<?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>0001867853</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001362004</issuerCik>
            <issuerName>ICF INTERNATIONAL, INC.</issuerName>
            <secFileNumber>001-33045</secFileNumber>
            <issuerAddress>
                <ns2:street1>1902 RESTON METRO PLAZA</ns2:street1>
                <ns2:city>RESTON</ns2:city>
                <ns2:stateOrCountry>VA</ns2:stateOrCountry>
                <ns2:zipCode>20190</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(703) 934-3000</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>RODNEY MARK LEE</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>38th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>3169</noOfUnitsSold>
            <aggregateMarketValue>412049.92</aggregateMarketValue>
            <noOfUnitsOutstanding>18814675</noOfUnitsOutstanding>
            <approxSaleDate>08/09/2023</approxSaleDate>
            <securitiesExchangeName>NASD</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>11/06/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>829</amountOfSecuritiesAcquired>
            <paymentDate>11/06/2022</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>03/21/2023</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>1828</amountOfSecuritiesAcquired>
            <paymentDate>03/21/2023</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>05/08/2022</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted stock vesting under a registered plan</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>512</amountOfSecuritiesAcquired>
            <paymentDate>05/08/2022</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>08/09/2023</noticeDate>
            <planAdoptionDates/>
            <signature>/s/ Rodney Mark Lee</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
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144
0001867853
XXXXXXXX
LIVE
0001362004
ICF INTERNATIONAL, INC.
001-33045
1902 RESTON METRO PLAZA
RESTON
VA
20190
(703) 934-3000
RODNEY MARK LEE
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
38th Floor
New York
NY
10004
3169
412049.92
18814675
08/09/2023
NASD
Common
11/06/2022
Restricted stock vesting under a registered plan
Issuer
N
829
11/06/2022
Not Applicable
Common
03/21/2023
Restricted stock vesting under a registered plan
Issuer
N
1828
03/21/2023
Not Applicable
Common
05/08/2022
Restricted stock vesting under a registered plan
Issuer
N
512
05/08/2022
Not Applicable
Y
08/09/2023
/s/ Rodney Mark Lee