Olive 
Ancestral heritage of Fred Olive from AL, USA.
http://www.dpo.uab.edu/~folive/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/
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/
Olano Family 
Ancestral heritage presented by Cristino Jose Olano in English and Spanish.
http://olanofamily.homestead.com/
Okouneff 
Ancestors of Sharon Okouneff featuring the surnames Lieberman, Morgenstern, Tritsch, Wassertrilling, Wassing, Popper, Kohn and Janowsky; from Austria, Czechoslovakia and Russia (primarily of Jewish origin).
http://www.geocities.com/okouneff/
Orzell 
Researching the family lines from Galicia to Connecticut and Vermont and throughout the USA.
http://pages.cthome.net/orzell/
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/
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
Oakes 
Descendents of David Oaks, an early pioneer in Western North Carolina and Tennessee, USA.
http://hometown.aol.com/oakesbk/
Overcast Family 
Ancestral heritage of Louis Overcast including associated lineages and links.
http://www.overcastfamily.com/
Osburn Family History 
Ancestral heritage including the surnames Osburn, Bollinger, Burt and Sharp.
http://members.tripod.com/~jowhite/
Oppersma Family Tree 
Ancestral research including the surnames Cleworth, Davies, Edinburgh and Reedy.
http://www.oppersmatree.homestead.com/
Oddy: Sandy's Family History 
Features ahnentafel chart and the surnames Oddy, Howes, Fincher and Plumley.
http://sandys.50megs.com/
Olds Family 
Ancestral research featuring pedigree, photographs and resources. Includes the variants Oulds and Old.
http://www.olds-family.com/
Ogasawara Clan 
Descendants of Ogasawara Jiro Nagakiyo (1163-1242) including associated lineages.
http://hometown.aol.com/uchuujin/
Ogle 
Researching the Hoffman, Ogle, Creech and Butz families; settled in the state of Kansas for the most part.
http://www.geocities.com/Heartland/Pointe/6533/
Olley 
Family history including associated lineages, message board and photographs.
http://www.olley.org/
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.com/~enzedders/
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/
Odendahl 
Ancestral history of Theresa Marie Idica and Teresa (Terry) Anne Holmes. Features the ancestors and descendants of William R Odendahl (1822-1894) and Peter Odendahl (1817-1899).
http://members.aol.com/kamoemoe/
Ouimet: Claude's Place 
Family history featuring the surnames Ouiment, Proulx, Leclerc, Leclair and Théoret.
http://www.geocities.com/~couimet/
Odell 
Starting point for research into the Odell name and its variants, with particular emphasis on UK roots.
http://www.odells.info/ode_gene.html
O'Dochartaigh Forever 
Community research centre with online newspapers and private chatroom. Includes associated links and gift emporium.
http://dohertyclann.homestead.com/
Ollis 
Multinational family histories pertaining to the name Ollis including photographs, memorials, vital records and lineages during War.
http://freepages.genealogy.rootsweb.com/~ollis/
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/
Ottolenghi 
All family members regardless of country and relation. Includes spelling variants of Ottolenghi and Ottolangui.
http://www.ottolenghi.org/
Overhof(f) Family-tree 
Contains over 3000 Overhof(f)'s/Oberhof(f)'s from all over the world (mainly USA, Germany, Austria and the Netherlands). Some branches of the family-tree date from before 1600 until now.
http://www.geocities.com/MotorCity/Garage/7613/t0000.htm
Oxman 
Worldwide single name study.
http://www.littlewhitebull.com/oxman1/
Orta Family 
Ancestral heritage of Robert G. Orta including the surnames Orta, DeOrta, Holcomb and Noriega.
http://www.geocities.com/bob_orta@sbcglobal.net/