The 1966 World Sportscar Championship season was the 14th season of the FIA World Sportscar Championship. It was a series for Sportscars and Grand Touring, with Sportscars being divided into Sports (S) and Prototype (P) classes, while Grand Touring cars were referred to simply as GT. It ran from February 5, 1966 to September 11, 1966, and was comprised of 13 races.