The Alfa Romeo Tipo 33 was a sports racing prototype raced by the Alfa Romeo factory-backed team between 1967 and 1977. These cars took part for Sport Cars World Championship, Nordic Challenge Cup, Interserie and CanAm series. A small number of road going cars were derived from it in 1967, called Alfa Romeo 33 Stradale.

The 1975 World Sportscar Championship season was the 23rd season of FIA World Sportscar Championship motor racing. It featured the 1975 World Championship for Makes which was open to Group 5 Sports Cars and Group 4 Special GT Cars. It also included the FIA Cup for GT Cars and the FIA Cup for 2-Litre Cars. The three titles were contested concurrently over a nine race series which ran from 1 February to 12 July 1975.