The Ferrari 315 S was a sport racing car produced by Italian manufacturer Ferrari in 1957.

The model was intended to succeed the Ferrari 290 MM, which had won the 1956 Mille Miglia. The 315 S mounted a frontal V12 engine at 60°, with two valves per cylinder, for a total displacement of 3783,40 cm³. Maximum power was 360 HP at 7800 rpm, for a maximum speed of 290 km/h.

The Ferrari 315 S drivers grabbed the first two positions in the 1957 Mille Miglia, Piero Taruffi being the winner in his last race, followed by Wolfgang von Trips. The 315s did not score victories in the following races of the World Sportscar Championship (24 Hours of Le Mans and Nürburgring), although the retirement of the Maseratis in Venezuela granted Ferrari the overall victory.

The Ferrari 315 S was replaced by the 250 Testa Rossa

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