content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
    <headerData>
      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001776162</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001722482</issuerCik>
        <issuerName>Avantor, Inc.</issuerName>
        <secFileNumber>001-38912</secFileNumber>
        <issuerAddress>
          <com:street1>RADNOR CORPORATE CENTER, BUILDING ONE</com:street1>
          <com:street2>SUITE 200, 100 MATSONFORD ROAD</com:street2>
          <com:city>RADNOR</com:city>
          <com:stateOrCountry>PA</com:stateOrCountry>
          <com:zipCode>19087</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>(610) 386-1700</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Vanderhaegen Frederic</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Merrill</name>
          <address>
            <com:street1>8890 Lyra Dr 5th Flr</com:street1>
            <com:city>Columbus</com:city>
            <com:stateOrCountry>OH</com:stateOrCountry>
            <com:zipCode>43240</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>25000</noOfUnitsSold>
        <aggregateMarketValue>537000.00</aggregateMarketValue>
        <noOfUnitsOutstanding>675918430</noOfUnitsOutstanding>
        <approxSaleDate>08/24/2023</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>01/31/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted stock vest</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Avantor Inc</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>25000</amountOfSecuritiesAcquired>
        <paymentDate>01/31/2023</paymentDate>
        <natureOfPayment>na</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>08/25/2023</noticeDate>
        <signature>Frederic Vanderhaegen</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
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text: 144
  0001776162
  XXXXXXXX
  LIVE
  0001722482
  Avantor, Inc.
  001-38912
  RADNOR CORPORATE CENTER, BUILDING ONE
  SUITE 200, 100 MATSONFORD ROAD
  RADNOR
  PA
  19087
  (610) 386-1700
  Vanderhaegen Frederic
  Officer
  Common
  Merrill
  8890 Lyra Dr 5th Flr
  Columbus
  OH
  43240
  25000
  537000.00
  675918430
  08/24/2023
  NYSE
  Common
  01/31/2023
  Restricted stock vest
  Avantor Inc
  N
  25000
  01/31/2023
  na
  Y
  08/25/2023
  Frederic Vanderhaegen