Circuit de Monaco · 12 May 1991
Ayrton Senna won the 1991 Monaco Grand Prix for McLaren from 1st on the grid, 18.348s ahead of Nigel Mansell. Bertrand Gachot gained the most places, from 24th on the grid to 8th.
| Pos | Team | Points Breakdown | Pts | |
|---|---|---|---|---|
| 1 | McLaren Senna 10 + Berger 0 | Senna 10 + Berger 0 | 10 | |
| 2 | Williams Mansell 6 + Patrese 0 | Mansell 6 + Patrese 0 | 6 | |
| 3 | Ferrari Alesi 4 + Prost 2 | Alesi 4 + Prost 2 | 6 | |
| 4 | Benetton Moreno 3 + Piquet 0 | Moreno 3 + Piquet 0 | 3 | |
| 5 | Dallara Pirro 1 + Järvilehto 0 | Pirro 1 + Järvilehto 0 | 1 | |
| 6 | Ligier Boutsen 0 + Comas 0 | Boutsen 0 + Comas 0 | 0 | |
| 7 | Jordan Gachot 0 + de Cesaris 0 | Gachot 0 + de Cesaris 0 | 0 | |
| 8 | Lola Bernard 0 + Suzuki 0 | Bernard 0 + Suzuki 0 | 0 | |
| 9 | Minardi Martini 0 + Morbidelli 0 | Martini 0 + Morbidelli 0 | 0 | |
| 10 | Team Lotus Häkkinen 0 | Häkkinen 0 | 0 | |
| 11 | Leyton House Gugelmin 0 + Capelli 0 | Gugelmin 0 + Capelli 0 | 0 | |
| 12 | Tyrrell Modena 0 + Nakajima 0 | Modena 0 + Nakajima 0 | 0 | |
| 13 | Brabham Blundell 0 | Blundell 0 | 0 | |
| 14 | Footwork Alboreto 0 | Alboreto 0 | 0 | |
| 15 | AGS Tarquini 0 | Tarquini 0 | 0 |
| Pos | Driver | Team | Race time / Gap | Laps | Stops | Pts | |
|---|---|---|---|---|---|---|---|
| 1 | Ayrton Senna McLaren | McLaren | 1:53:02.334 | 78 | — | 10 | |
| 2 | Nigel Mansell Williams | Williams | +18.348s | 78 | — | 6 | |
| 3 | Jean Alesi Ferrari | Ferrari | +47.455s | 78 | — | 4 | |
| 4 | Roberto Moreno Benetton | Benetton | +1 Lap | 77 | — | 3 | |
| 5 | Alain Prost Ferrari | Ferrari | +1 Lap | 77 | — | 2 | |
| 6 | Emanuele Pirro Dallara | Dallara | +1 Lap | 77 | — | 1 | |
| 7 | Thierry Boutsen Ligier | Ligier | +2 Laps | 76 | — | — | |
| 8 | Bertrand Gachot Jordan | Jordan | +2 Laps | 76 | — | — | |
| 9 | Éric Bernard Lola | Lola | +2 Laps | 76 | — | — | |
| 10 | Érik Comas Ligier | Ligier | +2 Laps | 76 | — | — | |
| 11 | Jyrki Järvilehto Dallara | Dallara | +3 Laps | 75 | — | — | |
| 12 | Pierluigi Martini Minardi | Minardi | +6 Laps | 72 | — | — | |
| DNF | Mika Häkkinen Team Lotus | Team Lotus | DNF Oil leak | 64 | — | — | |
| DNF | Gianni Morbidelli Minardi | Minardi | DNF Gearbox | 49 | — | — | |
| DNF | Maurício Gugelmin Leyton House | Leyton House | DNF Throttle | 43 | — | — | |
| DNF | Stefano Modena Tyrrell | Tyrrell | DNF Engine | 42 | — | — | |
| DNF | Riccardo Patrese Williams | Williams | DNF Spun off | 42 | — | — | |
| DNF | Mark Blundell Brabham | Brabham | DNF Spun off | 41 | — | — | |
| DNF | Michele Alboreto Footwork | Footwork | DNF Engine | 39 | — | — | |
| DNF | Satoru Nakajima Tyrrell | Tyrrell | DNF Spun off | 35 | — | — | |
| DNF | Aguri Suzuki Lola | Lola | DNF Engine | 24 | — | — | |
| DNF | Andrea de Cesaris Jordan | Jordan | DNF Throttle | 21 | — | — | |
| DNF | Ivan Capelli Leyton House | Leyton House | DNF Brakes | 12 | — | — | |
| DNF | Gabriele Tarquini AGS | AGS | DNF Gearbox | 9 | — | — | |
| DNF | Gerhard Berger McLaren | McLaren | DNF Spun off | 9 | — | — | |
| DNF | Nelson Piquet Benetton | Benetton | DNF Suspension | 0 | — | — |