Exhibit 23 Consent of Independent Auditors We consent to the incorporation by reference in the Registration Statements (Forms S-3, No. 333-15533, 33-58736, 33-60229, 33-78760, 33-72170, 33-68542) and (Forms S-8 No. 33-45348, 33-75466, 33-88826 and 333-87153) of Enzo Biochem, Inc. and in the related Prospectus of our report dated October 4, 2001, with respect to the consolidated financial statements and schedule of Enzo Biochem, Inc. included in this Annual Report (Form 10-K) for the fiscal year ended July 31, 2001. /s/ Ernst & Young LLP Melville, New York October 26, 2001