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- Catherine O'Hara – comedic actress (SCTV, Beetlejuice, Best in Show)
- Mary Margaret O'Hara – singer/songwriter
- John "Peanuts" O'Flaherty – former NHL player
- Sidney Olcott – director
- Michael Ondaatje – writer (The English Patient)
- Kenneth Oppel – Author (Silverwing saga, Airborn trilogy
- Alexandra Orlando - gymnast
- Mark Osborne – former NHL player
- Our Lady Peace – rock band
- Seiji Ozawa – conductor
Read more about this topic: List Of People From Toronto
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