| 1991 Portuguese Grand Prix | |||
|---|---|---|---|
| Race 13 of 16 in the 1991 Formula One World Championship | |||
 | |||
| Race details | |||
| Date | 22 September 1991 | ||
| Official name | XXIII Grande Premio de Portugal | ||
| Location | Autódromo do Estoril | ||
| Course | Permanent racing facility | ||
| Course length | 4.350 km (2.703 miles) | ||
| Distance | 71 laps, 308.850 km (191.910 miles) | ||
| Weather | Sunny and warm | ||
| Pole position | |||
| Driver | Williams-Renault | ||
| Time | 1:13.001 | ||
| Fastest lap | |||
| Driver |
 Nigel Mansell | Williams-Renault | |
| Time | 1:18.179 on lap 43 | ||
| Podium | |||
| First | Williams-Renault | ||
| Second | McLaren-Honda | ||
| Third | Ferrari | ||
|
Lap leaders | |||
The 1991 Portuguese Grand Prix was a Formula One motor race held at the Autódromo do Estoril on 22 September 1991. It was the thirteenth race of the 1991 Formula One World Championship.
The 71-lap race was won by Italian driver Riccardo Patrese, driving a Williams-Renault, after he started from pole position. Patrese's teammate and Drivers' Championship challenger, Briton Nigel Mansell, led until a pit stop went wrong, resulting in his disqualification from the race. Brazilian Ayrton Senna finished second in a McLaren-Honda, thus increasing his lead over Mansell in the championship to 24 points with three races remaining, with Frenchman Jean Alesi finishing third in a Ferrari.