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Oliver-Velez - Ancestors of Denise Roberts Oliver-Velez including the surnames Oliver, Velez, Roberts, Weaver, Williams, Bodine, and Bratt.
http://www.wemba-music.org/ancestor.htm

Osburn Family History - Ancestral heritage including the surnames Osburn, Bollinger, Burt and Sharp.
http://members.tripod.com/~jowhite/

Overcast Family - Ancestral heritage of Louis Overcast including associated lineages and links.
http://www.overcastfamily.com/

Ossowski: Search - Seeking information on Semyon Ionov Ossowski's relatives and those connected to the family blood line. Compiled by Alex Ossowski.
http://ossowski.narod.ru/

Ottolenghi - All family members regardless of country and relation. Includes spelling variants of Ottolenghi and Ottolangui.
http://www.ottolenghi.org/

Oster - Ancestors and descendants of Joseph Hickman Oster and Henrietta Marie Galliano as compiled by Brian Joseph Oster. Features the surnames Oster, Hickman, Galiano, Ledet and Kennedy. Includes abstracts of Missouri marriages and Louisiana obituaries.
http://www.vienici.com/

Orear - Communication and information forum for O'Rears and Orears.
http://www.orear.com/

Orrell Family Association - Research repository for Orrell and variations, worldwide and all time periods.
http://www.orrellfamily.com/

Oshel - History, pedigree and application of the name.
http://www.oshel.com/

Ogbourne Chronicles - Historical information relating to the names and its variants in the UK and USA. Includes descendants of slaves owned by Charles Harrison Ogburn of Mecklenburg, Virginia.
http://www.oginet.com/Chronicles/

Orton Archive - Historical data, will abstracts, deeds and parish register entries relating to Reginald Orton 1810-1862. Includes British ancestors, Inman of Nidderdale, Bayles of Laxton, Peirse of Bedale, Wastell of Scorton and Hutton of Marske. Compiled by Nancy McLaughlin.
http://freepages.history.rootsweb.ancestry.com/~enzedders/

Olley - Family history including associated lineages, message board and photographs.
http://www.olley.org/

Orzell - Researching the family lines from Galicia to Connecticut and Vermont and throughout the USA.
http://pages.cthome.net/orzell/

Ollis - Multinational family histories pertaining to the name Ollis including photographs, memorials, vital records and lineages during War.
http://freepages.genealogy.rootsweb.ancestry.com/~ollis/

Orlovac - Descendants of Nikola Orlovac and Potomci od Nikole Orlovac including the lineages of Golub, Barisic and Lukenda from Bukovica. Compiled by Marinko Orlovac.
http://familytreemaker.genealogy.com/users/o/r/l/Marinko-Orlovac/

Oxman - Worldwide single name study.
http://www.littlewhitebull.com/oxman1/

Olds Family - Ancestral research featuring pedigree, photographs and resources. Includes the variants Oulds and Old.
http://www.olds-family.com/

Olano Family - Ancestral heritage presented by Cristino Jose Olano in English and Spanish.
http://olanofamily.homestead.com/

Olive - Ancestral heritage of Fred Olive from AL, USA.
http://www.dpo.uab.edu/~folive/

O'Dochartaigh Forever - Community research centre with online newspapers and private chatroom. Includes associated links and gift emporium.
http://dohertyclann.homestead.com/

Oddy: Sandy's Family History - Features ahnentafel chart and the surnames Oddy, Howes, Fincher and Plumley.
http://sandys.50megs.com/