content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
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      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001806189</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001673985</issuerCik>
        <issuerName>AdvanSix Inc.</issuerName>
        <secFileNumber>001-37774</secFileNumber>
        <issuerAddress>
          <com:street1>300 KIMBALL DRIVE</com:street1>
          <com:street2>SUITE 101</com:street2>
          <com:city>PARSIPPANY</com:city>
          <com:stateOrCountry>NJ</com:stateOrCountry>
          <com:zipCode>07054</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>(973) 526-1800</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Kintiroglou Achilles B.</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Merrill Lynch</name>
          <address>
            <com:street1>225 Liberty St</com:street1>
            <com:street2>Floor 37</com:street2>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10281</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>3335</noOfUnitsSold>
        <aggregateMarketValue>117625.45</aggregateMarketValue>
        <noOfUnitsOutstanding>27564614</noOfUnitsOutstanding>
        <approxSaleDate>06/12/2023</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/24/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting of restricted stock unit award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>AdvanSix Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1608</amountOfSecuritiesAcquired>
        <paymentDate>02/24/2022</paymentDate>
        <natureOfPayment>Granted as part of issuer equity compensation plan</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/28/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting of restricted stock unit award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>AdvanSix Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>853</amountOfSecuritiesAcquired>
        <paymentDate>02/28/2022</paymentDate>
        <natureOfPayment>Granted as part of issuer equity compensation plan</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/28/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Vesting of restricted stock unit award</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>AdvanSix Inc.</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>874</amountOfSecuritiesAcquired>
        <paymentDate>02/28/2023</paymentDate>
        <natureOfPayment>Granted as part of issuer equity compensation plan</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>06/12/2023</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>03/10/2023</planAdoptionDate>
        </planAdoptionDates>
        <signature>Achilles Kintiroglou</signature>
      </noticeSignature>
    </formData>
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text: 144
  0001806189
  XXXXXXXX
  LIVE
  0001673985
  AdvanSix Inc.
  001-37774
  300 KIMBALL DRIVE
  SUITE 101
  PARSIPPANY
  NJ
  07054
  (973) 526-1800
  Kintiroglou Achilles B.
  Officer
  Common Stock
  Merrill Lynch
  225 Liberty St
  Floor 37
  New York
  NY
  10281
  3335
  117625.45
  27564614
  06/12/2023
  NYSE
  Common Stock
  02/24/2022
  Vesting of restricted stock unit award
  AdvanSix Inc.
  N
  1608
  02/24/2022
  Granted as part of issuer equity compensation plan
  Common Stock
  02/28/2022
  Vesting of restricted stock unit award
  AdvanSix Inc.
  N
  853
  02/28/2022
  Granted as part of issuer equity compensation plan
  Common Stock
  02/28/2023
  Vesting of restricted stock unit award
  AdvanSix Inc.
  N
  874
  02/28/2023
  Granted as part of issuer equity compensation plan
  Y
  06/12/2023
  03/10/2023
  Achilles Kintiroglou