Race Result
| GP n. 501 - 10/03/1991 - Grand Prix of the United States Phoenix |
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| Winner: | Ayrton Senna / McLaren-Honda - 2:00'47.828 | ||||||
| Pole Position: | Ayrton Senna / McLaren-Honda - 1:21.434 | ||||||
| Fastest Lap: | Jean Alesi / Ferrari - 1:26.758 | ||||||
| Pos | Nš | Driver | Constructor | Laps | Time/Retired | Grid | Points |
| 1 | 1 |  Ayrton Senna |
McLaren-Honda | 81 | 2:00'47.828 | 1 | 10 |
| 2 | 27 |  Alain Prost |
Ferrari | 81 | +16.322 | 2 | 6 |
| 3 | 20 | Nelson Piquet |
Benetton-Ford | 81 | +17.376 | 5 | 4 |
| 4 | 4 |  Stefano Modena |
Tyrrell-Honda | 81 | +25.409 | 11 | 3 |
| 5 | 3 |  Satoru Nakajima |
Tyrrell-Honda | 80 | + 1 lap | 16 | 2 |
| 6 | 30 | Aguri Suzuki |
Lola-Ford | 79 | + 2 laps | 21 | 1 |
| 7 | 34 | Nicola Larini |
Lambo-Lamborghini | 78 | +3 laps | 17 | 0 |
| 8 | 17 | Gabriele Tarquini |
AGS-Ford | 77 | + 4 laps | 22 | 0 |
| 9 | 23 | Pierluigi Martini |
Minardi-Ferrari | 75 | engine | 15 | 0 |
| 10 | 32 |  Bertrand Gachot |
Jordan-Ford | 75 | engine | 14 | 0 |
| 11 | 7 |  Martin Brundle |
Brabham-Yamaha | 73 | + 8 laps | 12 | 0 |
| 12 | 28 | Jean Alesi |
Ferrari | 72 | gear box | 6 | 0 |
| 13 | 11 |  Mika Hakkinen |
Lotus-Judd | 59 | engine | 13 | 0 |
| Ret | 19 | Roberto Moreno |
Benetton-Ford | 49 | collision | 8 | 0 |
| Ret | 6 | Riccardo Patrese |
Williams-Renault | 49 | gear box | 3 | 0 |
| Ret | 9 | Michele Alboreto |
Footwork-Porsche | 41 | engine | 25 | 0 |
| Ret | 16 | Ivan Capelli |
Leyton House-Ilmor | 40 | gear box | 18 | 0 |
| Ret | 25 | Thierry Boutsen |
Ligier-Lamborghini | 40 | engine | 20 | 0 |
| Ret | 2 |  Gerhard Berger |
McLaren-Honda | 36 | fuel pump | 7 | 0 |
| Ret | 5 | Nigel Mansell |
Williams-Renault | 35 | gear box | 4 | 0 |
| Ret | 15 | Mauricio Gugelmin |
Leyton House-Ilmor | 34 | gear box | 23 | 0 |
| Ret | 8 | Mark Blundell |
Brabham-Yamaha | 32 | spun off | 24 | 0 |
| Ret | 21 | Emanuele Pirro |
Dallara-Judd | 16 | gear box | 9 | 0 |
| Ret | 24 | Gianni Morbidelli |
Minardi-Ferrari | 15 | gear box | 26 | 0 |
| Ret | 22 | Jyrki Jarvi Lehto |
Dallara-Judd | 12 | gear box | 10 | 0 |
| Ret | 29 | Eric Bernard |
Lola-Ford | 4 | engine | 19 | 0 |
| Dnq | 18 |  Stefan Johansson |
AGS-Ford | 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 | 33 | Andrea de Cesaris |
Jordan-Ford | did not qualify | 0 | ||
| Dnq | 35 | Eric van de Poele |
Lambo-Lamborghini | did not qualify | 0 | ||
| Dnq | 26 | Erik Comas |
Ligier-Lamborghini | did not qualify | 0 | ||
| Dnq | 12 | Julian Bailey |
Lotus-Judd | did not qualify | 0 | ||