Race Result
| GP n. 434 - 21/09/1986 - Grand Prix of Portugal Autodromo do Estoril |
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| Winner: | Nigel Mansell / Williams-Honda - 1:37'21.900 | ||||||
| Pole Position: | Ayrton Senna / Lotus-Renault - 1:16.673 | ||||||
| Fastest Lap: | Nigel Mansell / Williams-Honda - 1:20.943 | ||||||
| Pos | Nš | Driver | Constructor | Laps | Time/Retired | Grid | Points |
| 1 | 5 |  Nigel Mansell |
Williams-Honda | 70 | 1:37'21.900 | 2 | 9 |
| 2 | 1 |  Alain Prost |
McLaren-TAG | 70 | +18.772 | 3 | 6 |
| 3 | 6 |  Nelson Piquet |
Williams-Honda | 70 | +49.274 | 6 | 4 |
| 4 | 12 | Ayrton Senna |
Lotus-Renault | 69 | out of fuel | 1 | 3 |
| 5 | 27 |  Michele Alboreto |
Ferrari | 69 | + 1 lap | 13 | 2 |
| 6 | 28 |  Stefan Johansson |
Ferrari | 69 | + 1 lap | 8 | 1 |
| 7 | 25 | Rene Arnoux |
Ligier-Renault | 69 | + 1 lap | 10 | 0 |
| 8 | 19 | Teo Fabi |
Benetton-BMW | 68 | + 2 laps | 5 | 0 |
| 9 | 11 | Johnny Dumfries |
Lotus-Renault | 68 | + 2 laps | 15 | 0 |
| 10 | 18 |  Thierry Boutsen |
Arrows-BMW | 67 | + 3 laps | 21 | 0 |
| 11 | 17 |  Christian Danner |
Arrows-BMW | 67 | + 3 laps | 22 | 0 |
| 12 | 14 | Jonathan Palmer |
Zakspeed | 67 | + 3 laps | 20 | 0 |
| 13 | 22 |  Allen Berg |
Osella-Alfa Romeo | 63 | + 7 laps | 27 | 0 |
| Nc | 16 | Patrick Tambay |
Lola-Ford | 62 | not classified | 14 | 0 |
| Nc | 24 | Alessandro Nannini |
Minardi-Motori Moderni | 60 | not classified | 18 | 0 |
| Ret | 7 | Riccardo Patrese |
Brabham-BMW | 62 | engine | 9 | 0 |
| Ret | 20 |  Gerhard Berger |
Benetton-BMW | 44 | spun off | 4 | 0 |
| Ret | 23 | Andrea de Cesaris |
Minardi-Motori Moderni | 43 | spun off | 16 | 0 |
| Ret | 8 | Derek Warwick |
Brabham-BMW | 41 | electrical | 12 | 0 |
| Ret | 2 |  Keke Rosberg |
McLaren-TAG | 41 | electrical | 7 | 0 |
| Ret | 26 | Philippe Alliot |
Ligier-Renault | 39 | engine | 11 | 0 |
| Ret | 4 | Philippe Streiff |
Tyrrell-Renault | 28 | engine | 23 | 0 |
| Ret | 3 | Martin Brundle |
Tyrrell-Renault | 18 | engine | 19 | 0 |
| Ret | 15 |  Alan Jones |
Lola-Ford | 10 | spun off | 17 | 0 |
| Ret | 29 |  Huub Rothengatter |
Zakspeed | 9 | transmission | 26 | 0 |
| Ret | 21 | Piercarlo Ghinzani |
Osella-Alfa Romeo | 8 | engine | 24 | 0 |
| Ret | 31 | Ivan Capelli |
AGS-Motori Moderni | 6 | transmission | 25 | 0 |