The 1915 AAA Championship Car season consisted of 27 races, beginning in San Diego, California on January 9 and concluding in San Francisco, California on November 25.

The de facto National Champion as polled by the American automobile journal Motor Age, was Earl Cooper.

Points were not awarded by the AAA Contest Board during the 1915 season.

Cooper was named the champion by Chris G. Sinsabaugh, an editor at Motor Age, based upon merit and on track performance.

At a later point, it was recognized by historians that these championship results should be considered unofficial.