The Alfa Romeo Tipo 312, 312 or 12C-312 was a 3-litre formula racing car that was used in the 1938 Grand Prix season; drivers were Raymond Sommer, Giuseppe Farina, Eugenio Siena, Clemente Biondetti, Carlo Pintacuda, Jean-Pierre Wimille, Gianfranco Comotti, Piero Taruffi and Pietro Ghersi.

Alfa Romeo Tipo 312

Category	Grand Prix 3 litre
Constructor	Alfa Romeo
Designer(s)	Gioacchino Colombo
Production	1938
Technical specifications
Chassis	Aluminum tube chassis
Suspension (front)	independent, transverse leaf spring and two longitudinal guides
Suspension (rear)	independent, transverse leaf spring with hydraulic shock absorbers
Engine	Alfa Romeo 2995 cc V12 supercharged 320 hp (239 kW) @ 6500 rpm front engined, longitudinally mounted
Transmission	Alfa Four-speed Manual
Competition history
Notable entrants	Alfa Corse
Notable drivers	Raymond Sommer Giuseppe Farina Eugenio Siena Clemente Biondetti Carlo Pintacuda Jean-Pierre Wimille Gianfranco Comotti Piero Taruffi Pietro Ghersi
Debut	1938 Tripoli Grand Prix
Races Wins 18 0

Tipo 312 was one of three Alfa Romeo cars designed for the new rules in 1938, which differed mainly by the engine; the other two cars were the Alfa Romeo Tipo 308 with straight-8 engine and Alfa Romeo Tipo 316 with a V16 engine. The car was based on unsuccessful Alfa Romeo 12C-37; it was made easier to control than its predecessor. The engine in 312 is 3-litre 60° V-12 with roots supercharger, 2 valves/cyl, 2,995 cc (182.8 cu in) capacity 66 mm × 73 mm (2.60 in × 2.87 in) produced 320 bhp (239 kW) at 6500 rpm; it was more powerful than 308 but it was still not really competitive with German rivals.