0cc60f9c" xlink:to="loc_aon_FinanceAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearOne_d8a3b9bc-08e3-4902-b19a-6983ff96e603" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo_dffef93c-cccf-4755-8127-d024a1fcaff8" xlink:href="aon-20201231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_ca6bfb5d-6e3f-4af5-8c7f-a8fb0cc60f9c" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearTwo_dffef93c-cccf-4755-8127-d024a1fcaff8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree_420f17a4-8e7c-40e5-823b-f5e6b5b9db53" xlink:href="aon-20201231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_ca6bfb5d-6e3f-4af5-8c7f-a8fb0cc60f9c" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearThree_420f17a4-8e7c-40e5-823b-f5e6b5b9db53" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour_30d6443c-27e0-46ad-9940-f182a165ee00" xlink:href="aon-20201231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_ca6bfb5d-6e3f-4af5-8c7f-a8fb0cc60f9c" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFour_30d6443c-27e0-46ad-9940-f182a165ee00" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive_d064ccaf-ce06-44cf-8c42-8bca47bae5a5" xlink:href="aon-20201231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_ca6bfb5d-6e3f-4af5-8c7f-a8fb0cc60f9c" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueYearFive_d064ccaf-ce06-44cf-8c42-8bca47bae5a5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueAfterYearFive_72830bd4-7605-49d6-86a9-2cd327d0679b" xlink:href="aon-20201231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueAfterYearFive"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_ca6bfb5d-6e3f-4af5-8c7f-a8fb0cc60f9c" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDueAfterYearFive_72830bd4-7605-49d6-86a9-2cd327d0679b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDue_89cb1a72-9232-4618-8c87-0fda8ca31f06" xlink:href="aon-20201231.xsd#aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDue"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_ca6bfb5d-6e3f-4af5-8c7f-a8fb0cc60f9c" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityPaymentsNetOfSubleaseIncomeDue_89cb1a72-9232-4618-8c87-0fda8ca31f06" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncomeUndiscountedExcessAmount_8a4b1a77-a3cd-4d8e-a930-c6c2513cbb4f" xlink:href="aon-20201231.xsd#aon_FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncomeUndiscountedExcessAmount"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_ca6bfb5d-6e3f-4af5-8c7f-a8fb0cc60f9c" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncomeUndiscountedExcessAmount_8a4b1a77-a3cd-4d8e-a930-c6c2513cbb4f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncome_325c7e44-5828-4fa2-a754-1a8eb7deb02c" xlink:href="aon-20201231.xsd#aon_FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncome"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_LeasesMaturityAbstract_ca6bfb5d-6e3f-4af5-8c7f-a8fb0cc60f9c" xlink:to="loc_aon_FinancingAndOperatingLeaseLiabilityNetOfSubleaseIncome_325c7e44-5828-4fa2-a754-1a8eb7deb02c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/IncomeTaxes" xlink:type="simple" xlink:href="aon-20201231.xsd#IncomeTaxes"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxes" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_31a1ef65-ec6b-47c8-b5a6-39801b21b6c5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureTextBlock_5543f2c0-1ee4-49ab-a095-2a4873c285d6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_31a1ef65-ec6b-47c8-b5a6-39801b21b6c5" xlink:to="loc_us-gaap_IncomeTaxDisclosureTextBlock_5543f2c0-1ee4-49ab-a095-2a4873c285d6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesTables" xlink:type="simple" xlink:href="aon-20201231.xsd#IncomeTaxesTables"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_50a20657-e795-4252-a59b-fd3f48a4cfd6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_96bf64a4-55d1-437a-8278-e23fbc1f8e51" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_50a20657-e795-4252-a59b-fd3f48a4cfd6" xlink:to="loc_us-gaap_ScheduleOfComponentsOfIncomeTaxExpenseBenefitTableTextBlock_96bf64a4-55d1-437a-8278-e23fbc1f8e51" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_29115a0d-ac9f-4912-bae2-b64712261705" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_50a20657-e795-4252-a59b-fd3f48a4cfd6" xlink:to="loc_us-gaap_ScheduleOfEffectiveIncomeTaxRateReconciliationTableTextBlock_29115a0d-ac9f-4912-bae2-b64712261705" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_5a4a0d62-6c78-4b59-bb6a-306eedbad08c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_50a20657-e795-4252-a59b-fd3f48a4cfd6" xlink:to="loc_us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock_5a4a0d62-6c78-4b59-bb6a-306eedbad08c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ScheduleOfDeferredTaxAssetsAndLiabilitiesNettedByJurisdictionTableTextBlock_21509e54-b27f-4877-bd03-4efe3abbefa6" xlink:href="aon-20201231.xsd#aon_ScheduleOfDeferredTaxAssetsAndLiabilitiesNettedByJurisdictionTableTextBlock"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_50a20657-e795-4252-a59b-fd3f48a4cfd6" xlink:to="loc_aon_ScheduleOfDeferredTaxAssetsAndLiabilitiesNettedByJurisdictionTableTextBlock_21509e54-b27f-4877-bd03-4efe3abbefa6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SummaryOfOperatingLossCarryforwardsTextBlock_cd65a5a5-d084-4906-9ad2-0da211c5ec7c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SummaryOfOperatingLossCarryforwardsTextBlock"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_50a20657-e795-4252-a59b-fd3f48a4cfd6" xlink:to="loc_us-gaap_SummaryOfOperatingLossCarryforwardsTextBlock_cd65a5a5-d084-4906-9ad2-0da211c5ec7c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SummaryOfIncomeTaxContingenciesTextBlock_d451f9e3-5823-4240-a8b7-68490f85b16b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SummaryOfIncomeTaxContingenciesTextBlock"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_50a20657-e795-4252-a59b-fd3f48a4cfd6" xlink:to="loc_us-gaap_SummaryOfIncomeTaxContingenciesTextBlock_d451f9e3-5823-4240-a8b7-68490f85b16b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesIncomefromcontinuingoperationsbeforeincometaxDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#IncomeTaxesIncomefromcontinuingoperationsbeforeincometaxDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesIncomefromcontinuingoperationsbeforeincometaxDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_e0b3d297-539c-4618-975f-9efb24f6a6d4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_IncomeTaxAuthorityTable_8a802e9c-05b5-4802-a4ef-d33c3549320f" xlink:href="aon-20201231.xsd#aon_IncomeTaxAuthorityTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_e0b3d297-539c-4618-975f-9efb24f6a6d4" xlink:to="loc_aon_IncomeTaxAuthorityTable_8a802e9c-05b5-4802-a4ef-d33c3549320f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_749f7479-0688-4634-8bff-7e894aa929ba" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_IncomeTaxAuthorityTable_8a802e9c-05b5-4802-a4ef-d33c3549320f" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_749f7479-0688-4634-8bff-7e894aa929ba" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_d77a62c4-d421-419f-b93a-c9a192362913" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_749f7479-0688-4634-8bff-7e894aa929ba" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_d77a62c4-d421-419f-b93a-c9a192362913" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IE_c1a073d2-5123-422c-934a-723c2fa757f5" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_IE"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_d77a62c4-d421-419f-b93a-c9a192362913" xlink:to="loc_country_IE_c1a073d2-5123-422c-934a-723c2fa757f5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_8d0c99e3-f183-4e9c-ba88-50c969292a1f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticCountryMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_d77a62c4-d421-419f-b93a-c9a192362913" xlink:to="loc_us-gaap_DomesticCountryMember_8d0c99e3-f183-4e9c-ba88-50c969292a1f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignCountryMember_3320af20-0aa8-4c30-8441-bd501f65e06d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignCountryMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_d77a62c4-d421-419f-b93a-c9a192362913" xlink:to="loc_us-gaap_ForeignCountryMember_3320af20-0aa8-4c30-8441-bd501f65e06d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_a2b3c904-5292-43d7-a890-72ecf9f9defb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_d77a62c4-d421-419f-b93a-c9a192362913" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_a2b3c904-5292-43d7-a890-72ecf9f9defb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherCountryMember_14dde4ae-d9be-441b-84b4-7ccde6baeedf" xlink:href="aon-20201231.xsd#aon_OtherCountryMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_d77a62c4-d421-419f-b93a-c9a192362913" xlink:to="loc_aon_OtherCountryMember_14dde4ae-d9be-441b-84b4-7ccde6baeedf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_IncomeTaxAuthorityLineItems_2b33d9c4-bd26-4c1d-831c-c28524874222" xlink:href="aon-20201231.xsd#aon_IncomeTaxAuthorityLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_IncomeTaxAuthorityTable_8a802e9c-05b5-4802-a4ef-d33c3549320f" xlink:to="loc_aon_IncomeTaxAuthorityLineItems_2b33d9c4-bd26-4c1d-831c-c28524874222" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAbstract_ccd68108-dab0-41f8-8b02-d85c88db0bb3" xlink:href="aon-20201231.xsd#aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_IncomeTaxAuthorityLineItems_2b33d9c4-bd26-4c1d-831c-c28524874222" xlink:to="loc_aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAbstract_ccd68108-dab0-41f8-8b02-d85c88db0bb3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_d5ff1776-214a-477d-bcd2-8df76960050e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_IncomeLossFromContinuingOperationsBeforeIncomeTaxesAbstract_ccd68108-dab0-41f8-8b02-d85c88db0bb3" xlink:to="loc_us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments_d5ff1776-214a-477d-bcd2-8df76960050e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_994247dc-3038-4aa8-a378-6cec018a400a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_IncomeTaxAuthorityLineItems_2b33d9c4-bd26-4c1d-831c-c28524874222" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_994247dc-3038-4aa8-a378-6cec018a400a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_32ef5078-3000-4527-9202-57db48d1beba" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_994247dc-3038-4aa8-a378-6cec018a400a" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_32ef5078-3000-4527-9202-57db48d1beba" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_b428ebdf-a4b3-4cc7-85c0-b06e42549061" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CurrentIncomeTaxExpenseBenefit"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CurrentIncomeTaxExpenseBenefitContinuingOperationsAbstract_32ef5078-3000-4527-9202-57db48d1beba" xlink:to="loc_us-gaap_CurrentIncomeTaxExpenseBenefit_b428ebdf-a4b3-4cc7-85c0-b06e42549061" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_8bfcb66e-5785-467b-836e-453df7f9d550" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_994247dc-3038-4aa8-a378-6cec018a400a" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_8bfcb66e-5785-467b-836e-453df7f9d550" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_6082becc-7443-4ba0-80df-b2bff36ebbae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxExpenseBenefit"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DeferredIncomeTaxExpenseBenefitContinuingOperationsAbstract_8bfcb66e-5785-467b-836e-453df7f9d550" xlink:to="loc_us-gaap_DeferredIncomeTaxExpenseBenefit_6082becc-7443-4ba0-80df-b2bff36ebbae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxExpenseBenefit_4ba0db7b-b3bb-4fa8-9bbe-5d9a38383683" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxExpenseBenefit"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract_994247dc-3038-4aa8-a378-6cec018a400a" xlink:to="loc_us-gaap_IncomeTaxExpenseBenefit_4ba0db7b-b3bb-4fa8-9bbe-5d9a38383683" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#IncomeTaxesNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_cfe66758-0e37-4b28-90dc-c6ece965877d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_f3a98b9f-6337-4219-9ace-99dd98800dc1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_cfe66758-0e37-4b28-90dc-c6ece965877d" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_f3a98b9f-6337-4219-9ace-99dd98800dc1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_fa38008f-faa2-4758-a1f8-3b4b7c59ded5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_cfe66758-0e37-4b28-90dc-c6ece965877d" xlink:to="loc_us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount_fa38008f-faa2-4758-a1f8-3b4b7c59ded5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_49860102-47cf-4c99-8f83-305550288609" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_cfe66758-0e37-4b28-90dc-c6ece965877d" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_49860102-47cf-4c99-8f83-305550288609" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_IncomeTaxHolidayIncomeTaxBenefits_a0eb3e6e-801d-4f52-9ffd-2e46a41d38f1" xlink:href="aon-20201231.xsd#aon_IncomeTaxHolidayIncomeTaxBenefits"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_cfe66758-0e37-4b28-90dc-c6ece965877d" xlink:to="loc_aon_IncomeTaxHolidayIncomeTaxBenefits_a0eb3e6e-801d-4f52-9ffd-2e46a41d38f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare_846499b4-6866-49f5-8abf-e5dffd0e39b6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_cfe66758-0e37-4b28-90dc-c6ece965877d" xlink:to="loc_us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare_846499b4-6866-49f5-8abf-e5dffd0e39b6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_26e5fee4-cdbc-4a96-a765-5c80474a316b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_cfe66758-0e37-4b28-90dc-c6ece965877d" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_26e5fee4-cdbc-4a96-a765-5c80474a316b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_e38abab8-8da7-4f2f-88e0-d98a74fcb4b3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_cfe66758-0e37-4b28-90dc-c6ece965877d" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense_e38abab8-8da7-4f2f-88e0-d98a74fcb4b3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_869b3c72-4cc6-4da8-930c-8d8bb68ec007" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_cfe66758-0e37-4b28-90dc-c6ece965877d" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_869b3c72-4cc6-4da8-930c-8d8bb68ec007" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesReconciliationoftheincometaxprovisionsbasedontheUSstatutorycorporatetaxratetotheprovisionsreflectedintheConsolidatedFinancialStatementsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#IncomeTaxesReconciliationoftheincometaxprovisionsbasedontheUSstatutorycorporatetaxratetotheprovisionsreflectedintheConsolidatedFinancialStatementsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesReconciliationoftheincometaxprovisionsbasedontheUSstatutorycorporatetaxratetotheprovisionsreflectedintheConsolidatedFinancialStatementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_a1f7093b-6d64-4a04-a10e-1d5044efc175" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_a1f7093b-6d64-4a04-a10e-1d5044efc175" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_d4a6385b-51fc-441f-8654-a0972dc7254f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate_d4a6385b-51fc-441f-8654-a0972dc7254f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_47d1e3e1-d663-4b5e-a477-4327ab88bfa0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes_47d1e3e1-d663-4b5e-a477-4327ab88bfa0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_624c86f3-b85c-4b64-ac2d-c027bf132d8f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationForeignIncomeTaxRateDifferential_624c86f3-b85c-4b64-ac2d-c027bf132d8f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense_59cec94c-6904-4673-ab6f-39a17cde027e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpense_59cec94c-6904-4673-ab6f-39a17cde027e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes_1bcefc65-568e-4172-823e-8f33f4d7dd0d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes_1bcefc65-568e-4172-823e-8f33f4d7dd0d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsIncludingStatutoryRateChangesPercent_00349845-4a6d-4822-b39d-9ee26d4ee821" xlink:href="aon-20201231.xsd#aon_EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsIncludingStatutoryRateChangesPercent"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_aon_EffectiveIncomeTaxRateReconciliationDeferredTaxAdjustmentsIncludingStatutoryRateChangesPercent_00349845-4a6d-4822-b39d-9ee26d4ee821" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings_3e67c240-8ef3-4f04-bc94-2604a9a45fc8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationRepatriationOfForeignEarnings_3e67c240-8ef3-4f04-bc94-2604a9a45fc8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_90b46cd4-e980-4b27-842a-bceebbad78d6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationChangeInDeferredTaxAssetsValuationAllowance_90b46cd4-e980-4b27-842a-bceebbad78d6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies_ad3bdc47-b715-4d8d-91e4-e4c5bf5d5d0c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxContingencies_ad3bdc47-b715-4d8d-91e4-e4c5bf5d5d0c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_117b2919-421c-4eda-a622-154cb496f6f8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost_117b2919-421c-4eda-a622-154cb496f6f8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent_399f1e89-e193-4550-8ba7-6095af763139" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Percent_399f1e89-e193-4550-8ba7-6095af763139" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness_adc8a09c-31d5-4666-bb1a-4b7c083cc933" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationDispositionOfBusiness_adc8a09c-31d5-4666-bb1a-4b7c083cc933" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_EffectiveIncomeTaxRateReconciliationCapitalLossesPercent_24c9322f-a10d-4b20-929b-3381acba7d0d" xlink:href="aon-20201231.xsd#aon_EffectiveIncomeTaxRateReconciliationCapitalLossesPercent"/>
    <link:presentationArc order="13" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_aon_EffectiveIncomeTaxRateReconciliationCapitalLossesPercent_24c9322f-a10d-4b20-929b-3381acba7d0d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCostsPercent_fc9b39df-57ea-4816-a838-38f6ac28ae02" xlink:href="aon-20201231.xsd#aon_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCostsPercent"/>
    <link:presentationArc order="14" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_aon_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseTransactionCostsPercent_fc9b39df-57ea-4816-a838-38f6ac28ae02" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_1a8b2284-1707-4f97-a829-d93869b435f0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments"/>
    <link:presentationArc order="15" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments_1a8b2284-1707-4f97-a829-d93869b435f0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_8f6547fd-ae3f-4660-8cd6-a1baa58ac01b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EffectiveIncomeTaxRateContinuingOperations"/>
    <link:presentationArc order="16" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperationsTaxRateReconciliationAbstract_e24bfe94-6bde-4300-8f92-0c7ecd016737" xlink:to="loc_us-gaap_EffectiveIncomeTaxRateContinuingOperations_8f6547fd-ae3f-4660-8cd6-a1baa58ac01b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesComponentsofAonsdeferredtaxassetsandliabilitiesDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#IncomeTaxesComponentsofAonsdeferredtaxassetsandliabilitiesDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesComponentsofAonsdeferredtaxassetsandliabilitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_246c49cb-a6fa-42d9-8eae-480014c9d3fe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract_116fd43e-cde0-4e34-9bb1-cca65b8bfe45" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_246c49cb-a6fa-42d9-8eae-480014c9d3fe" xlink:to="loc_us-gaap_ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract_116fd43e-cde0-4e34-9bb1-cca65b8bfe45" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_81e150c9-bfa2-4e96-89c7-ad58d8df037e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComponentsOfDeferredTaxAssetsAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract_116fd43e-cde0-4e34-9bb1-cca65b8bfe45" xlink:to="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_81e150c9-bfa2-4e96-89c7-ad58d8df037e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards_002d5b5a-2b78-40ca-997b-10c68c81a963" xlink:href="aon-20201231.xsd#aon_DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_81e150c9-bfa2-4e96-89c7-ad58d8df037e" xlink:to="loc_aon_DeferredTaxAssetsNetOperatingAndCapitalLossCarryforwardsAndTaxCreditCarryforwards_002d5b5a-2b78-40ca-997b-10c68c81a963" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits_02d1288a-12e0-4dec-856d-f7e9ce217ce2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_81e150c9-bfa2-4e96-89c7-ad58d8df037e" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits_02d1288a-12e0-4dec-856d-f7e9ce217ce2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DeferredTaxAssetsLeaseLiability_46d8026d-f4ab-458b-9825-4a3cd65ad160" xlink:href="aon-20201231.xsd#aon_DeferredTaxAssetsLeaseLiability"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_81e150c9-bfa2-4e96-89c7-ad58d8df037e" xlink:to="loc_aon_DeferredTaxAssetsLeaseLiability_46d8026d-f4ab-458b-9825-4a3cd65ad160" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_332b3590-befb-430d-a9f9-6033eb02e65e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_81e150c9-bfa2-4e96-89c7-ad58d8df037e" xlink:to="loc_us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsOther_332b3590-befb-430d-a9f9-6033eb02e65e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsDeferredIncome_74a64d3c-293f-4f48-b3d4-58f69e36c7b8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsDeferredIncome"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_81e150c9-bfa2-4e96-89c7-ad58d8df037e" xlink:to="loc_us-gaap_DeferredTaxAssetsDeferredIncome_74a64d3c-293f-4f48-b3d4-58f69e36c7b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsInvestments_7e9a7094-8f2e-4577-b47f-e3c874421648" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsInvestments"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_81e150c9-bfa2-4e96-89c7-ad58d8df037e" xlink:to="loc_us-gaap_DeferredTaxAssetsInvestments_7e9a7094-8f2e-4577-b47f-e3c874421648" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DeferredTaxAssetsLeaseGuarantees_bcc524d0-ed8c-468e-8f73-11e6eed91004" xlink:href="aon-20201231.xsd#aon_DeferredTaxAssetsLeaseGuarantees"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_81e150c9-bfa2-4e96-89c7-ad58d8df037e" xlink:to="loc_aon_DeferredTaxAssetsLeaseGuarantees_bcc524d0-ed8c-468e-8f73-11e6eed91004" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DeferredTaxAssetsAccruedInterest_662fed33-0d3b-4193-bcd4-9fff513eb0d2" xlink:href="aon-20201231.xsd#aon_DeferredTaxAssetsAccruedInterest"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_81e150c9-bfa2-4e96-89c7-ad58d8df037e" xlink:to="loc_aon_DeferredTaxAssetsAccruedInterest_662fed33-0d3b-4193-bcd4-9fff513eb0d2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsOther_2760eeff-6263-4135-a9de-34bf45b533d2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsOther"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_81e150c9-bfa2-4e96-89c7-ad58d8df037e" xlink:to="loc_us-gaap_DeferredTaxAssetsOther_2760eeff-6263-4135-a9de-34bf45b533d2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsGross_79a873ca-a792-48d5-861b-cdb8fde973dd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsGross"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_81e150c9-bfa2-4e96-89c7-ad58d8df037e" xlink:to="loc_us-gaap_DeferredTaxAssetsGross_79a873ca-a792-48d5-861b-cdb8fde973dd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsValuationAllowance_9ff996da-e474-4212-b335-64867eaff025" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsValuationAllowance"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_81e150c9-bfa2-4e96-89c7-ad58d8df037e" xlink:to="loc_us-gaap_DeferredTaxAssetsValuationAllowance_9ff996da-e474-4212-b335-64867eaff025" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsNet_1ec94ce6-3c78-4065-a114-73c0b81d271c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsNet"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAbstract_81e150c9-bfa2-4e96-89c7-ad58d8df037e" xlink:to="loc_us-gaap_DeferredTaxAssetsNet_1ec94ce6-3c78-4065-a114-73c0b81d271c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_66158d61-e356-409c-8cc2-5601475b5981" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract_116fd43e-cde0-4e34-9bb1-cca65b8bfe45" xlink:to="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_66158d61-e356-409c-8cc2-5601475b5981" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment_0cc53ce9-2b40-4238-98ed-f7c80fd92c0f" xlink:href="aon-20201231.xsd#aon_DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_66158d61-e356-409c-8cc2-5601475b5981" xlink:to="loc_aon_DeferredTaxLiabilitiesIntangibleAssetsAndPropertyPlantAndEquipment_0cc53ce9-2b40-4238-98ed-f7c80fd92c0f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DeferredTaxLiabilitiesLeaseRightofUseAsset_076c6016-e41b-422a-997f-7a0f5f9eb15c" xlink:href="aon-20201231.xsd#aon_DeferredTaxLiabilitiesLeaseRightofUseAsset"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_66158d61-e356-409c-8cc2-5601475b5981" xlink:to="loc_aon_DeferredTaxLiabilitiesLeaseRightofUseAsset_076c6016-e41b-422a-997f-7a0f5f9eb15c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome_eaa770e0-3e1c-4517-b85f-6d83ec1968b6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_66158d61-e356-409c-8cc2-5601475b5981" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesTaxDeferredIncome_eaa770e0-3e1c-4517-b85f-6d83ec1968b6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_d4054517-44ed-4c87-8486-b839923ae703" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_66158d61-e356-409c-8cc2-5601475b5981" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings_d4054517-44ed-4c87-8486-b839923ae703" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains_889901c7-cfb6-47e6-89ce-b077cf5e5f87" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_66158d61-e356-409c-8cc2-5601475b5981" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesUnrealizedCurrencyTransactionGains_889901c7-cfb6-47e6-89ce-b077cf5e5f87" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DeferredTaxLiabilitiesOtherAccruedExpenses_a93c9c04-5e12-4fc5-9ae1-ef73c965c311" xlink:href="aon-20201231.xsd#aon_DeferredTaxLiabilitiesOtherAccruedExpenses"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_66158d61-e356-409c-8cc2-5601475b5981" xlink:to="loc_aon_DeferredTaxLiabilitiesOtherAccruedExpenses_a93c9c04-5e12-4fc5-9ae1-ef73c965c311" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilitiesOther_714b9d3c-eb65-498a-8c47-8897b1e1e81a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilitiesOther"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_66158d61-e356-409c-8cc2-5601475b5981" xlink:to="loc_us-gaap_DeferredTaxLiabilitiesOther_714b9d3c-eb65-498a-8c47-8897b1e1e81a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxLiabilities_eff6826a-f51a-48a5-9bd8-c61821a27717" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxLiabilities"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxLiabilitiesAbstract_66158d61-e356-409c-8cc2-5601475b5981" xlink:to="loc_us-gaap_DeferredTaxLiabilities_eff6826a-f51a-48a5-9bd8-c61821a27717" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_5c8ac4af-ce3f-4bd9-bcbb-3afeb9af9bd4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ComponentsOfDeferredTaxAssetsAndLiabilitiesAbstract_116fd43e-cde0-4e34-9bb1-cca65b8bfe45" xlink:to="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_5c8ac4af-ce3f-4bd9-bcbb-3afeb9af9bd4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesDeferredincometaxesassetsandliabilitiesnettedbyjurisdictionasclassifiedintheConsolidatedStatementsofFinancialPositionDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#IncomeTaxesDeferredincometaxesassetsandliabilitiesnettedbyjurisdictionasclassifiedintheConsolidatedStatementsofFinancialPositionDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesDeferredincometaxesassetsandliabilitiesnettedbyjurisdictionasclassifiedintheConsolidatedStatementsofFinancialPositionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_257e00fe-4c57-444e-8eae-0bfc83f410ce" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxAssetsNet_b8effdb6-42a2-44c9-9512-7e640e2054eb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxAssetsNet"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_257e00fe-4c57-444e-8eae-0bfc83f410ce" xlink:to="loc_us-gaap_DeferredIncomeTaxAssetsNet_b8effdb6-42a2-44c9-9512-7e640e2054eb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_3606cefb-7a48-494f-9031-f98c894c78b7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_257e00fe-4c57-444e-8eae-0bfc83f410ce" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_3606cefb-7a48-494f-9031-f98c894c78b7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_85bf1946-066e-4383-90ad-bdb57e872d5e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DeferredTaxAssetsLiabilitiesNet"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_257e00fe-4c57-444e-8eae-0bfc83f410ce" xlink:to="loc_us-gaap_DeferredTaxAssetsLiabilitiesNet_85bf1946-066e-4383-90ad-bdb57e872d5e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesOperatingLossCarryforwardsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#IncomeTaxesOperatingLossCarryforwardsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesOperatingLossCarryforwardsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_7c2d8505-a511-47d8-8f6b-9b39aedc9530" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsTable_ab2fba33-3a5b-4046-af19-d9c0b0a6d01c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLossCarryforwardsTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_7c2d8505-a511-47d8-8f6b-9b39aedc9530" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_ab2fba33-3a5b-4046-af19-d9c0b0a6d01c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_53a0f8f6-d18b-445f-8ac6-aa8b62ab88f5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_ab2fba33-3a5b-4046-af19-d9c0b0a6d01c" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_53a0f8f6-d18b-445f-8ac6-aa8b62ab88f5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_8c116a05-34b9-47f7-8da6-d701d9e6e6ef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_53a0f8f6-d18b-445f-8ac6-aa8b62ab88f5" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_8c116a05-34b9-47f7-8da6-d701d9e6e6ef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_6edb6d94-d6e3-4e46-923c-6098b33d3d97" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticCountryMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_8c116a05-34b9-47f7-8da6-d701d9e6e6ef" xlink:to="loc_us-gaap_DomesticCountryMember_6edb6d94-d6e3-4e46-923c-6098b33d3d97" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InternalRevenueServiceIRSMember_a8123542-61d4-4941-8d04-dcc2951325d3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InternalRevenueServiceIRSMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_8c116a05-34b9-47f7-8da6-d701d9e6e6ef" xlink:to="loc_us-gaap_InternalRevenueServiceIRSMember_a8123542-61d4-4941-8d04-dcc2951325d3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_40f4458f-8fce-42c3-a86b-b70a8fe73701" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_8c116a05-34b9-47f7-8da6-d701d9e6e6ef" