Gran Premio de Mónaco 1991
Ronda 4 de la temporada 1991 de Fórmula 1, disputada el 12 de mayo de 1991.
Circuito: Circuit de Monaco
Ayrton Senna ganó con McLaren. Pole: Ayrton Senna.
Clasificación final
| Pos. | Piloto | Equipo | Parrilla | Vueltas | Tiempo | Puntos |
|---|---|---|---|---|---|---|
| 1 | Ayrton Senna | McLaren | 1 | 78 | 1:53:02.334 | 10 |
| 2 | Nigel Mansell | Williams | 5 | 78 | +18.348 | 6 |
| 3 | Jean Alesi | Ferrari | 9 | 78 | +47.455 | 4 |
| 4 | Roberto Moreno | Benetton | 8 | 77 | +1 Lap | 3 |
| 5 | Alain Prost | Ferrari | 7 | 77 | +1 Lap | 2 |
| 6 | Emanuele Pirro | Dallara | 12 | 77 | +1 Lap | 1 |
| 7 | Thierry Boutsen | Ligier | 16 | 76 | +2 Laps | 0 |
| 8 | Bertrand Gachot | Jordan | 23 | 76 | +2 Laps | 0 |
| 9 | Éric Bernard | Lola | 13 | 76 | +2 Laps | 0 |
| 10 | Érik Comas | Ligier | 26 | 76 | +2 Laps | 0 |
| 11 | Jyrki Järvilehto | Dallara | 21 | 75 | +3 Laps | 0 |
| 12 | Pierluigi Martini | Minardi | 14 | 72 | +6 Laps | 0 |
| R | Mika Häkkinen | Team Lotus | 25 | 64 | Oil leak | 0 |
| R | Gianni Morbidelli | Minardi | 17 | 49 | Gearbox | 0 |
| R | Maurício Gugelmin | Leyton House | 15 | 43 | Throttle | 0 |
| R | Stefano Modena | Tyrrell | 2 | 42 | Engine | 0 |
| R | Riccardo Patrese | Williams | 3 | 42 | Spun off | 0 |
| R | Mark Blundell | Brabham | 19 | 41 | Spun off | 0 |
| R | Michele Alboreto | Footwork | 22 | 39 | Engine | 0 |
| R | Satoru Nakajima | Tyrrell | 11 | 35 | Spun off | 0 |
| R | Aguri Suzuki | Lola | 20 | 24 | Engine | 0 |
| R | Andrea de Cesaris | Jordan | 10 | 21 | Throttle | 0 |
| R | Ivan Capelli | Leyton House | 18 | 12 | Brakes | 0 |
| R | Gabriele Tarquini | AGS | 24 | 9 | Gearbox | 0 |
| R | Gerhard Berger | McLaren | 6 | 9 | Spun off | 0 |
| R | Nelson Piquet | Benetton | 4 | 0 | Suspension | 0 |
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