Don McKellar CM (born August 17, 1963) is a Canadian actor, writer, playwright, and filmmaker. He was part of a loosely-affiliated group of filmmakers to emerge from Toronto known as the Toronto New Wave.

He is known for directing and writing the film Last Night, which won the Prix de la Jeunesse at the 1998 Cannes Film Festival, as well as his screenplays for films such as Thirty Two Short Films About Glenn Gould, The Red Violin, and Blindness. McKellar frequently acts in his own projects, and has also appeared in Atom Egoyan's Exotica and David Cronenberg's eXistenZ and Crimes of the Future.

He is also known for being a fixture on Canadian television, with series including Twitch City, Odd Job Jack, and Slings & Arrows, as well as writing the book for the popular Tony Award-winning musical The Drowsy Chaperone. He is an eight-time nominee and two-time Genie Award winner.

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