| Oak Valley (New Jersey) | Oak Valley (Texas) | Oak View |
| Oak View (California) | OAKA | OAKA Arena |
| Oakan | Oakboro | Oakbrook |
| Oakbrook Terrace | Oakdale | Oakdale (California) |
| Oakdale (Connecticut) | Oakdale (Illinois) | Oakdale (Louisiana) |
| Oakdale (Minnesota) | Oakdale (Montville) | Oakdale (Nebraska) |
| Oakdale (New York) | Oakdale (Pennsylvania) | Oakdale (Tennessee) |
| Oakdale (Wisconsin) | Oakdale Productions | Oakden (Australia) |
| Oakengates | Oakes | Oakes (disambigua) |
| Oakes Ames | Oakes Fegley | Oakesdale |
| Oakeshott typology | Oakeshott, Ewart | Oakfield |
| Oakfield (Maine) | Oakfield (New York) | Oakfield (Wisconsin) |
| Oakford | Oakford (Devon) | Oakford (Illinois) |
| Oakford (Indiana) | Oakham | Oakham (Inghilterra) |
| Oakham (Massachusetts) | Oakham (Rutland) | Oakhaven |
| Oakhurst | Oakhurst (California) | Oakhurst (New Jersey) |
| Oakhurst (Oklahoma) | Oakland | Oakland (Carolina del Sud) |
| Oakland (disambigua) | Oakland (Florida) | Oakland (Illinois) |
| Oakland (Iowa) | Oakland (Kentucky) | Oakland (Maine) |
| Oakland (Maryland) | Oakland (Michigan) | Oakland (Mississippi) |
| Oakland (Missouri) | Oakland (Nebraska) | Oakland (New Jersey) |
| Oakland (Oklahoma) | Oakland (Oregon) | Oakland (Tennessee) |
| Oakland 1955 | Oakland A's | Oakland Acres (Iowa) |
| Oakland Alameda Coliseum | Oakland Arena | Oakland Athletics |
| Oakland Buccaneers | Oakland City | Oakland Clippers |
| Oakland Clippers 1967 | Oakland Clippers 1968 | Oakland Coliseum |
| Oakland Coliseum Arena | Oakland International Airport | Oakland Motor Car Company |
| Oakland Museum | Oakland Museum of California | Oakland Oaks |
| Oakland Oaks (1962-1963) | Oakland Oaks (1967-1969) | Oakland Oaks 1962-1963 |
| Oakland Oaks 1967-1968 | Oakland Oaks 1968-1969 | Oakland Park |
| Oakland Raiders | Oakland Raiders 1960 | Oakland Raiders 1961 |
| Oakland Raiders 1962 | Oakland Raiders 1963 | Oakland Raiders 1964 |
| Oakland Raiders 1965 | Oakland Raiders 1966 | Oakland Raiders 1967 |
| Oakland Raiders 1968 | Oakland Raiders 1969 | Oakland Raiders 1970 |
| Oakland Raiders 1971 | Oakland Raiders 1972 | Oakland Raiders 1973 |
| Oakland Raiders 1974 | Oakland Raiders 1975 | Oakland Raiders 1976 |
| Oakland Raiders 1977 | Oakland Raiders 1978 | Oakland Raiders 1979 |
| Oakland Raiders 1980 | Oakland Raiders 1981 | Oakland Raiders 1995 |
| Oakland Raiders 1996 | Oakland Raiders 1997 | Oakland Raiders 1998 |
| Oakland Raiders 1999 | Oakland Raiders 2000 | Oakland Raiders 2001 |
| Oakland Raiders 2002 | Oakland Raiders 2003 | Oakland Raiders 2004 |
| Oakland Raiders 2005 | Oakland Raiders 2006 | Oakland Raiders 2007 |
| Oakland Raiders 2008 | Oakland Raiders 2009 | Oakland Raiders 2010 |
| Oakland Raiders 2011 | Oakland Raiders 2012 | Oakland Raiders 2013 |
