The 1990 Portuguese Grand Prix was a Formula One motor race held on 23 September 1990 at Autódromo do Estoril. It was the thirteenth race of the 1990 FIA Formula One World Championship. It was scheduled to be held over 71 laps of the circuit but was stopped after 61 laps after an accident involving the Arrows of Alex Caffi and the Lola of Aguri Suzuki.

Nigel Mansell took pole position in his Ferrari and was leading when the race was stopped, thus taking his only victory of the season. Mansell finished 2.8 seconds ahead of Drivers' Championship leader Ayrton Senna in the McLaren-Honda, who in turn finished 1.3 seconds ahead of rival Alain Prost in the other Ferrari.

This also marked the first race in which an effective traction control system was used in Formula One. Scuderia Ferrari used the system on Prost's Ferrari 641; which gave the Frenchman an eventual third-place podium finish. Mansell's 641 was also equipped with the same traction control system; however, the Englishman decided to switch his system off for the race. Nonetheless, he still won the race.