1990–91 USAC Championship Car season
The 1990–91 USAC Gold Crown Championship season consisted of one race, the 75th Indianapolis 500 on May 26, 1991. The USAC National Champion and Indianapolis 500 winner was Rick Mears. The schedule was based on a split-calendar, beginning in June 1990 and running through May 1991. Since USAC had dropped out of sanctioning Indy car races outside the Indy 500, the Gold Crown Championship consisted of only one event. The preeminent national championship season was instead sanctioned by CART.