Exhibit 23 CONSENT OF INDEPENDENT AUDITORS We consent to the incorporation by reference of our report dated March 15, 2001, with respect to the consolidated financial statements and schedule of Phillips Petroleum Company included in the Annual Report (Form 10-K) for the year ended December 31, 2000, in the following registration statements and related prospectuses. Phillips Petroleum Company Form S-4 File No. 333-55932 Phillips Petroleum Company Form S-3 File No. 333-34336 Phillips Petroleum Company Form S-3 File No. 033-54987 Thrift Plan of Phillips Petroleum Company Form S-8 File No. 033-50134 Long-Term Stock Savings Plan of Phillips Petroleum Company Form S-8 File No. 333-67073 Retirement Savings Plan of Phillips Petroleum Company Form S-8 File No. 033-28669 Omnibus Securities Plan of Phillips Petroleum Company Form S-8 File No. 333-31355 Phillips Petroleum Company Stock Plan for Non-Employee Directors Form S-8 File No. 333-67059 Phillips Petroleum Overseas Stock Savings Plan Form S-8 File No. 333-65769 Employee Share Allocation Scheme of Phillips Petroleum Company United Kingdom Limited Form S-8 File No. 333-65771 /s/ Ernst & Young LLP ERNST & YOUNG LLP Tulsa, Oklahoma March 15, 2001