Exhibit 23.3

CONSENT OF INDEPENDENT PETROLEUM ENGINEERS AND GEOLOGISTS

The undersigned hereby consents to the references to our firm in the form and context in which they appear in this Registration Statement on Form S-3 of Concho Resources Inc. and the related prospectus that is a part thereof. We hereby further consent to the use in such Registration Statement and prospectus of information contained in (i) our report setting forth the estimates of revenues from Concho Resources Inc.’s oil and gas reserves as of December 31, 2009 and (ii) our reports setting forth the estimates of revenue from Marbob Energy Corporation and Its Affiliates Interests’ oil and gas reserves as of December 31, 2009, 2008, 2007 and 2006. We further consent to the reference to this firm under heading “Experts.”

CAWLEY, GILLESPIE & ASSOCIATES, INC.  

 
/s/ J. Zane Meekins

J. Zane Meekins, P.E.
Senior Vice President

Fort Worth, Texas
December 7, 2010