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- Patrick O'Connell (1944–2005)
- Sheree-Lee Olson, novelist, poet and journalist
- Michael Ondaatje (born 1943), Sri Lankan novelist and poet with Canadian citizenship
- Heather O'Neill, novelist, poet, short story writer, screenwriter and journalist
- Madeleine Ouellette-Michalska (born 1930), French-Canadian writer, novelist, essayist and poet
- Richard Outram (1930–2005), poet and writer; co-founder, with his wife, Barbara Howard, of The Gauntlet Press
Read more about this topic: List Of Canadian Poets