William James Douglas Allum (October 9, 1916 – March 14, 1992) was a Canadian ice hockey defenceman and coach. He played one game in the National Hockey League, with the New York Rangers on November 16, 1940. The rest of his career, which lasted from 1937 to 1953, was spent in minor and senior leagues. He later coached the 1959 Memorial Cup-winning Winnipeg Braves.