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<ownershipDocument>

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    <periodOfReport>2021-04-20</periodOfReport>

    <notSubjectToSection16>1</notSubjectToSection16>

    <issuer>
        <issuerCik>0001058057</issuerCik>
        <issuerName>MARVELL TECHNOLOGY GROUP LTD</issuerName>
        <issuerTradingSymbol>N/A</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001381430</rptOwnerCik>
            <rptOwnerName>MURPHY MATTHEW J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>5488 MARVELL LANE</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>SANTA CLARA</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>95054</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>CEO and President</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

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                <value>Common Shares</value>
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                </transactionShares>
                <transactionPricePerShare>
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                    <footnoteId id="F2"/>
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            <ownershipNature>
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                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>By Trust</value>
                    <footnoteId id="F3"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
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        <derivativeTransaction>
            <securityTitle>
                <value>Performance Based Restricted Stock Units</value>
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                <value></value>
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                    <value>888099</value>
                </transactionShares>
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                    <footnoteId id="F8"/>
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    <footnotes>
        <footnote id="F1">On April 20, 2021, pursuant to the Agreement and Plan of Merger and Reorganization, dated as of October 29, 2020 (the &quot;Merger Agreement&quot;), by and among Marvell Technology Group Ltd. (&quot;Marvell&quot;), Marvell Technology, Inc. (f/k/a Maui HoldCo, Inc.), a wholly owned subsidiary of Marvell (&quot;HoldCo&quot;), Maui Acquisition Company Ltd, a wholly owned subsidiary of HoldCo (&quot;Bermuda Merger Sub&quot;), Indigo Acquisition Corp., a wholly owned subsidiary of HoldCo (&quot;Delaware Merger Sub&quot;), and Inphi Corporation (&quot;Inphi&quot;), Bermuda Merger Sub merged with and into Marvell with Marvell as the surviving corporation and a wholly owned subsidiary of Holdco (the &quot;Bermuda Merger&quot;), and Delaware Merger Sub merged with and into Inphi with Inphi as the surviving corporation and a wholly owned subsidiary of Holdco (the &quot;Delaware Merger&quot; and, together with the Bermuda Merger, the &quot;Mergers&quot;).</footnote>
        <footnote id="F2">(Continued from footnote 1) At the effective time of the Bermuda Merger, each common share of Marvell, par value $0.002 per share (&quot;Marvell Share&quot;), was automatically converted into the right to receive one share of HoldCo common stock, par value $0.002 per share (&quot;HoldCo Stock&quot;).</footnote>
        <footnote id="F3">Shares held by Matthew and Laura Murphy as co-trustees of the Matthew and Laura Murphy Family Trust UTD 7/10/2007.</footnote>
        <footnote id="F4">Each restricted stock unit represents a contingent right to receive one Marvell Share upon vesting. At the effective time of the Bermuda Merger, each restricted stock unit related to a Marvell Share was assumed by HoldCo pursuant to the Merger Agreement and converted into a restricted stock unit relating to a share of HoldCo Stock, on the same terms and conditions as the original award (including with respect to vesting) that applied to such restricted stock unit immediately prior to the Mergers, except that, for the performance-based restricted stock units, the performance measures will relate to HoldCo instead of Marvell.</footnote>
        <footnote id="F5">The restricted stock units vest on each of 7/15/2021, 10/15/2021, 1/15/2022 and 4/15/2022.</footnote>
        <footnote id="F6">The restricted stock units vest on each of 7/15/2021, 10/15/2021, 1/15/2022, 4/15/2022, 7/15/2022, 10/15/2022, 1/15/2023 and 4/15/2023.</footnote>
        <footnote id="F7">The restricted stock units vest on each of 7/15/2021, 10/15/2021, 1/15/2022, 4/15/2022, 7/15/2022, 10/15/2022, 1/15/2023, 4/15/2023, 7/15/2023, 10/15/2023, 1/15/2024, and 4/15/2024.</footnote>
        <footnote id="F8">Value Creation Award that has been designed to provide a strong incentive to create a substantial increase in shareholder value. Vesting of these performance-based restricted stock units is dependent upon a significant increase in Marvell's stock price. The performance condition will be satisfied once Marvell's average stock price equals or exceeds $40.00 per share for 100 calendar days prior to the fourth anniversary of the date of grant (&quot;Performance Condition&quot;). The shares vest one year after the date the Performance Condition is satisfied. In the event of a change in control, the Performance Condition may be deemed partially satisfied depending on the value received in the transaction.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>/s/  Matthew J. Murphy, by Blair Walters as Attorney-in-Fact</signatureName>
        <signatureDate>2021-04-20</signatureDate>
    </ownerSignature>
</ownershipDocument>
