<?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>0001208109</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001101302</issuerCik>
      <issuerName>ENTEGRIS INC</issuerName>
      <secFileNumber>001-32598</secFileNumber>
      <issuerAddress>
        <com:street1>129 CONCORD ROAD</com:street1>
        <com:city>BILLERICA</com:city>
        <com:stateOrCountry>MA</com:stateOrCountry>
        <com:zipCode>01821</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>9784366500</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>GRAVES GREGORY B</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Former Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</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>10123</noOfUnitsSold>
      <aggregateMarketValue>1061902.70</aggregateMarketValue>
      <noOfUnitsOutstanding>149685161</noOfUnitsOutstanding>
      <approxSaleDate>06/06/2023</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>06/06/2023</acquiredDate>
      <natureOfAcquisitionTransaction>Option Granted - 02/05/2019</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>10123</amountOfSecuritiesAcquired>
      <paymentDate>06/06/2023</paymentDate>
      <natureOfPayment>Cash</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <remarks>This Form 144 amends and supersedes the Form 144 filed on June 06, 2023. The grant date of the options exercised was updated.</remarks>
    <noticeSignature>
      <noticeDate>06/06/2023</noticeDate>
      <signature>/s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Gregory B. Graves</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
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144
0001208109
XXXXXXXX
LIVE
0001101302
ENTEGRIS INC
001-32598
129 CONCORD ROAD
BILLERICA
MA
01821
9784366500
GRAVES GREGORY B
Former Officer
Common
Fidelity Brokerage Services LLC
900 Salem Street
Smithfield
RI
02917
10123
1061902.70
149685161
06/06/2023
NASDAQ
Common
06/06/2023
Option Granted - 02/05/2019
Issuer
N
10123
06/06/2023
Cash
Y
This Form 144 amends and supersedes the Form 144 filed on June 06, 2023. The grant date of the options exercised was updated.
06/06/2023
/s/ Gary Redman, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Gregory B. Graves