- Orlean, Susan (15)
- O'Rourke, P.J.@
- O'Nan, Stewart@
- Ortiz, Roxannne Dunbar
 - Author of the memoir Red Dirt: Growing up Okie. - Ojakangas, Beatrice
- Author, chef, and columnist sharing biography, recipes, and information on her cookbook titles.
- Okwu, Julian C.R.
- Author and photographer of Face Forward: Young African American Men in a Critical Age. Site includes biographical information, press, and gallery.
- Orenstein, Peggy (1)
- Odzer, Cleo
- Author of Patpong Sisters, a non-fiction account of a red-light district in Bangkok.
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