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_40f4458f-8fce-42c3-a86b-b70a8fe73701" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherCountryMember_652461de-240f-415a-b85d-72c1a6e8dd1e" xlink:href="aon-20201231.xsd#aon_OtherCountryMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_8c116a05-34b9-47f7-8da6-d701d9e6e6ef" xlink:to="loc_aon_OtherCountryMember_652461de-240f-415a-b85d-72c1a6e8dd1e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsLineItems_511d9a9f-3681-468c-b8b0-d3ae750b804b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLossCarryforwardsLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_ab2fba33-3a5b-4046-af19-d9c0b0a6d01c" xlink:to="loc_us-gaap_OperatingLossCarryforwardsLineItems_511d9a9f-3681-468c-b8b0-d3ae750b804b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_fd9f14aa-8165-4027-bea9-2cdd597a238d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_511d9a9f-3681-468c-b8b0-d3ae750b804b" xlink:to="loc_us-gaap_OperatingLossCarryforwards_fd9f14aa-8165-4027-bea9-2cdd597a238d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CapitalLossCarryforwards_0141769f-04bb-4c29-bfa4-52f5013f5cfa" xlink:href="aon-20201231.xsd#aon_CapitalLossCarryforwards"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_511d9a9f-3681-468c-b8b0-d3ae750b804b" xlink:to="loc_aon_CapitalLossCarryforwards_0141769f-04bb-4c29-bfa4-52f5013f5cfa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_InterestCarryforward_3496fc75-d36b-45c5-8826-45f8bdc7fef2" xlink:href="aon-20201231.xsd#aon_InterestCarryforward"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_511d9a9f-3681-468c-b8b0-d3ae750b804b" xlink:to="loc_aon_InterestCarryforward_3496fc75-d36b-45c5-8826-45f8bdc7fef2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/IncomeTaxesReconciliationofthebeginningandendingamountofunrecognizedtaxbenefitsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#IncomeTaxesReconciliationofthebeginningandendingamountofunrecognizedtaxbenefitsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/IncomeTaxesReconciliationofthebeginningandendingamountofunrecognizedtaxbenefitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxDisclosureAbstract_491ce722-a12c-4978-ba6f-d1883c6f7d7f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeTaxDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_3b90d0e9-e587-47a4-a6ec-5b8d287265e1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeTaxDisclosureAbstract_491ce722-a12c-4978-ba6f-d1883c6f7d7f" xlink:to="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_3b90d0e9-e587-47a4-a6ec-5b8d287265e1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_ee6a96ee-ec05-414e-8d59-fd440854cced" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefits"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_3b90d0e9-e587-47a4-a6ec-5b8d287265e1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_ee6a96ee-ec05-414e-8d59-fd440854cced" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_d9bd89e4-63a6-4e54-9b5b-174898bb6cba" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_3b90d0e9-e587-47a4-a6ec-5b8d287265e1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions_d9bd89e4-63a6-4e54-9b5b-174898bb6cba" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_30eb104a-794a-4407-a15a-aebffd3d50f8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_3b90d0e9-e587-47a4-a6ec-5b8d287265e1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions_30eb104a-794a-4407-a15a-aebffd3d50f8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_e461fa4b-65ac-4b79-b0cb-967dc5ffb389" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_3b90d0e9-e587-47a4-a6ec-5b8d287265e1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions_e461fa4b-65ac-4b79-b0cb-967dc5ffb389" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_32f5e12f-2eb3-4722-8bcc-de7f4902f920" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_3b90d0e9-e587-47a4-a6ec-5b8d287265e1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities_32f5e12f-2eb3-4722-8bcc-de7f4902f920" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition_689014bb-1d75-4f76-ac10-de624fa302e1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_3b90d0e9-e587-47a4-a6ec-5b8d287265e1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition_689014bb-1d75-4f76-ac10-de624fa302e1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_803da5e3-5c51-48ff-b11b-a06b96e2c8e8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_3b90d0e9-e587-47a4-a6ec-5b8d287265e1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations_803da5e3-5c51-48ff-b11b-a06b96e2c8e8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation_ce2af54a-dac2-4dbc-8323-e25790fb93fb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_3b90d0e9-e587-47a4-a6ec-5b8d287265e1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromForeignCurrencyTranslation_ce2af54a-dac2-4dbc-8323-e25790fb93fb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefits_a5ed2730-be37-43f5-a738-51df27592ca0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_UnrecognizedTaxBenefits"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ReconciliationOfUnrecognizedTaxBenefitsExcludingAmountsPertainingToExaminedTaxReturnsRollForward_3b90d0e9-e587-47a4-a6ec-5b8d287265e1" xlink:to="loc_us-gaap_UnrecognizedTaxBenefits_a5ed2730-be37-43f5-a738-51df27592ca0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ShareholdersEquity" xlink:type="simple" xlink:href="aon-20201231.xsd#ShareholdersEquity"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ShareholdersEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_cda8a087-f52c-4dea-a9cf-25a97409da7c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareholdersEquityAndShareBasedPaymentsTextBlock_c441e1a0-a2fa-4ea2-aa40-986501874a14" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareholdersEquityAndShareBasedPaymentsTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_cda8a087-f52c-4dea-a9cf-25a97409da7c" xlink:to="loc_us-gaap_ShareholdersEquityAndShareBasedPaymentsTextBlock_c441e1a0-a2fa-4ea2-aa40-986501874a14" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ShareholdersEquityTables" xlink:type="simple" xlink:href="aon-20201231.xsd#ShareholdersEquityTables"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ShareholdersEquityTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_8f769ec1-1d6a-4734-9808-49aba34ffdad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRepurchaseAgreements_850033e7-fef0-4744-94f7-481dd6fed537" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfRepurchaseAgreements"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_8f769ec1-1d6a-4734-9808-49aba34ffdad" xlink:to="loc_us-gaap_ScheduleOfRepurchaseAgreements_850033e7-fef0-4744-94f7-481dd6fed537" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock_a9d26310-e662-4bd7-8eb7-52c005b3cfee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_8f769ec1-1d6a-4734-9808-49aba34ffdad" xlink:to="loc_us-gaap_ScheduleOfWeightedAverageNumberOfSharesTableTextBlock_a9d26310-e662-4bd7-8eb7-52c005b3cfee" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_d3e5d8c0-798a-41fc-a439-05acf51ba7a4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_8f769ec1-1d6a-4734-9808-49aba34ffdad" xlink:to="loc_us-gaap_ScheduleOfAccumulatedOtherComprehensiveIncomeLossTableTextBlock_d3e5d8c0-798a-41fc-a439-05acf51ba7a4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ShareholdersEquityDistributableReservesNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#ShareholdersEquityDistributableReservesNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ShareholdersEquityDistributableReservesNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_6288c1f3-e706-45b1-9d8d-6a0c0cb9d616" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DistributableReservesAvailableAmount_829fd1fa-9709-4ab6-9fda-703fc0ad4ced" xlink:href="aon-20201231.xsd#aon_DistributableReservesAvailableAmount"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_6288c1f3-e706-45b1-9d8d-6a0c0cb9d616" xlink:to="loc_aon_DistributableReservesAvailableAmount_829fd1fa-9709-4ab6-9fda-703fc0ad4ced" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ShareholdersEquityOrdinarySharesDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#ShareholdersEquityOrdinarySharesDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ShareholdersEquityOrdinarySharesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_952c1c0c-c6a9-4b15-8aff-a39c9bacd4cd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_OrdinaryShareProgramsTable_8d4c1991-97ac-4d9d-8572-fd55a3189bf2" xlink:href="aon-20201231.xsd#aon_OrdinaryShareProgramsTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_952c1c0c-c6a9-4b15-8aff-a39c9bacd4cd" xlink:to="loc_aon_OrdinaryShareProgramsTable_8d4c1991-97ac-4d9d-8572-fd55a3189bf2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_1dcbf9f4-bcdb-49a2-bff7-5c3fbfbf8c0b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareRepurchaseProgramAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OrdinaryShareProgramsTable_8d4c1991-97ac-4d9d-8572-fd55a3189bf2" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_1dcbf9f4-bcdb-49a2-bff7-5c3fbfbf8c0b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_71831596-0342-4845-bcd4-4230fef87ca9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_1dcbf9f4-bcdb-49a2-bff7-5c3fbfbf8c0b" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_71831596-0342-4845-bcd4-4230fef87ca9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ShareRepurchaseProgramOf2012Member_97503e60-da69-44b9-8e2e-ded78ef941cb" xlink:href="aon-20201231.xsd#aon_ShareRepurchaseProgramOf2012Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_71831596-0342-4845-bcd4-4230fef87ca9" xlink:to="loc_aon_ShareRepurchaseProgramOf2012Member_97503e60-da69-44b9-8e2e-ded78ef941cb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ShareRepurchaseProgramof2014Member_e3109e1b-ec33-4432-aa3b-3fc3057c5573" xlink:href="aon-20201231.xsd#aon_ShareRepurchaseProgramof2014Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_71831596-0342-4845-bcd4-4230fef87ca9" xlink:to="loc_aon_ShareRepurchaseProgramof2014Member_e3109e1b-ec33-4432-aa3b-3fc3057c5573" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ShareRepurchaseProgramOf2017Member_08b15c22-90fd-42d5-8b77-32989026f53e" xlink:href="aon-20201231.xsd#aon_ShareRepurchaseProgramOf2017Member"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_71831596-0342-4845-bcd4-4230fef87ca9" xlink:to="loc_aon_ShareRepurchaseProgramOf2017Member_08b15c22-90fd-42d5-8b77-32989026f53e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CommonStockProgramsLineItems_66df0ac3-5542-4953-abd5-bc541e9aaf72" xlink:href="aon-20201231.xsd#aon_CommonStockProgramsLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_OrdinaryShareProgramsTable_8d4c1991-97ac-4d9d-8572-fd55a3189bf2" xlink:to="loc_aon_CommonStockProgramsLineItems_66df0ac3-5542-4953-abd5-bc541e9aaf72" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_48be3efd-0250-4083-8a56-51c585ce66b1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CommonStockProgramsLineItems_66df0ac3-5542-4953-abd5-bc541e9aaf72" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_48be3efd-0250-4083-8a56-51c585ce66b1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_b3cda861-84e3-4e09-bb47-60ac0101e38b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CommonStockProgramsLineItems_66df0ac3-5542-4953-abd5-bc541e9aaf72" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_b3cda861-84e3-4e09-bb47-60ac0101e38b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_8ac632f9-e062-4ae1-83af-8eff12b825ad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockAcquiredAverageCostPerShare"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CommonStockProgramsLineItems_66df0ac3-5542-4953-abd5-bc541e9aaf72" xlink:to="loc_us-gaap_TreasuryStockAcquiredAverageCostPerShare_8ac632f9-e062-4ae1-83af-8eff12b825ad" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRepurchaseOfEquityAbstract_b0b70562-6c6b-4b4c-b032-5090ed94ef1f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PaymentsForRepurchaseOfEquityAbstract"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CommonStockProgramsLineItems_66df0ac3-5542-4953-abd5-bc541e9aaf72" xlink:to="loc_us-gaap_PaymentsForRepurchaseOfEquityAbstract_b0b70562-6c6b-4b4c-b032-5090ed94ef1f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_28a8ebd4-c99e-44bb-99cd-0147a3e98458" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TreasuryStockValueAcquiredCostMethod"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PaymentsForRepurchaseOfEquityAbstract_b0b70562-6c6b-4b4c-b032-5090ed94ef1f" xlink:to="loc_us-gaap_TreasuryStockValueAcquiredCostMethod_28a8ebd4-c99e-44bb-99cd-0147a3e98458" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TreasuryStockAcquiredAdditionalTransactionCosts_862ba31d-40f2-42c2-8428-e7c984bce322" xlink:href="aon-20201231.xsd#aon_TreasuryStockAcquiredAdditionalTransactionCosts"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PaymentsForRepurchaseOfEquityAbstract_b0b70562-6c6b-4b4c-b032-5090ed94ef1f" xlink:to="loc_aon_TreasuryStockAcquiredAdditionalTransactionCosts_862ba31d-40f2-42c2-8428-e7c984bce322" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TreasuryStockValueAcquiredCostMethodIncludingAssociatedAcquisitionCosts_377daa97-f8be-4b5b-be88-026824422565" xlink:href="aon-20201231.xsd#aon_TreasuryStockValueAcquiredCostMethodIncludingAssociatedAcquisitionCosts"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PaymentsForRepurchaseOfEquityAbstract_b0b70562-6c6b-4b4c-b032-5090ed94ef1f" xlink:to="loc_aon_TreasuryStockValueAcquiredCostMethodIncludingAssociatedAcquisitionCosts_377daa97-f8be-4b5b-be88-026824422565" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_1dcf1536-f703-4504-8378-6312717b0117" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_CommonStockProgramsLineItems_66df0ac3-5542-4953-abd5-bc541e9aaf72" xlink:to="loc_us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1_1dcf1536-f703-4504-8378-6312717b0117" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ShareholdersEquityScheduleofweightedaveragesharesoutstandingDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#ShareholdersEquityScheduleofweightedaveragesharesoutstandingDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ShareholdersEquityScheduleofweightedaveragesharesoutstandingDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_cc8a8550-357a-4d3c-a455-885d57a164e8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_8b0b7a6b-add5-4921-a821-f5d724e6b750" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfSharesOutstandingBasic"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_cc8a8550-357a-4d3c-a455-885d57a164e8" xlink:to="loc_us-gaap_WeightedAverageNumberOfSharesOutstandingBasic_8b0b7a6b-add5-4921-a821-f5d724e6b750" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_76a8f8ab-b8ff-420a-9cec-5962c4987a9c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_cc8a8550-357a-4d3c-a455-885d57a164e8" xlink:to="loc_us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements_76a8f8ab-b8ff-420a-9cec-5962c4987a9c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_4665380a-a349-478a-8e16-a052d7c728f2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_cc8a8550-357a-4d3c-a455-885d57a164e8" xlink:to="loc_us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding_4665380a-a349-478a-8e16-a052d7c728f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c11cb8db-fba8-422b-a398-0633941772da" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_cc8a8550-357a-4d3c-a455-885d57a164e8" xlink:to="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount_c11cb8db-fba8-422b-a398-0633941772da" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ShareholdersEquityComponentsofAccumulatedothercomprehensivelossnetofrelatedtaxDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#ShareholdersEquityComponentsofAccumulatedothercomprehensivelossnetofrelatedtaxDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ShareholdersEquityComponentsofAccumulatedothercomprehensivelossnetofrelatedtaxDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityAbstract_c66246d7-5748-4b77-beb1-868994c579b4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_defcda70-d84f-4cc9-8f78-6eb1dea65207" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityAbstract_c66246d7-5748-4b77-beb1-868994c579b4" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_defcda70-d84f-4cc9-8f78-6eb1dea65207" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_4b3fae58-2f68-439e-94f6-1f83852f022a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_defcda70-d84f-4cc9-8f78-6eb1dea65207" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_4b3fae58-2f68-439e-94f6-1f83852f022a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_ab21ae7a-4761-413c-8028-155fc7f797fe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquityComponentDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_4b3fae58-2f68-439e-94f6-1f83852f022a" xlink:to="loc_us-gaap_EquityComponentDomain_ab21ae7a-4761-413c-8028-155fc7f797fe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_fcedc020-d48b-41a3-97b3-e9172f50f1a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_ab21ae7a-4761-413c-8028-155fc7f797fe" xlink:to="loc_us-gaap_AccumulatedNetUnrealizedInvestmentGainLossMember_fcedc020-d48b-41a3-97b3-e9172f50f1a9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_b4520171-de9a-4a49-a6a2-b574d96f38e2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_ab21ae7a-4761-413c-8028-155fc7f797fe" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_b4520171-de9a-4a49-a6a2-b574d96f38e2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_2aaa55f5-e7bf-4730-b087-7314c1d04d6b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_ab21ae7a-4761-413c-8028-155fc7f797fe" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentMember_2aaa55f5-e7bf-4730-b087-7314c1d04d6b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_b1d3d801-9af1-4511-b4e5-76344b4ab1b1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquityComponentDomain_ab21ae7a-4761-413c-8028-155fc7f797fe" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_b1d3d801-9af1-4511-b4e5-76344b4ab1b1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_71643113-db1f-4a2e-9394-39435a68189f" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_defcda70-d84f-4cc9-8f78-6eb1dea65207" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_71643113-db1f-4a2e-9394-39435a68189f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_8b4977ed-7133-4cd7-9c50-946de45a664d" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_71643113-db1f-4a2e-9394-39435a68189f" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_8b4977ed-7133-4cd7-9c50-946de45a664d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_e53049c3-647c-4ef3-8a9a-d664aef7ebbe" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_8b4977ed-7133-4cd7-9c50-946de45a664d" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_e53049c3-647c-4ef3-8a9a-d664aef7ebbe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember_6beb72f7-f481-4c2d-b9de-581f71eb2706" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_8b4977ed-7133-4cd7-9c50-946de45a664d" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustedBalanceMember_6beb72f7-f481-4c2d-b9de-581f71eb2706" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_ec532bed-e94b-4c99-9ad3-b26e9dd8c2c7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_defcda70-d84f-4cc9-8f78-6eb1dea65207" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_ec532bed-e94b-4c99-9ad3-b26e9dd8c2c7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_3fb19253-62a3-4089-b988-0aee46bc1851" xlink:href="aon-20201231.xsd#aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_ec532bed-e94b-4c99-9ad3-b26e9dd8c2c7" xlink:to="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_3fb19253-62a3-4089-b988-0aee46bc1851" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_ae7c0099-da67-4655-8c0d-0aff162f3e80" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_3fb19253-62a3-4089-b988-0aee46bc1851" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_ae7c0099-da67-4655-8c0d-0aff162f3e80" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_da9f9807-ad35-48c1-adae-1c0fdee59c3d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_3fb19253-62a3-4089-b988-0aee46bc1851" xlink:to="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_da9f9807-ad35-48c1-adae-1c0fdee59c3d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_6fc88b37-8797-4595-a575-01e409bf4461" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_3fb19253-62a3-4089-b988-0aee46bc1851" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsTax_6fc88b37-8797-4595-a575-01e409bf4461" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_7403f03f-aee4-4342-9de1-c41f589eaa88" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_3fb19253-62a3-4089-b988-0aee46bc1851" xlink:to="loc_us-gaap_OciBeforeReclassificationsNetOfTaxAttributableToParent_7403f03f-aee4-4342-9de1-c41f589eaa88" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_50040636-bce4-402d-a497-ce1d2a443652" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_3fb19253-62a3-4089-b988-0aee46bc1851" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_50040636-bce4-402d-a497-ce1d2a443652" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_74954f91-a636-4ab9-81fc-829ca632bdc3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodTax"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_3fb19253-62a3-4089-b988-0aee46bc1851" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodTax_74954f91-a636-4ab9-81fc-829ca632bdc3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_9f7ac161-614b-4b93-906b-5aaf5e0ebc33" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_3fb19253-62a3-4089-b988-0aee46bc1851" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodNetOfTaxAttributableToParent_9f7ac161-614b-4b93-906b-5aaf5e0ebc33" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTotalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_5da93d21-a3fd-4c8e-b953-a42b5cc8c55a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_3fb19253-62a3-4089-b988-0aee46bc1851" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_5da93d21-a3fd-4c8e-b953-a42b5cc8c55a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_6a6cffda-01ff-4739-b196-1ef130fe75a5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_aon_ChangesInAccumulatedOtherComprehensiveIncomeLossRollForward_3fb19253-62a3-4089-b988-0aee46bc1851" xlink:to="loc_us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest_6a6cffda-01ff-4739-b196-1ef130fe75a5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefits" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefits"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefits" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_49ecd5e3-a4eb-4d27-be96-4b8eb9a37bb1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_64cb8068-9d3d-463e-a951-b8d42982d241" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_49ecd5e3-a4eb-4d27-be96-4b8eb9a37bb1" xlink:to="loc_us-gaap_PensionAndOtherPostretirementBenefitsDisclosureTextBlock_64cb8068-9d3d-463e-a951-b8d42982d241" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsTables" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsTables"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_30998978-90ad-4cfe-8e5a-3c795306ac40" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCostsOfRetirementPlansTableTextBlock_34a087bd-875f-4dc0-a84f-e437cf37672d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfCostsOfRetirementPlansTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_30998978-90ad-4cfe-8e5a-3c795306ac40" xlink:to="loc_us-gaap_ScheduleOfCostsOfRetirementPlansTableTextBlock_34a087bd-875f-4dc0-a84f-e437cf37672d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ChangesInProjectedBenefitObligationsFairValueOfPlanAssetsAndFundedStatusOfPlanTableTextBlock_f6ef7a00-85b0-426a-be8a-aa5781c0ce37" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ChangesInProjectedBenefitObligationsFairValueOfPlanAssetsAndFundedStatusOfPlanTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_30998978-90ad-4cfe-8e5a-3c795306ac40" xlink:to="loc_us-gaap_ChangesInProjectedBenefitObligationsFairValueOfPlanAssetsAndFundedStatusOfPlanTableTextBlock_f6ef7a00-85b0-426a-be8a-aa5781c0ce37" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock_48d75c6d-7425-4870-a657-22e8c3c125ad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_30998978-90ad-4cfe-8e5a-3c795306ac40" xlink:to="loc_us-gaap_ScheduleOfAmountsRecognizedInBalanceSheetTableTextBlock_48d75c6d-7425-4870-a657-22e8c3c125ad" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfNetPeriodicBenefitCostNotYetRecognizedTableTextBlock_5743f925-4696-4df8-a7c2-efeaf4fb96d8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfNetPeriodicBenefitCostNotYetRecognizedTableTextBlock"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_30998978-90ad-4cfe-8e5a-3c795306ac40" xlink:to="loc_us-gaap_ScheduleOfNetPeriodicBenefitCostNotYetRecognizedTableTextBlock_5743f925-4696-4df8-a7c2-efeaf4fb96d8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_8e1bcecd-4814-4db8-86d9-4ad05dfd80e9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfNetBenefitCostsTableTextBlock"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_30998978-90ad-4cfe-8e5a-3c795306ac40" xlink:to="loc_us-gaap_ScheduleOfNetBenefitCostsTableTextBlock_8e1bcecd-4814-4db8-86d9-4ad05dfd80e9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAssumptionsUsedTableTextBlock_d88f7fc7-02c0-4ea4-b126-536784ef7709" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfAssumptionsUsedTableTextBlock"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_30998978-90ad-4cfe-8e5a-3c795306ac40" xlink:to="loc_us-gaap_ScheduleOfAssumptionsUsedTableTextBlock_d88f7fc7-02c0-4ea4-b126-536784ef7709" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfChangesInFairValueOfPlanAssetsTableTextBlock_7e633da9-c598-4f62-b437-19cf908773bd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfChangesInFairValueOfPlanAssetsTableTextBlock"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_30998978-90ad-4cfe-8e5a-3c795306ac40" xlink:to="loc_us-gaap_ScheduleOfChangesInFairValueOfPlanAssetsTableTextBlock_7e633da9-c598-4f62-b437-19cf908773bd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsTableTextBlock_d97ead12-1a27-4198-863e-2d6a6ed44e8c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsTableTextBlock"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_30998978-90ad-4cfe-8e5a-3c795306ac40" xlink:to="loc_us-gaap_ScheduleOfEffectOfSignificantUnobservableInputsChangesInPlanAssetsTableTextBlock_d97ead12-1a27-4198-863e-2d6a6ed44e8c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_eaba6bc1-5fb6-4d41-aa0d-098e79b9345e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_30998978-90ad-4cfe-8e5a-3c795306ac40" xlink:to="loc_us-gaap_ScheduleOfExpectedBenefitPaymentsTableTextBlock_eaba6bc1-5fb6-4d41-aa0d-098e79b9345e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ScheduleOfOtherPostretirementBenefitsOtherInformationTableTextBlock_a4904063-bf8e-462f-84c6-e1e07fd37012" xlink:href="aon-20201231.xsd#aon_ScheduleOfOtherPostretirementBenefitsOtherInformationTableTextBlock"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_30998978-90ad-4cfe-8e5a-3c795306ac40" xlink:to="loc_aon_ScheduleOfOtherPostretirementBenefitsOtherInformationTableTextBlock_a4904063-bf8e-462f-84c6-e1e07fd37012" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsScheduleofexpenserecognizedinCompensationandbenefitintheConsolidatedStatementsofIncomeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsScheduleofexpenserecognizedinCompensationandbenefitintheConsolidatedStatementsofIncomeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsScheduleofexpenserecognizedinCompensationandbenefitintheConsolidatedStatementsofIncomeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_4659b336-ba34-46b6-b65c-1f2f88f52625" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_5b01ee0a-5439-4e45-9f7b-67fa5d7dc197" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_4659b336-ba34-46b6-b65c-1f2f88f52625" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_5b01ee0a-5439-4e45-9f7b-67fa5d7dc197" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_32b878c5-8b12-4dea-925e-68b8119e54cf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_5b01ee0a-5439-4e45-9f7b-67fa5d7dc197" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_32b878c5-8b12-4dea-925e-68b8119e54cf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_9cf839af-a53c-4f04-b548-d7ed13f6d689" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_32b878c5-8b12-4dea-925e-68b8119e54cf" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_9cf839af-a53c-4f04-b548-d7ed13f6d689" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_63f4500b-153b-4c39-a102-20ae6d3764bf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_9cf839af-a53c-4f04-b548-d7ed13f6d689" xlink:to="loc_us-gaap_DomesticPlanMember_63f4500b-153b-4c39-a102-20ae6d3764bf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_250624e9-5aff-407d-8bf2-1cb78df2d31b" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_63f4500b-153b-4c39-a102-20ae6d3764bf" xlink:to="loc_country_US_250624e9-5aff-407d-8bf2-1cb78df2d31b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_2d0807c6-ae2b-4404-a215-68b66218f6b3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignPlanMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_9cf839af-a53c-4f04-b548-d7ed13f6d689" xlink:to="loc_us-gaap_ForeignPlanMember_2d0807c6-ae2b-4404-a215-68b66218f6b3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_72409786-6abe-47b5-8790-9924792a5339" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_2d0807c6-ae2b-4404-a215-68b66218f6b3" xlink:to="loc_country_GB_72409786-6abe-47b5-8790-9924792a5339" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_ce00c97d-06f3-4824-8bbc-5826b6e9dedb" xlink:href="aon-20201231.xsd#aon_TheNetherlandsAndCanadaMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_2d0807c6-ae2b-4404-a215-68b66218f6b3" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_ce00c97d-06f3-4824-8bbc-5826b6e9dedb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_f7aaa087-cbd6-4b72-826d-5b0c55f60ba0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_5b01ee0a-5439-4e45-9f7b-67fa5d7dc197" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_f7aaa087-cbd6-4b72-826d-5b0c55f60ba0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanCostRecognized_91433967-f6a2-4c82-95a5-079316c109fc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedContributionPlanCostRecognized"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_f7aaa087-cbd6-4b72-826d-5b0c55f60ba0" xlink:to="loc_us-gaap_DefinedContributionPlanCostRecognized_91433967-f6a2-4c82-95a5-079316c109fc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsPensionPlansNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsPensionPlansNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsPensionPlansNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_40374d74-cb4e-4a62-8dbd-c4a5247b9e7d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_827b9883-36ab-4459-b17a-256a89666f07" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_40374d74-cb4e-4a62-8dbd-c4a5247b9e7d" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_827b9883-36ab-4459-b17a-256a89666f07" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_8153c9e6-a998-46d2-a7c5-f2b61125eed4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_827b9883-36ab-4459-b17a-256a89666f07" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_8153c9e6-a998-46d2-a7c5-f2b61125eed4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