The 1966 Trans-American Sedan Championship was the inaugural running of the Sports Car Club of America's Trans-Am Series auto racing series. It was open to FIA Group 1 and FIA Group 2 cars and was contested over seven races.[1] Manufacturers titles were awarded for both Over 2 Liter and Under 2 Liter cars with Ford and Alfa Romeo winning their respective class championships.[1] Horst Kwech and Gaston Andrey were subsequently named Drivers co-champions in 1980 when the SCCA retroactively named drivers championships for the series after the 1980 season.