Carrizo Oil & Gas (CRZO) 10-K 2012 FY Annual report

Exhibit 23.3

CONSENT OF INDEPENDENT PETROLEUM ENGINEERS

We hereby consent to the incorporation by reference in the registration statements on Form S-8 (Registration Nos. 333-181585, 333-162888, 333-137273, 333-116528, 333-55838 and 333-35245) and the registration statement on Form S-3 (Registration No. 333-173821) of Carrizo Oil & Gas, Inc. of our letter dated February 6, 2013, relating to estimates of proved reserves attributable to certain interests of Carrizo Oil & Gas, Inc. as of December 31, 2012.

/s/ RYDER SCOTT COMPANY, L.P.

RYDER SCOTT COMPANY, L.P.

TBPE Firm Registration No. F-1580

Houston, Texas

February 27, 2013