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, 333-34907, 33-59241, 33-60503, 333-74205,
333-84585, 333-85607, 333-87227, 333-93029 and 333-30370) 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 18, 2000, with respect to the consolidated financial
statements of XOMA Ltd. included in this Annual Report (Form 10-K) for the year
ended December 31, 1999.

Palo Alto, California                             ERNST & YOUNG LLP
March 17, 2000