<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:ns2="http://www.sec.gov/edgar/common">
    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001206990</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0000883241</issuerCik>
            <issuerName>SYNOPSYS INC.</issuerName>
            <secFileNumber>000-19807</secFileNumber>
            <issuerAddress>
                <ns2:street1>690 East Middlefield Road</ns2:street1>
                <ns2:city>Mountain View</ns2:city>
                <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                <ns2:zipCode>94043</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(650) 584-5000</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>JOHN FREDERICK RUNKEL JR</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>E*TRADE FINANCIAL CORPORATION</name>
                <address>
                    <ns2:street1>3 EDISON DRIVE</ns2:street1>
                    <ns2:city>ALPHARETTA</ns2:city>
                    <ns2:stateOrCountry>GA</ns2:stateOrCountry>
                    <ns2:zipCode>30005</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>1831</noOfUnitsSold>
            <aggregateMarketValue>833105.00</aggregateMarketValue>
            <noOfUnitsOutstanding>152159561</noOfUnitsOutstanding>
            <approxSaleDate>05/30/2023</approxSaleDate>
            <securitiesExchangeName>NASD</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <acquiredDate>05/30/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Stock Option Exercise</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1831</amountOfSecuritiesAcquired>
            <paymentDate>05/30/2023</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>JOHN FREDERICK RUNKEL JR</name>
                <address>
                    <ns2:street1>690 East Middlefield Road</ns2:street1>
                    <ns2:city>Mountain View</ns2:city>
                    <ns2:stateOrCountry>CA</ns2:stateOrCountry>
                    <ns2:zipCode>94043</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/19/2023</saleDate>
            <amountOfSecuritiesSold>2142</amountOfSecuritiesSold>
            <grossProceeds>884710.26</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>05/30/2023</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>06/24/2022</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ John Frederick Runkel, Jr.</signature>
        </noticeSignature>
    </formData>
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144
0001206990
XXXXXXXX
LIVE
0000883241
SYNOPSYS INC.
000-19807
690 East Middlefield Road
Mountain View
CA
94043
(650) 584-5000
JOHN FREDERICK RUNKEL JR
Officer
Common
E*TRADE FINANCIAL CORPORATION
3 EDISON DRIVE
ALPHARETTA
GA
30005
1831
833105.00
152159561
05/30/2023
NASD
COMMON
05/30/2023
Stock Option Exercise
ISSUER
N
1831
05/30/2023
Cash
N
JOHN FREDERICK RUNKEL JR
690 East Middlefield Road
Mountain View
CA
94043
Common
05/19/2023
2142
884710.26
05/30/2023
06/24/2022
/s/ John Frederick Runkel, Jr.