Race Result
| GP n. 513 - 22/09/1991 - Grand Prix of Portugal Autodromo do Estoril |
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| Winner: | Riccardo Patrese / Williams-Renault - 1:35'42.304 | ||||||
| Pole Position: | Riccardo Patrese / Williams-Renault - 1:13.001 | ||||||
| Fastest Lap: | Nigel Mansell / Williams-Renault - 1:18.179 | ||||||
| Pos | Nš | Driver | Constructor | Laps | Time/Retired | Grid | Points |
| 1 | 6 |  Riccardo Patrese |
Williams-Renault | 71 | 1:35'42.304 | 1 | 10 |
| 2 | 1 |  Ayrton Senna |
McLaren-Honda | 71 | +20.941 | 3 | 6 |
| 3 | 28 |  Jean Alesi |
Ferrari | 71 | +53.554 | 6 | 4 |
| 4 | 23 | Pierluigi Martini |
Minardi-Ferrari | 71 | + 1'03.498 | 8 | 3 |
| 5 | 20 | Nelson Piquet |
Benetton-Ford | 71 | + 1'10.033 | 11 | 2 |
| 6 | 19 |  Michael Schumacher |
Benetton-Ford | 71 | + 1'16.582 | 10 | 1 |
| 7 | 15 | Mauricio Gugelmin |
Leyton House-Ilmor | 70 | + 1 lap | 7 | 0 |
| 8 | 33 | Andrea de Cesaris |
Jordan-Ford | 70 | + 1 lap | 14 | 0 |
| 9 | 24 | Gianni Morbidelli |
Minardi-Ferrari | 70 | + 1 lap | 13 | 0 |
| 10 | 32 | Roberto Moreno |
Jordan-Ford | 70 | +1 lap | 16 | 0 |
| 11 | 26 | Erik Comas |
Ligier-Lamborghini | 70 | + 1 lap | 23 | 0 |
| 12 | 7 |  Martin Brundle |
Brabham-Yamaha | 69 | + 2 laps | 19 | 0 |
| 13 | 3 |  Satoru Nakajima |
Tyrrell-Honda | 68 | + 3 laps | 21 | 0 |
| 14 | 11 |  Mika Hakkinen |
Lotus-Judd | 68 | + 3 laps | 26 | 0 |
| 15 | 9 | Michele Alboreto |
Footwork-Porsche | 68 | + 3 laps | 24 | 0 |
| 16 | 25 |  Thierry Boutsen |
Ligier-Lamborghini | 68 | + 3 lpas | 20 | 0 |
| 17 | 16 | Ivan Capelli |
Leyton House-Ilmor | 64 | spun off | 9 | 0 |
| Dsq | 5 | Nigel Mansell |
Williams-Renault | 51 | disqualified | 4 | 0 |
| Ret | 4 | Stefano Modena |
Tyrrell-Honda | 56 | engine | 12 | 0 |
| Ret | 30 | Aguri Suzuki |
Lola-Ford | 40 | transmission | 25 | 0 |
| Ret | 27 | Alain Prost |
Ferrari | 39 | engine | 5 | 0 |
| Ret | 2 |  Gerhard Berger |
McLaren-Honda | 37 | engine | 2 | 0 |
| Ret | 21 | Emanuele Pirro |
Dallara-Judd | 18 | engine | 17 | 0 |
| Ret | 22 | Jyrki Jarvi Lehto |
Dallara-Judd | 14 | gear box | 18 | 0 |
| Ret | 8 | Mark Blundell |
Brabham-Yamaha | 12 | suspension | 15 | 0 |
| Ret | 12 | Johnny Herbert |
Lotus-Judd | 1 | engine | 22 | 0 |
| Dnq | 17 | Gabriele Tarquini |
AGS-Ford | did not qualify | 0 | ||
| Dnq | 18 | Fabrizio Barbazza |
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 | 34 | Nicola Larini |
Lambo-Lamborghini | did not qualify | 0 | ||
| Dnq | 35 | Eric van de Poele |
Lambo-Lamborghini | did not qualify | 0 | ||
| Dnq | 29 | Eric Bernard |
Lola-Ford | did not qualify | 0 | ||