The 1990 Portuguese Grand Prix was a Formula One motor race held on 23 September 1990 at Autódromo do Estoril. It was the thirteenth round of the 1990 Formula One season. The race was the 19th Portuguese Grand Prix and the seventh to be held at Estoril. It was held over 61 laps, of a scheduled 71 laps, of the four kilometre circuit for a race distance of 266 kilometres. The race was declared early after an accident involving Italian driver Alex Caffi in an Arrows A11B and Japanese driver Aguri Suzuki in a Lola LC90.