Authors starting with O
- Omar Vizquel
- O. M. Cabral
- O. M. Grey
- Omid Tofighian
- O. Muiriel Fuller
- Ona Caussa
- Ona Gritz
- Ondine LeBlanc
- Ondrea Barbe
- Ondrea Levine
- One
- O'Neil De Noux
- One R. Pagan
- Onkar Ghate
- Onobe, Melchizedec J.
- Opal Carew
- Opal Reyne
- Open Book Publishers
- Open Doors
- Open Doors With Brother Andrew
- Ophelia London
- Oprah Magazine Editors
- Oprah Winfrey
- Opta
- Orah Danḳner
- Oren Litwin
- O. R. Frisch
- Orhan Pamuk
- Ori Brafman
- Oriol Alamany
- Oriol Broggi Rull
- Oriol Hernández
- Oriol Ponsatí-Murlà
- Orion Carloto
- Orion Zangara
- Oristelle Bonis
- Orit Gidali
- Orked binti Ahmad (Datin)
- Orkid
- Orla Kiely
- Orlando Caicedo
- Orlando Echeverri Benedetti
- Orlando Figes
- Orpheus C. Kerr
- Orpheus Collar
- Orrin Grey
- Orr, John
- Orr Kelly
- Orson Scott Card
- Orson Welles
- Orville C. Walker
- Orville Vernon Burton
- Osahon Ize-Iyamu
- Osamah M. Al Muslim - أسامة المسلم
- Osamu Takahashi
- Osamu Tezuka
- Osbert Sitwell
- Osbert Stiwell
- Óscar Abalde Cantero
- Óscar Alonso Molina
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