_39b1bacc-46d5-40b5-a042-eaeaad88a5c3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_8153c9e6-a998-46d2-a7c5-f2b61125eed4" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_39b1bacc-46d5-40b5-a042-eaeaad88a5c3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_db6c7ac3-1043-4988-82e8-1d515f6488df" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_39b1bacc-46d5-40b5-a042-eaeaad88a5c3" xlink:to="loc_us-gaap_DomesticPlanMember_db6c7ac3-1043-4988-82e8-1d515f6488df" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_52971d07-aa28-4d52-b35e-23a5b961228b" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_db6c7ac3-1043-4988-82e8-1d515f6488df" xlink:to="loc_country_US_52971d07-aa28-4d52-b35e-23a5b961228b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_39a41963-2ed5-4fa6-808b-0ce5f5897d2e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignPlanMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_39b1bacc-46d5-40b5-a042-eaeaad88a5c3" xlink:to="loc_us-gaap_ForeignPlanMember_39a41963-2ed5-4fa6-808b-0ce5f5897d2e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_8491b79f-4163-4c21-8972-19a8ae4e74ae" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_39a41963-2ed5-4fa6-808b-0ce5f5897d2e" xlink:to="loc_country_GB_8491b79f-4163-4c21-8972-19a8ae4e74ae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_358158e0-8469-4dbf-80f6-3e3f3c82b364" xlink:href="aon-20201231.xsd#aon_TheNetherlandsAndCanadaMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_39a41963-2ed5-4fa6-808b-0ce5f5897d2e" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_358158e0-8469-4dbf-80f6-3e3f3c82b364" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_0a8dca48-b5e5-4493-95b7-0a6faa8ff888" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_827b9883-36ab-4459-b17a-256a89666f07" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_0a8dca48-b5e5-4493-95b7-0a6faa8ff888" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_b56289ff-54a9-4bde-85ae-3cd1486aa639" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_0a8dca48-b5e5-4493-95b7-0a6faa8ff888" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_b56289ff-54a9-4bde-85ae-3cd1486aa639" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_629fed92-5256-4cac-9771-ee8df7721f8a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_b56289ff-54a9-4bde-85ae-3cd1486aa639" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_629fed92-5256-4cac-9771-ee8df7721f8a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_86d0742d-8947-4c47-a795-b1b78216a2b8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_827b9883-36ab-4459-b17a-256a89666f07" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_86d0742d-8947-4c47-a795-b1b78216a2b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DefinedBenefitPlanPercentageOfTotalPensionObligations_79b4a2a8-d8b5-444c-862a-f6f5d994d94b" xlink:href="aon-20201231.xsd#aon_DefinedBenefitPlanPercentageOfTotalPensionObligations"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_86d0742d-8947-4c47-a795-b1b78216a2b8" xlink:to="loc_aon_DefinedBenefitPlanPercentageOfTotalPensionObligations_79b4a2a8-d8b5-444c-862a-f6f5d994d94b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEstimatedAmountOfPlanParticipantsFutureBenefitsCoveredByInsuranceContractsIssuedByEmployerOrRelatedParties_55e0c0c5-be0e-4415-a49c-bf4e98ddb71b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanEstimatedAmountOfPlanParticipantsFutureBenefitsCoveredByInsuranceContractsIssuedByEmployerOrRelatedParties"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_86d0742d-8947-4c47-a795-b1b78216a2b8" xlink:to="loc_us-gaap_DefinedBenefitPlanEstimatedAmountOfPlanParticipantsFutureBenefitsCoveredByInsuranceContractsIssuedByEmployerOrRelatedParties_55e0c0c5-be0e-4415-a49c-bf4e98ddb71b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_20e0839a-fbc1-4ac6-b241-a40d72b57d02" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_86d0742d-8947-4c47-a795-b1b78216a2b8" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsProjectedBenefitObligation_20e0839a-fbc1-4ac6-b241-a40d72b57d02" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_53a83724-2ad6-4af7-8002-129ec331cf08" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_86d0742d-8947-4c47-a795-b1b78216a2b8" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateAccumulatedBenefitObligation_53a83724-2ad6-4af7-8002-129ec331cf08" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_53fc6b44-69de-495f-9df1-cb099e06aa5a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_86d0742d-8947-4c47-a795-b1b78216a2b8" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlansWithAccumulatedBenefitObligationsInExcessOfPlanAssetsAggregateFairValueOfPlanAssets_53fc6b44-69de-495f-9df1-cb099e06aa5a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_cf9921e1-d4dd-4e8f-8a43-7cb6e405513d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_86d0742d-8947-4c47-a795-b1b78216a2b8" xlink:to="loc_us-gaap_DefinedBenefitPlanPensionPlanWithProjectedBenefitObligationInExcessOfPlanAssetsPlanAssets_cf9921e1-d4dd-4e8f-8a43-7cb6e405513d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_83912f03-f58c-4f40-a790-fd82df18ec4e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanSettlementsPlanAssets"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_86d0742d-8947-4c47-a795-b1b78216a2b8" xlink:to="loc_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_83912f03-f58c-4f40-a790-fd82df18ec4e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease_ed8d59f1-ab46-4ac9-90ef-b1431b46a6e7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_86d0742d-8947-4c47-a795-b1b78216a2b8" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationPeriodIncreaseDecrease_ed8d59f1-ab46-4ac9-90ef-b1431b46a6e7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_2a9d5068-da82-45ef-ab1d-d3a9cf014b2e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_86d0742d-8947-4c47-a795-b1b78216a2b8" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_2a9d5068-da82-45ef-ab1d-d3a9cf014b2e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_3f10e021-6933-45d4-ab71-89d04eadc725" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_86d0742d-8947-4c47-a795-b1b78216a2b8" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_3f10e021-6933-45d4-ab71-89d04eadc725" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsReconciliationofthechangesinthebenefitobligationsandfairvalueofassetsandastatementofthefundedstatusDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsReconciliationofthechangesinthebenefitobligationsandfairvalueofassetsandastatementofthefundedstatusDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsReconciliationofthechangesinthebenefitobligationsandfairvalueofassetsandastatementofthefundedstatusDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_93286dc6-ca5e-4184-9c70-8529544ec7bb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_242e9c6b-ff9f-4ea4-9766-96c58c7bcc3f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_93286dc6-ca5e-4184-9c70-8529544ec7bb" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_242e9c6b-ff9f-4ea4-9766-96c58c7bcc3f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_91dcd921-670a-4268-98a2-b79a2391131b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_242e9c6b-ff9f-4ea4-9766-96c58c7bcc3f" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_91dcd921-670a-4268-98a2-b79a2391131b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_ae2562f1-c631-45fc-8476-9fed17a560df" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_91dcd921-670a-4268-98a2-b79a2391131b" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_ae2562f1-c631-45fc-8476-9fed17a560df" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_1386f225-2922-43a7-94ee-fef2f9d25728" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_ae2562f1-c631-45fc-8476-9fed17a560df" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_1386f225-2922-43a7-94ee-fef2f9d25728" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_2e6c344d-8cff-4398-8d86-131effbcec2a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_242e9c6b-ff9f-4ea4-9766-96c58c7bcc3f" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_2e6c344d-8cff-4398-8d86-131effbcec2a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_33425159-ed89-46fe-acfa-cdb1597ad6b9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_2e6c344d-8cff-4398-8d86-131effbcec2a" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_33425159-ed89-46fe-acfa-cdb1597ad6b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_3cdbc532-b45e-4756-830d-87709cf534ad" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_33425159-ed89-46fe-acfa-cdb1597ad6b9" xlink:to="loc_us-gaap_DomesticPlanMember_3cdbc532-b45e-4756-830d-87709cf534ad" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_2f6e0efb-78eb-47b4-9a91-7b431318682f" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_3cdbc532-b45e-4756-830d-87709cf534ad" xlink:to="loc_country_US_2f6e0efb-78eb-47b4-9a91-7b431318682f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_a22f047c-fd3d-4f76-8ed0-2e948c99d693" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignPlanMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_33425159-ed89-46fe-acfa-cdb1597ad6b9" xlink:to="loc_us-gaap_ForeignPlanMember_a22f047c-fd3d-4f76-8ed0-2e948c99d693" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_108b6640-8f18-4901-9135-c2350edef477" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_a22f047c-fd3d-4f76-8ed0-2e948c99d693" xlink:to="loc_country_GB_108b6640-8f18-4901-9135-c2350edef477" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_e8e68829-7d3e-409c-854d-378b54185491" xlink:href="aon-20201231.xsd#aon_TheNetherlandsAndCanadaMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_a22f047c-fd3d-4f76-8ed0-2e948c99d693" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_e8e68829-7d3e-409c-854d-378b54185491" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a784d6be-3f19-47e6-9a56-45974c14faa5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_242e9c6b-ff9f-4ea4-9766-96c58c7bcc3f" xlink:to="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a784d6be-3f19-47e6-9a56-45974c14faa5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_884b8bdf-3ad0-4645-b0de-f1817d6ae1a3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a784d6be-3f19-47e6-9a56-45974c14faa5" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_884b8bdf-3ad0-4645-b0de-f1817d6ae1a3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_bcb9fd87-cd66-4572-9bbc-433ba608bdc0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_884b8bdf-3ad0-4645-b0de-f1817d6ae1a3" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_bcb9fd87-cd66-4572-9bbc-433ba608bdc0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_04094e0a-31c4-4702-b4fb-bcec82bcd0e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_884b8bdf-3ad0-4645-b0de-f1817d6ae1a3" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_04094e0a-31c4-4702-b4fb-bcec82bcd0e3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_25704b08-9530-4834-bfc2-f7309a8750e5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_884b8bdf-3ad0-4645-b0de-f1817d6ae1a3" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_25704b08-9530-4834-bfc2-f7309a8750e5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAmendments_45cd4caa-8d45-4c61-91c8-7ee9b3543c4f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAmendments"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_884b8bdf-3ad0-4645-b0de-f1817d6ae1a3" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAmendments_45cd4caa-8d45-4c61-91c8-7ee9b3543c4f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanSettlementsBenefitObligation_c0030368-272b-454b-97ed-5cd32f051b89" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanSettlementsBenefitObligation"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_884b8bdf-3ad0-4645-b0de-f1817d6ae1a3" xlink:to="loc_us-gaap_DefinedBenefitPlanSettlementsBenefitObligation_c0030368-272b-454b-97ed-5cd32f051b89" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_56b60fd9-3be4-4ab4-80e8-f9150d572f11" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_884b8bdf-3ad0-4645-b0de-f1817d6ae1a3" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_56b60fd9-3be4-4ab4-80e8-f9150d572f11" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_8e93dedc-fdba-470c-9bf6-b6a711c0a2c3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_884b8bdf-3ad0-4645-b0de-f1817d6ae1a3" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_8e93dedc-fdba-470c-9bf6-b6a711c0a2c3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_22f436ea-e84d-4e3d-a3b9-aa2704e186fc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_884b8bdf-3ad0-4645-b0de-f1817d6ae1a3" xlink:to="loc_us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_22f436ea-e84d-4e3d-a3b9-aa2704e186fc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_294256b2-fd6e-43b2-bda8-77691c2cc386" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_884b8bdf-3ad0-4645-b0de-f1817d6ae1a3" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_294256b2-fd6e-43b2-bda8-77691c2cc386" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_5cc9d5f3-6af7-49b8-a360-db4da1383a2a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a784d6be-3f19-47e6-9a56-45974c14faa5" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_5cc9d5f3-6af7-49b8-a360-db4da1383a2a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0fe93fd6-e7c2-4efb-83af-5b5ef4458718" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a784d6be-3f19-47e6-9a56-45974c14faa5" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0fe93fd6-e7c2-4efb-83af-5b5ef4458718" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_42fb6fa3-1564-44d9-bf49-36bcb7fe5f9d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0fe93fd6-e7c2-4efb-83af-5b5ef4458718" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_42fb6fa3-1564-44d9-bf49-36bcb7fe5f9d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_6281696f-f367-4bf4-909a-9f2e9984d41f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0fe93fd6-e7c2-4efb-83af-5b5ef4458718" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_6281696f-f367-4bf4-909a-9f2e9984d41f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_2f3d497f-fb0b-4ae5-8b33-7fca003f92d9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0fe93fd6-e7c2-4efb-83af-5b5ef4458718" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_2f3d497f-fb0b-4ae5-8b33-7fca003f92d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_6ee12a45-91f0-44cf-866a-84a02578603d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanSettlementsPlanAssets"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0fe93fd6-e7c2-4efb-83af-5b5ef4458718" xlink:to="loc_us-gaap_DefinedBenefitPlanSettlementsPlanAssets_6ee12a45-91f0-44cf-866a-84a02578603d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_d8eeb6f7-e325-4051-8232-0a8d4443fa1d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0fe93fd6-e7c2-4efb-83af-5b5ef4458718" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_d8eeb6f7-e325-4051-8232-0a8d4443fa1d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_13b75700-7058-4f65-b4d0-2baf6835c480" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0fe93fd6-e7c2-4efb-83af-5b5ef4458718" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_13b75700-7058-4f65-b4d0-2baf6835c480" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_69783b35-b790-4c5d-b348-12ba0af9d5a7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0fe93fd6-e7c2-4efb-83af-5b5ef4458718" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_69783b35-b790-4c5d-b348-12ba0af9d5a7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DefinedBenefitPlanMarketRelatedValue_dbeeba19-147e-4788-82e5-0285f9ba5fc2" xlink:href="aon-20201231.xsd#aon_DefinedBenefitPlanMarketRelatedValue"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a784d6be-3f19-47e6-9a56-45974c14faa5" xlink:to="loc_aon_DefinedBenefitPlanMarketRelatedValue_dbeeba19-147e-4788-82e5-0285f9ba5fc2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_b3e6d88c-fea5-47df-84b8-69fe43a67ee2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a784d6be-3f19-47e6-9a56-45974c14faa5" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_b3e6d88c-fea5-47df-84b8-69fe43a67ee2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_f12fd087-995e-4aa0-8187-7b651b258854" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a784d6be-3f19-47e6-9a56-45974c14faa5" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_f12fd087-995e-4aa0-8187-7b651b258854" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_20a8e5e0-8f0e-4788-b71b-be0650cd31dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a784d6be-3f19-47e6-9a56-45974c14faa5" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_20a8e5e0-8f0e-4788-b71b-be0650cd31dc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_c602966a-7dac-4721-ab8d-8e939077b606" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_a784d6be-3f19-47e6-9a56-45974c14faa5" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_c602966a-7dac-4721-ab8d-8e939077b606" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsAmountsrecognizedintheConsolidatedStatementsofFinancialPositionDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsAmountsrecognizedintheConsolidatedStatementsofFinancialPositionDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsAmountsrecognizedintheConsolidatedStatementsofFinancialPositionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_59cb20cc-a8c0-4df0-906d-a54f4fed9714" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_7a2e8ae6-e623-4eae-9d72-b52e2748eec6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_59cb20cc-a8c0-4df0-906d-a54f4fed9714" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_7a2e8ae6-e623-4eae-9d72-b52e2748eec6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_3f50b728-1434-4cf5-b987-1e6d2479d8f2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_7a2e8ae6-e623-4eae-9d72-b52e2748eec6" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_3f50b728-1434-4cf5-b987-1e6d2479d8f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_4bef6a93-e17e-48d4-854b-1aa233b28cdb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_3f50b728-1434-4cf5-b987-1e6d2479d8f2" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_4bef6a93-e17e-48d4-854b-1aa233b28cdb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_8056ab76-dc53-4e12-bb48-8b9ffa260ae9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_4bef6a93-e17e-48d4-854b-1aa233b28cdb" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_8056ab76-dc53-4e12-bb48-8b9ffa260ae9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_5d085d66-93d4-4e0f-a114-0f6c43708a05" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_7a2e8ae6-e623-4eae-9d72-b52e2748eec6" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_5d085d66-93d4-4e0f-a114-0f6c43708a05" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_5f85454c-9598-4c72-a5aa-b86b13de9ff3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_5d085d66-93d4-4e0f-a114-0f6c43708a05" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_5f85454c-9598-4c72-a5aa-b86b13de9ff3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_5769a7cd-b424-4939-92ac-9382711b4435" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_5f85454c-9598-4c72-a5aa-b86b13de9ff3" xlink:to="loc_us-gaap_DomesticPlanMember_5769a7cd-b424-4939-92ac-9382711b4435" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_112b9737-02b1-4540-8988-a46cffd796ed" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_5769a7cd-b424-4939-92ac-9382711b4435" xlink:to="loc_country_US_112b9737-02b1-4540-8988-a46cffd796ed" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_9b19a284-9a1d-421a-90ba-56a04647752a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignPlanMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_5f85454c-9598-4c72-a5aa-b86b13de9ff3" xlink:to="loc_us-gaap_ForeignPlanMember_9b19a284-9a1d-421a-90ba-56a04647752a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_7cfa6b11-060b-4341-8720-402e2648a8ac" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_9b19a284-9a1d-421a-90ba-56a04647752a" xlink:to="loc_country_GB_7cfa6b11-060b-4341-8720-402e2648a8ac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_e9a20f12-dc42-4af8-aa0e-704ae7eca5df" xlink:href="aon-20201231.xsd#aon_TheNetherlandsAndCanadaMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_9b19a284-9a1d-421a-90ba-56a04647752a" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_e9a20f12-dc42-4af8-aa0e-704ae7eca5df" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_18df7498-cf11-4243-93e0-e156fc584471" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_7a2e8ae6-e623-4eae-9d72-b52e2748eec6" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_18df7498-cf11-4243-93e0-e156fc584471" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_9d825c44-40e5-4e43-8d25-1939cf0f3221" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_18df7498-cf11-4243-93e0-e156fc584471" xlink:to="loc_us-gaap_DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent_9d825c44-40e5-4e43-8d25-1939cf0f3221" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_532b4f15-4ec9-4004-9369-b50c3e22f842" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_18df7498-cf11-4243-93e0-e156fc584471" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansCurrentLiabilities_532b4f15-4ec9-4004-9369-b50c3e22f842" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_976ca25f-417f-4150-821f-a60f672f6aa2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_18df7498-cf11-4243-93e0-e156fc584471" xlink:to="loc_us-gaap_PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent_976ca25f-417f-4150-821f-a60f672f6aa2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_649fd606-d116-41cd-a21a-432e3730128c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_18df7498-cf11-4243-93e0-e156fc584471" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_649fd606-d116-41cd-a21a-432e3730128c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_bdbf3e06-db04-48f9-bab9-68bd12ba3617" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_18df7498-cf11-4243-93e0-e156fc584471" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_bdbf3e06-db04-48f9-bab9-68bd12ba3617" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsAmountsrecognizedinAccumulatedothercomprehensivelossthathavenotyetbeenrecognizedDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsAmountsrecognizedinAccumulatedothercomprehensivelossthathavenotyetbeenrecognizedDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsAmountsrecognizedinAccumulatedothercomprehensivelossthathavenotyetbeenrecognizedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_76cb5e58-52d3-4d2c-b037-c2a221a52206" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_f66ebb42-0487-4938-bbc7-3b9214ee4512" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_76cb5e58-52d3-4d2c-b037-c2a221a52206" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_f66ebb42-0487-4938-bbc7-3b9214ee4512" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_27279dfe-df41-4f2f-9876-e484bd8c0e19" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_f66ebb42-0487-4938-bbc7-3b9214ee4512" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_27279dfe-df41-4f2f-9876-e484bd8c0e19" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_5d03b8be-7869-4cf8-a3f0-a589257ba1a5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_27279dfe-df41-4f2f-9876-e484bd8c0e19" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_5d03b8be-7869-4cf8-a3f0-a589257ba1a5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_5cbbcab3-e143-47e8-a318-b0c2d0d160ec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_5d03b8be-7869-4cf8-a3f0-a589257ba1a5" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_5cbbcab3-e143-47e8-a318-b0c2d0d160ec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_297c248d-3423-44b5-a2b8-47d987a592b9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_f66ebb42-0487-4938-bbc7-3b9214ee4512" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_297c248d-3423-44b5-a2b8-47d987a592b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_48fc9e7a-0f29-4b8c-bef2-8c8d4a276a6a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_297c248d-3423-44b5-a2b8-47d987a592b9" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_48fc9e7a-0f29-4b8c-bef2-8c8d4a276a6a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_6963fbe2-fcfb-4c4d-85f5-22f8d0c2e784" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_48fc9e7a-0f29-4b8c-bef2-8c8d4a276a6a" xlink:to="loc_us-gaap_DomesticPlanMember_6963fbe2-fcfb-4c4d-85f5-22f8d0c2e784" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_72fc9cb5-681b-4fe8-9e95-322b7dfe5e77" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_6963fbe2-fcfb-4c4d-85f5-22f8d0c2e784" xlink:to="loc_country_US_72fc9cb5-681b-4fe8-9e95-322b7dfe5e77" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_c77e22a2-b575-44c8-b8cd-02e6c59d25a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignPlanMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_48fc9e7a-0f29-4b8c-bef2-8c8d4a276a6a" xlink:to="loc_us-gaap_ForeignPlanMember_c77e22a2-b575-44c8-b8cd-02e6c59d25a9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_51766ff3-c256-4f1e-86ef-d6fe7c9731e7" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_c77e22a2-b575-44c8-b8cd-02e6c59d25a9" xlink:to="loc_country_GB_51766ff3-c256-4f1e-86ef-d6fe7c9731e7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_a686db5e-4c4e-479b-abe4-6ac552252491" xlink:href="aon-20201231.xsd#aon_TheNetherlandsAndCanadaMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_c77e22a2-b575-44c8-b8cd-02e6c59d25a9" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_a686db5e-4c4e-479b-abe4-6ac552252491" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_924d3201-9987-4a32-a949-1e3e5334bbd9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_f66ebb42-0487-4938-bbc7-3b9214ee4512" xlink:to="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_924d3201-9987-4a32-a949-1e3e5334bbd9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_c4f8d0af-a42d-4e91-95d0-0bb8697bffda" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_924d3201-9987-4a32-a949-1e3e5334bbd9" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_c4f8d0af-a42d-4e91-95d0-0bb8697bffda" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_2b0e89a9-0a10-4dca-9981-5004e39c5359" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_c4f8d0af-a42d-4e91-95d0-0bb8697bffda" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_2b0e89a9-0a10-4dca-9981-5004e39c5359" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedNetLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_04a2091b-ff6a-4c86-886a-9a415c3dd90b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_c4f8d0af-a42d-4e91-95d0-0bb8697bffda" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_04a2091b-ff6a-4c86-886a-9a415c3dd90b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_6688f53c-fec5-4600-97d2-ef7205a14ee7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTaxAbstract_c4f8d0af-a42d-4e91-95d0-0bb8697bffda" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax_6688f53c-fec5-4600-97d2-ef7205a14ee7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsComponentsofnetperiodicbenefitcostDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsComponentsofnetperiodicbenefitcostDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsComponentsofnetperiodicbenefitcostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_d2f34021-4ec5-4d32-bbbf-6ee3c4447aa3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_dbf2f4ac-1447-4a90-a445-5edca3caf4cd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_d2f34021-4ec5-4d32-bbbf-6ee3c4447aa3" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_dbf2f4ac-1447-4a90-a445-5edca3caf4cd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_c39b5809-2c17-4d43-8f18-6ee6f4e88212" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_dbf2f4ac-1447-4a90-a445-5edca3caf4cd" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_c39b5809-2c17-4d43-8f18-6ee6f4e88212" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_65e91160-71e6-4d84-94c1-d12992567eec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_c39b5809-2c17-4d43-8f18-6ee6f4e88212" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_65e91160-71e6-4d84-94c1-d12992567eec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_4c4c3965-c914-417d-8ec6-338d62760ae8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_65e91160-71e6-4d84-94c1-d12992567eec" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_4c4c3965-c914-417d-8ec6-338d62760ae8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_1a0e0b63-af04-4527-908a-e9045550fc1e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_dbf2f4ac-1447-4a90-a445-5edca3caf4cd" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_1a0e0b63-af04-4527-908a-e9045550fc1e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_d8a9c3c3-6a79-4b95-be12-6a0bb89f2572" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_1a0e0b63-af04-4527-908a-e9045550fc1e" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_d8a9c3c3-6a79-4b95-be12-6a0bb89f2572" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_97adf1aa-7e5e-4824-8246-b41d63c7b2f7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_d8a9c3c3-6a79-4b95-be12-6a0bb89f2572" xlink:to="loc_us-gaap_DomesticPlanMember_97adf1aa-7e5e-4824-8246-b41d63c7b2f7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_9ebe4b06-2a66-4580-9574-28a96f6cc0e2" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_97adf1aa-7e5e-4824-8246-b41d63c7b2f7" xlink:to="loc_country_US_9ebe4b06-2a66-4580-9574-28a96f6cc0e2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_eec392f5-065c-48e6-b177-d688932e9211" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignPlanMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_d8a9c3c3-6a79-4b95-be12-6a0bb89f2572" xlink:to="loc_us-gaap_ForeignPlanMember_eec392f5-065c-48e6-b177-d688932e9211" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_bb8e59d8-d61e-4cb5-be48-a5ac8587d338" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_eec392f5-065c-48e6-b177-d688932e9211" xlink:to="loc_country_GB_bb8e59d8-d61e-4cb5-be48-a5ac8587d338" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_9f886b96-f2e0-49fc-a1a8-f7ab58d907f9" xlink:href="aon-20201231.xsd#aon_TheNetherlandsAndCanadaMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_eec392f5-065c-48e6-b177-d688932e9211" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_9f886b96-f2e0-49fc-a1a8-f7ab58d907f9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_a6738860-9734-4844-91ab-1e7347a1da29" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_dbf2f4ac-1447-4a90-a445-5edca3caf4cd" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_a6738860-9734-4844-91ab-1e7347a1da29" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_9ed912ec-db6e-4529-b4e4-49114aeb49ea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_a6738860-9734-4844-91ab-1e7347a1da29" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_9ed912ec-db6e-4529-b4e4-49114aeb49ea" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_cd13d664-4630-462e-9b17-a1968c1bea23" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_a6738860-9734-4844-91ab-1e7347a1da29" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_cd13d664-4630-462e-9b17-a1968c1bea23" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_2a7a7fed-f63c-4e91-9528-f38bba3b2c08" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_a6738860-9734-4844-91ab-1e7347a1da29" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedReturnOnPlanAssets_2a7a7fed-f63c-4e91-9528-f38bba