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    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001870432</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
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    <issuerInfo>
      <issuerCik>0000315293</issuerCik>
      <issuerName>Aon plc</issuerName>
      <secFileNumber>001-07933</secFileNumber>
      <issuerAddress>
        <com:street1>METROPOLITAN BUILDING</com:street1>
        <com:street2>JAMES JOYCE STREET</com:street2>
        <com:city>DUBLIN 1</com:city>
        <com:stateOrCountry>L2</com:stateOrCountry>
        <com:zipCode>D01 K0Y8</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>35312666000</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Platt James</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Class A</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Fidelity Brokerage Services LLC</name>
        <address>
          <com:street1>900 Salem Street</com:street1>
          <com:city>Smithfield</com:city>
          <com:stateOrCountry>RI</com:stateOrCountry>
          <com:zipCode>02917</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>3850</noOfUnitsSold>
      <aggregateMarketValue>1288118.17</aggregateMarketValue>
      <noOfUnitsOutstanding>204245515</noOfUnitsOutstanding>
      <approxSaleDate>05/11/2023</approxSaleDate>
      <securitiesExchangeName>NYSE</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Class A</securitiesClassTitle>
      <acquiredDate>02/17/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>2049</amountOfSecuritiesAcquired>
      <paymentDate>02/17/2022</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Class A</securitiesClassTitle>
      <acquiredDate>03/13/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>80</amountOfSecuritiesAcquired>
      <paymentDate>03/13/2022</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Class A</securitiesClassTitle>
      <acquiredDate>03/15/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>365</amountOfSecuritiesAcquired>
      <paymentDate>03/15/2022</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Class A</securitiesClassTitle>
      <acquiredDate>02/16/2023</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>1356</amountOfSecuritiesAcquired>
      <paymentDate>02/16/2023</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>James Platt</name>
        <address>
          <com:street1>James Joyce Street</com:street1>
          <com:street2>Metropolitan Building</com:street2>
          <com:city>Dublin 1</com:city>
          <com:stateOrCountry>L2</com:stateOrCountry>
          <com:zipCode>D01 K0V8</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Class A</securitiesClassTitle>
      <saleDate>02/27/2023</saleDate>
      <amountOfSecuritiesSold>2096</amountOfSecuritiesSold>
      <grossProceeds>638923.89</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>05/11/2023</noticeDate>
      <signature>/s/ Lisa Gerard, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for James Platt</signature>
    </noticeSignature>
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144
0001870432
XXXXXXXX
LIVE
0000315293
Aon plc
001-07933
METROPOLITAN BUILDING
JAMES JOYCE STREET
DUBLIN 1
L2
D01 K0Y8
35312666000
Platt James
Officer
Class A
Fidelity Brokerage Services LLC
900 Salem Street
Smithfield
RI
02917
3850
1288118.17
204245515
05/11/2023
NYSE
Class A
02/17/2022
Restricted Stock Vesting
Issuer
N
2049
02/17/2022
Compensation
Class A
03/13/2022
Restricted Stock Vesting
Issuer
N
80
03/13/2022
Compensation
Class A
03/15/2022
Restricted Stock Vesting
Issuer
N
365
03/15/2022
Compensation
Class A
02/16/2023
Restricted Stock Vesting
Issuer
N
1356
02/16/2023
Compensation
N
James Platt
James Joyce Street
Metropolitan Building
Dublin 1
L2
D01 K0V8
Class A
02/27/2023
2096
638923.89
05/11/2023
/s/ Lisa Gerard, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for James Platt