Gerald William Mahoney (24 May 1892 – 16 September 1955) was an Australian politician. Born in Tasmania, he was educated in that state at Latrobe, becoming a painter and an official of the Painters' Union. In 1931 he was elected to the Tasmanian House of Assembly as a Labor member for Denison. In 1934, he transferred to federal politics, defeating United Australia Party MP Arthur Hutchin for the federal seat of Denison. He held the seat until his defeat by UAP candidate Arthur Beck in 1940.