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 2024 Equity Incentive Plan and the 2024 Employee Stock Purchase Plan of Zenas BioPharma, Inc. of our report dated March 11, 2025, with respect to the consolidated financial statements of Zenas BioPharma, Inc. included in its Annual Report (Form 10-K) for the year ended December 31, 2024, filed with the Securities and Exchange Commission.

/s/ Ernst & Young LLP

Boston, Massachusetts 

March 11, 2025