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                                                                    EXHIBIT 23.3

                    [Letterhead of Ryder Scott Company, L.P.]

                   Consent of Independent Petroleum Engineers

          We hereby consent to the incorporation by reference in this
Registration Statement of Carrizo Oil & Gas, Inc., a Texas corporation (the
"Company"), on Form S-8 of information contained in our reserve report that is
summarized as of March 31, 1997 in our summary letter dated June 9, 1997,
relating to the oil and gas reserves and revenue, as of March 31, 1997, of
certain interests of the Company, appearing in the Prospectus that is part of
the Company's Registration Statement on Form S-1 (Reg. No. 333-29187).

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

                                              /s/ RYDER SCOTT COMPANY, L.P.
                                                  RYDER SCOTT COMPANY

Houston, Texas
February 8, 2001