The 1946 Turin Grand Prix (formally known as the III Gran Premio del Valentino) was a Grand Prix motor race held on 1 September 1946 on a temporary street circuit at Valentino Park in Turin, Italy.

[4] All the cars that qualified for the race met the 1500cc supercharged specification except for Eugène Chaboud's Delahaye, which ran a 3500cc naturally-aspirated engine in the 4500cc class.

[4] Notes † – Alternative Driver, car originally entered by Louis Chiron Almost instantly after the start of the race, polesitter Farina experienced an irreparable transmission failure, while Whitehead managed to get into the lead before problems with his supercharger led to him dropping down the order.

Maserati's challenge was not aided by team leader Nuvolari, who, seeming to be suffering from suspension problems from the start, lost one of his rear wheels on lap 10.

Thankfully, he managed to bring the car to a stop without further incident, though the wheel itself ended up in the Po.

The race, typical for the time, was one of high attrition; half of the field had retired by the mid-point when the rain began.