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 Allakos Inc. for the registration of $250 million of its common stock and to the incorporation by reference therein of our report dated March 6, 2023, with respect to the financial statements of Allakos 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

San Mateo, California

November 13, 2023