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Malcolm Arthur Colston (5 April 1938 – 23 August 2003) was an Australian politician who served as a Senator for Queensland from 1975 to 1999. He was a member of the Labor Party until 1996, when he resigned to sit as an independent following a dispute over his candidacy for Deputy President of the Senate. Colston was a schoolteacher before entering politics, and held a doctorate in educational psychology from the University of Queensland.