William John Long (18 June 1885 – 3 March 1957) was an Australian politician. Born in Newcastle, New South Wales, he received a primary education before becoming a boilermaker at the Eveleigh Railway Workshops for fifteen years and a member of the . He was the unsuccessful Labor candidate for Botany at the 1925 state election and for Nepean at the 1927 state election. He made a final bid for public office at the 1944 state election, when he unsuccessfully contested the Parramatta as an independent. He died in 1957.