| O'Bryan, Pat | | Acid Southwestern art is about cactus swaying in the breeze, adobe churches swirling through the desert, nuns on peyote, and seeing the world in a different way. |
| O'Donovan, Colin | | Includes friends, interests, a Curriculum Vitae, and television. |
| O'Grady, Ted | | Ted O'Grady is an Agile Team Lead and Software Developer. Site includes thoughts on writing good code, a blog, and a resume. |
| O'Hagan, Mike - Home on W3 | | Free resources for self development, all about the Clan O'Hagan including a free clan forum, his art achievements and things for sale. |
| O'Hara, Robert J. | | Evolutionary biology and the historical sciences, residential colleges and higher education reform, and New England genealogy. |
| O'Hara, Ryan | | Musical interests, biography, photographs, and links. |
| O'Hare, Ian | | Information about Ian, computer games, TV shows, and F1 race car driving. |
| O'Hern, Tom | | What he's doing, where he can be found, what he thinks is interesting in the world. |
| O'Leary, Dan K. | | Dating advice and tips, requests to buy him beer, and/or apply for a date. |
| O'Neil, Dara | | Research faculty member at Georgia Tech and Ph.D. student in Information and Telecommunications Policy. Biography, projects and travel photos. |
| O'Reilly, Kevin | | A personal view of the history behind the O'Reilly family name, the history of the Staffordshire Potteries, and some personal details. |
| O'Riordan, Ciaran | | A software freedom and GNU project supporter, active in building awareness and understanding of free software and in campaigns against software patents. |
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