Exhibit 23.1

Independent Auditors' Report and Consent

The Board of Directors
Siebel Systems, Inc.:

The audits referred to in our report dated January 21, 2002 included the related financial statement schedule as of December 31, 2001, and for each of the years in the three-year period ended December 31, 2001, as listed in the Index in Item 14(a)2 herein. The financial statement schedule is the responsibility of the Company's management. Our responsibility is to express an opinion on the financial statement schedule based on our audits. In our opinion, the financial statement schedule, when considered in relation to the basic consolidated financial statements taken as a whole, presents fairly in all material respects, the information set forth therein.

We consent to incorporation by reference in the registration statements on Forms S-3 (Nos. 333-47062, 333-68041, and 333-91777) and Forms S-8 (Nos. 333-07983, 333-22763, 333-40437, 333-53369, 333-72969, 333-85007, 333-94243, 333-41792, 333-49986, 333-51018, 333-52998, 333-55406, 333-59526, 333-72218, and 333-75052) of Siebel Systems, Inc. of our reports dated January 21, 2002, relating to the consolidated balance sheets of Siebel Systems, Inc. and subsidiaries as of December 31, 2000 and 2001, and the related consolidated statements of operations and comprehensive income, stockholders' equity and cash flows for each of the years in the three-year period ended December 31, 2001, and related consolidated financial statement schedule, which reports appear in the December 31, 2001 annual report on Form 10-K of Siebel Systems, Inc.

/s/ KPMG LLP

Mountain View, California
March 25, 2002