William Mowbray Longley (11 November 1911 in Dandenong, Victoria – 15 April 2005) was an Australian international speedway rider.

Longley noted as being only 5 ft 1 inch in height, began his British career with the New Cross Rangers in 1937,[1][2] where he remained until the outbreak of World War II, winning the National League Championship in 1938.

[3][4] In 1946 he rode for Odsal but returned to New Cross in 1947 and was again a member of the team that won the 1948 National League Championship.

[2] Longley finished ninth in the Speedway World Championship in 1949[5] and remained with New Cross until they closed in 1953.

He joined Bradford for a short spell with the Tudors before returning to London with the Wimbledon Dons.