1991 Grand Prix of Monaco
12 May - Monte Carlo: 259.584km (3.328km x 78 laps)


Pole Position: Ayrton Senna, McLaren-Honda MP4/6, 1:20.344


Results
 1. Ayrton Senna           McLaren-Honda MP4/6           1:53:02.334 (137.785 km/h)
 2. Nigel Mansell          Williams-Renault FW14        -     18.348
 3. Jean Alesi             Ferrari 642                  -     47.455
 4. Roberto Moreno         Benetton-Ford B191           -  1 lap
 5. Alain Prost            Ferrari 642                  -  1 lap
 6. Emanuele Pirro         Dallara-Judd 191             -  1 lap
 7. Thierry Boutsen        Ligier-Lamborghini JS35      -  2 laps
 8. Bertrand Gachot        Jordan-Ford 191              -  2 laps
 9. Eric Bernard           Lola-Ford L91                -  2 laps
10. Erik Comas             Ligier-Lamborghini JS35      -  2 laps
11. J.J. Lehto             Dallara-Judd 191             -  3 laps
12. Pierluigi Martini      Minardi-Ferrari M191         -  6 laps
    
Fastest lap: Alain Prost, 1:24.368 (142.006 km/h on lap 77)
    

Retirements    
    Mika Häkkinen          Lotus-Judd 102B              - 14 laps (Oil leak/Fire)
    Gianni Morbidelli      Minardi-Ferrari M191         - 29 laps (Gearbox)
    Mauricio Gugelmin      Leyton House-Ilmor CG911     - 35 laps (Throttle)
    Stefano Modena         Tyrrell-Honda 020            - 36 laps (Engine)
    Riccardo Patrese       Williams-Renault FW14        - 36 laps (Spun)
    Mark Blundell          Brabham-Yamaha BT60Y         - 37 laps (Spun)
    Michele Alboreto       Footwork-Porsche FA12        - 39 laps (Engine)
    Satoru Nakajima        Tyrrell-Honda 020            - 43 laps (Spun)
    Aguri Suzuki           Lola-Ford L91                - 54 laps (Brakes/Accident)
    Andrea de Cesaris      Jordan-Ford 191              - 57 laps (Throttle)
    Ivan Capelli           Leyton House-Ilmor CG911     - 66 laps (Brakes)
    Gabriele Tarquini      AGS-Ford JH25                - 69 laps (Gearbox)
    Gerhard Berger         McLaren-Honda MP4/6          - 69 laps (Spun)
    Nelson Piquet          Benetton-Ford B191           - 78 laps (Accident/Suspension)
    
Did Not Qualify    
    Julian Bailey          Lotus-Judd 102B
    Fabrizio Barbazza      AGS-Ford JH25
    Alex Caffi             Footwork-Porsche FA12         No time (Accident/Injury)
    Martin Brundle         Brabham-Yamaha BT60Y          Excluded (Missed weight check)
    
Did Not Pre-qualify    
    Nicola Larini          Lamborghini 291
    Eric van de Poele      Lamborghini 291
    Pedro Chaves           Coloni-Ford C4
    Olivier Grouillard     Fomet-Ford F1


    Race leaders:
    Ayrton Senna           1-78 (78 laps = 259.584 km)
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                                Starting Grid

 1. Ayrton Senna           McLaren-Honda MP4/6           1:20.344 (149.119 km/h)
 2. Stefano Modena         Tyrrell-Honda 020            -   0.465
 3. Riccardo Patrese       Williams-Renault FW14        -   0.629
 4. Nelson Piquet          Benetton-Ford B191           -   0.815
 5. Nigel Mansell          Williams-Renault FW14        -   0.861
 6. Gerhard Berger         McLaren-Honda MP4/6          -   0.878
 7. Alain Prost            Ferrari 642                  -   1.111
 8. Roberto Moreno         Benetton-Ford B191           -   1.460
 9. Jean Alesi             Ferrari 642                  -   1.566
10. Andrea de Cesaris      Jordan-Ford 191              -   2.420
11. Satoru Nakajima        Tyrrell-Honda 020            -   2.628
12. Emanuele Pirro         Dallara-Judd 191             -   2.678
13. J.J. Lehto             Dallara-Judd 191             -   2.679
14. Pierluigi Martini      Minardi-Ferrari M191         -   2.720
15. Mauricio Gugelmin      Leyton House-Ilmor CG911     -   3.050
16. Thierry Boutsen        Ligier-Lamborghini JS35      -   3.087
17. Gianni Morbidelli      Minardi-Ferrari M191         -   3.240
18. Ivan Capelli           Leyton House-Ilmor CG911     -   3.298
19. Aguri Suzuki           Lola-Ford L91                -   3.554
20. Gabriele Tarquini      AGS-Ford JH25                -   3.565
21. Eric Bernard           Lola-Ford L91                -   3.735
22. Mark Blundell          Brabham-Yamaha BT60Y         -   3.765
23. Erik Comas             Ligier-Lamborghini JS35      -   3.807
24. Bertrand Gachot        Jordan-Ford 191              -   3.864
25. Michele Alboreto       Footwork-Porsche FA12        -   4.262
26. Mika Häkkinen          Lotus-Judd 102B              -   4.485

Did Not Qualify
27. Julian Bailey          Lotus-Judd 102B              -   6.651
28. Fabrizio Barbazza      AGS-Ford JH25                -   6.735
29. Alex Caffi             Footwork-Porsche FA12         No time (Accident/Injury)
30. Martin Brundle         Brabham-Yamaha BT60Y          Excluded (Missed weight check)

Did Not Pre-qualify
31. Nicola Larini          Lamborghini 291              -   5.549
32. Eric van de Poele      Lamborghini 291              -   5.938
33. Pedro Chaves           Coloni-Ford C4               -   7.045
34. Olivier Grouillard     Fomet-Ford F1                -   7.415