The 1966 World Sportscar Championship season was the 14th season of the FIA "World Sportscar Championship" motor racing.[1] It featured the 1966 International Manufacturers' Championship and the 1966 International Sports Car Championship,[1] which were contested between 5 February 1966 and September 11, 1966, over a total of thirteen races.[2] The International Manufacturers' Championship was open to Group 6 Sports-Prototypes and was contested in two engine capacity divisions, P1 (Up to 2000cc) and P2 (Over 2000cc).[3] The International Sports Car Championship was open to Group 4 Sports Cars and was contested in three engine capacity divisions, S1 (Up to 1300cc), S2 (1301 to 2000cc) and S3 (Over 2000cc).[3]