3b2c08" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_ffa85d21-b1cb-4bba-8bdd-a079301e6f15" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_a6738860-9734-4844-91ab-1e7347a1da29" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfPriorServiceCostCredit_ffa85d21-b1cb-4bba-8bdd-a079301e6f15" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_066ca6bc-9bbe-4d84-82bd-bf2f2dbc7b73" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_a6738860-9734-4844-91ab-1e7347a1da29" xlink:to="loc_us-gaap_DefinedBenefitPlanAmortizationOfGainsLosses_066ca6bc-9bbe-4d84-82bd-bf2f2dbc7b73" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DefinedBenefitPlanNetPeriodicBenefitCostBeforeRecognizedNetGainLossDuetoSettlementsandCurtailments_664dce2b-b1e7-4107-a0af-56c875c00719" xlink:href="aon-20201231.xsd#aon_DefinedBenefitPlanNetPeriodicBenefitCostBeforeRecognizedNetGainLossDuetoSettlementsandCurtailments"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_a6738860-9734-4844-91ab-1e7347a1da29" xlink:to="loc_aon_DefinedBenefitPlanNetPeriodicBenefitCostBeforeRecognizedNetGainLossDuetoSettlementsandCurtailments_664dce2b-b1e7-4107-a0af-56c875c00719" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_75ec1285-084f-49c4-99ff-4f7614b1225d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_a6738860-9734-4844-91ab-1e7347a1da29" xlink:to="loc_us-gaap_DefinedBenefitPlanRecognizedNetGainLossDueToSettlements1_75ec1285-084f-49c4-99ff-4f7614b1225d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_653a6a58-a3b5-4f31-871d-458477eb2054" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_a6738860-9734-4844-91ab-1e7347a1da29" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_653a6a58-a3b5-4f31-871d-458477eb2054" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsWeightedaverageassumptionsusedtodeterminefuturebenefitobligationsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsWeightedaverageassumptionsusedtodeterminefuturebenefitobligationsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsWeightedaverageassumptionsusedtodeterminefuturebenefitobligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_6df731bf-5042-4214-bb96-8fdc201cee0a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_8c72e86b-38bd-47e9-9ca1-c838c62bf062" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_6df731bf-5042-4214-bb96-8fdc201cee0a" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_8c72e86b-38bd-47e9-9ca1-c838c62bf062" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_7d55bcf8-8e61-4f75-8111-3721b2ede44d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_8c72e86b-38bd-47e9-9ca1-c838c62bf062" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_7d55bcf8-8e61-4f75-8111-3721b2ede44d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_65ac6fb2-7a4b-48f8-a428-7f5ffdb24999" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_7d55bcf8-8e61-4f75-8111-3721b2ede44d" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_65ac6fb2-7a4b-48f8-a428-7f5ffdb24999" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_b17f2e9e-6de1-41c3-92e0-3faa41f1f416" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_65ac6fb2-7a4b-48f8-a428-7f5ffdb24999" xlink:to="loc_us-gaap_DomesticPlanMember_b17f2e9e-6de1-41c3-92e0-3faa41f1f416" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_23de483f-6215-4e3c-9776-880b47cfb623" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_65ac6fb2-7a4b-48f8-a428-7f5ffdb24999" xlink:to="loc_country_GB_23de483f-6215-4e3c-9776-880b47cfb623" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_fa2bedfc-273b-463b-82bb-cfc1e9f3df54" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_65ac6fb2-7a4b-48f8-a428-7f5ffdb24999" xlink:to="loc_country_US_fa2bedfc-273b-463b-82bb-cfc1e9f3df54" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_91120096-2558-4636-8ad6-b82b22258e85" xlink:href="aon-20201231.xsd#aon_TheNetherlandsAndCanadaMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_65ac6fb2-7a4b-48f8-a428-7f5ffdb24999" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_91120096-2558-4636-8ad6-b82b22258e85" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_103a8383-b030-456d-ae37-6e5acd720eec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignPlanMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_65ac6fb2-7a4b-48f8-a428-7f5ffdb24999" xlink:to="loc_us-gaap_ForeignPlanMember_103a8383-b030-456d-ae37-6e5acd720eec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_91db8985-c9ae-4eeb-8d1f-b10f5f9c15b7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_8c72e86b-38bd-47e9-9ca1-c838c62bf062" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_91db8985-c9ae-4eeb-8d1f-b10f5f9c15b7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_2eb70902-935f-4dff-b038-bed4b2be278a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_91db8985-c9ae-4eeb-8d1f-b10f5f9c15b7" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_2eb70902-935f-4dff-b038-bed4b2be278a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_ecf49699-eca0-4d3a-b414-6f6c3ea21102" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_2eb70902-935f-4dff-b038-bed4b2be278a" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_ecf49699-eca0-4d3a-b414-6f6c3ea21102" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_7553ec8b-1e66-4e08-a307-f71e2cf8004c" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_8c72e86b-38bd-47e9-9ca1-c838c62bf062" xlink:to="loc_srt_RangeAxis_7553ec8b-1e66-4e08-a307-f71e2cf8004c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e381b2bd-0440-4a83-ac3f-efdc88c4fa3d" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_7553ec8b-1e66-4e08-a307-f71e2cf8004c" xlink:to="loc_srt_RangeMember_e381b2bd-0440-4a83-ac3f-efdc88c4fa3d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_50bb90c3-01bd-4cd3-8564-47cfb1ab5643" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_e381b2bd-0440-4a83-ac3f-efdc88c4fa3d" xlink:to="loc_srt_MinimumMember_50bb90c3-01bd-4cd3-8564-47cfb1ab5643" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_9889a8fd-ee17-4c5e-bbea-70ccc7149f3f" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_e381b2bd-0440-4a83-ac3f-efdc88c4fa3d" xlink:to="loc_srt_MaximumMember_9889a8fd-ee17-4c5e-bbea-70ccc7149f3f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_24231692-4895-467f-baab-525b365fcdd0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_8c72e86b-38bd-47e9-9ca1-c838c62bf062" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_24231692-4895-467f-baab-525b365fcdd0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_6bc70b84-310a-432d-a678-e1701f9c9f27" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_24231692-4895-467f-baab-525b365fcdd0" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_6bc70b84-310a-432d-a678-e1701f9c9f27" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease_391a466b-a134-414f-8db0-01eb94ec5eb7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_24231692-4895-467f-baab-525b365fcdd0" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease_391a466b-a134-414f-8db0-01eb94ec5eb7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationUnderlyingPriceInflation_20432d67-0ccb-4777-84d7-665e8be06a04" xlink:href="aon-20201231.xsd#aon_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationUnderlyingPriceInflation"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_24231692-4895-467f-baab-525b365fcdd0" xlink:to="loc_aon_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationUnderlyingPriceInflation_20432d67-0ccb-4777-84d7-665e8be06a04" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsWeightedaverageassumptionsusedtodeterminethenetperiodicbenefitcostDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsWeightedaverageassumptionsusedtodeterminethenetperiodicbenefitcostDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsWeightedaverageassumptionsusedtodeterminethenetperiodicbenefitcostDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_cb88ef93-386e-4e82-8033-ae5d82bbcf4d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_62376b9a-8946-45f6-838e-c0cc9adb5862" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_cb88ef93-386e-4e82-8033-ae5d82bbcf4d" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_62376b9a-8946-45f6-838e-c0cc9adb5862" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_a1e413dc-c894-41e1-96c4-d069d2e9ac6b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_62376b9a-8946-45f6-838e-c0cc9adb5862" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_a1e413dc-c894-41e1-96c4-d069d2e9ac6b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_de17fd5c-3ec0-44e6-8c6f-7afbce9abf44" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_a1e413dc-c894-41e1-96c4-d069d2e9ac6b" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_de17fd5c-3ec0-44e6-8c6f-7afbce9abf44" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_eba7ba9b-1303-4cef-97f9-57cf855347be" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_de17fd5c-3ec0-44e6-8c6f-7afbce9abf44" xlink:to="loc_us-gaap_DomesticPlanMember_eba7ba9b-1303-4cef-97f9-57cf855347be" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_2a2ed716-c048-441c-b2a4-653fcd78d57d" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_eba7ba9b-1303-4cef-97f9-57cf855347be" xlink:to="loc_country_US_2a2ed716-c048-441c-b2a4-653fcd78d57d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_1394af59-9a1a-4234-95c4-c7a52600ac9b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignPlanMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_de17fd5c-3ec0-44e6-8c6f-7afbce9abf44" xlink:to="loc_us-gaap_ForeignPlanMember_1394af59-9a1a-4234-95c4-c7a52600ac9b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_ebc4d147-6f98-40bb-b014-f3618884c1e7" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_1394af59-9a1a-4234-95c4-c7a52600ac9b" xlink:to="loc_country_GB_ebc4d147-6f98-40bb-b014-f3618884c1e7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_4cd0c388-31f4-4d0e-98ed-ed717fc8b16e" xlink:href="aon-20201231.xsd#aon_TheNetherlandsAndCanadaMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_1394af59-9a1a-4234-95c4-c7a52600ac9b" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_4cd0c388-31f4-4d0e-98ed-ed717fc8b16e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_0a223e68-f57b-4d6b-a0c5-cfcf65581062" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_62376b9a-8946-45f6-838e-c0cc9adb5862" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_0a223e68-f57b-4d6b-a0c5-cfcf65581062" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_3abc0632-0724-4616-9242-3b302bb94914" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_0a223e68-f57b-4d6b-a0c5-cfcf65581062" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_3abc0632-0724-4616-9242-3b302bb94914" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_98e027df-ab61-44f0-80ce-f85d63cda337" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_3abc0632-0724-4616-9242-3b302bb94914" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_98e027df-ab61-44f0-80ce-f85d63cda337" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_3f7b0ad9-fca5-452d-b3e6-a42039e293a0" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_62376b9a-8946-45f6-838e-c0cc9adb5862" xlink:to="loc_srt_RangeAxis_3f7b0ad9-fca5-452d-b3e6-a42039e293a0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b5971adb-08e0-4d6c-8ccd-ad1657ea9a84" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_3f7b0ad9-fca5-452d-b3e6-a42039e293a0" xlink:to="loc_srt_RangeMember_b5971adb-08e0-4d6c-8ccd-ad1657ea9a84" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_99e5dd79-6daf-4d3e-a835-bb32384313a2" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_b5971adb-08e0-4d6c-8ccd-ad1657ea9a84" xlink:to="loc_srt_MinimumMember_99e5dd79-6daf-4d3e-a835-bb32384313a2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_5420c011-1879-4310-9dc5-f1de07706039" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_b5971adb-08e0-4d6c-8ccd-ad1657ea9a84" xlink:to="loc_srt_MaximumMember_5420c011-1879-4310-9dc5-f1de07706039" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0ea23ca5-04e4-4b8c-827d-9c20ae5093af" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_62376b9a-8946-45f6-838e-c0cc9adb5862" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0ea23ca5-04e4-4b8c-827d-9c20ae5093af" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_cf496a2e-2ab8-498c-8463-f60815622ac9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0ea23ca5-04e4-4b8c-827d-9c20ae5093af" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_cf496a2e-2ab8-498c-8463-f60815622ac9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_d04123c2-409c-437f-91af-f21b4b636520" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0ea23ca5-04e4-4b8c-827d-9c20ae5093af" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_d04123c2-409c-437f-91af-f21b4b636520" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_d04989e0-a5b0-4393-90dc-8cae7f1940f3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_0ea23ca5-04e4-4b8c-827d-9c20ae5093af" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_d04989e0-a5b0-4393-90dc-8cae7f1940f3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsExpectedReturnonPlanAssetsNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsExpectedReturnonPlanAssetsNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsExpectedReturnonPlanAssetsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_a666e431-7efc-4a81-8155-dcc07fb9b676" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_e7fa9f19-f099-4018-b2c3-57d3370248f1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_a666e431-7efc-4a81-8155-dcc07fb9b676" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_e7fa9f19-f099-4018-b2c3-57d3370248f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_df97e23a-925e-4e34-a301-f2d148b03b36" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_e7fa9f19-f099-4018-b2c3-57d3370248f1" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_df97e23a-925e-4e34-a301-f2d148b03b36" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_282a84f3-a0b9-4fc4-b5a0-17debfcb5bd7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_df97e23a-925e-4e34-a301-f2d148b03b36" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_282a84f3-a0b9-4fc4-b5a0-17debfcb5bd7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_e5cbcd71-e2e9-494f-901a-d7393bd400f2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_282a84f3-a0b9-4fc4-b5a0-17debfcb5bd7" xlink:to="loc_us-gaap_DomesticPlanMember_e5cbcd71-e2e9-494f-901a-d7393bd400f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_f8758229-74fb-4d4f-9aab-e2dbe9c7e31d" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_e5cbcd71-e2e9-494f-901a-d7393bd400f2" xlink:to="loc_country_US_f8758229-74fb-4d4f-9aab-e2dbe9c7e31d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_2fea1ddc-3e9c-4b70-a910-150679b5c98e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_e7fa9f19-f099-4018-b2c3-57d3370248f1" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_2fea1ddc-3e9c-4b70-a910-150679b5c98e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_08bfbb18-2946-4e18-af16-8e3ff17a6893" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_2fea1ddc-3e9c-4b70-a910-150679b5c98e" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_08bfbb18-2946-4e18-af16-8e3ff17a6893" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_b52c002c-f799-42ed-a386-e52d7738b933" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_08bfbb18-2946-4e18-af16-8e3ff17a6893" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_b52c002c-f799-42ed-a386-e52d7738b933" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_95bc6702-53f8-4136-b8c1-98346790aa48" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_e7fa9f19-f099-4018-b2c3-57d3370248f1" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_95bc6702-53f8-4136-b8c1-98346790aa48" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_9b2d3d4f-242f-4980-9455-5191b630cbd0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_95bc6702-53f8-4136-b8c1-98346790aa48" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_9b2d3d4f-242f-4980-9455-5191b630cbd0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsScheduleofFairValueofUSPlanAssetsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsScheduleofFairValueofUSPlanAssetsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsScheduleofFairValueofUSPlanAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_abab28e0-ab3b-4e4b-a5eb-709bd106d46d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_d6cc9ad5-3c02-4a8e-9cbd-9c9141a2809a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_abab28e0-ab3b-4e4b-a5eb-709bd106d46d" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_d6cc9ad5-3c02-4a8e-9cbd-9c9141a2809a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_6bb71252-de0c-470c-a91c-5b8aac8115fa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_d6cc9ad5-3c02-4a8e-9cbd-9c9141a2809a" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_6bb71252-de0c-470c-a91c-5b8aac8115fa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_39f1393a-6d6a-46c6-82cc-6611a5d8e6f7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_6bb71252-de0c-470c-a91c-5b8aac8115fa" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_39f1393a-6d6a-46c6-82cc-6611a5d8e6f7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_532aa707-f228-41bf-a9a4-c98e0fea0de7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_39f1393a-6d6a-46c6-82cc-6611a5d8e6f7" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_532aa707-f228-41bf-a9a4-c98e0fea0de7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_d686008c-d96e-4c94-b9a3-1f9d8bb4b45f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_d6cc9ad5-3c02-4a8e-9cbd-9c9141a2809a" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_d686008c-d96e-4c94-b9a3-1f9d8bb4b45f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_e33b30ae-a770-4426-b609-ee83adb6eb59" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_d686008c-d96e-4c94-b9a3-1f9d8bb4b45f" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_e33b30ae-a770-4426-b609-ee83adb6eb59" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_682f75cf-8028-440d-ba09-330d55c1966b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_e33b30ae-a770-4426-b609-ee83adb6eb59" xlink:to="loc_us-gaap_DomesticPlanMember_682f75cf-8028-440d-ba09-330d55c1966b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_84258292-d2c0-4997-808a-c22265966f78" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_682f75cf-8028-440d-ba09-330d55c1966b" xlink:to="loc_country_US_84258292-d2c0-4997-808a-c22265966f78" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_3b0689cc-3b8e-413c-97f8-36cbd7765a74" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_d6cc9ad5-3c02-4a8e-9cbd-9c9141a2809a" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_3b0689cc-3b8e-413c-97f8-36cbd7765a74" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8d26dae4-25ed-4ea6-b6db-aef801c1b026" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_3b0689cc-3b8e-413c-97f8-36cbd7765a74" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8d26dae4-25ed-4ea6-b6db-aef801c1b026" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_2fbddfe7-015b-4088-9432-e72bf6044800" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8d26dae4-25ed-4ea6-b6db-aef801c1b026" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_2fbddfe7-015b-4088-9432-e72bf6044800" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_b9eae9fe-c6aa-4fee-8784-f72fdb711357" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8d26dae4-25ed-4ea6-b6db-aef801c1b026" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_b9eae9fe-c6aa-4fee-8784-f72fdb711357" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_ec448812-b9b1-4b0a-9489-e8dd9a7a600e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_8d26dae4-25ed-4ea6-b6db-aef801c1b026" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_ec448812-b9b1-4b0a-9489-e8dd9a7a600e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_af9a6f1f-32bd-4867-8f50-0de88f6de331" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_d6cc9ad5-3c02-4a8e-9cbd-9c9141a2809a" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_af9a6f1f-32bd-4867-8f50-0de88f6de331" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_6b307e45-5228-4148-abf4-100b9e5f7447" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_af9a6f1f-32bd-4867-8f50-0de88f6de331" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_6b307e45-5228-4148-abf4-100b9e5f7447" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_20079a1c-fa40-4e8d-8c52-cd8c72b082b4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_6b307e45-5228-4148-abf4-100b9e5f7447" xlink:to="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_20079a1c-fa40-4e8d-8c52-cd8c72b082b4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_ff611ba0-8f49-43c5-9d1e-c6f2135126c1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_6b307e45-5228-4148-abf4-100b9e5f7447" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_ff611ba0-8f49-43c5-9d1e-c6f2135126c1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_EquityDerivativeMember_221e4753-2cf2-4438-918b-f1e145f60b2b" xlink:href="aon-20201231.xsd#aon_EquityDerivativeMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_6b307e45-5228-4148-abf4-100b9e5f7447" xlink:to="loc_aon_EquityDerivativeMember_221e4753-2cf2-4438-918b-f1e145f60b2b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_EquityInvestmentsPooledFundsMember_aad26bb7-f49c-4ef8-ba75-62f3be53cab3" xlink:href="aon-20201231.xsd#aon_EquityInvestmentsPooledFundsMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_6b307e45-5228-4148-abf4-100b9e5f7447" xlink:to="loc_aon_EquityInvestmentsPooledFundsMember_aad26bb7-f49c-4ef8-ba75-62f3be53cab3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_f0705b02-526a-4c9f-a58c-3f2b7a7b82d9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CorporateBondSecuritiesMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_6b307e45-5228-4148-abf4-100b9e5f7447" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_f0705b02-526a-4c9f-a58c-3f2b7a7b82d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_GovernmentAndAgencyBondsMember_b90f3eb0-cb05-46fa-b928-5499231e5484" xlink:href="aon-20201231.xsd#aon_GovernmentAndAgencyBondsMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_6b307e45-5228-4148-abf4-100b9e5f7447" xlink:to="loc_aon_GovernmentAndAgencyBondsMember_b90f3eb0-cb05-46fa-b928-5499231e5484" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetBackedSecuritiesMember_15d4159b-8f29-4619-84d8-4f0259dfef9c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetBackedSecuritiesMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_6b307e45-5228-4148-abf4-100b9e5f7447" xlink:to="loc_us-gaap_AssetBackedSecuritiesMember_15d4159b-8f29-4619-84d8-4f0259dfef9c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FixedIncomeInvestmentsPooledFundsMember_7a35bdce-3803-4a72-bd11-ad189c8d8196" xlink:href="aon-20201231.xsd#aon_FixedIncomeInvestmentsPooledFundsMember"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_6b307e45-5228-4148-abf4-100b9e5f7447" xlink:to="loc_aon_FixedIncomeInvestmentsPooledFundsMember_7a35bdce-3803-4a72-bd11-ad189c8d8196" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_RealEstateAndRealEstateInvestmentTrustMember_ab5d0642-1249-4892-90de-a5037f9c8327" xlink:href="aon-20201231.xsd#aon_RealEstateAndRealEstateInvestmentTrustMember"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_6b307e45-5228-4148-abf4-100b9e5f7447" xlink:to="loc_aon_RealEstateAndRealEstateInvestmentTrustMember_ab5d0642-1249-4892-90de-a5037f9c8327" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_AlternativeInvestmentsMember_bb49ced2-61b8-4971-872c-d89b6945c22a" xlink:href="aon-20201231.xsd#aon_AlternativeInvestmentsMember"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_6b307e45-5228-4148-abf4-100b9e5f7447" xlink:to="loc_aon_AlternativeInvestmentsMember_bb49ced2-61b8-4971-872c-d89b6945c22a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0dd2f177-03db-45c6-a11d-5b3406bcdc83" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_d6cc9ad5-3c02-4a8e-9cbd-9c9141a2809a" xlink:to="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0dd2f177-03db-45c6-a11d-5b3406bcdc83" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_f854c70f-e98d-419a-9e71-251bfed2eb30" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_0dd2f177-03db-45c6-a11d-5b3406bcdc83" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_f854c70f-e98d-419a-9e71-251bfed2eb30" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsScheduleofFairValueofUKPlanAssetsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsScheduleofFairValueofUKPlanAssetsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsScheduleofFairValueofUKPlanAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_befe560f-2b22-4522-be5a-fe9d56e15ab5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_dda48e88-d6f8-4b43-92f8-c2db8d9b8e94" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_befe560f-2b22-4522-be5a-fe9d56e15ab5" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_dda48e88-d6f8-4b43-92f8-c2db8d9b8e94" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_f68f4eef-35bb-4b51-8b52-665f517b0681" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_dda48e88-d6f8-4b43-92f8-c2db8d9b8e94" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_f68f4eef-35bb-4b51-8b52-665f517b0681" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_1ed5801f-2342-47d6-b5b4-c5f05dd22311" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_f68f4eef-35bb-4b51-8b52-665f517b0681" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_1ed5801f-2342-47d6-b5b4-c5f05dd22311" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_372bced1-91bd-48bc-8536-81e29e5d56d2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_1ed5801f-2342-47d6-b5b4-c5f05dd22311" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_372bced1-91bd-48bc-8536-81e29e5d56d2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_1c8b6edf-128c-4dad-86a4-6bc78f3bfe60" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_dda48e88-d6f8-4b43-92f8-c2db8d9b8e94" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_1c8b6edf-128c-4dad-86a4-6bc78f3bfe60" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_0e371aaa-c411-4061-9696-5586c8fbf3c0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_1c8b6edf-128c-4dad-86a4-6bc78f3bfe60" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_0e371aaa-c411-4061-9696-5586c8fbf3c0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_128cdcf1-db58-45e8-836e-61f7ca2c9f97" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_0e371aaa-c411-4061-9696-5586c8fbf3c0" xlink:to="loc_us-gaap_ForeignPlanMember_128cdcf1-db58-45e8-836e-61f7ca2c9f97" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_3bf69bcf-4b61-4b47-b21c-da8a269f9de3" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_128cdcf1-db58-45e8-836e-61f7ca2c9f97" xlink:to="loc_country_GB_3bf69bcf-4b61-4b47-b21c-da8a269f9de3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c26994c7-69b0-4ee8-a2c7-4ba45821ff78" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_dda48e88-d6f8-4b43-92f8-c2db8d9b8e94" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c26994c7-69b0-4ee8-a2c7-4ba45821ff78" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4a8f90ec-13ff-45c9-b0b5-60641a06abc2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_c26994c7-69b0-4ee8-a2c7-4ba45821ff78" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4a8f90ec-13ff-45c9-b0b5-60641a06abc2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_e86ecf0b-5d69-45a7-8f5e-d25f8c75d1de" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4a8f90ec-13ff-45c9-b0b5-60641a06abc2" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_e86ecf0b-5d69-45a7-8f5e-d25f8c75d1de" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_0f14f966-7a9f-46db-a9af-ac16943a6597" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4a8f90ec-13ff-45c9-b0b5-60641a06abc2" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_0f14f966-7a9f-46db-a9af-ac16943a6597" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_187bbd01-137a-4d3f-be68-7c8b07c0073a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_4a8f90ec-13ff-45c9-b0b5-60641a06abc2" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_187bbd01-137a-4d3f-be68-7c8b07c0073a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_a606dc59-3314-4796-9bd0-96e2d5d18270" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_dda48e88-d6f8-4b43-92f8-c2db8d9b8e94" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_a606dc59-3314-4796-9bd0-96e2d5d18270" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_05e20477-68cf-4817-8e09-c9c2690a2a3a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_a606dc59-3314-4796-9bd0-96e2d5d18270" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_05e20477-68cf-4817-8e09-c9c2690a2a3a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_1c4b68ca-5d92-4d34-ad85-5c25a68bf68b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_05e20477-68cf-4817-8e09-c9c2690a2a3a" xlink:to="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_1c4b68ca-5d92-4d34-ad85-5c25a68bf68b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_EquityInvestmentsPooledFundsMember_322a27db-179a-4fb4-9adc-f98e91ebcb5a" xlink:href="aon-20201231.xsd#aon_EquityInvestmentsPooledFundsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_05e20477-68cf-4817-8e09-c9c2690a2a3a" xlink:to="loc_aon_EquityInvestmentsPooledFundsMember_322a27db-179a-4fb4-9adc-f98e91ebcb5a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDerivativeMember_2d8454b7-7e6b-42d1-ba8f-7f4737133807" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanDerivativeMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_05e20477-68cf-4817-8e09-c9c2690a2a3a" xlink:to="loc_us-gaap_DefinedBenefitPlanDerivativeMember_2d8454b7-7e6b-42d1-ba8f-7f4737133807" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateBondSecuritiesMember_ec73cf61-33a1-4b48-9378-9cdac0fbfbe6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CorporateBondSecuritiesMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_05e20477-68cf-4817-8e09-c9c2690a2a3a" xlink:to="loc_us-gaap_CorporateBondSecuritiesMember_ec73cf61-33a1-4b48-9378-9cdac0fbfbe6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_GovernmentAndAgencyBondsMember_5c30bc70-1060-4805-afe0-f0e280e7f8a7" xlink:href="aon-20201231.xsd#aon_GovernmentAndAgencyBondsMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_05e20477-68cf-4817-8e09-c9c2690a2a3a" xlink:to="loc_aon_GovernmentAndAgencyBondsMember_5c30bc70-1060-4805-afe0-f0e280e7f8a7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_AnnuitiesMember_ddd9c557-d1a1-4f15-9ba0-23b043ba4c0c" xlink:href="aon-20201231.xsd#aon_AnnuitiesMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_05e20477-68cf-4817-8e09-c9c2690a2a3a" xlink:to="loc_aon_AnnuitiesMember_ddd9c557-d1a1-4f15-9ba0-23b043ba4c0c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FixedIncomeInvestmentsPooledFundsMember_80249c80-b555-4c22-8deb-5bc7510366eb" xlink:href="aon-20201231.xsd#aon_FixedIncomeInvestmentsPooledFundsMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_05e20477-68cf-4817-8e09-c9c2690a2a3a" xlink:to="loc_aon_FixedIncomeInvestmentsPooledFundsMember_80249c80-b555-4c22-8deb-5bc7510366eb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_RealEstateAndRealEstateInvestmentTrustMember_4b1116e5-f548-48c6-b615-291dbfc535f0" xlink:href="aon-20201231.xsd#aon_RealEstateAndRealEstateInvestmentTrustMember"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_05e20477-68cf-4817-8e09-c9c2690a2a3a" xlink:to="loc_aon_RealEstateAndRealEstateInvestmentTrustMember_4b1116e5-f548-48c6-b615-291dbfc535f0