Race Result
| GP n. 512 - 08/09/1991 - Grand Prix of Italy Autodromo Nationale di Monza |
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| Winner: | Nigel Mansell / Williams-Renault - 1:17'54.319 | ||||||
| Pole Position: | Ayrton Senna / McLaren-Honda - 1:21.114 | ||||||
| Fastest Lap: | Ayrton Senna / McLaren-Honda - 1:26.061 | ||||||
| Pos | Nš | Driver | Constructor | Laps | Time/Retired | Grid | Points |
| 1 | 5 |  Nigel Mansell |
Williams-Renault | 53 | 1:17'54.319 | 2 | 10 |
| 2 | 1 |  Ayrton Senna |
McLaren-Honda | 53 | +16.262 | 1 | 6 |
| 3 | 27 |  Alain Prost |
Ferrari | 53 | +16.829 | 5 | 4 |
| 4 | 2 |  Gerhard Berger |
McLaren-Honda | 53 | +27.719 | 3 | 3 |
| 5 | 19 |  Michael Schumacher |
Benetton-Ford | 53 | +34.463 | 7 | 2 |
| 6 | 20 | Nelson Piquet |
Benetton-Ford | 53 | +45.600 | 8 | 1 |
| 7 | 33 |  Andrea de Cesaris |
Jordan-Ford | 53 | +51.136 | 14 | 0 |
| 8 | 16 | Ivan Capelli |
Leyton House-Ilmor | 53 | +1'15.019 | 12 | 0 |
| 9 | 24 | Gianni Morbidelli |
Minardi-Ferrari | 52 | + 1 lap | 17 | 0 |
| 10 | 21 | Emanuele Pirro |
Dallara-Judd | 52 | + 1 lap | 16 | 0 |
| 11 | 26 | Erik Comas |
Ligier-Lamborghini | 52 | + 1 lap | 22 | 0 |
| 12 | 8 | Mark Blundell |
Brabham-Yamaha | 52 | +1 lap | 11 | 0 |
| 13 | 7 | Martin Brundle |
Brabham-Yamaha | 52 | + 1 lap | 19 | 0 |
| 14 | 11 |  Mika Hakkinen |
Lotus-Judd | 49 | + 4 laps | 25 | 0 |
| 15 | 15 | Mauricio Gugelmin |
Leyton House-Ilmor | 49 | + 4 laps | 18 | 0 |
| 16 | 34 | Nicola Larini |
Lambo-Lamborghini | 48 | + 5 laps | 23 | 0 |
| Ret | 14 | Olivier Grouillard |
Fondmetal-Ford | 46 | engine | 26 | 0 |
| Ret | 22 | Jyrki Jarvi Lehto |
Dallara-Judd | 35 | overheating | 20 | 0 |
| Ret | 4 | Stefano Modena |
Tyrrell-Honda | 32 | engine | 13 | 0 |
| Ret | 28 | Jean Alesi |
Ferrari | 29 | engine | 6 | 0 |
| Ret | 6 | Riccardo Patrese |
Williams-Renault | 27 | gear box | 4 | 0 |
| Ret | 3 |  Satoru Nakajima |
Tyrrell-Honda | 24 | throttle | 15 | 0 |
| Ret | 29 | Eric Bernard |
Lola-Ford | 21 | engine | 24 | 0 |
| Ret | 23 | Pierluigi Martini |
Minardi-Ferrari | 8 | spun off | 10 | 0 |
| Ret | 32 | Roberto Moreno |
Jordan-Ford | 2 | spun off | 9 | 0 |
| Ret | 25 |  Thierry Boutsen |
Ligier-Lamborghini | 1 | spun off | 21 | 0 |
| Dnq | 17 | Gabriele Tarquini |
AGS-Ford | did not qualify | 0 | ||
| Dnq | 18 | Fabrizio Barbazza |
AGS-Ford | did not qualify | 0 | ||
| Dnq | 13 |  Pedro Chaves |
Coloni-Ford | did not qualify | 0 | ||
| Dnq | 9 | Michele Alboreto |
Footwork-Porsche | did not qualify | 0 | ||
| Dnq | 10 | Alex Caffi |
Footwork-Porsche | did not qualify | 0 | ||
| Dnq | 35 | Eric van de Poele |
Lambo-Lamborghini | did not qualify | 0 | ||
| Dnq | 30 | Aguri Suzuki |
Lola-Ford | did not qualify | 0 | ||
| Dnq | 12 | Michael Bartels |
Lotus-Judd | did not qualify | 0 | ||