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- Dan O'Brien
- Sean O'Casey (1880–1964) (Ireland)
- bekky O'Neil (Canada)
- Eugene O'Neill (1888–1953)
- Gerlinde Obermeier
- Clifford Odets (1906–1963) (United States)
- Bolaji Odofin
- Han Ong
- Onyeka (England)
- Joe Orton (1933–1967) (England)
- John Osborne (1929–1994) (England)
- Peter Oswald
- Rochelle Owens
Read more about this topic: List Of Playwrights