EXHIBIT 23.3

TBPE REGISTERED ENGINEERING FIRM F-1580	FAX (713) 651-0849
1100 LOUISIANA     SUITE 3800       HOUSTON, TEXAS 77002-5218	TELEPHONE (713) 651-9191

CONSENT OF INDEPENDENT PETROLEUM ENGINEERS

     We hereby consent to the incorporation by reference in the Registration Statements on Form S-8 (Registration Nos. 333-162888, 333-35245, 333-55838, 333-116528 and 333-137273) of Carrizo Oil & Gas, Inc., a Texas corporation (the “Company”), relating to the Incentive Plan of the Company, and the Registration Statements on Form S-3 (Registration Nos. 333-159237, 333-142345 and 333-142346) of the Company (collectively, the “Registration Statements”) of information contained in our reserve report that is summarized as of December 31, 2009 in our summary letter dated February 23, 2010, relating to the oil and gas reserves and revenue, as of December 31, 2009, of certain interests of the Company.

     We hereby consent to all references to such reports, letters and/or to this firm in each of the Registration Statements and each Prospectus to which any such Registration Statement relates, and further consent to our being named as an expert in each of the Registration Statements and each Prospectus to which any such Registration Statement relates.

\s\ Ryder Scott Company, L.P.

RYDER SCOTT COMPANY, L.P.
TBPE Firm Registration No. -1580

Houston, Texas
March 12, 2010

1200, 530 8TH AVENUE, S.W.	CALGARY, ALBERTA T2P 3S8	TEL (403) 262-2799	FAX (403) 262-2790
621 17TH STREET, SUITE 1550	DENVER, COLORADO 80293-1501	TEL (303) 623-9147	FAX (303) 623-4258