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. He also portrayed Arthur's (Conrad Bain) twin brother Arnold on Maude. He was born in Lethbridge, Alberta.