Exhibit 15.1

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CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

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We have issued our report dated April 30, 2026, with respect to the consolidated financial statements included in the Annual Report on Form 20-F for the year ended December 31, 2025. We consent to the incorporation by reference of the said report in the Registration Statements of Lanvin Group Holdings Limited on Forms F-3 (File Nos. 333-276476, 333-280891 and 333-269150).

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GRANT THORNTON ZHITONG CERTIFIED PUBLIC ACCOUNTANTS LLP

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