The 1955 Italian Grand Prix was a Formula One motor race held at Autodromo Nazionale Monza, in Monza, Italy on 11 September 1955. It was the seventh and final round of the 1955 World Drivers' Championship.
In the wake of the 1955 Le Mans disaster, the championship was still open after the British Grand Prix; although after that race (with the French Grand Prix already having been cancelled) the German, Swiss and Spanish Grands Prix were all cancelled. This meant that Fangio won the world driver's championship for the 3rd time and the 2nd time in succession.
A new concrete banking had been constructed over where the original slightly banked version was, and the combined 10 km (6.214 mi) Monza circuit was used for the first time since 1933. The Curva Sud had also been modified from 2 right hand corners into one sweeping right-hander known as the "Parabolica".
Of the 4 factory Mercedes cars in the race, Fangio and Moss drove the streamlined, closed-wheel W196's, while Kling and Taruffi drove open-wheel W196's. This was the 4th and last appearance of the streamlined Mercedes cars at a championship GP.
This was the last Grand Prix race for 1950 world champion Nino Farina.