The 1990 Belgian Grand Prix was a Formula One motor race held at Spa-Francorchamps on 26 August 1990. It was the eleventh race of the 1990 Formula One World Championship.

Brazilian driver Ayrton Senna claimed his fifth race victory for the season in his McLaren MP4/5B taking a four-second win over the Ferrari 641 driven the reigning world champion, Frenchman Alain Prost. Senna's Austrian team mate Gerhard Berger finished third, while further back Maurício Gugelmin scored a point for the Leyton House team.

Three attempts were made to start the race, the first two being red-flagged after collisions. Aguri Suzuki's Lola LC90 was eliminated after the first start, Paolo Barilla's Minardi M190 after the second.

Off-track, Nigel Mansell was rumoured to be reconsidering his prior announcement to retire, and he was strongly linked with Williams. He had demanded undisputed number one status as a driver, and various assurances from engine supplier Renault, which Frank Williams had told him were impossible. The Onyx team pulled out of Formula One before the weekend of the race, for financial reasons, having competed at this level for a season and a half.