The 1990 World Sportscar Championship season was the 38th season of FIA World Sportscar Championship racing. It featured the 1990 FIA World Sports-Prototype Championship for Drivers and the 1990 FIA World Sports-Prototype Championship for Teams, both of which were contested over a series for cars running under the FIA's Group C formula. The series ran from 8 April 1990 to 7 October 1990 and was composed of nine races.
The Montreal race was stopped before 75% distance was completed, therefore half points were awarded.
In order to be classified for points, a team had to complete 75% of the winner's distance. Further, drivers were required to complete at least 30% of their car's total race distance to qualify for championship points.
1990 24 Hours of Le Mans, a race for Group C Sports Prototypes which did not count towards the 1990 World Sports-Prototype Championship.