Bonar Stewart Bain (February 4, 1923 – February 18, 2005) was a Canadian actor and the identical twin brother of actor Conrad Bain, who starred in the television sitcom Diff'rent Strokes as Phillip Drummond and Maude as Arthur Harmon. He once played a fictional "evil” twin to Conrad ("Hank Bain”) in an episode of SCTV, as well as Arthur (Conrad Bain)'s twin brother Arnold on Maude.