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>0001684076</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>Couturier Christophe</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>1498</noOfUnitsSold>
        <aggregateMarketValue>31727.00</aggregateMarketValue>
        <noOfUnitsOutstanding>674443506</noOfUnitsOutstanding>
        <approxSaleDate>04/11/2023</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <acquiredDate>04/05/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted stock vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Avantor</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1498</amountOfSecuritiesAcquired>
        <paymentDate>04/05/2023</paymentDate>
        <natureOfPayment>NA</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Christophe Couturier</name>
          <address>
            <com:street1>100 Matsonford Rd</com:street1>
            <com:city>Radnor</com:city>
            <com:stateOrCountry>PA</com:stateOrCountry>
            <com:zipCode>19087</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>02/28/2023</saleDate>
        <amountOfSecuritiesSold>2324</amountOfSecuritiesSold>
        <grossProceeds>56520.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Christophe Couturier</name>
          <address>
            <com:street1>100 Matsonford Rd</com:street1>
            <com:city>Radnor</com:city>
            <com:stateOrCountry>PA</com:stateOrCountry>
            <com:zipCode>19087</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>02/22/2023</saleDate>
        <amountOfSecuritiesSold>19160</amountOfSecuritiesSold>
        <grossProceeds>422636.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Christophe Couturier</name>
          <address>
            <com:street1>100 MAtsonford Rd</com:street1>
            <com:city>Radnor</com:city>
            <com:stateOrCountry>PA</com:stateOrCountry>
            <com:zipCode>19087</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Common</securitiesClassTitle>
        <saleDate>02/23/2023</saleDate>
        <amountOfSecuritiesSold>3078</amountOfSecuritiesSold>
        <grossProceeds>74610.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>04/11/2023</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>12/06/2022</planAdoptionDate>
        </planAdoptionDates>
        <signature>Christophe Couturier</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 4641}]
text: 144
  0001684076
  XXXXXXXX
  LIVE
  0001722482
  Avantor, Inc.
  001-38912
  RADNOR CORPORATE CENTER, BUILDING ONE
  SUITE 200, 100 MATSONFORD ROAD
  RADNOR
  PA
  19087
  (610) 386-1700
  Couturier Christophe
  Officer
  common
  Merrill
  8890 Lyra Dr 5th Flr
  Columbus
  OH
  43240
  1498
  31727.00
  674443506
  04/11/2023
  NASDAQ
  Common
  04/05/2023
  Restricted stock vesting
  Avantor
  N
  1498
  04/05/2023
  NA
  N
  Christophe Couturier
  100 Matsonford Rd
  Radnor
  PA
  19087
  Common
  02/28/2023
  2324
  56520.00
  Christophe Couturier
  100 Matsonford Rd
  Radnor
  PA
  19087
  Common
  02/22/2023
  19160
  422636.00
  Christophe Couturier
  100 MAtsonford Rd
  Radnor
  PA
  19087
  Common
  02/23/2023
  3078
  74610.00
  04/11/2023
  12/06/2022
  Christophe Couturier