Race Result
| GP n. 504 - 12/05/1991 - Grand Prix of Monaco Circuit de Monte Carlo |
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| Winner: | Ayrton Senna / McLaren-Honda - 1:53'02.334 | ||||||
| Pole Position: | Ayrton Senna / McLaren-Honda - 1:20.344 | ||||||
| Fastest Lap: | Alain Prost / Ferrari - 1:24.360 | ||||||
| Pos | Nš | Driver | Constructor | Laps | Time/Retired | Grid | Points |
| 1 | 1 |  Ayrton Senna |
McLaren-Honda | 78 | 1:53'02.334 | 1 | 10 |
| 2 | 5 |  Nigel Mansell |
Williams-Renault | 78 | +18.348 | 5 | 6 |
| 3 | 28 |  Jean Alesi |
Ferrari | 78 | +47.455 | 9 | 4 |
| 4 | 19 | Roberto Moreno |
Benetton-Ford | 77 | + 1 lap | 8 | 3 |
| 5 | 27 | Alain Prost |
Ferrari | 77 | + 1 lap | 7 | 2 |
| 6 | 21 |  Emanuele Pirro |
Dallara-Judd | 77 | + 1 lap | 12 | 1 |
| 7 | 25 |  Thierry Boutsen |
Ligier-Lamborghini | 76 | + 2 laps | 16 | 0 |
| 8 | 32 | Bertrand Gachot |
Jordan-Ford | 76 | + 2 laps | 24 | 0 |
| 9 | 29 | Eric Bernard |
Lola-Ford | 76 | + 2 laps | 21 | 0 |
| 10 | 26 | Erik Comas |
Ligier-Lamborghini | 76 | +2 laps | 23 | 0 |
| 11 | 22 |  Jyrki Jarvi Lehto |
Dallara-Judd | 75 | + 3 laps | 13 | 0 |
| 12 | 23 | Pierluigi Martini |
Minardi-Ferrari | 72 | + 6 laps | 14 | 0 |
| Ret | 11 | Mika Hakkinen |
Lotus-Judd | 64 | oil leak | 26 | 0 |
| Ret | 24 | Gianni Morbidelli |
Minardi-Ferrari | 49 | gear box | 17 | 0 |
| Ret | 15 | Mauricio Gugelmin |
Leyton House-Ilmor | 43 | throttle | 15 | 0 |
| Ret | 4 | Stefano Modena |
Tyrrell-Honda | 42 | engine | 2 | 0 |
| Ret | 6 | Riccardo Patrese |
Williams-Renault | 42 | spun off | 3 | 0 |
| Ret | 8 | Mark Blundell |
Brabham-Yamaha | 41 | spun off | 22 | 0 |
| Ret | 9 | Michele Alboreto |
Footwork-Porsche | 39 | engine | 25 | 0 |
| Ret | 3 |  Satoru Nakajima |
Tyrrell-Honda | 35 | spun off | 11 | 0 |
| Ret | 30 | Aguri Suzuki |
Lola-Ford | 24 | spun off | 19 | 0 |
| Ret | 33 | Andrea de Cesaris |
Jordan-Ford | 21 | throttle | 10 | 0 |
| Ret | 16 | Ivan Capelli |
Leyton House-Ilmor | 12 | brakes | 18 | 0 |
| Ret | 17 | Gabriele Tarquini |
AGS-Ford | 9 | gearbox | 20 | 0 |
| Ret | 2 |  Gerhard Berger |
McLaren-Honda | 9 | spun off | 6 | 0 |
| Ret | 20 | Nelson Piquet |
Benetton-Ford | 0 | suspension | 4 | 0 |
| Dnq | 18 | Fabrizio Barbazza |
AGS-Ford | did not qualify | 0 | ||
| Dnq | 7 | Martin Brundle |
Brabham-Yamaha | did not qualify | 0 | ||
| Dnq | 13 |  Pedro Chaves |
Coloni-Ford | did not qualify | 0 | ||
| Dnq | 14 | Olivier Grouillard |
Fondmetal-Ford | did not qualify | 0 | ||
| Dnq | 10 | Alex Caffi |
Footwork-Porsche | did not qualify | 0 | ||
| Dnq | 34 | Nicola Larini |
Lambo-Lamborghini | did not qualify | 0 | ||
| Dnq | 35 | Eric van de Poele |
Lambo-Lamborghini | did not qualify | 0 | ||
| Dnq | 12 | Julian Bailey |
Lotus-Judd | did not qualify | 0 | ||