The 1971 Trans-American Championship was the sixth running of the Sports Car Club of America's Trans-Am Series. The format was altered to an over 2500cc class and an under 2500cc class, up 500cc from past years. All races used split classes except where noted. The year marked the rise of Datsun as a competitive brand, with the Japanese company winning several races throughout the season. American Motors, led by Mark Donohue's 7 wins, and Datsun, led by John Morton's 6 wins, won the manufacturers' championships.