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Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in this Registration Statement on Form S-8 of our report dated March 11, 2026, relating to the financial statements of Foghorn Therapeutics Inc., appearing in the Annual Report on Form 10-K of Foghorn Therapeutics Inc. for the year ended December 31, 2025.

/s/ Deloitte & Touche LLP

Boston, Massachusetts

March 26, 2026