Exhibit 23.1
CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
We consent to the reference to our firm under the caption “Experts” in the Registration Statement (Form S-3) and related Prospectus of Gritstone bio, Inc. for the registration of 5,000,000 shares of its common stock and to the incorporation by reference therein of our report dated March 11, 2021, with respect to the consolidated financial statements of Gritstone bio, Inc., included in its Annual Report (Form 10-K) for the year ended December 31, 2020, filed with the Securities and Exchange Commission.
/s/ Ernst & Young LLP
Redwood City, California
October 15, 2021
