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- Sinéad O'Connor, musician. She discussed her diagnosis in a Guardian interview in 2010.
- Graeme Obree, Scottish racing cyclist. World hour record 1993. Individual pursuit world champion in 1993 and 1995. Cited in 2003 autobiography, Flying Scotsman: Cycling to Triumph Through My Darkest Hours and 2006 film.
- Phil Ochs, musician.
- Bill Oddie, naturalist, comedian and television presenter.
- Cheri Oteri, actress. Saturday Night Live Cast Member. Cited in Shales T.& Miller A. (2002) Live From New York, A Uncensored History of Saturday Night Live.
- Craig Owens, singer for American bands Chiodos, and Destroy Rebuild Until God Shows.
Read more about this topic: List Of People With Bipolar Disorder