Exhibit 23.1
Consent of Independent Registered Public Accounting Firm
We consent to the incorporation by reference in the Registration Statement (Form S-8) pertaining to the 2021 Equity Incentive Plan and 2021 Employee Stock Purchase Plan of Theseus Pharmaceuticals, Inc. of our report dated March 9, 2023, with respect to the consolidated financial statements of Theseus Pharmaceuticals, Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 2022, filed with the Securities and Exchange Commission.
/s/ Ernst & Young LLP
Boston, Massachusetts
March 9, 2023