Exhibit 23.1


               CONSENT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

     We consent to the incorporation by reference in the Registration Statements
on Form S-3 (Nos. 333-07263, 333-50134, 33-59241, 33-60503, 333-74205,
333-84585, 333-85607, 333-87227, 333-93029, 333-30370 and 333-82334) and the
related Prospectuses and in the Registration Statements on Form S-8 (Nos.
333-66171 and 333-39155) pertaining to the Share Option Plan, Restricted Shares
Plan, Directors Share Option Plan and Employee Share Purchase Plan of XOMA Ltd.
of our report dated February 8, 2002, with respect to the consolidated financial
statements of XOMA Ltd. included in this Annual Report (Form 10-K) for the year
ended December 31, 2001.

                                                     /s/ ERNST & YOUNG LLP


Palo Alto, California
March 28, 2002