EXHIBIT 23.3

               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

We consent to the reference to our firm under the caption "Experts" in the
Registration Statement (Form S-3) and related Prospectus of Mentor Graphics
Corporation for the registration of 6 7/8% Convertible Subordinated Notes Due
2007 and 7,412,978 shares of its common stock and to the incorporation by
reference therein of our report dated October 29, 2001 (except for the last six
paragraphs of Note 11, as to which the date is December 14, 2001, and the last
paragraph of Note 12, as to which the date is December 7, 2001), with respect to
the consolidated financial statements of IKOS Systems, Inc. included in the
Current Report on Form 8-K/A of Mentor Graphics Corporation filed with the
Securities and Exchange Commission on May 29, 2002.

                                        /s/ Ernst & Young LLP

San Jose, California
August 28, 2002