The 1968 USAC Championship Car season consisted of 28 races, beginning in Hanford, California on March 17 and concluding in Riverside, California on December 7. The USAC National Champion and Indianapolis 500 winner was Bobby Unser. Mike Spence died in an accident while practicing for the 1968 Indianapolis 500. Ronnie Duman died of burns suffered during the Rex Mays Classic.