The 2003 Trans-Am Series for the BFGoodrich Tires Cup was the 38th season of the Sports Car Club of America's Trans-Am Series. This year saw the series visit Puerto Rico for the first time; the first race since 1991 not in Canada or the United States. The Rookie of the Year was won by Jorge Diaz, Jr., the Owners Championship was won by the #7 Rocketsports Racing entry and the Manufacturers' Championship was won by Jaguar.