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

    <schemaVersion>X0607</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2026-03-18</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0002014955</issuerCik>
        <issuerName>Smart Digital Group Ltd</issuerName>
        <issuerTradingSymbol>SDM</issuerTradingSymbol>
        <issuerForeignTradingSymbol></issuerForeignTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0002125676</rptOwnerCik>
            <rptOwnerName>Wai Hong Sam</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerNonUSAddressFlag>true</rptOwnerNonUSAddressFlag>
            <rptOwnerStreet1>NO. 2615, XINGSHENG 1ST ROAD,</rptOwnerStreet1>
            <rptOwnerStreet2>HENGQIN NEW DISTRICT</rptOwnerStreet2>
            <rptOwnerCity>ZHUHAI, GUANGDONG</rptOwnerCity>
            <rptOwnerNonUSStateTerritory></rptOwnerNonUSStateTerritory>
            <rptOwnerCountry>F4</rptOwnerCountry>
            <rptOwnerZipCode>519000</rptOwnerZipCode>
            <rptOwnerStateDescription>CHINA</rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle></officerTitle>
            <otherText></otherText>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>10000000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By CHINAINVEST INTERNATIONAL GROUP CO., LTD.</value>
                    <footnoteId id="F1"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Ordinary Shares</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>500000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Winwin Asia Group Co., Ltd</value>
                    <footnoteId id="F2"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Represents 10,000,000 Ordinary Shares held by SAM WAI HONG through CHINAINVEST INTERNATIONAL GROUP CO., LTD. SAM WAI HONG holds 100% of equity interests in CHINAINVEST INTERNATIONAL GROUP CO., LTD., a company organized under the laws of Macau. The registered address of CHINAINVEST INTERNATIONAL GROUP CO., LTD. is 2nd Floor, AY1, Phase 1 of Sun City Commercial Center, Avenida de Artur Tamagnini Barbosa, Macau.</footnote>
        <footnote id="F2">Represents 500,000 Ordinary Shares held by SAM WAI HONG through Winwin Asia Group Co., Ltd. SAM WAI HONG holds 100% of equity interests in and is the sole director of Winwin Asia Group Co., Ltd, a company incorporated under the laws of British Virgin Islands. The registered address of Winwin Asia Group Co., Ltd is OMC Chambers, Wickhams Cay 1, Road Town, Tortola, British Virgin Islands.</footnote>
    </footnotes>

    <ownerSignature>
        <signatureName>/s/ SAM WAI HONG</signatureName>
        <signatureDate>2026-03-18</signatureDate>
    </ownerSignature>
</ownershipDocument>