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherInvestmentsPooledFundsMember_4920d286-a50e-4bc4-8b63-7965d0a44b9a" xlink:href="aon-20201231.xsd#aon_OtherInvestmentsPooledFundsMember"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_05e20477-68cf-4817-8e09-c9c2690a2a3a" xlink:to="loc_aon_OtherInvestmentsPooledFundsMember_4920d286-a50e-4bc4-8b63-7965d0a44b9a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_3149fef2-ca4b-40e0-8a8d-7ab8e5f9cf63" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_dda48e88-d6f8-4b43-92f8-c2db8d9b8e94" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_3149fef2-ca4b-40e0-8a8d-7ab8e5f9cf63" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_ed41eb7a-7bc9-437d-9e6d-58ab54bf1aaa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_3149fef2-ca4b-40e0-8a8d-7ab8e5f9cf63" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_ed41eb7a-7bc9-437d-9e6d-58ab54bf1aaa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsScheduleofchangesinLevel3fairvalueforUKPensionPlansDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsScheduleofchangesinLevel3fairvalueforUKPensionPlansDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsScheduleofchangesinLevel3fairvalueforUKPensionPlansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_6a32cd7a-ffa6-4cae-935d-33bebf6dee10" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_ed6c339b-4956-4f4c-83ac-b5bd8ef148fd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_6a32cd7a-ffa6-4cae-935d-33bebf6dee10" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_ed6c339b-4956-4f4c-83ac-b5bd8ef148fd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_46f6062b-5631-47a4-a484-f2560e4bfa6b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_ed6c339b-4956-4f4c-83ac-b5bd8ef148fd" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_46f6062b-5631-47a4-a484-f2560e4bfa6b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_959d88c0-a462-4d5d-88bc-da925553979d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_46f6062b-5631-47a4-a484-f2560e4bfa6b" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_959d88c0-a462-4d5d-88bc-da925553979d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_0bfc3a2c-3f4b-4e0d-b233-e6d12349732b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_959d88c0-a462-4d5d-88bc-da925553979d" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_0bfc3a2c-3f4b-4e0d-b233-e6d12349732b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_a58a5faf-7fc1-4aeb-b2ce-ca57ac1932c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_ed6c339b-4956-4f4c-83ac-b5bd8ef148fd" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_a58a5faf-7fc1-4aeb-b2ce-ca57ac1932c4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_4c002e72-6532-4cf8-822f-90bc3781cd85" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_a58a5faf-7fc1-4aeb-b2ce-ca57ac1932c4" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_4c002e72-6532-4cf8-822f-90bc3781cd85" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_e0019502-98fb-4642-b852-e6140eadc8e8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_4c002e72-6532-4cf8-822f-90bc3781cd85" xlink:to="loc_us-gaap_ForeignPlanMember_e0019502-98fb-4642-b852-e6140eadc8e8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_b8a8690f-15db-432f-b3b2-af8e6fe47c9f" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_e0019502-98fb-4642-b852-e6140eadc8e8" xlink:to="loc_country_GB_b8a8690f-15db-432f-b3b2-af8e6fe47c9f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_876ef7bd-1f8b-48f3-a495-72774c4cefab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_ed6c339b-4956-4f4c-83ac-b5bd8ef148fd" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_876ef7bd-1f8b-48f3-a495-72774c4cefab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_d269c8bf-e926-4782-be57-ec1d59582e70" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_876ef7bd-1f8b-48f3-a495-72774c4cefab" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_d269c8bf-e926-4782-be57-ec1d59582e70" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_380bac15-09c7-4dd1-97de-6f0289c40b79" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_d269c8bf-e926-4782-be57-ec1d59582e70" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_380bac15-09c7-4dd1-97de-6f0289c40b79" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_38361442-65b0-4434-9914-ed2a1f551350" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_ed6c339b-4956-4f4c-83ac-b5bd8ef148fd" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_38361442-65b0-4434-9914-ed2a1f551350" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_e5e5767b-37bf-4631-8dc6-cec5d0dbe75f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_38361442-65b0-4434-9914-ed2a1f551350" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_e5e5767b-37bf-4631-8dc6-cec5d0dbe75f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract_208ef701-2e3f-47ea-b26f-187bd053c911" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_e5e5767b-37bf-4631-8dc6-cec5d0dbe75f" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract_208ef701-2e3f-47ea-b26f-187bd053c911" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_01be9027-e205-450f-8b0c-1fd1945463b3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract_208ef701-2e3f-47ea-b26f-187bd053c911" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_01be9027-e205-450f-8b0c-1fd1945463b3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld_23ba579d-5f7e-49c2-a720-59477cd030ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract_208ef701-2e3f-47ea-b26f-187bd053c911" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsStillHeld_23ba579d-5f7e-49c2-a720-59477cd030ee" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements_ce307407-9ae9-4bd9-9430-544a3f91dddb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract_208ef701-2e3f-47ea-b26f-187bd053c911" xlink:to="loc_us-gaap_DefinedBenefitPlanPurchasesSalesAndSettlements_ce307407-9ae9-4bd9-9430-544a3f91dddb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_a872d663-2ecf-41b9-89e2-21a527d3f416" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract_208ef701-2e3f-47ea-b26f-187bd053c911" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_a872d663-2ecf-41b9-89e2-21a527d3f416" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_c14ae593-8fdc-4536-841d-7c4096435118" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssetsAbstract_208ef701-2e3f-47ea-b26f-187bd053c911" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_c14ae593-8fdc-4536-841d-7c4096435118" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsScheduleofFairValueofOtherPlanAssetsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsScheduleofFairValueofOtherPlanAssetsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsScheduleofFairValueofOtherPlanAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_9cb3f2b4-6e66-4641-b97d-fd87a94fd5a9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_fe1ab117-7a9f-4db2-936e-b037f2699d11" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_9cb3f2b4-6e66-4641-b97d-fd87a94fd5a9" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_fe1ab117-7a9f-4db2-936e-b037f2699d11" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_4ec70ea7-26ed-46ce-a7dd-0db6d925354f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_fe1ab117-7a9f-4db2-936e-b037f2699d11" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_4ec70ea7-26ed-46ce-a7dd-0db6d925354f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_946ef881-72d9-4ff1-9355-3f866fc4fe25" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_4ec70ea7-26ed-46ce-a7dd-0db6d925354f" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_946ef881-72d9-4ff1-9355-3f866fc4fe25" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_9fc73ab9-0aac-4dbe-8db9-08315a745005" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_946ef881-72d9-4ff1-9355-3f866fc4fe25" xlink:to="loc_us-gaap_ForeignPlanMember_9fc73ab9-0aac-4dbe-8db9-08315a745005" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_64888277-b7cd-431a-87c4-14339a9540fa" xlink:href="aon-20201231.xsd#aon_TheNetherlandsAndCanadaMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_9fc73ab9-0aac-4dbe-8db9-08315a745005" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_64888277-b7cd-431a-87c4-14339a9540fa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_ad79ee1b-8cb3-452f-b232-96ab0a3ffb6a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_fe1ab117-7a9f-4db2-936e-b037f2699d11" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_ad79ee1b-8cb3-452f-b232-96ab0a3ffb6a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_8d3fca78-631b-4cae-9030-6fdf326905a2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_ad79ee1b-8cb3-452f-b232-96ab0a3ffb6a" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_8d3fca78-631b-4cae-9030-6fdf326905a2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_bb7a4b9b-e522-4e53-8641-831c4658ef1c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_8d3fca78-631b-4cae-9030-6fdf326905a2" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_bb7a4b9b-e522-4e53-8641-831c4658ef1c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_497894b4-31a3-4a95-90b1-5d8e8350f271" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_fe1ab117-7a9f-4db2-936e-b037f2699d11" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_497894b4-31a3-4a95-90b1-5d8e8350f271" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bb1107a2-0d95-489e-9091-d05e5bccc584" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_497894b4-31a3-4a95-90b1-5d8e8350f271" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bb1107a2-0d95-489e-9091-d05e5bccc584" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_967205b4-c06e-416c-acb0-240289715279" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bb1107a2-0d95-489e-9091-d05e5bccc584" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_967205b4-c06e-416c-acb0-240289715279" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_c82f3a9a-a920-4be9-bd33-51de2af50f0c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bb1107a2-0d95-489e-9091-d05e5bccc584" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_c82f3a9a-a920-4be9-bd33-51de2af50f0c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_ba4d32c4-c45a-426e-9344-b337590d0ac6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_bb1107a2-0d95-489e-9091-d05e5bccc584" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_ba4d32c4-c45a-426e-9344-b337590d0ac6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_2465329f-e3df-4da2-9186-92eb52a1c19b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_fe1ab117-7a9f-4db2-936e-b037f2699d11" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_2465329f-e3df-4da2-9186-92eb52a1c19b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_4882539d-ebb8-4520-8d6e-0aa37a3dc637" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_2465329f-e3df-4da2-9186-92eb52a1c19b" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_4882539d-ebb8-4520-8d6e-0aa37a3dc637" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_1dd68c1d-617a-45ad-8134-bc6b5e3d2f27" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_4882539d-ebb8-4520-8d6e-0aa37a3dc637" xlink:to="loc_us-gaap_DefinedBenefitPlanCashAndCashEquivalentsMember_1dd68c1d-617a-45ad-8134-bc6b5e3d2f27" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_25ee42b8-5d09-4a18-b528-8d3fa0272eac" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_4882539d-ebb8-4520-8d6e-0aa37a3dc637" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_25ee42b8-5d09-4a18-b528-8d3fa0272eac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_EquityInvestmentsPooledFundsMember_4e9c5b8c-a12b-458b-969b-509f162f17dc" xlink:href="aon-20201231.xsd#aon_EquityInvestmentsPooledFundsMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_4882539d-ebb8-4520-8d6e-0aa37a3dc637" xlink:to="loc_aon_EquityInvestmentsPooledFundsMember_4e9c5b8c-a12b-458b-969b-509f162f17dc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_GovernmentAndAgencyBondsMember_cfff6cf4-6f8e-44e3-9dd1-11c0c784e4da" xlink:href="aon-20201231.xsd#aon_GovernmentAndAgencyBondsMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_4882539d-ebb8-4520-8d6e-0aa37a3dc637" xlink:to="loc_aon_GovernmentAndAgencyBondsMember_cfff6cf4-6f8e-44e3-9dd1-11c0c784e4da" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FixedIncomeInvestmentsPooledFundsMember_b775d91d-9be0-4f0b-b052-8a39eba3eb01" xlink:href="aon-20201231.xsd#aon_FixedIncomeInvestmentsPooledFundsMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_4882539d-ebb8-4520-8d6e-0aa37a3dc637" xlink:to="loc_aon_FixedIncomeInvestmentsPooledFundsMember_b775d91d-9be0-4f0b-b052-8a39eba3eb01" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_AlternativeInvestmentsMember_df0c9a19-5658-46b7-9735-ecf4f31b8951" xlink:href="aon-20201231.xsd#aon_AlternativeInvestmentsMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_4882539d-ebb8-4520-8d6e-0aa37a3dc637" xlink:to="loc_aon_AlternativeInvestmentsMember_df0c9a19-5658-46b7-9735-ecf4f31b8951" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_RealEstateAndRealEstateInvestmentTrustMember_2366eacf-3895-4a97-8fe9-6db89c1e26ee" xlink:href="aon-20201231.xsd#aon_RealEstateAndRealEstateInvestmentTrustMember"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_4882539d-ebb8-4520-8d6e-0aa37a3dc637" xlink:to="loc_aon_RealEstateAndRealEstateInvestmentTrustMember_2366eacf-3895-4a97-8fe9-6db89c1e26ee" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_8c32982a-1d0e-4bb9-8748-c60ccf001a59" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_fe1ab117-7a9f-4db2-936e-b037f2699d11" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_8c32982a-1d0e-4bb9-8748-c60ccf001a59" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_2f1c65c3-4ca4-4972-bde2-e013a13b6680" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_8c32982a-1d0e-4bb9-8748-c60ccf001a59" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_2f1c65c3-4ca4-4972-bde2-e013a13b6680" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsInvestmentPolicyandStrategyNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsInvestmentPolicyandStrategyNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsInvestmentPolicyandStrategyNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_0943f515-1944-4d8f-89c9-1f6a75189406" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_a50def3a-d7a8-4cd2-aef0-39d8c7e03e10" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_0943f515-1944-4d8f-89c9-1f6a75189406" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_a50def3a-d7a8-4cd2-aef0-39d8c7e03e10" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_8098180b-9cb1-46bf-868c-488258f99f58" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_a50def3a-d7a8-4cd2-aef0-39d8c7e03e10" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_8098180b-9cb1-46bf-868c-488258f99f58" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_11b77e70-84ba-42ed-bb68-d7be9b908805" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_8098180b-9cb1-46bf-868c-488258f99f58" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_11b77e70-84ba-42ed-bb68-d7be9b908805" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_6917d907-c51c-489c-a1ec-5e9176e75d81" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_11b77e70-84ba-42ed-bb68-d7be9b908805" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_6917d907-c51c-489c-a1ec-5e9176e75d81" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_707867dc-d8a7-4f23-ab73-8caa2f510811" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_a50def3a-d7a8-4cd2-aef0-39d8c7e03e10" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_707867dc-d8a7-4f23-ab73-8caa2f510811" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_09aa6178-82d0-4300-8f64-155b87d2723b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_707867dc-d8a7-4f23-ab73-8caa2f510811" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_09aa6178-82d0-4300-8f64-155b87d2723b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_0ceb28b1-488f-4b82-a386-d14b8e28cf01" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_09aa6178-82d0-4300-8f64-155b87d2723b" xlink:to="loc_us-gaap_DomesticPlanMember_0ceb28b1-488f-4b82-a386-d14b8e28cf01" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_0b0c8fdb-b28c-4274-a675-cd236ee74b83" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_0ceb28b1-488f-4b82-a386-d14b8e28cf01" xlink:to="loc_country_US_0b0c8fdb-b28c-4274-a675-cd236ee74b83" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_b1e9ffb2-48d2-4572-ae41-39ad63b83f35" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignPlanMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_09aa6178-82d0-4300-8f64-155b87d2723b" xlink:to="loc_us-gaap_ForeignPlanMember_b1e9ffb2-48d2-4572-ae41-39ad63b83f35" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_bb7fd07e-dabf-4cd1-87a4-1b2ad8c79618" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_a50def3a-d7a8-4cd2-aef0-39d8c7e03e10" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_bb7fd07e-dabf-4cd1-87a4-1b2ad8c79618" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_da43c757-cf23-4ea2-8576-731c7c19c01c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_bb7fd07e-dabf-4cd1-87a4-1b2ad8c79618" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_da43c757-cf23-4ea2-8576-731c7c19c01c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_74f4725a-f4b9-4216-af0a-ffeefc70e722" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_da43c757-cf23-4ea2-8576-731c7c19c01c" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_74f4725a-f4b9-4216-af0a-ffeefc70e722" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FixedIncomeInvestmentsMember_d3e61673-3ab7-475c-9e53-acdff85f8008" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FixedIncomeInvestmentsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_da43c757-cf23-4ea2-8576-731c7c19c01c" xlink:to="loc_us-gaap_FixedIncomeInvestmentsMember_d3e61673-3ab7-475c-9e53-acdff85f8008" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLongTermInvestmentsMember_21a74809-57bc-422d-a2fc-eefb82b1af41" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherLongTermInvestmentsMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_da43c757-cf23-4ea2-8576-731c7c19c01c" xlink:to="loc_us-gaap_OtherLongTermInvestmentsMember_21a74809-57bc-422d-a2fc-eefb82b1af41" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_67841f5c-a125-4c34-ada0-99e9d0b7595c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_a50def3a-d7a8-4cd2-aef0-39d8c7e03e10" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_67841f5c-a125-4c34-ada0-99e9d0b7595c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_8a04d28d-91cc-403c-ac2b-092fed8d795d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_67841f5c-a125-4c34-ada0-99e9d0b7595c" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_8a04d28d-91cc-403c-ac2b-092fed8d795d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_1b595f0d-da2b-488f-8a68-84fb86b6d9b7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_67841f5c-a125-4c34-ada0-99e9d0b7595c" xlink:to="loc_us-gaap_DefinedBenefitPlanWeightedAverageAssetAllocations_1b595f0d-da2b-488f-8a68-84fb86b6d9b7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsCashFlowsNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsCashFlowsNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsCashFlowsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_dfdf5053-da79-4c31-aa8c-57e05e405cf3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_ba2af7e7-c165-4201-ac12-b4f0aca4d745" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_dfdf5053-da79-4c31-aa8c-57e05e405cf3" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_ba2af7e7-c165-4201-ac12-b4f0aca4d745" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_02eed519-1d3b-4527-8dc6-1270d7d79b4b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_ba2af7e7-c165-4201-ac12-b4f0aca4d745" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_02eed519-1d3b-4527-8dc6-1270d7d79b4b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_4ca9fec6-28f3-4e41-87ab-2ec19ba5ef39" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_02eed519-1d3b-4527-8dc6-1270d7d79b4b" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_4ca9fec6-28f3-4e41-87ab-2ec19ba5ef39" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_10917b6e-208c-4674-ac52-377bd15fb559" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_4ca9fec6-28f3-4e41-87ab-2ec19ba5ef39" xlink:to="loc_us-gaap_DomesticPlanMember_10917b6e-208c-4674-ac52-377bd15fb559" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_3c45b2bb-cfa1-4c00-838c-f5c6746476b5" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_10917b6e-208c-4674-ac52-377bd15fb559" xlink:to="loc_country_US_3c45b2bb-cfa1-4c00-838c-f5c6746476b5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_b473b143-1749-4773-b2ee-3e61e715b2a3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignPlanMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_4ca9fec6-28f3-4e41-87ab-2ec19ba5ef39" xlink:to="loc_us-gaap_ForeignPlanMember_b473b143-1749-4773-b2ee-3e61e715b2a3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_ceeb74de-2fd3-418f-8297-b28adf1809e5" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_b473b143-1749-4773-b2ee-3e61e715b2a3" xlink:to="loc_country_GB_ceeb74de-2fd3-418f-8297-b28adf1809e5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_39c026d9-ba8e-40d9-b16d-78168302d294" xlink:href="aon-20201231.xsd#aon_TheNetherlandsAndCanadaMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_b473b143-1749-4773-b2ee-3e61e715b2a3" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_39c026d9-ba8e-40d9-b16d-78168302d294" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_4b965442-e2c8-4d90-a29b-0b6a791037bf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_ba2af7e7-c165-4201-ac12-b4f0aca4d745" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_4b965442-e2c8-4d90-a29b-0b6a791037bf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_d8ecbcd7-aba0-43ef-9b02-1d00552e53e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_4b965442-e2c8-4d90-a29b-0b6a791037bf" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_d8ecbcd7-aba0-43ef-9b02-1d00552e53e3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_84169089-2daa-4c19-bc16-3c9647db1f73" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_d8ecbcd7-aba0-43ef-9b02-1d00552e53e3" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_84169089-2daa-4c19-bc16-3c9647db1f73" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_82f51f46-a06b-475b-b25d-c27131b673c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_d8ecbcd7-aba0-43ef-9b02-1d00552e53e3" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_82f51f46-a06b-475b-b25d-c27131b673c4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_762a79f8-d11a-428e-b62a-c0446130d903" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_ba2af7e7-c165-4201-ac12-b4f0aca4d745" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_762a79f8-d11a-428e-b62a-c0446130d903" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear_f10fca00-4dcb-49ad-b4a2-9ee8f5cc58fe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_762a79f8-d11a-428e-b62a-c0446130d903" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfPriorServiceCostCreditNextFiscalYear_f10fca00-4dcb-49ad-b4a2-9ee8f5cc58fe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_2a2eee4e-f70a-42f9-9616-ed9d2d895962" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_762a79f8-d11a-428e-b62a-c0446130d903" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_2a2eee4e-f70a-42f9-9616-ed9d2d895962" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_6f33f45c-0d41-41cf-9e21-0b7b42a36a59" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_762a79f8-d11a-428e-b62a-c0446130d903" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_6f33f45c-0d41-41cf-9e21-0b7b42a36a59" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsEstimatedFutureBenefitPaymentsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsEstimatedFutureBenefitPaymentsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsEstimatedFutureBenefitPaymentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_415ce34c-737c-4a3c-bf1b-dfe885066f11" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_fd881714-3c35-4d79-be06-ef298532277e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_415ce34c-737c-4a3c-bf1b-dfe885066f11" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_fd881714-3c35-4d79-be06-ef298532277e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_0b4fd73e-93b9-46e2-882a-26c3927a2455" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_fd881714-3c35-4d79-be06-ef298532277e" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_0b4fd73e-93b9-46e2-882a-26c3927a2455" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_c1c8387c-7387-46e4-ab1b-562b808c9ff3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_0b4fd73e-93b9-46e2-882a-26c3927a2455" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_c1c8387c-7387-46e4-ab1b-562b808c9ff3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticPlanMember_2c34ae7c-53f2-43bb-8cfd-86360a05460e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DomesticPlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_c1c8387c-7387-46e4-ab1b-562b808c9ff3" xlink:to="loc_us-gaap_DomesticPlanMember_2c34ae7c-53f2-43bb-8cfd-86360a05460e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_230cf774-223e-4a5d-a2c4-a33189454414" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DomesticPlanMember_2c34ae7c-53f2-43bb-8cfd-86360a05460e" xlink:to="loc_country_US_230cf774-223e-4a5d-a2c4-a33189454414" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_0d0b36c1-95b0-4081-86cc-e32c896a6a82" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignPlanMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_c1c8387c-7387-46e4-ab1b-562b808c9ff3" xlink:to="loc_us-gaap_ForeignPlanMember_0d0b36c1-95b0-4081-86cc-e32c896a6a82" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_96af3491-329d-40b0-8b9a-eabff3316b90" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_0d0b36c1-95b0-4081-86cc-e32c896a6a82" xlink:to="loc_country_GB_96af3491-329d-40b0-8b9a-eabff3316b90" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TheNetherlandsAndCanadaMember_ddc0dbd6-13c6-422e-bc34-92b40b00b6f9" xlink:href="aon-20201231.xsd#aon_TheNetherlandsAndCanadaMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ForeignPlanMember_0d0b36c1-95b0-4081-86cc-e32c896a6a82" xlink:to="loc_aon_TheNetherlandsAndCanadaMember_ddc0dbd6-13c6-422e-bc34-92b40b00b6f9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_90bf6342-5dd9-460e-8fdd-67376d6c7c8e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_fd881714-3c35-4d79-be06-ef298532277e" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_90bf6342-5dd9-460e-8fdd-67376d6c7c8e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_3ff30dac-064b-4af9-b12d-2a8ee9020982" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_90bf6342-5dd9-460e-8fdd-67376d6c7c8e" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_3ff30dac-064b-4af9-b12d-2a8ee9020982" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_c35a8795-d710-41df-b858-bb7efb226123" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_3ff30dac-064b-4af9-b12d-2a8ee9020982" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_c35a8795-d710-41df-b858-bb7efb226123" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_22d39d2c-052d-4f58-bd6f-47d89e4629d2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_fd881714-3c35-4d79-be06-ef298532277e" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_22d39d2c-052d-4f58-bd6f-47d89e4629d2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_796aa22a-5824-4424-bc2a-46c5385ceafa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_22d39d2c-052d-4f58-bd6f-47d89e4629d2" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_796aa22a-5824-4424-bc2a-46c5385ceafa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_c2b33eb1-5aba-4aaf-9f97-74b124db282c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_22d39d2c-052d-4f58-bd6f-47d89e4629d2" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_c2b33eb1-5aba-4aaf-9f97-74b124db282c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_6a217df1-1318-4edc-bc61-5719d961bd6b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_22d39d2c-052d-4f58-bd6f-47d89e4629d2" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_6a217df1-1318-4edc-bc61-5719d961bd6b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_27adf452-5229-4aac-a494-191830a6a06d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_22d39d2c-052d-4f58-bd6f-47d89e4629d2" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_27adf452-5229-4aac-a494-191830a6a06d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_6a6da6a4-486c-4d8d-8434-bb373e488b02" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_22d39d2c-052d-4f58-bd6f-47d89e4629d2" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_6a6da6a4-486c-4d8d-8434-bb373e488b02" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_41608d89-a69b-4f9f-96d9-7b4971555e82" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_22d39d2c-052d-4f58-bd6f-47d89e4629d2" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_41608d89-a69b-4f9f-96d9-7b4971555e82" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsOverviewoftheaccumulatedbenefitobligationfairvalueofplanassetsfundedstatusandnetamountrecognizedforUSandCanadianOtherPostRetirementBenefitsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsOverviewoftheaccumulatedbenefitobligationfairvalueofplanassetsfundedstatusandnetamountrecognizedforUSandCanadianOtherPostRetirementBenefitsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsOverviewoftheaccumulatedbenefitobligationfairvalueofplanassetsfundedstatusandnetamountrecognizedforUSandCanadianOtherPostRetirementBenefitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_2082bc0e-d939-4cf7-aa7e-fcb541ddceb4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_048a1ce6-fb8d-46a9-8b18-0e1de69b003f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_2082bc0e-d939-4cf7-aa7e-fcb541ddceb4" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_048a1ce6-fb8d-46a9-8b18-0e1de69b003f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_107102a0-3050-440e-8fd0-46289b5d3c9d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_048a1ce6-fb8d-46a9-8b18-0e1de69b003f" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_107102a0-3050-440e-8fd0-46289b5d3c9d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_f8061d84-742c-42c4-8a77-6ed71021cd62" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_107102a0-3050-440e-8fd0-46289b5d3c9d" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_f8061d84-742c-42c4-8a77-6ed71021cd62" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_138633c5-7b45-4688-a030-dbfa5ba06501" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_f8061d84-742c-42c4-8a77-6ed71021cd62" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_138633c5-7b45-4688-a030-dbfa5ba06501" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7c9135ce-c905-469c-93f8-25016525ce30" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_048a1ce6-fb8d-46a9-8b18-0e1de69b003f" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7c9135ce-c905-469c-93f8-25016525ce30" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_747e4b45-34ad-47cd-8947-1d2fb9326a9a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7c9135ce-c905-469c-93f8-25016525ce30" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_747e4b45-34ad-47cd-8947-1d2fb9326a9a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_0f26c874-600d-42c3-8153-3fc6802bc8e3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