Exhibit 23 CONSENT OF INDEPENDENT AUDITORS We consent to the incorporation by reference in the following Registration Statements and related Prospectuses of First Bank System, Inc. of our report dated January 9, 1997, with respect to the consolidated financial statements of First Bank System, Inc. included in this Annual Report (Form 10-K) for the year ended December 31, 1996. Registration Form Statement No. Purpose ---- ------------- ------- S-8 33-16242 1987 Stock Option Plan S-8 33-42333 Employee Stock Purchase Plan S-8 33-55932 WCIC Options S-8 33-52835 1988 Equity Participation Plan S-8 333-01099 FirsTier Financial, Inc. Omnibus Equity Plan (as assumed by First Bank System, Inc.) S-8 333-01421 1994 & 1991 Stock Incentive Plan S-8 333-02623 1996 Stock Incentive Plan S-8 333-02621 Amended & Restated Employee Stock Purchase Plan S-8 333-21291 Capital Accumulation Plan S-3 33-38268 Northern Cities Bancorp Acquisition S-3 33-33508 Dividend Reinvestment Plan S-3 33-47785 Siouxland acquisition S-3 33-57169 Metropolitan Financial Corporation warrants S-3 33-55485 First Dakota Financial Corporation acquisition S-3 33-52495 American Bankshares of Mankato acquisition S-3 33-58521 $1 billion shelf registration S-3 33-61667 Warrants for settlement of Edina Realty litigation S-3 33-62251 Southwest Holdings, Inc. acquisition S-3 333-01455 $1.5 billion universal shelf registration S-3 333-02983 Common shares for the Automatic Dividend Reinvestment and Common Stock Purchase Plan S-4 333-16991 $300 million Capital Securities /s/ Ernst & Young LLP Minneapolis, Minnesota February 25, 1997