Exhibit 23.1

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CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

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We have issued our report dated December 22, 2025, with respect to the consolidated financial statements included in the Annual Report of Innovative Solutions and Support, Inc. on Form 10-K for the year ended September 30, 2025. We consent to the incorporation by reference of said report in the Registration Statements of Innovative Solutions and Support, Inc. on Forms S-3 (File No. 333-290859 and File No. 333-267595) and Forms S-8 (File No. 333-163712 and File No. 333-235689).

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/s/ GRANT THORNTON LLP

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Philadelphia, Pennsylvania December 22, 2025