Exhibit 23.3
Cawley, Gillespie & Associates, Inc.
PETROLEUM CONSULTANTS
302 FORT WORTH CLUB BUILDING
306 WEST SEVENTH STREET
FORT WORTH, TEXAS 76102-4987
(817) 336-2461
PETROLEUM CONSULTANTS
302 FORT WORTH CLUB BUILDING
306 WEST SEVENTH STREET
FORT WORTH, TEXAS 76102-4987
(817) 336-2461
CONSENT OF CAWLEY, GILLESPIE & ASSOCIATES, INC.
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-1 of Approach 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 our report setting forth the estimates of
revenues from Approach Resources Inc.’s oil and gas reserves as of December 31, 2004 and December
31, 2005.
We further consent to the reference to this firm under heading “Experts.”
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| CAWLEY, GILLESPIE & ASSOCIATES, INC. | ||
Fort Worth, Texas July 11, 2007 |