| O'Connell | | Richard, Nicola, Veronica and Patrick (Goa, India). Photos, music, animations, newsletters, and stories. [shockwave flash required] |
| O'Gorman | | Ian, Lauren, Nico (Bern, Switzerland). Links, pictures, news, phone, address, email. |
| O'Hanlon | | Mark, Sue & James (Hesketh Bank, West Lancashire, UK) share photos and news. |
| O'Hara, Joe and Sue | | Information and photos of family, friends and greyhounds. Includes links to Sue's sculpture and Joe's business. |
| O'Neal | | Richard Alan O'Neal Jr shares family Genealogy 400 AD to present as well as history, links, photos. |
| O'Neal | | Patrick, family and friends. About, Interests, Favorites, Photos, Feedback. |
| O'Neil | | Online directory to members of the O'Neil Family. |
| O'Neil | | A large family (Geelong, Australia) shares pictures of weddings, parties, children's activities, travel and everyday life. |
| O'Nuska | | Matt and Cindy (Albuquerque, New Mexico, USA). Pictures. |
| O'Regan | | Declan and Jodie's website includes some O'Regan family history as well as a growing collection of old and new photos. |
| O'Reilly | | Tom and Michelle (Washington, England), photos of wedding, holidays, relatives and friends. |
| O'Rourke | | The web home of the O'Rourke family (Simon, Susan, Liam, Madeleine, and Jack) with photos, links, and news. [Newcastle, New South Wales, Australia] |
| O'Sullivan | | A family site dedicated to the O'Sullivan family (via Denis) of Carrigaline County Cork Ireland and the Cipriani family (via Graziella) of Campoli Appennino Italy. |
| Oakleaf | | Sue and Scott, Bob and Mary, and Dave (Chicago, USA) along with Mike and Joanne (Wisconsin, USA) and Linda (North Carolina, USA). Family news, photos, and a memorial dedicated to Pat Oakleaf. |
| Oberman | | Lheila, Rochelle, Gerald and Jolyon (Brighton, UK). Family tree and photos. |
| Odam | | Mary, Ken, Elizabeth, Hamish, Fergus (Ipswich, England). Interests music, e-mail contacts, photos. |
| Odam | | Mark Odam's family tree with 9 generations of Odam dating back to 1700. Includes photo's and family history. |
| Oey | | Sally (Flagstaff, Arizona, USA), Tim, Patty, Tandre', Torion (Sunnyvale, California, USA). Pictures, news, articles. |
| Ogden | | Rodney, Sandra, Elyse (Frisco, Texas, USA). Activities, employers, resumes, recipes, links, class notes, pictures, newsletters. |
| Ogilvie | | Debra and Mike (Richmond, Virginia, USA). Pictures, news, links. |
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