7c9135ce-c905-469c-93f8-25016525ce30" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_0f26c874-600d-42c3-8153-3fc6802bc8e3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_483254a0-b55f-48c2-a697-1699d7cf94c0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7c9135ce-c905-469c-93f8-25016525ce30" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_483254a0-b55f-48c2-a697-1699d7cf94c0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_8b082090-22c7-4b84-9815-357d0ba6a808" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7c9135ce-c905-469c-93f8-25016525ce30" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_8b082090-22c7-4b84-9815-357d0ba6a808" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/netLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_83be3a93-5f2a-4e76-bb9f-552c375b3cb3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7c9135ce-c905-469c-93f8-25016525ce30" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_83be3a93-5f2a-4e76-bb9f-552c375b3cb3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_5e3d8712-ed8b-487a-9917-b493b467b8db" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7c9135ce-c905-469c-93f8-25016525ce30" xlink:to="loc_us-gaap_DefinedBenefitPlanAmountsRecognizedInBalanceSheet_5e3d8712-ed8b-487a-9917-b493b467b8db" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsScheduleofOtherinformationrelatedtoCompanysotherpostretirementplansDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsScheduleofOtherinformationrelatedtoCompanysotherpostretirementplansDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsScheduleofOtherinformationrelatedtoCompanysotherpostretirementplansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_38a14b89-3ad5-402f-b45a-6ece588e8636" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_2fbf7e2d-ab83-4e12-b584-5b1d955bb73c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_38a14b89-3ad5-402f-b45a-6ece588e8636" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_2fbf7e2d-ab83-4e12-b584-5b1d955bb73c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_31b72352-ee23-46a4-bfbf-8fbb5751963d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_2fbf7e2d-ab83-4e12-b584-5b1d955bb73c" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_31b72352-ee23-46a4-bfbf-8fbb5751963d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_8a601911-45e0-4fb9-8279-b84738de19c6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_31b72352-ee23-46a4-bfbf-8fbb5751963d" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_8a601911-45e0-4fb9-8279-b84738de19c6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_11dac599-4f7c-4a9d-94e9-cdfe426e60ee" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_8a601911-45e0-4fb9-8279-b84738de19c6" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_11dac599-4f7c-4a9d-94e9-cdfe426e60ee" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_b78d270e-95c9-4581-b6c0-90c68827e1ac" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_2fbf7e2d-ab83-4e12-b584-5b1d955bb73c" xlink:to="loc_srt_RangeAxis_b78d270e-95c9-4581-b6c0-90c68827e1ac" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e5eeed5c-af1f-4902-b340-85a42a4fa992" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_b78d270e-95c9-4581-b6c0-90c68827e1ac" xlink:to="loc_srt_RangeMember_e5eeed5c-af1f-4902-b340-85a42a4fa992" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_9f98c1ee-724f-4c09-b37d-d3cd75650151" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_e5eeed5c-af1f-4902-b340-85a42a4fa992" xlink:to="loc_srt_MinimumMember_9f98c1ee-724f-4c09-b37d-d3cd75650151" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_a5936351-6816-4611-98ed-8d8ae1ab7856" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_e5eeed5c-af1f-4902-b340-85a42a4fa992" xlink:to="loc_srt_MaximumMember_a5936351-6816-4611-98ed-8d8ae1ab7856" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_24cce23f-3ab4-4603-8460-82a19788b4f7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_2fbf7e2d-ab83-4e12-b584-5b1d955bb73c" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_24cce23f-3ab4-4603-8460-82a19788b4f7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_8114f7a8-d3f1-42de-bcec-1718faa01c67" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_24cce23f-3ab4-4603-8460-82a19788b4f7" xlink:to="loc_us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost_8114f7a8-d3f1-42de-bcec-1718faa01c67" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_48dc869b-e185-4577-8455-a1fbf953172d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_24cce23f-3ab4-4603-8460-82a19788b4f7" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_48dc869b-e185-4577-8455-a1fbf953172d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_d487427a-15d8-4ad5-8a84-2d8091d2ab76" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_24cce23f-3ab4-4603-8460-82a19788b4f7" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_d487427a-15d8-4ad5-8a84-2d8091d2ab76" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/EmployeeBenefitsUSandCanadianOtherPostRetirementBenefitsNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#EmployeeBenefitsUSandCanadianOtherPostRetirementBenefitsNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/EmployeeBenefitsUSandCanadianOtherPostRetirementBenefitsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_87d8d0fb-e684-4834-9240-15cc1a13b00b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CompensationAndRetirementDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_f7f8f38c-4c97-4cea-b8b2-ac89a747d60c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CompensationAndRetirementDisclosureAbstract_87d8d0fb-e684-4834-9240-15cc1a13b00b" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_f7f8f38c-4c97-4cea-b8b2-ac89a747d60c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_056ccd05-13f8-4daa-9cd3-4f6193a607c2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_f7f8f38c-4c97-4cea-b8b2-ac89a747d60c" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_056ccd05-13f8-4daa-9cd3-4f6193a607c2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_596e731a-602b-4361-bbb2-41288dc7c076" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_056ccd05-13f8-4daa-9cd3-4f6193a607c2" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_596e731a-602b-4361-bbb2-41288dc7c076" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_771f20b4-fadd-45ce-a67f-30f1e63027fe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_596e731a-602b-4361-bbb2-41288dc7c076" xlink:to="loc_us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember_771f20b4-fadd-45ce-a67f-30f1e63027fe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_029ca9ba-b998-484d-b5f3-7f1d2a2639b8" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_f7f8f38c-4c97-4cea-b8b2-ac89a747d60c" xlink:to="loc_srt_RangeAxis_029ca9ba-b998-484d-b5f3-7f1d2a2639b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_361a6f09-3799-4cb6-a6dc-3bb65a8bacbe" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_029ca9ba-b998-484d-b5f3-7f1d2a2639b8" xlink:to="loc_srt_RangeMember_361a6f09-3799-4cb6-a6dc-3bb65a8bacbe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_7a67f80e-5f99-41fe-b860-a94eba6704dd" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_361a6f09-3799-4cb6-a6dc-3bb65a8bacbe" xlink:to="loc_srt_MaximumMember_7a67f80e-5f99-41fe-b860-a94eba6704dd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_b904adee-8f01-482c-a717-07418abb8f17" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_361a6f09-3799-4cb6-a6dc-3bb65a8bacbe" xlink:to="loc_srt_MinimumMember_b904adee-8f01-482c-a717-07418abb8f17" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7a45cb3d-649d-4a19-b1a1-89676a4ebacc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_f7f8f38c-4c97-4cea-b8b2-ac89a747d60c" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7a45cb3d-649d-4a19-b1a1-89676a4ebacc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_c53df138-2a91-4bbf-a157-d2a7bf06935c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7a45cb3d-649d-4a19-b1a1-89676a4ebacc" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax_c53df138-2a91-4bbf-a157-d2a7bf06935c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_b1f3ccfd-7e28-4bbf-9daa-f30def0b398d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7a45cb3d-649d-4a19-b1a1-89676a4ebacc" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax_b1f3ccfd-7e28-4bbf-9daa-f30def0b398d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_db75bcb6-2ea1-467a-96c2-299698d37206" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7a45cb3d-649d-4a19-b1a1-89676a4ebacc" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedAmortizationOfGainLossNextFiscalYear_db75bcb6-2ea1-467a-96c2-299698d37206" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_6874983a-146e-42ae-8739-bc97768555b9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7a45cb3d-649d-4a19-b1a1-89676a4ebacc" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureEmployerContributionsNextFiscalYear_6874983a-146e-42ae-8739-bc97768555b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_c46cb61b-a894-4e3c-999c-261f671ae7eb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7a45cb3d-649d-4a19-b1a1-89676a4ebacc" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths_c46cb61b-a894-4e3c-999c-261f671ae7eb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_5c0931af-323e-4975-95f3-67df431e3bec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7a45cb3d-649d-4a19-b1a1-89676a4ebacc" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo_5c0931af-323e-4975-95f3-67df431e3bec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_8665bd39-6046-4bf2-a88a-4f4a32ca2727" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7a45cb3d-649d-4a19-b1a1-89676a4ebacc" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree_8665bd39-6046-4bf2-a88a-4f4a32ca2727" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_dc597d53-c1b3-4b06-8ca2-c10e63419dcc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7a45cb3d-649d-4a19-b1a1-89676a4ebacc" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour_dc597d53-c1b3-4b06-8ca2-c10e63419dcc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_5d69d68d-29db-42f3-947b-7a40f0ab466d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7a45cb3d-649d-4a19-b1a1-89676a4ebacc" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive_5d69d68d-29db-42f3-947b-7a40f0ab466d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_a4657505-562a-4550-bd00-7a656267a1b8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7a45cb3d-649d-4a19-b1a1-89676a4ebacc" xlink:to="loc_us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter_a4657505-562a-4550-bd00-7a656267a1b8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DefinedBenefitPlanPercentageofMedicalSupplementPlan_4363a9f2-caf9-4771-bcdb-8e7358ad9e75" xlink:href="aon-20201231.xsd#aon_DefinedBenefitPlanPercentageofMedicalSupplementPlan"/>
    <link:presentationArc order="11" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7a45cb3d-649d-4a19-b1a1-89676a4ebacc" xlink:to="loc_aon_DefinedBenefitPlanPercentageofMedicalSupplementPlan_4363a9f2-caf9-4771-bcdb-8e7358ad9e75" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_DefinedBenefitPlanMaximumPercentageofMedicalSupplementPlanIntoFuturePeriods_8828c70a-ae98-4616-abf6-3cbd0516388a" xlink:href="aon-20201231.xsd#aon_DefinedBenefitPlanMaximumPercentageofMedicalSupplementPlanIntoFuturePeriods"/>
    <link:presentationArc order="12" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_7a45cb3d-649d-4a19-b1a1-89676a4ebacc" xlink:to="loc_aon_DefinedBenefitPlanMaximumPercentageofMedicalSupplementPlanIntoFuturePeriods_8828c70a-ae98-4616-abf6-3cbd0516388a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ShareBasedCompensationPlans" xlink:type="simple" xlink:href="aon-20201231.xsd#ShareBasedCompensationPlans"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ShareBasedCompensationPlans" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_0bbc8082-75ba-4935-a771-698a098c1145" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_e588be0e-5f54-4a55-a6c9-0e1874502c09" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_0bbc8082-75ba-4935-a771-698a098c1145" xlink:to="loc_us-gaap_DisclosureOfCompensationRelatedCostsShareBasedPaymentsTextBlock_e588be0e-5f54-4a55-a6c9-0e1874502c09" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ShareBasedCompensationPlansTables" xlink:type="simple" xlink:href="aon-20201231.xsd#ShareBasedCompensationPlansTables"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ShareBasedCompensationPlansTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_6a64203b-c0bd-4140-bea5-bc4044d60cbb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock_2bf875d4-cacd-4533-abd0-d035c8e9d330" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_6a64203b-c0bd-4140-bea5-bc4044d60cbb" xlink:to="loc_us-gaap_ScheduleOfCompensationCostForShareBasedPaymentArrangementsAllocationOfShareBasedCompensationCostsByPlanTableTextBlock_2bf875d4-cacd-4533-abd0-d035c8e9d330" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock_5f3cf545-5588-4b8d-b357-340f02675929" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_6a64203b-c0bd-4140-bea5-bc4044d60cbb" xlink:to="loc_us-gaap_ScheduleOfNonvestedShareActivityTableTextBlock_5f3cf545-5588-4b8d-b357-340f02675929" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ScheduleofPerformanceBasedPlansTableTextBlock_44e8f8f7-360d-4279-8354-8e7751babd1a" xlink:href="aon-20201231.xsd#aon_ScheduleofPerformanceBasedPlansTableTextBlock"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_6a64203b-c0bd-4140-bea5-bc4044d60cbb" xlink:to="loc_aon_ScheduleofPerformanceBasedPlansTableTextBlock_44e8f8f7-360d-4279-8354-8e7751babd1a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ShareBasedCompensationPlansSharebasedcompensationexpenserecognizedincontinuingoperationsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#ShareBasedCompensationPlansSharebasedcompensationexpenserecognizedincontinuingoperationsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ShareBasedCompensationPlansSharebasedcompensationexpenserecognizedincontinuingoperationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_d7404468-a5f9-4927-ab4d-e37705a2d53a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_46fdc21e-8952-40f9-9202-1ba0ead41bd6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_d7404468-a5f9-4927-ab4d-e37705a2d53a" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_46fdc21e-8952-40f9-9202-1ba0ead41bd6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_751b9055-15d7-43c9-a597-8a488461de9d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_46fdc21e-8952-40f9-9202-1ba0ead41bd6" xlink:to="loc_us-gaap_AwardTypeAxis_751b9055-15d7-43c9-a597-8a488461de9d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ac32bcc8-3aca-421c-9777-ee1ce369b39a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_751b9055-15d7-43c9-a597-8a488461de9d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ac32bcc8-3aca-421c-9777-ee1ce369b39a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_0992e0c8-07f8-4b57-99bb-fffb1473da3c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ac32bcc8-3aca-421c-9777-ee1ce369b39a" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_0992e0c8-07f8-4b57-99bb-fffb1473da3c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_b56e2e00-006b-4dff-bb32-b5fa16379b10" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PerformanceSharesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ac32bcc8-3aca-421c-9777-ee1ce369b39a" xlink:to="loc_us-gaap_PerformanceSharesMember_b56e2e00-006b-4dff-bb32-b5fa16379b10" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_f7e40535-31b2-4bce-9c5b-f527e4738a31" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_46fdc21e-8952-40f9-9202-1ba0ead41bd6" xlink:to="loc_us-gaap_PlanNameAxis_f7e40535-31b2-4bce-9c5b-f527e4738a31" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_15282caa-b887-4d44-942a-6c8f1c5aac36" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameAxis_f7e40535-31b2-4bce-9c5b-f527e4738a31" xlink:to="loc_us-gaap_PlanNameDomain_15282caa-b887-4d44-942a-6c8f1c5aac36" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_EmployeeStockPurchasePlanMember_9d51c51a-62db-4632-a2b3-f11ff70395e0" xlink:href="aon-20201231.xsd#aon_EmployeeStockPurchasePlanMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_15282caa-b887-4d44-942a-6c8f1c5aac36" xlink:to="loc_aon_EmployeeStockPurchasePlanMember_9d51c51a-62db-4632-a2b3-f11ff70395e0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a033d501-4ea1-44e2-b59e-528f346f0d9d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_46fdc21e-8952-40f9-9202-1ba0ead41bd6" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a033d501-4ea1-44e2-b59e-528f346f0d9d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_ea365ac3-2344-4bb0-9161-e1a96bcee785" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a033d501-4ea1-44e2-b59e-528f346f0d9d" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_ea365ac3-2344-4bb0-9161-e1a96bcee785" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_4357a911-84e5-45ad-a582-7008d0cb00f2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a033d501-4ea1-44e2-b59e-528f346f0d9d" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_4357a911-84e5-45ad-a582-7008d0cb00f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_deb23110-c97a-4921-812e-e4445a41a6f0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_a033d501-4ea1-44e2-b59e-528f346f0d9d" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_deb23110-c97a-4921-812e-e4445a41a6f0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/totalLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ShareBasedCompensationPlansRestrictedShareUnitsNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#ShareBasedCompensationPlansRestrictedShareUnitsNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ShareBasedCompensationPlansRestrictedShareUnitsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_c5eafa27-320a-4d6c-845a-66ee71f4af67" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8ec6ad6a-3d0a-4dbf-816b-ef4bcc9d80bb" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_c5eafa27-320a-4d6c-845a-66ee71f4af67" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8ec6ad6a-3d0a-4dbf-816b-ef4bcc9d80bb" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_8932a910-57c8-45bc-bf1d-0659090bc3d9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8ec6ad6a-3d0a-4dbf-816b-ef4bcc9d80bb" xlink:to="loc_us-gaap_AwardTypeAxis_8932a910-57c8-45bc-bf1d-0659090bc3d9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_90f00bc5-26ec-4a14-94b6-3e794f2d0939" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_8932a910-57c8-45bc-bf1d-0659090bc3d9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_90f00bc5-26ec-4a14-94b6-3e794f2d0939" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_2524ba01-4dfb-4f07-952f-6a3c29e09f32" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_90f00bc5-26ec-4a14-94b6-3e794f2d0939" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_2524ba01-4dfb-4f07-952f-6a3c29e09f32" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_e1dd46e6-7802-4471-b04b-8434c720731c" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8ec6ad6a-3d0a-4dbf-816b-ef4bcc9d80bb" xlink:to="loc_srt_RangeAxis_e1dd46e6-7802-4471-b04b-8434c720731c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_8faa74ae-d16e-430c-a1fc-80c9c4fd9d84" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_e1dd46e6-7802-4471-b04b-8434c720731c" xlink:to="loc_srt_RangeMember_8faa74ae-d16e-430c-a1fc-80c9c4fd9d84" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_ae116655-f495-4e60-846c-40014171441f" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_8faa74ae-d16e-430c-a1fc-80c9c4fd9d84" xlink:to="loc_srt_MinimumMember_ae116655-f495-4e60-846c-40014171441f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_2f13519d-bbd6-497c-9bb3-d4879ddd4be9" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_8faa74ae-d16e-430c-a1fc-80c9c4fd9d84" xlink:to="loc_srt_MaximumMember_2f13519d-bbd6-497c-9bb3-d4879ddd4be9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4efa9362-64a7-40d2-892e-89e6f9b2e9c3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_8ec6ad6a-3d0a-4dbf-816b-ef4bcc9d80bb" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4efa9362-64a7-40d2-892e-89e6f9b2e9c3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_d2da25e6-7c5b-4fea-b9d9-8e6937687405" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4efa9362-64a7-40d2-892e-89e6f9b2e9c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_d2da25e6-7c5b-4fea-b9d9-8e6937687405" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_759e8912-9289-4db4-ab1d-40f85fe51f44" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4efa9362-64a7-40d2-892e-89e6f9b2e9c3" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalFairValue_759e8912-9289-4db4-ab1d-40f85fe51f44" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_fbb3498f-15aa-4271-bd3b-b3d67d7dd7a7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4efa9362-64a7-40d2-892e-89e6f9b2e9c3" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_fbb3498f-15aa-4271-bd3b-b3d67d7dd7a7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_90af6e68-7fb2-491c-9c56-e9f93a60ce55" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4efa9362-64a7-40d2-892e-89e6f9b2e9c3" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_90af6e68-7fb2-491c-9c56-e9f93a60ce55" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ShareBasedCompensationPlansSummaryofthestatusoftheCompanysRSUsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#ShareBasedCompensationPlansSummaryofthestatusoftheCompanysRSUsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ShareBasedCompensationPlansSummaryofthestatusoftheCompanysRSUsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_8db8cee5-8250-4576-beb2-09868dd5e69d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1cd72320-1a10-4b24-8a61-36ed3b2cfe5b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_8db8cee5-8250-4576-beb2-09868dd5e69d" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1cd72320-1a10-4b24-8a61-36ed3b2cfe5b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_bae4d7e2-b1c9-4330-8b85-3d8bcc48d870" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1cd72320-1a10-4b24-8a61-36ed3b2cfe5b" xlink:to="loc_us-gaap_AwardTypeAxis_bae4d7e2-b1c9-4330-8b85-3d8bcc48d870" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_acdb18c5-71e2-4a7e-b690-2d10d8e69f96" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_bae4d7e2-b1c9-4330-8b85-3d8bcc48d870" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_acdb18c5-71e2-4a7e-b690-2d10d8e69f96" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_98bdf07a-1c92-4310-a6bd-0fad7351dfea" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_acdb18c5-71e2-4a7e-b690-2d10d8e69f96" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_98bdf07a-1c92-4310-a6bd-0fad7351dfea" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_15b12fb3-b130-475a-ad6b-68282f5e0e21" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_1cd72320-1a10-4b24-8a61-36ed3b2cfe5b" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_15b12fb3-b130-475a-ad6b-68282f5e0e21" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_91eda39e-c9c7-49af-8908-19bb4c55d17f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_15b12fb3-b130-475a-ad6b-68282f5e0e21" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_91eda39e-c9c7-49af-8908-19bb4c55d17f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_272fc6ff-1cc0-4445-8093-1cacf43ba5ef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_91eda39e-c9c7-49af-8908-19bb4c55d17f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_272fc6ff-1cc0-4445-8093-1cacf43ba5ef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_2f9920df-47f9-4fcd-bf5d-74bd2226b4de" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_91eda39e-c9c7-49af-8908-19bb4c55d17f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_2f9920df-47f9-4fcd-bf5d-74bd2226b4de" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_c37ceb4d-ec77-4dd9-98b5-9e8c2fe1e63a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_91eda39e-c9c7-49af-8908-19bb4c55d17f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_c37ceb4d-ec77-4dd9-98b5-9e8c2fe1e63a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_c3d71cf8-f2b1-4238-88d7-d6b52b151562" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_91eda39e-c9c7-49af-8908-19bb4c55d17f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_c3d71cf8-f2b1-4238-88d7-d6b52b151562" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_e9728018-9af5-4945-99c7-bdd0ddd24d1f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_91eda39e-c9c7-49af-8908-19bb4c55d17f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_e9728018-9af5-4945-99c7-bdd0ddd24d1f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_d5d0b76a-d661-4555-a812-40f4ca0c0b2c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_15b12fb3-b130-475a-ad6b-68282f5e0e21" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_d5d0b76a-d661-4555-a812-40f4ca0c0b2c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_62a79d80-bb85-497a-9f07-3d1fb9eee261" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_d5d0b76a-d661-4555-a812-40f4ca0c0b2c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_62a79d80-bb85-497a-9f07-3d1fb9eee261" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodStartLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_c2f31ad2-9ca0-4da1-a622-baca1b2d9f04" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_d5d0b76a-d661-4555-a812-40f4ca0c0b2c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_c2f31ad2-9ca0-4da1-a622-baca1b2d9f04" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_0476db60-fa26-4d8f-bb78-9cbacbf4ddb0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_d5d0b76a-d661-4555-a812-40f4ca0c0b2c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_0476db60-fa26-4d8f-bb78-9cbacbf4ddb0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_748bd77b-fb1f-428f-888e-57c406ac8782" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_d5d0b76a-d661-4555-a812-40f4ca0c0b2c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue_748bd77b-fb1f-428f-888e-57c406ac8782" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_62476b1d-46b4-4ec0-843e-7f7587c2f7a0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsAdditionalDisclosuresAbstract_d5d0b76a-d661-4555-a812-40f4ca0c0b2c" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_62476b1d-46b4-4ec0-843e-7f7587c2f7a0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/periodEndLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ShareBasedCompensationPlansPerformanceShareAwardsNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#ShareBasedCompensationPlansPerformanceShareAwardsNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ShareBasedCompensationPlansPerformanceShareAwardsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_29ab0d71-0f14-45be-8ba2-c5fd5afd2649" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3f7a6817-9898-4431-a722-1a179fc6032d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_29ab0d71-0f14-45be-8ba2-c5fd5afd2649" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3f7a6817-9898-4431-a722-1a179fc6032d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_5aa28449-cfb1-47c8-b821-874d0701b13e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanNameAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3f7a6817-9898-4431-a722-1a179fc6032d" xlink:to="loc_us-gaap_PlanNameAxis_5aa28449-cfb1-47c8-b821-874d0701b13e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_7e98d75b-538f-470e-8823-af9d3b0e1aa7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameAxis_5aa28449-cfb1-47c8-b821-874d0701b13e" xlink:to="loc_us-gaap_PlanNameDomain_7e98d75b-538f-470e-8823-af9d3b0e1aa7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_LeadershipPerformancePlanCycle20172019Member_cf2e9a4e-2369-4e61-a71a-9c816955ee76" xlink:href="aon-20201231.xsd#aon_LeadershipPerformancePlanCycle20172019Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_7e98d75b-538f-470e-8823-af9d3b0e1aa7" xlink:to="loc_aon_LeadershipPerformancePlanCycle20172019Member_cf2e9a4e-2369-4e61-a71a-9c816955ee76" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_LeadershipPerformancePlanCycle20162018Member_f8da22ec-d982-4a49-8ae2-3893651ac3d3" xlink:href="aon-20201231.xsd#aon_LeadershipPerformancePlanCycle20162018Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_7e98d75b-538f-470e-8823-af9d3b0e1aa7" xlink:to="loc_aon_LeadershipPerformancePlanCycle20162018Member_f8da22ec-d982-4a49-8ae2-3893651ac3d3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_LeadershipPerformancePlanCycle20152017Member_e7301bb4-9ac1-4b0b-a0c9-fdba7ef4cda7" xlink:href="aon-20201231.xsd#aon_LeadershipPerformancePlanCycle20152017Member"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_PlanNameDomain_7e98d75b-538f-470e-8823-af9d3b0e1aa7" xlink:to="loc_aon_LeadershipPerformancePlanCycle20152017Member_e7301bb4-9ac1-4b0b-a0c9-fdba7ef4cda7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_e500f288-3828-4da3-a667-678373663e65" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3f7a6817-9898-4431-a722-1a179fc6032d" xlink:to="loc_us-gaap_AwardTypeAxis_e500f288-3828-4da3-a667-678373663e65" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_43813dd9-324d-4a41-9fd1-1766896f1d16" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_e500f288-3828-4da3-a667-678373663e65" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_43813dd9-324d-4a41-9fd1-1766896f1d16" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_3fefc579-25a8-4283-810b-745059e24017" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PerformanceSharesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_43813dd9-324d-4a41-9fd1-1766896f1d16" xlink:to="loc_us-gaap_PerformanceSharesMember_3fefc579-25a8-4283-810b-745059e24017" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_b7c9e509-0620-4c3b-a50e-7abd00f94170" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3f7a6817-9898-4431-a722-1a179fc6032d" xlink:to="loc_srt_RangeAxis_b7c9e509-0620-4c3b-a50e-7abd00f94170" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_8978df08-c831-46e8-81a6-874d25148573" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_b7c9e509-0620-4c3b-a50e-7abd00f94170" xlink:to="loc_srt_RangeMember_8978df08-c831-46e8-81a6-874d25148573" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_ae1b870f-0315-4642-a1fe-c987d9c6da10" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_8978df08-c831-46e8-81a6-874d25148573" xlink:to="loc_srt_MinimumMember_ae1b870f-0315-4642-a1fe-c987d9c6da10" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_f0a3b2f5-5767-4df5-8d4e-95aff998ef74" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_8978df08-c831-46e8-81a6-874d25148573" xlink:to="loc_srt_MaximumMember_f0a3b2f5-5767-4df5-8d4e-95aff998ef74" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_aadc5535-019a-455b-87fa-599e68c6986a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_3f7a6817-9898-4431-a722-1a179fc6032d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_aadc5535-019a-455b-87fa-599e68c6986a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingConditionsPeriod_bc9daa4f-ac10-4c83-bde6-e70bcf45ec16" xlink:href="aon-20201231.xsd#aon_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingConditionsPeriod"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_aadc5535-019a-455b-87fa-599e68c6986a" xlink:to="loc_aon_SharebasedCompensationArrangementbySharebasedPaymentAwardVestingConditionsPeriod_bc9daa4f-ac10-4c83-bde6-e70bcf45ec16" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedPercent_2ae9bc19-beb2-4af1-82ed-c7137cf87ae7" xlink:href="aon-20201231.xsd#aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedPercent"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_aadc5535-019a-455b-87fa-599e68c6986a" xlink:to="loc_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedPercent_2ae9bc19-beb2-4af1-82ed-c7137cf87ae7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_1eee0243-d680-4882-be22-49cbfd9c6963" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_aadc5535-019a-455b-87fa-599e68c6986a" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation_1eee0243-d680-4882-be22-49cbfd9c6963" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ShareBasedCompensationPlansScheduleofPerformancebasedplansDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#ShareBasedCompensationPlansScheduleofPerformancebasedplansDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ShareBasedCompensationPlansScheduleofPerformancebasedplansDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_1f3a49a0-4fb7-4ce6-930a-78f8b9b8ffe6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c7feeb7b-cbbb-44f1-98e3-dce0df2d0026" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisclosureOfCompensationRelatedCostsSharebasedPaymentsAbstract_1f3a49a0-4fb7-4ce6-930a-78f8b9b8ffe6" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c7feeb7b-cbbb-44f1-98e3-dce0df2d0026" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_742df8bd-75c7-4235-9c97-859b583f423d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AwardTypeAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c7feeb7b-cbbb-44f1-98e3-dce0df2d0026" xlink:to="loc_us-gaap_AwardTypeAxis_742df8bd-75c7-4235-9c97-859b583f423d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7d2d9db5-3dbb-405d-b47f-24900638873d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AwardTypeAxis_742df8bd-75c7-4235-9c97-859b583f423d" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7d2d9db5-3dbb-405d-b47f-24900638873d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceSharesMember_cacaa916-e71e-46a7-a608-174317921e3b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PerformanceSharesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_7d2d9db5-3dbb-405d-b47f-24900638873d" xlink:to="loc_us-gaap_PerformanceSharesMember_cacaa916-e71e-46a7-a608-174317921e3b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c9d9a291-36ea-4201-a050-7a3d90f423ff" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_c7feeb7b-cbbb-44f1-98e3-dce0df2d0026" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c9d9a291-36ea-4201-a050-7a3d90f423ff" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_81dca758-3ceb-466b-91f8-14232195cd39" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c9d9a291-36ea-4201-a050-7a3d90f423ff" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_81dca758-3ceb-466b-91f8-14232195cd39" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_dd614a60-9b89-4c60-aa5c-527ca24ee29b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c9d9a291-36ea-4201-a050-7a3d90f423ff" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_dd614a60-9b89-4c60-aa5c-527ca24ee29b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuable_b3c374f6-d1fa-4437-b139-d30e163efdd4" xlink:href="aon-20201231.xsd#aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuable"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c9d9a291-36ea-4201-a050-7a3d90f423ff" xlink:to="loc_aon_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuable_b3c374f6-d1fa-4437-b139-d30e163efdd4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_UnamortizedExpenseOnPerformanceBasedPlans_da5be312-5e9b-4698-8853-2b4f45c58f0f" xlink:href="aon-20201231.xsd#aon_UnamortizedExpenseOnPerformanceBasedPlans"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_c9d9a291-36ea-4201-a050-7a3d90f423ff" xlink:to="loc_aon_UnamortizedExpenseOnPerformanceBasedPlans_da5be312-5e9b-4698-8853-2b4f45c58f0f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/DerivativesandHedging" xlink:type="simple" xlink:href="aon-20201231.xsd#DerivativesandHedging"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/DerivativesandHedging" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_7aa2036f-4d2c-48f1-b676-0a1cb23dee55" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_bcf391f4-3922-43c5-af07-3f8160f79f09" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_7aa2036f-4d2c-48f1-b676-0a1cb23dee55" xlink:to="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureTextBlock_bcf391f4-3922-43c5-af07-3f8160f79f09" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/DerivativesandHedgingTables" xlink:type="simple" xlink:href="aon-20201231.xsd#DerivativesandHedgingTables"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/DerivativesandHedgingTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_af3eecc6-49a5-41e2-9b84-a03f8347d64a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfNotionalAmountsOfOutstandingDerivativePositionsTableTextBlock_2552dc1e-8557-4580-97c3-8b0ac7a5e3d3" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfNotionalAmountsOfOutstandingDerivativePositionsTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_af3eecc6-49a5-41e2-9b84-a03f8347d64a" xlink:to="loc_us-gaap_ScheduleOfNotionalAmountsOfOutstandingDerivativePositionsTableTextBlock_2552dc1e-8557-4580-97c3-8b0ac7a5e3d3" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock_5b87f731-81ec-401e-b0fe-42fb5045e3b1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_af3eecc6-49a5-41e2-9b84-a03f8347d64a" xlink:to="loc_us-gaap_ScheduleOfDerivativeInstrumentsGainLossInStatementOfFinancialPerformanceTextBlock_5b87f731-81ec-401e-b0fe-42fb5045e3b1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/DerivativesandHedgingNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#DerivativesandHedgingNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/DerivativesandHedgingNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_33bfe2d9-9691-4329-a8da-7a9893e60f98" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_9f388912-1f06-4020-a178-5113f016b3b9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_33bfe2d9-9691-4329-a8da-7a9893e60f98" xlink:to="loc_us-gaap_DerivativeTable_9f388912-1f06-4020-a178-5113f016b3b9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_14049c19-9e8e-4d89-88fe-84991ea8facf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_9f388912-1f06-4020-a178-5113f016b3b9" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_14049c19-9e8e-4d89-88fe-84991ea8facf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingRelationshipDomain_64112f7b-27f3-454b-a1d2-c47536c8aefe" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingRelationshipDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis_14049c19-9e8e-4d89-88fe-84991ea8facf" xlink:to="loc_us-gaap_HedgingRelationshipDomain_64112f7b-27f3-454b-a1d2-c47536c8aefe" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgingMember_ca39d3b7-f2f4-48dd-b69b-4285d9537830" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashFlowHedgingMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_HedgingRelationshipDomain_64112f7b-27f3-454b-a1d2-c47536c8aefe" xlink:to="loc_us-gaap_CashFlowHedgingMember_ca39d3b7-f2f4-48dd-b69b-4285d9537830" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetInvestmentHedgingMember_fae4f40a-6c89-4539-9317-29e4a3daa1f1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NetInvestmentHedgingMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_HedgingRelationshipDomain_64112f7b-27f3-454b-a1d2-c47536c8aefe" xlink:to="loc_us-gaap_NetInvestmentHedgingMember_fae4f40a-6c89-4539-9317-29e4a3daa1f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_69d96314-fc0a-4a1f-851e-21ae7bd25f44" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_9f388912-1f06-4020-a178-5113f016b3b9" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_69d96314-fc0a-4a1f-851e-21ae7bd25f44" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_c9d16d4d-8011-4d59-9085-49c9069c66ae" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_69d96314-fc0a-4a1f-851e-21ae7bd25f44" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_c9d16d4d-8011-4d59-9085-49c9069c66ae" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_1720813d-437d-45f0-80e1-ebd578ae80f1" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_c9d16d4d-8011-4d59-9085-49c9069c66ae" xlink:to="loc_us-gaap_ForeignExchangeContractMember_1720813d-437d-45f0-80e1-ebd578ae80f1" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_de56aa8f-e366-4f3c-a7aa-84300efce0ff" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_9f388912-1f06-4020-a178-5113f016b3b9" xlink:to="loc_us-gaap_HedgingDesignationAxis_de56aa8f-e366-4f3c-a7aa-84300efce0ff" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_23e5dd23-39ac-45ab-8f47-c5cbd5ac6bb6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_HedgingDesignationAxis_de56aa8f-e366-4f3c-a7aa-84300efce0ff" xlink:to="loc_us-gaap_HedgingDesignationDomain_23e5dd23-39ac-45ab-8f47-c5cbd5ac6bb6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_89673d9e-7342-4c08-bfe7-2852f1f86bce" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NondesignatedMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_HedgingDesignationDomain_23e5dd23-39ac-45ab-8f47-c5cbd5ac6bb6" xlink:to="loc_us-gaap_NondesignatedMember_89673d9e-7342-4c08-bfe7-2852f1f86bce" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_5d93d038-f3f4-485b-956c-89c556c74721" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_9f388912-1f06-4020-a178-5113f016b3b9" xlink:to="loc_srt_RangeAxis_5d93d038-f3f4-485b-956c-89c556c74721" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_f14fb852-99e6-45d5-89e1-47d04b3cb3e8" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_5d93d038-f3f4-485b-956c-89c556c74721" xlink:to="loc_srt_RangeMember_f14fb852-99e6-45d5-89e1-47d04b3cb3e8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_d4d89f57-1924-48cb-9fba-aa14cd28af6d" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_f14fb852-99e6-45d5-89e1-47d04b3cb3e8" xlink:to="loc_srt_MaximumMember_d4d89f57-1924-48cb-9fba-aa14cd28af6d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_d1e12e83-11d5-4bea-81e0-754a777b3eca" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLineItems"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_9f388912-1f06-4020-a178-5113f016b3b9" xlink:to="loc_us-gaap_DerivativeLineItems_d1e12e83-11d5-4bea-81e0-754a777b3eca" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_MaximumAverageMaturityOfForeignCurrencyDerivatives_2a743f3f-0999-4c77-96e1-5593afe31122" xlink:href="aon-20201231.xsd#aon_MaximumAverageMaturityOfForeignCurrencyDerivatives"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_d1e12e83-11d5-4bea-81e0-754a777b3eca" xlink:to="loc_aon_MaximumAverageMaturityOfForeignCurrencyDerivatives_2a743f3f-0999-4c77-96e1-5593afe31122" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTermOfContract_6a2449d5-763e-4ddb-9b43-e34010bd576d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeTermOfContract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_d1e12e83-11d5-4bea-81e0-754a777b3eca" xlink:to="loc_us-gaap_DerivativeTermOfContract_6a2449d5-763e-4ddb-9b43-e34010bd576d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_aaf0473a-7d9b-4f8e-b2b5-ea8f9938b1dc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_d1e12e83-11d5-4bea-81e0-754a777b3eca" xlink:to="loc_us-gaap_CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths_aaf0473a-7d9b-4f8e-b2b5-ea8f9938b1dc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2009/role/negatedTerseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeGainLossOnDerivativeNet_aaa5df9f-fa9d-4e1b-9bc6-78961de50258" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeGainLossOnDerivativeNet"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_d1e12e83-11d5-4bea-81e0-754a777b3eca" xlink:to="loc_us-gaap_DerivativeGainLossOnDerivativeNet_aaa5df9f-fa9d-4e1b-9bc6-78961de50258" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotionalAmountOfNonderivativeInstruments_4db8d0e9-d862-40b2-89e1-e2801b8ba9ab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NotionalAmountOfNonderivativeInstruments"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_d1e12e83-11d5-4bea-81e0-754a777b3eca" xlink:to="loc_us-gaap_NotionalAmountOfNonderivativeInstruments_4db8d0e9-d862-40b2-89e1-e2801b8ba9ab" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax_e735c07f-eb4f-4dba-924f-7462775c2230" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_d1e12e83-11d5-4bea-81e0-754a777b3eca" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossBeforeReclassificationAndTax_e735c07f-eb4f-4dba-924f-7462775c2230" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/DerivativesandHedgingNotionalandfairvaluesofderivativeinstrumentsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#DerivativesandHedgingNotionalandfairvaluesofderivativeinstrumentsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/DerivativesandHedgingNotionalandfairvaluesofderivativeinstrumentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_419b12ee-431f-497f-838e-388a85b75111" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_c71c074d-9fe7-42ba-a324-24330099b3e0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_419b12ee-431f-497f-838e-388a85b75111" xlink:to="loc_us-gaap_DerivativeTable_c71c074d-9fe7-42ba-a324-24330099b3e0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationAxis_8f38ffba-322f-4823-8394-c1bae6a35ca5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_c71c074d-9fe7-42ba-a324-24330099b3e0" xlink:to="loc_us-gaap_HedgingDesignationAxis_8f38ffba-322f-4823-8394-c1bae6a35ca5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_HedgingDesignationDomain_c8216e99-41f5-4098-92ec-60a17b621963" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_HedgingDesignationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_HedgingDesignationAxis_8f38ffba-322f-4823-8394-c1bae6a35ca5" xlink:to="loc_us-gaap_HedgingDesignationDomain_c8216e99-41f5-4098-92ec-60a17b621963" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DesignatedAsHedgingInstrumentMember_2a9a8ec8-19b2-4b98-b23a-6650142e0df8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DesignatedAsHedgingInstrumentMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_HedgingDesignationDomain_c8216e99-41f5-4098-92ec-60a17b621963" xlink:to="loc_us-gaap_DesignatedAsHedgingInstrumentMember_2a9a8ec8-19b2-4b98-b23a-6650142e0df8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NondesignatedMember_98acd96e-faf3-45fe-9e8b-fe7b83ae3862" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NondesignatedMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_HedgingDesignationDomain_c8216e99-41f5-4098-92ec-60a17b621963" xlink:to="loc_us-gaap_NondesignatedMember_98acd96e-faf3-45fe-9e8b-fe7b83ae3862" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_01b931b8-fb00-472a-a126-4435aaf327aa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_c71c074d-9fe7-42ba-a324-24330099b3e0" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_01b931b8-fb00-472a-a126-4435aaf327aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_08d2a165-3338-404b-9985-fedbb4fa457d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_01b931b8-fb00-472a-a126-4435aaf327aa" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_08d2a165-3338-404b-9985-fedbb4fa457d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_a7ac520a-1f78-47a9-adba-2e5846e84578" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_08d2a165-3338-404b-9985-fedbb4fa457d" xlink:to="loc_us-gaap_ForeignExchangeContractMember_a7ac520a-1f78-47a9-adba-2e5846e84578" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationAxis_98795c28-07ed-4f64-a12f-92a1b06b8257" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_c71c074d-9fe7-42ba-a324-24330099b3e0" xlink:to="loc_us-gaap_BalanceSheetLocationAxis_98795c28-07ed-4f64-a12f-92a1b06b8257" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_50de377d-1654-4d47-8a08-d2edf93da5e9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationAxis_98795c28-07ed-4f64-a12f-92a1b06b8257" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_50de377d-1654-4d47-8a08-d2edf93da5e9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentAssetsMember_f22a9ce0-aae7-40e4-b893-05b4b97f539f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherCurrentAssetsMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_50de377d-1654-4d47-8a08-d2edf93da5e9" xlink:to="loc_us-gaap_OtherCurrentAssetsMember_f22a9ce0-aae7-40e4-b893-05b4b97f539f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherNoncurrentAssetsMember_0e9d29db-b600-4bf3-bebb-1c9b59b2b38a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherNoncurrentAssetsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_50de377d-1654-4d47-8a08-d2edf93da5e9" xlink:to="loc_us-gaap_OtherNoncurrentAssetsMember_0e9d29db-b600-4bf3-bebb-1c9b59b2b38a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCurrentLiabilitiesMember_9e48f319-a582-434e-9d79-4bc2700a85aa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherCurrentLiabilitiesMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_50de377d-1654-4d47-8a08-d2edf93da5e9" xlink:to="loc_us-gaap_OtherCurrentLiabilitiesMember_9e48f319-a582-434e-9d79-4bc2700a85aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_5d7d7e22-cf9e-4114-86cf-0cd3bea1714e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_c71c074d-9fe7-42ba-a324-24330099b3e0" xlink:to="loc_us-gaap_DerivativeLineItems_5d7d7e22-cf9e-4114-86cf-0cd3bea1714e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_708ff036-4020-44e5-ab01-b4fce56e1caf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_5d7d7e22-cf9e-4114-86cf-0cd3bea1714e" xlink:to="loc_us-gaap_DerivativeNotionalAmount_708ff036-4020-44e5-ab01-b4fce56e1caf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_0d736da7-7526-43c5-9ccf-9238bb7ff190" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeAsset"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_5d7d7e22-cf9e-4114-86cf-0cd3bea1714e" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeAsset_0d736da7-7526-43c5-9ccf-9238bb7ff190" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_b16393fb-51c2-45b1-99cb-79add3123860" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeFairValueOfDerivativeLiability"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_5d7d7e22-cf9e-4114-86cf-0cd3bea1714e" xlink:to="loc_us-gaap_DerivativeFairValueOfDerivativeLiability_b16393fb-51c2-45b1-99cb-79add3123860" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTermOfContract_222e55c2-43b8-4851-8eac-41110b3cb440" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeTermOfContract"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_5d7d7e22-cf9e-4114-86cf-0cd3bea1714e" xlink:to="loc_us-gaap_DerivativeTermOfContract_222e55c2-43b8-4851-8eac-41110b3cb440" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/DerivativesandHedgingScheduleofamountsofderivativegainslossesrecognizedintheConsolidatedFinancialStatementsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#DerivativesandHedgingScheduleofamountsofderivativegainslossesrecognizedintheConsolidatedFinancialStatementsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/DerivativesandHedgingScheduleofamountsofderivativegainslossesrecognizedintheConsolidatedFinancialStatementsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_e8ce280b-298e-43f5-9e2c-1285c7b5b4c2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTable_22b14547-9e20-49f0-b0f4-ccb286d3f128" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentsAndHedgingActivitiesDisclosureAbstract_e8ce280b-298e-43f5-9e2c-1285c7b5b4c2" xlink:to="loc_us-gaap_DerivativeTable_22b14547-9e20-49f0-b0f4-ccb286d3f128" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_4b48a4ae-5660-48b5-aa8f-a1c1975388b2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_22b14547-9e20-49f0-b0f4-ccb286d3f128" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_4b48a4ae-5660-48b5-aa8f-a1c1975388b2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_c4a82d59-1535-4dc1-b4b6-bffc03d9e184" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_4b48a4ae-5660-48b5-aa8f-a1c1975388b2" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_c4a82d59-1535-4dc1-b4b6-bffc03d9e184" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SalesMember_a98e3ce3-8dab-4d9f-8465-3a268c2dfe46" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SalesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c4a82d59-1535-4dc1-b4b6-bffc03d9e184" xlink:to="loc_us-gaap_SalesMember_a98e3ce3-8dab-4d9f-8465-3a268c2dfe46" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_CompensationandBenefitsMember_17699eb3-5fd6-4bb9-9506-72f2fee6b21f" xlink:href="aon-20201231.xsd#aon_CompensationandBenefitsMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c4a82d59-1535-4dc1-b4b6-bffc03d9e184" xlink:to="loc_aon_CompensationandBenefitsMember_17699eb3-5fd6-4bb9-9506-72f2fee6b21f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_OtherGeneralExpensesMember_5b8f50f1-8d9a-45ac-b745-886f9c682198" xlink:href="aon-20201231.xsd#aon_OtherGeneralExpensesMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c4a82d59-1535-4dc1-b4b6-bffc03d9e184" xlink:to="loc_aon_OtherGeneralExpensesMember_5b8f50f1-8d9a-45ac-b745-886f9c682198" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestExpenseMember_0d0d0b37-f149-4eaa-926b-0de45f98bf35" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_InterestExpenseMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c4a82d59-1535-4dc1-b4b6-bffc03d9e184" xlink:to="loc_us-gaap_InterestExpenseMember_0d0d0b37-f149-4eaa-926b-0de45f98bf35" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherIncomeMember_6ccf5827-f120-4540-9561-fd351cf4c4f2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherIncomeMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_c4a82d59-1535-4dc1-b4b6-bffc03d9e184" xlink:to="loc_us-gaap_OtherIncomeMember_6ccf5827-f120-4540-9561-fd351cf4c4f2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLineItems_87348903-40dc-4714-b875-58a25fbc6c08" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeTable_22b14547-9e20-49f0-b0f4-ccb286d3f128" xlink:to="loc_us-gaap_DerivativeLineItems_87348903-40dc-4714-b875-58a25fbc6c08" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_b2732d5e-d1e6-48a9-a8c5-128340e4cc57" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_87348903-40dc-4714-b875-58a25fbc6c08" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAndTax_b2732d5e-d1e6-48a9-a8c5-128340e4cc57" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax_6a69811d-e9ab-47c3-b83b-e5b756518f21" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_87348903-40dc-4714-b875-58a25fbc6c08" xlink:to="loc_us-gaap_OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax_6a69811d-e9ab-47c3-b83b-e5b756518f21" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_9b16722d-cd78-41c7-abf5-c009443dd3e7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_87348903-40dc-4714-b875-58a25fbc6c08" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax_9b16722d-cd78-41c7-abf5-c009443dd3e7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet_c59e8464-cb2e-464f-ad93-406b5da44893" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeLineItems_87348903-40dc-4714-b875-58a25fbc6c08" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet_c59e8464-cb2e-464f-ad93-406b5da44893" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/FairValueMeasurementsandFinancialInstruments" xlink:type="simple" xlink:href="aon-20201231.xsd#FairValueMeasurementsandFinancialInstruments"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/FairValueMeasurementsandFinancialInstruments" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_6778cde4-8d5f-4f96-b7c6-937c8b0e6dab" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresTextBlock_27e5b67d-350e-46d8-92e5-d97ba1fb7dd0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosuresTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_6778cde4-8d5f-4f96-b7c6-937c8b0e6dab" xlink:to="loc_us-gaap_FairValueDisclosuresTextBlock_27e5b67d-350e-46d8-92e5-d97ba1fb7dd0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/FairValueMeasurementsandFinancialInstrumentsTables" xlink:type="simple" xlink:href="aon-20201231.xsd#FairValueMeasurementsandFinancialInstrumentsTables"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/FairValueMeasurementsandFinancialInstrumentsTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_a315c353-f6b0-4dbc-a9ca-6301c5439caf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_91fc0565-9b32-4770-9736-0c1c6b711a11" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_a315c353-f6b0-4dbc-a9ca-6301c5439caf" xlink:to="loc_us-gaap_ScheduleOfFairValueAssetsAndLiabilitiesMeasuredOnRecurringBasisTableTextBlock_91fc0565-9b32-4770-9736-0c1c6b711a11" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByBalanceSheetGroupingTextBlock_a5257273-e25c-499b-b9d9-d4853ede3f3d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByBalanceSheetGroupingTextBlock"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_a315c353-f6b0-4dbc-a9ca-6301c5439caf" xlink:to="loc_us-gaap_FairValueByBalanceSheetGroupingTextBlock_a5257273-e25c-499b-b9d9-d4853ede3f3d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/FairValueMeasurementsandFinancialInstrumentsScheduleofassetsandliabilitiesthataremeasuredatfairvalueonarecurringbasisDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#FairValueMeasurementsandFinancialInstrumentsScheduleofassetsandliabilitiesthataremeasuredatfairvalueonarecurringbasisDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/FairValueMeasurementsandFinancialInstrumentsScheduleofassetsandliabilitiesthataremeasuredatfairvalueonarecurringbasisDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_baaa3b7e-cbd0-4168-97ac-33ff539080a2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_84954fb3-e09a-4d9d-b02d-52f553f1cb5a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_baaa3b7e-cbd0-4168-97ac-33ff539080a2" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_84954fb3-e09a-4d9d-b02d-52f553f1cb5a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_c09f7d71-f284-4ca8-b297-c17ccda65341" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_84954fb3-e09a-4d9d-b02d-52f553f1cb5a" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_c09f7d71-f284-4ca8-b297-c17ccda65341" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_aebc9853-e4f0-427c-a0d6-44c73bd52571" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_c09f7d71-f284-4ca8-b297-c17ccda65341" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_aebc9853-e4f0-427c-a0d6-44c73bd52571" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_c5c1c8f6-d3e0-4756-8335-4cbc4404d5aa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_aebc9853-e4f0-427c-a0d6-44c73bd52571" xlink:to="loc_us-gaap_ForeignExchangeContractMember_c5c1c8f6-d3e0-4756-8335-4cbc4404d5aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_5414bcdf-0c9f-44f5-8020-e598a20fad2e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_84954fb3-e09a-4d9d-b02d-52f553f1cb5a" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_5414bcdf-0c9f-44f5-8020-e598a20fad2e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_24255431-f443-4453-9b89-3e6f2b21a92c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_5414bcdf-0c9f-44f5-8020-e598a20fad2e" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_24255431-f443-4453-9b89-3e6f2b21a92c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_3ba1eb74-8f27-439a-8365-42b222a48631" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_24255431-f443-4453-9b89-3e6f2b21a92c" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_3ba1eb74-8f27-439a-8365-42b222a48631" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_fc615d64-630c-46f8-aad6-034947aa171b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_24255431-f443-4453-9b89-3e6f2b21a92c" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_fc615d64-630c-46f8-aad6-034947aa171b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_3a2dd65a-78f4-40d4-b512-7b240bc89c4a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_24255431-f443-4453-9b89-3e6f2b21a92c" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_3a2dd65a-78f4-40d4-b512-7b240bc89c4a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentAxis_894bca78-b5ed-4b68-ad6f-aa8332706efa" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_84954fb3-e09a-4d9d-b02d-52f553f1cb5a" xlink:to="loc_us-gaap_FinancialInstrumentAxis_894bca78-b5ed-4b68-ad6f-aa8332706efa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_d0df92db-0605-4308-a516-d667f98c4737" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentAxis_894bca78-b5ed-4b68-ad6f-aa8332706efa" xlink:to="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_d0df92db-0605-4308-a516-d667f98c4737" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_MoneyMarketFundsAndOtherHighlyLiquidDebtSecuritiesMember_a2684a33-6e85-4556-b9e9-a40c59c35f12" xlink:href="aon-20201231.xsd#aon_MoneyMarketFundsAndOtherHighlyLiquidDebtSecuritiesMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_d0df92db-0605-4308-a516-d667f98c4737" xlink:to="loc_aon_MoneyMarketFundsAndOtherHighlyLiquidDebtSecuritiesMember_a2684a33-6e85-4556-b9e9-a40c59c35f12" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_GovernmentBondSecuritiesMember_9326b069-b8ac-4072-baf5-15463f5d40aa" xlink:href="aon-20201231.xsd#aon_GovernmentBondSecuritiesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_d0df92db-0605-4308-a516-d667f98c4737" xlink:to="loc_aon_GovernmentBondSecuritiesMember_9326b069-b8ac-4072-baf5-15463f5d40aa" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesMember_b6bbc44c-e96f-4b86-a194-75f203f62dde" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquitySecuritiesMember"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_d0df92db-0605-4308-a516-d667f98c4737" xlink:to="loc_us-gaap_EquitySecuritiesMember_b6bbc44c-e96f-4b86-a194-75f203f62dde" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_23693f92-00cc-45c1-83b8-b6f982bd7e42" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_TransfersAndServicingOfFinancialInstrumentsTypesOfFinancialInstrumentsDomain_d0df92db-0605-4308-a516-d667f98c4737" xlink:to="loc_us-gaap_ForeignExchangeContractMember_23693f92-00cc-45c1-83b8-b6f982bd7e42" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_c1eb2a71-6616-4cf2-af72-2b7b75812cbd" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_84954fb3-e09a-4d9d-b02d-52f553f1cb5a" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_c1eb2a71-6616-4cf2-af72-2b7b75812cbd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_84ca5637-004f-455f-800f-e8e1cd8f8afc" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_c1eb2a71-6616-4cf2-af72-2b7b75812cbd" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_84ca5637-004f-455f-800f-e8e1cd8f8afc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_eb6b7910-4483-48e8-9490-4b2d99b32e7d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_84ca5637-004f-455f-800f-e8e1cd8f8afc" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_eb6b7910-4483-48e8-9490-4b2d99b32e7d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_9b38eced-6631-4b34-8b6f-2fe204466d88" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_84954fb3-e09a-4d9d-b02d-52f553f1cb5a" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_9b38eced-6631-4b34-8b6f-2fe204466d88" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosureAbstract_6f0ecd7b-b1d6-4cba-8955-ad35488ea6e2" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_AssetsFairValueDisclosureAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