The 1985 Italian Grand Prix was a Formula One motor race held at Monza on 8 September 1985.

It was Prost's fifth and final victory of the 1985 season as he powered towards the first of his four Formula One world championships.

Prost won by almost 52 seconds over the Brazilian duo Nelson Piquet (Brabham BT54) and Ayrton Senna (Lotus 97T).

Missing from the grid was popular West German driver Stefan Bellof who was killed a week earlier in a World Sportscar Championship race at the Spa Circuit in Belgium.

With his funeral set for the day after the Italian Grand Prix the Tyrrell team only ran the one car for Martin Brundle feeling it would be disrespectful to Bellof to bring a driver in to replace him for the race.