The Douglas Circuit was a motor racing street circuit in Douglas, the capital and largest town of the Isle of Man and was re-configured each year until 1937.

[1] The first Grand Prix, titled "Mannin Beg & Mannin Moar" (English: Small Man & Big Man) was held in 1933 on a 4.60 mi (7.40 km) street circuit [2] which repeated as II and III Mannin Moar on different circuit layouts until 1935.

In 1936 the circuit changed again for the IV RAC International Light Car Race and a last time for the (1937) V RAC International Light Car Race.

Racing at Douglas resumed in post-war 1947 on the 1936 3.87 mi (6.23 km) circuit configuration[3] with the first Manx Cup and the 9th British Empire Trophy.

1933-1935: 1936-1937: 1947: 1947-1949: 1950: 1951-1953: Mannin Beg & Mannin Moar RAC International Light Car Race I Manx Cup British Empire Trophy British Empire Trophy British Empire Trophy Grand Prix Voiturette Voiturette Grand Prix Formula One Sports car