The 1987 Italian Grand Prix was a Formula One motor race held at Monza on 6 September 1987. It was the eleventh race of the 1987 Formula One World Championship.

The race was won from pole position by Brazilian driver Nelson Piquet, driving a Williams-Honda. Piquet took his third victory of the season by 1.8 seconds from compatriot Ayrton Senna, who led in his Lotus-Honda before running wide at the Parabolica with eight laps to go. Piquet's British team-mate, Nigel Mansell, finished third, nearly 50 seconds adrift. It was also the sixth consecutive victory for the Williams team, a run of wins that had begun at the French Grand Prix in early July.

During qualifying, Piquet recorded a speed of 352.135 km/h (218.807 mph), the fastest achieved by a Formula One car during the first turbo era of the sport (1977-88).