_9b38eced-6631-4b34-8b6f-2fe204466d88" xlink:to="loc_us-gaap_AssetsFairValueDisclosureAbstract_6f0ecd7b-b1d6-4cba-8955-ad35488ea6e2" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure_6455606c-28f3-45a4-93cf-5e7783d4d0dd" xlink:href="aon-20201231.xsd#aon_BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_6f0ecd7b-b1d6-4cba-8955-ad35488ea6e2" xlink:to="loc_aon_BasisMoneyMarketFundsAndHighlyLiquidSecuritiesFairValueDisclosure_6455606c-28f3-45a4-93cf-5e7783d4d0dd" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherInvestments_51f7dc1f-0d8d-4d53-b186-fadb39a89a07" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherInvestments"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_6f0ecd7b-b1d6-4cba-8955-ad35488ea6e2" xlink:to="loc_us-gaap_OtherInvestments_51f7dc1f-0d8d-4d53-b186-fadb39a89a07" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_156f72d7-e41b-4b0a-8748-a4b63ccfd154" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeAssets"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_AssetsFairValueDisclosureAbstract_6f0ecd7b-b1d6-4cba-8955-ad35488ea6e2" xlink:to="loc_us-gaap_DerivativeAssets_156f72d7-e41b-4b0a-8748-a4b63ccfd154" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_9a05b13f-c6ae-4085-a97b-6fb699201ef0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LiabilitiesFairValueDisclosureAbstract"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_9b38eced-6631-4b34-8b6f-2fe204466d88" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_9a05b13f-c6ae-4085-a97b-6fb699201ef0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_be8253a2-5e57-44f7-9ef0-aad4f7813f13" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DerivativeLiabilities"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LiabilitiesFairValueDisclosureAbstract_9a05b13f-c6ae-4085-a97b-6fb699201ef0" xlink:to="loc_us-gaap_DerivativeLiabilities_be8253a2-5e57-44f7-9ef0-aad4f7813f13" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/FairValueMeasurementsandFinancialInstrumentsNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#FairValueMeasurementsandFinancialInstrumentsNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/FairValueMeasurementsandFinancialInstrumentsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_0a99eaaf-4678-4589-9bd6-45396c077722" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_161af69e-7691-49c6-af8c-f1714126860a" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_0a99eaaf-4678-4589-9bd6-45396c077722" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentBeforeTax_161af69e-7691-49c6-af8c-f1714126860a" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/FairValueMeasurementsandFinancialInstrumentsScheduleoffinancialinstrumentswherethecarryingamountsandfairvaluesdifferDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#FairValueMeasurementsandFinancialInstrumentsScheduleoffinancialinstrumentswherethecarryingamountsandfairvaluesdifferDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/FairValueMeasurementsandFinancialInstrumentsScheduleoffinancialinstrumentswherethecarryingamountsandfairvaluesdifferDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosuresAbstract_b3c24629-7f02-421f-b61c-bca2d209f6ce" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FairValueDisclosuresAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract_8118731c-5521-4293-93a6-cae15e6b7052" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FairValueDisclosuresAbstract_b3c24629-7f02-421f-b61c-bca2d209f6ce" xlink:to="loc_us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract_8118731c-5521-4293-93a6-cae15e6b7052" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredDebtCurrent_c2d220e7-8be4-4bf5-ac94-0ac87c69d279" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SecuredDebtCurrent"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract_8118731c-5521-4293-93a6-cae15e6b7052" xlink:to="loc_us-gaap_SecuredDebtCurrent_c2d220e7-8be4-4bf5-ac94-0ac87c69d279" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShorttermDebtFairValue_68db9bd0-e0aa-4ec4-827c-ad4e4c2e1902" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ShorttermDebtFairValue"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract_8118731c-5521-4293-93a6-cae15e6b7052" xlink:to="loc_us-gaap_ShorttermDebtFairValue_68db9bd0-e0aa-4ec4-827c-ad4e4c2e1902" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_33099351-8241-44de-91a6-4f0af54b98e4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract_8118731c-5521-4293-93a6-cae15e6b7052" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_33099351-8241-44de-91a6-4f0af54b98e4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_113b8629-4bb5-4b57-a540-d04dca04f127" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_FinancialInstrumentsOwnedAtFairValueAbstract_8118731c-5521-4293-93a6-cae15e6b7052" xlink:to="loc_us-gaap_LongTermDebtFairValue_113b8629-4bb5-4b57-a540-d04dca04f127" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ClaimsLawsuitsandOtherContingencies" xlink:type="simple" xlink:href="aon-20201231.xsd#ClaimsLawsuitsandOtherContingencies"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ClaimsLawsuitsandOtherContingencies" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_cbccdf01-90c8-4579-8133-d15a6a05254c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_014b7fde-1ab7-4a72-a43c-b9edb39666c6" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_cbccdf01-90c8-4579-8133-d15a6a05254c" xlink:to="loc_us-gaap_CommitmentsAndContingenciesDisclosureTextBlock_014b7fde-1ab7-4a72-a43c-b9edb39666c6" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ClaimsLawsuitsandOtherContingenciesLegalNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#ClaimsLawsuitsandOtherContingenciesLegalNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ClaimsLawsuitsandOtherContingenciesLegalNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_7cad368f-a718-4a8a-80fe-a35975d39be5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_2fec7c80-79db-4f93-8b38-48b06356e2e8" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LossContingenciesTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_7cad368f-a718-4a8a-80fe-a35975d39be5" xlink:to="loc_us-gaap_LossContingenciesTable_2fec7c80-79db-4f93-8b38-48b06356e2e8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesByIndustryAxis_558925d5-9043-46c7-96d1-29138df3e11e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquitySecuritiesByIndustryAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_2fec7c80-79db-4f93-8b38-48b06356e2e8" xlink:to="loc_us-gaap_EquitySecuritiesByIndustryAxis_558925d5-9043-46c7-96d1-29138df3e11e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquitySecuritiesIndustryMember_7bd4327b-9972-4fde-8bfd-52946be24c6c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EquitySecuritiesIndustryMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesByIndustryAxis_558925d5-9043-46c7-96d1-29138df3e11e" xlink:to="loc_us-gaap_EquitySecuritiesIndustryMember_7bd4327b-9972-4fde-8bfd-52946be24c6c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_AviationandAerospaceBrokingIndustryMember_6cf77ce3-a156-4a7b-8e61-ffa457e2d5fc" xlink:href="aon-20201231.xsd#aon_AviationandAerospaceBrokingIndustryMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_EquitySecuritiesIndustryMember_7bd4327b-9972-4fde-8bfd-52946be24c6c" xlink:to="loc_aon_AviationandAerospaceBrokingIndustryMember_6cf77ce3-a156-4a7b-8e61-ffa457e2d5fc" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_5222f669-de32-43ba-bcb2-4d732dc7ca7b" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_2fec7c80-79db-4f93-8b38-48b06356e2e8" xlink:to="loc_srt_RangeAxis_5222f669-de32-43ba-bcb2-4d732dc7ca7b" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_b8aff9be-7bbf-497c-b340-34c01a0f6e4c" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_RangeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeAxis_5222f669-de32-43ba-bcb2-4d732dc7ca7b" xlink:to="loc_srt_RangeMember_b8aff9be-7bbf-497c-b340-34c01a0f6e4c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_c4f88945-42f7-43ca-bc03-8f547e7d12bf" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MinimumMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_b8aff9be-7bbf-497c-b340-34c01a0f6e4c" xlink:to="loc_srt_MinimumMember_c4f88945-42f7-43ca-bc03-8f547e7d12bf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_33977b6f-02e6-4875-b9dd-a72f4fcefd17" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_MaximumMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_RangeMember_b8aff9be-7bbf-497c-b340-34c01a0f6e4c" xlink:to="loc_srt_MaximumMember_33977b6f-02e6-4875-b9dd-a72f4fcefd17" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusAxis_591e249e-b5d5-4ec7-87f4-d5d895b87b3d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LitigationStatusAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_2fec7c80-79db-4f93-8b38-48b06356e2e8" xlink:to="loc_us-gaap_LitigationStatusAxis_591e249e-b5d5-4ec7-87f4-d5d895b87b3d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LitigationStatusDomain_b13da140-eff9-4e88-b851-77f61966578d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LitigationStatusDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LitigationStatusAxis_591e249e-b5d5-4ec7-87f4-d5d895b87b3d" xlink:to="loc_us-gaap_LitigationStatusDomain_b13da140-eff9-4e88-b851-77f61966578d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PendingLitigationMember_855c4b04-dafa-436c-9e69-9b3ec7ce19a0" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PendingLitigationMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LitigationStatusDomain_b13da140-eff9-4e88-b851-77f61966578d" xlink:to="loc_us-gaap_PendingLitigationMember_855c4b04-dafa-436c-9e69-9b3ec7ce19a0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseAxis_3d8f8508-c25f-48ca-bf3c-0b65828b8e82" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_LitigationCaseAxis"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_2fec7c80-79db-4f93-8b38-48b06356e2e8" xlink:to="loc_srt_LitigationCaseAxis_3d8f8508-c25f-48ca-bf3c-0b65828b8e82" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_LitigationCaseTypeDomain_618690b2-9bb9-48da-9b3e-06d89deb97df" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_LitigationCaseTypeDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_LitigationCaseAxis_3d8f8508-c25f-48ca-bf3c-0b65828b8e82" xlink:to="loc_srt_LitigationCaseTypeDomain_618690b2-9bb9-48da-9b3e-06d89deb97df" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_ChristchurchCityCouncilMember_f7019146-8f64-49d9-b26c-3b88e5cd3fc5" xlink:href="aon-20201231.xsd#aon_ChristchurchCityCouncilMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_LitigationCaseTypeDomain_618690b2-9bb9-48da-9b3e-06d89deb97df" xlink:to="loc_aon_ChristchurchCityCouncilMember_f7019146-8f64-49d9-b26c-3b88e5cd3fc5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_AonHewittInvestmentConsultingIncMember_4e7bc22e-1989-46f7-8cb8-176e47dba542" xlink:href="aon-20201231.xsd#aon_AonHewittInvestmentConsultingIncMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_LitigationCaseTypeDomain_618690b2-9bb9-48da-9b3e-06d89deb97df" xlink:to="loc_aon_AonHewittInvestmentConsultingIncMember_4e7bc22e-1989-46f7-8cb8-176e47dba542" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_PilkingtonNorthAmericaInc.Member_0dfb6852-0f59-446d-9270-93af5c1ddecf" xlink:href="aon-20201231.xsd#aon_PilkingtonNorthAmericaInc.Member"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_LitigationCaseTypeDomain_618690b2-9bb9-48da-9b3e-06d89deb97df" xlink:to="loc_aon_PilkingtonNorthAmericaInc.Member_0dfb6852-0f59-446d-9270-93af5c1ddecf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_FatalPlainCrashInNovember2016Member_de3f51aa-fa49-4873-bb99-f86452d20036" xlink:href="aon-20201231.xsd#aon_FatalPlainCrashInNovember2016Member"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_LitigationCaseTypeDomain_618690b2-9bb9-48da-9b3e-06d89deb97df" xlink:to="loc_aon_FatalPlainCrashInNovember2016Member_de3f51aa-fa49-4873-bb99-f86452d20036" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_NEBCMember_6b8bb05d-f3cc-4ab0-ac1c-16fc4e7a0bcf" xlink:href="aon-20201231.xsd#aon_NEBCMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_LitigationCaseTypeDomain_618690b2-9bb9-48da-9b3e-06d89deb97df" xlink:to="loc_aon_NEBCMember_6b8bb05d-f3cc-4ab0-ac1c-16fc4e7a0bcf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_f46e9880-edf7-458d-b4b5-bd346e485dd5" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_2fec7c80-79db-4f93-8b38-48b06356e2e8" xlink:to="loc_us-gaap_LossContingenciesLineItems_f46e9880-edf7-458d-b4b5-bd346e485dd5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_cd396d97-496b-41d3-989b-e764e367d876" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LossContingencyEstimateOfPossibleLoss"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_f46e9880-edf7-458d-b4b5-bd346e485dd5" xlink:to="loc_us-gaap_LossContingencyEstimateOfPossibleLoss_cd396d97-496b-41d3-989b-e764e367d876" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyDamagesSoughtValue_24791fc0-05ec-411a-8071-cd76a8ae0be4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LossContingencyDamagesSoughtValue"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_f46e9880-edf7-458d-b4b5-bd346e485dd5" xlink:to="loc_us-gaap_LossContingencyDamagesSoughtValue_24791fc0-05ec-411a-8071-cd76a8ae0be4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_LossContingencyInvestmentLossesSufferedByPlaintiff_a7cc9870-92d6-465f-83e6-2e70c39f97c5" xlink:href="aon-20201231.xsd#aon_LossContingencyInvestmentLossesSufferedByPlaintiff"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_f46e9880-edf7-458d-b4b5-bd346e485dd5" xlink:to="loc_aon_LossContingencyInvestmentLossesSufferedByPlaintiff_a7cc9870-92d6-465f-83e6-2e70c39f97c5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyDamagesAwardedValue_af1611ae-6815-4c81-839a-0551e2582411" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LossContingencyDamagesAwardedValue"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_f46e9880-edf7-458d-b4b5-bd346e485dd5" xlink:to="loc_us-gaap_LossContingencyDamagesAwardedValue_af1611ae-6815-4c81-839a-0551e2582411" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNumberOfDefendants_8ea4ecab-07cb-414b-bb96-5ef69519f56d" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LossContingencyNumberOfDefendants"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_f46e9880-edf7-458d-b4b5-bd346e485dd5" xlink:to="loc_us-gaap_LossContingencyNumberOfDefendants_8ea4ecab-07cb-414b-bb96-5ef69519f56d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_LossContingencyDamagesSoughtValueOptionOne_1e699b60-e30f-4289-ac34-6582a003922d" xlink:href="aon-20201231.xsd#aon_LossContingencyDamagesSoughtValueOptionOne"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_f46e9880-edf7-458d-b4b5-bd346e485dd5" xlink:to="loc_aon_LossContingencyDamagesSoughtValueOptionOne_1e699b60-e30f-4289-ac34-6582a003922d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_LossContingencyDamagesSoughtValueOptionTwo_55a58146-8591-4697-9080-0259bc49fa93" xlink:href="aon-20201231.xsd#aon_LossContingencyDamagesSoughtValueOptionTwo"/>
    <link:presentationArc order="7" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_f46e9880-edf7-458d-b4b5-bd346e485dd5" xlink:to="loc_aon_LossContingencyDamagesSoughtValueOptionTwo_55a58146-8591-4697-9080-0259bc49fa93" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_LossContingencyDamagesSoughtValueOptionThree_21423416-4d7a-40dc-bec1-826a344b5253" xlink:href="aon-20201231.xsd#aon_LossContingencyDamagesSoughtValueOptionThree"/>
    <link:presentationArc order="8" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_f46e9880-edf7-458d-b4b5-bd346e485dd5" xlink:to="loc_aon_LossContingencyDamagesSoughtValueOptionThree_21423416-4d7a-40dc-bec1-826a344b5253" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingencyNumberOfPlaintiffs_2f3018e7-04f7-4d7a-809b-a5551722214f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LossContingencyNumberOfPlaintiffs"/>
    <link:presentationArc order="9" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_f46e9880-edf7-458d-b4b5-bd346e485dd5" xlink:to="loc_us-gaap_LossContingencyNumberOfPlaintiffs_2f3018e7-04f7-4d7a-809b-a5551722214f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Revenues_20e8c7a3-a331-451e-abae-8c91a7b63a0e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_Revenues"/>
    <link:presentationArc order="10" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_f46e9880-edf7-458d-b4b5-bd346e485dd5" xlink:to="loc_us-gaap_Revenues_20e8c7a3-a331-451e-abae-8c91a7b63a0e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ClaimsLawsuitsandOtherContingenciesGuaranteesandIndemnificationsNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#ClaimsLawsuitsandOtherContingenciesGuaranteesandIndemnificationsNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ClaimsLawsuitsandOtherContingenciesGuaranteesandIndemnificationsNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_8fe33a35-b1ec-448b-b389-7fcd013eb58b" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_e63608e5-3eaf-41f0-a09b-1bbc6f028bf7" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LossContingenciesTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_8fe33a35-b1ec-448b-b389-7fcd013eb58b" xlink:to="loc_us-gaap_LossContingenciesTable_e63608e5-3eaf-41f0-a09b-1bbc6f028bf7" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationAxis_e8f33bc6-2c3e-45ad-ade6-7e22ba85cd1c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupClassificationAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_e63608e5-3eaf-41f0-a09b-1bbc6f028bf7" xlink:to="loc_us-gaap_DisposalGroupClassificationAxis_e8f33bc6-2c3e-45ad-ade6-7e22ba85cd1c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupClassificationDomain_37f03171-8309-47a1-8e01-00bd57b045ef" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupClassificationDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupClassificationAxis_e8f33bc6-2c3e-45ad-ade6-7e22ba85cd1c" xlink:to="loc_us-gaap_DisposalGroupClassificationDomain_37f03171-8309-47a1-8e01-00bd57b045ef" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_37331e8b-5574-44c4-abb7-89489578b693" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DiscontinuedOperationsDisposedOfBySaleMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupClassificationDomain_37f03171-8309-47a1-8e01-00bd57b045ef" xlink:to="loc_us-gaap_DiscontinuedOperationsDisposedOfBySaleMember_37331e8b-5574-44c4-abb7-89489578b693" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_8ee28b1f-7b36-4a61-86d0-c14fca44fdde" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_e63608e5-3eaf-41f0-a09b-1bbc6f028bf7" xlink:to="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_8ee28b1f-7b36-4a61-86d0-c14fca44fdde" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_f40ef143-2878-4db4-8a65-0c0d89e1d585" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_IncomeStatementBalanceSheetAndAdditionalDisclosuresByDisposalGroupsIncludingDiscontinuedOperationsAxis_8ee28b1f-7b36-4a61-86d0-c14fca44fdde" xlink:to="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_f40ef143-2878-4db4-8a65-0c0d89e1d585" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_TempoBusinessMember_cdc643c3-6b78-4692-bf2f-b6d6a3474b83" xlink:href="aon-20201231.xsd#aon_TempoBusinessMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_DisposalGroupsIncludingDiscontinuedOperationsNameDomain_f40ef143-2878-4db4-8a65-0c0d89e1d585" xlink:to="loc_aon_TempoBusinessMember_cdc643c3-6b78-4692-bf2f-b6d6a3474b83" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_eca0cec1-3a67-4b1b-ae8a-66d52cf87220" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GuaranteeObligationsByNatureAxis"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_e63608e5-3eaf-41f0-a09b-1bbc6f028bf7" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_eca0cec1-3a67-4b1b-ae8a-66d52cf87220" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_036e6da1-ad82-4ba3-a353-f3ed17b7d816" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_eca0cec1-3a67-4b1b-ae8a-66d52cf87220" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_036e6da1-ad82-4ba3-a353-f3ed17b7d816" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyLeaseGuaranteeMember_518eb55c-c469-4724-aa16-c8248a3af605" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PropertyLeaseGuaranteeMember"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_036e6da1-ad82-4ba3-a353-f3ed17b7d816" xlink:to="loc_us-gaap_PropertyLeaseGuaranteeMember_518eb55c-c469-4724-aa16-c8248a3af605" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PerformanceGuaranteeMember_44dd7442-397c-4776-8f58-78cfa985a3ec" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_PerformanceGuaranteeMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_036e6da1-ad82-4ba3-a353-f3ed17b7d816" xlink:to="loc_us-gaap_PerformanceGuaranteeMember_44dd7442-397c-4776-8f58-78cfa985a3ec" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_dd8d9ed0-4e24-4296-9c21-884e72079f79" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesTable_e63608e5-3eaf-41f0-a09b-1bbc6f028bf7" xlink:to="loc_us-gaap_LossContingenciesLineItems_dd8d9ed0-4e24-4296-9c21-884e72079f79" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_6d8ee35d-b61d-4db5-a762-1e0cac2a43f9" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_dd8d9ed0-4e24-4296-9c21-884e72079f79" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_6d8ee35d-b61d-4db5-a762-1e0cac2a43f9" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_ce314923-8ccc-4ee7-b65c-567a0f2436cf" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GuaranteeObligationsCurrentCarryingValue"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_LossContingenciesLineItems_dd8d9ed0-4e24-4296-9c21-884e72079f79" xlink:to="loc_us-gaap_GuaranteeObligationsCurrentCarryingValue_ce314923-8ccc-4ee7-b65c-567a0f2436cf" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ClaimsLawsuitsandOtherContingenciesLettersofCreditNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#ClaimsLawsuitsandOtherContingenciesLettersofCreditNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ClaimsLawsuitsandOtherContingenciesLettersofCreditNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_fe9425ee-9328-4667-a0e2-f8a5aa849998" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LettersOfCreditOutstandingAmount_9bada925-68e3-49e2-88d8-b68472191a92" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_LettersOfCreditOutstandingAmount"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_fe9425ee-9328-4667-a0e2-f8a5aa849998" xlink:to="loc_us-gaap_LettersOfCreditOutstandingAmount_9bada925-68e3-49e2-88d8-b68472191a92" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/ClaimsLawsuitsandOtherContingenciesPremiumPaymentsDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#ClaimsLawsuitsandOtherContingenciesPremiumPaymentsDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/ClaimsLawsuitsandOtherContingenciesPremiumPaymentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_2633eb33-fb14-4d75-bc4d-130e6967aa49" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_CommitmentsAndContingenciesDisclosureAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_90255fe5-8859-470c-ab16-5a7bf73d3e7f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_CommitmentsAndContingenciesDisclosureAbstract_2633eb33-fb14-4d75-bc4d-130e6967aa49" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_90255fe5-8859-470c-ab16-5a7bf73d3e7f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/SegmentInformation" xlink:type="simple" xlink:href="aon-20201231.xsd#SegmentInformation"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/SegmentInformation" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingAbstract_ce1fa680-7b83-4970-809a-69782f9b5b14" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentReportingAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingDisclosureTextBlock_cbdfc13b-96f3-4452-9268-121613c3dc41" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentReportingDisclosureTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_ce1fa680-7b83-4970-809a-69782f9b5b14" xlink:to="loc_us-gaap_SegmentReportingDisclosureTextBlock_cbdfc13b-96f3-4452-9268-121613c3dc41" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/SegmentInformationTables" xlink:type="simple" xlink:href="aon-20201231.xsd#SegmentInformationTables"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/SegmentInformationTables" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingAbstract_95daad14-5d93-4285-99e7-47b7ab5ceb07" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentReportingAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTextBlock_b787240c-80c1-406d-ac82-302217d1c3c4" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTextBlock"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_95daad14-5d93-4285-99e7-47b7ab5ceb07" xlink:to="loc_us-gaap_ScheduleOfEntityWideDisclosureOnGeographicAreasLongLivedAssetsInIndividualForeignCountriesByCountryTextBlock_b787240c-80c1-406d-ac82-302217d1c3c4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/SegmentInformationNarrativeDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#SegmentInformationNarrativeDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/SegmentInformationNarrativeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingAbstract_734ca45d-a7ba-4c19-8402-cf86871dc922" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentReportingAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NumberOfReportableSegments_e36149ab-284a-4bcc-99ef-afb5c604351f" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_NumberOfReportableSegments"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_734ca45d-a7ba-4c19-8402-cf86871dc922" xlink:to="loc_us-gaap_NumberOfReportableSegments_e36149ab-284a-4bcc-99ef-afb5c604351f" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_NumberofRevenueLines_c56a841c-e771-4637-8bb1-713222353fa4" xlink:href="aon-20201231.xsd#aon_NumberofRevenueLines"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_734ca45d-a7ba-4c19-8402-cf86871dc922" xlink:to="loc_aon_NumberofRevenueLines_c56a841c-e771-4637-8bb1-713222353fa4" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_NumberOfPerformanceMetricsMeasured_921c06c6-2606-456a-bc7b-aa75a2670f19" xlink:href="aon-20201231.xsd#aon_NumberOfPerformanceMetricsMeasured"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_734ca45d-a7ba-4c19-8402-cf86871dc922" xlink:to="loc_aon_NumberOfPerformanceMetricsMeasured_921c06c6-2606-456a-bc7b-aa75a2670f19" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
  <link:roleRef roleURI="http://www.aon.com/role/SegmentInformationScheduleofconsolidatednoncurrentassetsbygeographicareaDetails" xlink:type="simple" xlink:href="aon-20201231.xsd#SegmentInformationScheduleofconsolidatednoncurrentassetsbygeographicareaDetails"/>
  <link:presentationLink xlink:role="http://www.aon.com/role/SegmentInformationScheduleofconsolidatednoncurrentassetsbygeographicareaDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingAbstract_1c797644-2fe7-4e5c-b247-ecf3de979b26" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_SegmentReportingAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_4f82a443-a921-408f-a378-9a4047b0439c" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_SegmentReportingAbstract_1c797644-2fe7-4e5c-b247-ecf3de979b26" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_4f82a443-a921-408f-a378-9a4047b0439c" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_7521eb70-bbf0-42dd-93de-7a76825eac4d" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_StatementGeographicalAxis"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_4f82a443-a921-408f-a378-9a4047b0439c" xlink:to="loc_srt_StatementGeographicalAxis_7521eb70-bbf0-42dd-93de-7a76825eac4d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_1b45817a-83d1-4910-8cda-68e4d98d7f6d" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_SegmentGeographicalDomain"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_StatementGeographicalAxis_7521eb70-bbf0-42dd-93de-7a76825eac4d" xlink:to="loc_srt_SegmentGeographicalDomain_1b45817a-83d1-4910-8cda-68e4d98d7f6d" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_992df402-e36c-4e93-a484-63ccf1a90fed" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_US"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_1b45817a-83d1-4910-8cda-68e4d98d7f6d" xlink:to="loc_country_US_992df402-e36c-4e93-a484-63ccf1a90fed" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_AmericasOtherthanUnitedStatesMember_c5ccfd4b-0ce3-4455-9227-af3ee6c834b5" xlink:href="aon-20201231.xsd#aon_AmericasOtherthanUnitedStatesMember"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_1b45817a-83d1-4910-8cda-68e4d98d7f6d" xlink:to="loc_aon_AmericasOtherthanUnitedStatesMember_c5ccfd4b-0ce3-4455-9227-af3ee6c834b5" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_GB_60d16828-d47d-4120-8289-624f07761056" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_GB"/>
    <link:presentationArc order="3" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_1b45817a-83d1-4910-8cda-68e4d98d7f6d" xlink:to="loc_country_GB_60d16828-d47d-4120-8289-624f07761056" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/verboseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_IE_7db401c4-e5a1-4077-a416-c8f68e1993f8" xlink:href="https://xbrl.sec.gov/country/2020/country-2020-01-31.xsd#country_IE"/>
    <link:presentationArc order="4" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_1b45817a-83d1-4910-8cda-68e4d98d7f6d" xlink:to="loc_country_IE_7db401c4-e5a1-4077-a416-c8f68e1993f8" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_8a4fef94-ae84-4cdb-b43d-e2cfa3aa0b51" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_EMEAMember"/>
    <link:presentationArc order="5" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_1b45817a-83d1-4910-8cda-68e4d98d7f6d" xlink:to="loc_us-gaap_EMEAMember_8a4fef94-ae84-4cdb-b43d-e2cfa3aa0b51" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaPacificMember_4eabecbd-1476-4096-9d82-ea62acfb0290" xlink:href="http://xbrl.fasb.org/srt/2020/elts/srt-2020-01-31.xsd#srt_AsiaPacificMember"/>
    <link:presentationArc order="6" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_srt_SegmentGeographicalDomain_1b45817a-83d1-4910-8cda-68e4d98d7f6d" xlink:to="loc_srt_AsiaPacificMember_4eabecbd-1476-4096-9d82-ea62acfb0290" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_0242049b-e950-4d6c-84f5-0b705785bc0e" xlink:href="http://xbrl.fasb.org/us-gaap/2020/elts/us-gaap-2020-01-31.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:presentationArc order="2" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_4f82a443-a921-408f-a378-9a4047b0439c" xlink:to="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_0242049b-e950-4d6c-84f5-0b705785bc0e" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
    <link:loc xlink:type="locator" xlink:label="loc_aon_PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization_f4cf75fd-3131-4625-84b9-cc19ebd8fde0" xlink:href="aon-20201231.xsd#aon_PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization"/>
    <link:presentationArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/parent-child" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_0242049b-e950-4d6c-84f5-0b705785bc0e" xlink:to="loc_aon_PropertyPlantAndEquipmentAndOperatingLeaseRightOfUseAssetAfterAccumulatedDepreciationandAmortization_f4cf75fd-3131-4625-84b9-cc19ebd8fde0" xlink:type="arc" preferredLabel="http://www.xbrl.org/2003/role/terseLabel"/>
  </link:presentationLink>
</link:linkbase>
