ATS (Automobili Turismo e Sport) was an Italian automotive constructor and racing team that operated between 1963 and 1965, formed after the famous "Palace Revolution" at Ferrari.
The company was formed by Carlo Chiti and Giotto Bizzarrini, among others – intending for it to be a direct competitor to Ferrari both on the race track and on the street. Chiti and Bizzarrini built, with sponsorship from the Scuderia Serenissima's Count Giovanni Volpi, a road-going sports car and a Formula One racing car.
The sports car was the ATS 2500 GT, a small coupé developed by Chiti and Bizzarrini with a Franco Scaglione-designed bodywork built by Allemano. The engine was a mid-mounted 2.5 L V8 engineered by Chiti, capable of achieving 245 hp (180 kW) and accelerating to 257 km/h (160 mph). Only 12 cars were reportedly built, and few exist today. Apart from being one of the first mid-engine sports cars (the René-Bonnet Djet in France is said to have beaten it to the market by a few months), 2500 GT never gained fame or popularity, but its 90 degree DOHC V8 with a flatplane crankshaft was later developed into Alfa Romeo Tipo 33 engine in 2 L, 2.5 L and 3 L formats by Carlo Chiti at Autodelta.