<?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>0001583180</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0000813672</issuerCik>
      <issuerName>CADENCE DESIGN SYSTEMS INC</issuerName>
      <secFileNumber>000-15867</secFileNumber>
      <issuerAddress>
        <com:street1>2655 SEELY AVENUE BLDG 5</com:street1>
        <com:city>SAN JOSE</com:city>
        <com:stateOrCountry>CA</com:stateOrCountry>
        <com:zipCode>95134</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>4089431234</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>BECKLEY THOMAS P</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Charles Schwab &amp; Co., Inc.</name>
        <address>
          <com:street1>3000 Schwab Way</com:street1>
          <com:city>Westlake</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>76262</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>76003</noOfUnitsSold>
      <aggregateMarketValue>15909459.00</aggregateMarketValue>
      <noOfUnitsOutstanding>272684000</noOfUnitsOutstanding>
      <approxSaleDate>05/18/2023</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>05/18/2023</acquiredDate>
      <natureOfAcquisitionTransaction>Employee Stock Option Exercise</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>CADENCE DESIGN SYSTEMS, INC.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>50775</amountOfSecuritiesAcquired>
      <paymentDate>05/18/2023</paymentDate>
      <natureOfPayment>Broker Payment for Cashless Exercise</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>08/08/2016</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Lapse</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>CADENCE DESIGN SYSTEMS, INC.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>3599</amountOfSecuritiesAcquired>
      <paymentDate>08/08/2016</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>02/08/2017</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Lapse</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>CADENCE DESIGN SYSTEMS, INC.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>4580</amountOfSecuritiesAcquired>
      <paymentDate>02/08/2017</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>08/08/2017</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Lapse</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>CADENCE DESIGN SYSTEMS, INC.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>3599</amountOfSecuritiesAcquired>
      <paymentDate>08/08/2017</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>02/08/2018</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Lapse</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>CADENCE DESIGN SYSTEMS, INC.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>4629</amountOfSecuritiesAcquired>
      <paymentDate>02/08/2018</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>08/08/2018</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Lapse</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>CADENCE DESIGN SYSTEMS, INC.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>4049</amountOfSecuritiesAcquired>
      <paymentDate>08/08/2018</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>02/08/2019</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Lapse</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>CADENCE DESIGN SYSTEMS, INC.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>4772</amountOfSecuritiesAcquired>
      <paymentDate>02/08/2019</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>05/18/2023</noticeDate>
      <planAdoptionDates>
        <planAdoptionDate>02/17/2023</planAdoptionDate>
      </planAdoptionDates>
      <signature>THOMAS P BECKLEY</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
[{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 6282}]
144
0001583180
XXXXXXXX
LIVE
0000813672
CADENCE DESIGN SYSTEMS INC
000-15867
2655 SEELY AVENUE BLDG 5
SAN JOSE
CA
95134
4089431234
BECKLEY THOMAS P
Officer
Common
Charles Schwab & Co., Inc.
3000 Schwab Way
Westlake
TX
76262
76003
15909459.00
272684000
05/18/2023
NASDAQ
Common
05/18/2023
Employee Stock Option Exercise
CADENCE DESIGN SYSTEMS, INC.
N
50775
05/18/2023
Broker Payment for Cashless Exercise
Common
08/08/2016
Restricted Stock Lapse
CADENCE DESIGN SYSTEMS, INC.
N
3599
08/08/2016
Equity Compensation
Common
02/08/2017
Restricted Stock Lapse
CADENCE DESIGN SYSTEMS, INC.
N
4580
02/08/2017
Equity Compensation
Common
08/08/2017
Restricted Stock Lapse
CADENCE DESIGN SYSTEMS, INC.
N
3599
08/08/2017
Equity Compensation
Common
02/08/2018
Restricted Stock Lapse
CADENCE DESIGN SYSTEMS, INC.
N
4629
02/08/2018
Equity Compensation
Common
08/08/2018
Restricted Stock Lapse
CADENCE DESIGN SYSTEMS, INC.
N
4049
08/08/2018
Equity Compensation
Common
02/08/2019
Restricted Stock Lapse
CADENCE DESIGN SYSTEMS, INC.
N
4772
02/08/2019
Equity Compensation
Y
05/18/2023
02/17/2023
THOMAS P BECKLEY