Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We consent to the reference to our firm under the caption “Experts” and to the use of our report dated April 29, 2011 (except Notes 1, 2, 11 and 13, as to which the date is June 23, 2011) in the Registration Statement (Form S-1) and related Prospectus of Clovis Oncology, Inc. dated June 23, 2011.

/s/ Ernst & Young LLP  

Denver, Colorado
June 23, 2011