<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0206</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2025-10-21</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0002026767</issuerCik>
        <issuerName>Calisa Acquisition Corp</issuerName>
        <issuerTradingSymbol>ALIS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001436468</rptOwnerCik>
            <rptOwnerName>Zhang Dahe</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>420 LEXINGTON AVE, SUITE 2446</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10170</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>822525</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Calisa Holding LP</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Rights</value>
                <footnoteId id="F3"/>
            </securityTitle>
            <conversionOrExercisePrice>
                <footnoteId id="F3"/>
            </conversionOrExercisePrice>
            <exerciseDate>
                <footnoteId id="F3"/>
            </exerciseDate>
            <expirationDate>
                <footnoteId id="F3"/>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Ordinary Shares</value>
                    <footnoteId id="F3"/>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>6352</value>
                    <footnoteId id="F3"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Calisa Holding LP</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Includes (i) 63,525 shares contained within units that Calisa Holding LP has irrevocably agreed to purchase at the  closing of the Issuer's initial public offering (the &quot;IPO&quot;) and (ii) 99 shares subject to forfeiture in the event the underwriters of the IPO do not exercise their over-allotment option.  Does not include an additional 4,529 shares contained within units that Calisa Holding LP has irrevocably agreed to purchase in connection with the IPO if and only if the underwriters of the IPO fully exercise their over-allotment option.</footnote>
        <footnote id="F2">Calisa Management LLC is the managing member of Calisa Holding LP and Dahe Zhang is the manager of Calisa Management LLC.</footnote>
        <footnote id="F3">Represents 63,525 rights contained within units that Calisa Holding LP has irrevocably agreed to purchase at the closing of the IPO.  Does not include an additional 4,529 rights (representing 453 ordinary shares issuable upon conversion of such rights) contained within units that Calisa Holding LP has irrevocably agreed to purchase in connection with the IPO if and only if the underwriters of the IPO fully exercise their over-allotment option.  Each right will convert automatically into 1/10 of one ordinary share at the closing of an initial business combination by the Issuer.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>Dahe Zhang</signatureName>
        <signatureDate>2025-10-21</signatureDate>
    </ownerSignature>
</ownershipDocument>