| Oakland Raiders 2014 | Oakland Raiders 2015 | Oakland Raiders 2016 |
| Oakland Raiders 2017 | Oakland Raiders 2018 | Oakland Raiders 2019 |
| Oakland Roots | Oakland Roots Sports Club | Oakland Seals |
| Oakland Stompers | Oakland, California | Oakland-Alameda County Coliseum |
| Oakland-Alameda County Coliseum Arena | Oakland–Alameda County Coliseum | Oaklander |
| Oakley | Oakley (azienda) | Oakley (Bedfordshire) |
| Oakley (Buckinghamshire) | Oakley (California) | Oakley (Fife) |
| Oakley (Hampshire) | Oakley (Idaho) | Oakley (Kansas) |
| Oakley (Michigan) | Oakley (Utah) | Oakley (Wyoming) |
| Oaklyn | Oakman | Oakmont |
| Oakmont (Pennsylvania) | Oakridge | Oakridge Glen Oaks Cemetery |
| Oaks | Oaks (ippica) | Oaks (Missouri) |
| Oaks (Oklahoma) | Oaks Club $25,000 USTA Challenger | Oaks Club $25,000 USTA Challenger 2011 |
| Oaks Club $25,000 USTA Challenger 2011 - Doppio | Oaks Club $25,000 USTA Challenger 2011 - Singolare | Oaks Club Challenger |
| Oaks Club Challenger 2012 | Oaks Club Challenger 2012 - Doppio | Oaks Club Challenger 2012 - Singolare |
| Oaks Club Challenger 2013 | Oaks Club Challenger 2013 - Doppio | Oaks Club Challenger 2013 - Singolare |
| Oaks d'Italia | Oaks Napoli | Oakton |
| Oaktown | Oaktree Capital Management | Oakvale |
| Oakview | Oakville | Oakville (Alabama) |
| Oakville (California) | Oakville (Canada) | Oakville (Connecticut) |
| Oakville (Iowa) | Oakville (Ontario) | Oakville (Washington) |
| Oakville, Ontario | Oakwell | Oakwell Stadium |
| Oakwood | Oakwood (Contea di Cuyahoga, Ohio) | Oakwood (Contea di Montgomery, Ohio) |
| Oakwood (contea di Montgomery, Ohio) | Oakwood (Contea di Paulding, Ohio) | Oakwood (contea di Paulding, Ohio) |
| Oakwood (Georgia) | Oakwood (Illinois) | Oakwood (metropolitana di Londra) |
| Oakwood (Missouri) | Oakwood (Oklahoma) | Oakwood (Pennsylvania) |
| Oakwood (Texas) | Oakwood Hills | Oakwood Park |
| Oal | OAL | Oalex Anderson |
| Oam | OAM | Oama |
| Oamaru | Oamaruvian | OAMI |
| Oamishirasato | Oan | OAN |
| Oana Ban | Oana Mihaela Ban | Oana Muşunoi |
| Oana Mușunoi | Oana Mușunoi-Pantelimon | Oana Pantelimon |
| Oana Pellea | Oancea | Oanțu |
| Oanis | Oannes | Oannes (Stargate) |
| Oanuava Coronae | OAPEC | Oaphantes |
| Oaphantes pallidulus | Oar | OAR |
| Oarai | Oare | Oare (Kent) |
| OARE Bologna | Oarecare | Oarța de Jos |
| Oarța de Sus | Oarf | Oarja |
| OARN | Oars Jr. | Oarta de Jos |
| Oarweed | Oarzina | Oas |
| OAS | Oas (Albay) | OASE |
| Oase 2 | Oasi | Oasi (album) |
| Oasi (area protetta) | Oasi (disambigua) | Oasi (EP) |
| Oasi (film 1955) | Oasi (film 1994) | Oasi agrumaria di Rodi Garganico |
| Oasi antartica | Oasi Arcola | Oasi avifaunistica |
| Oasi avifaunistica del fiume Nata | Oasi avifaunistica dell'isola di Olango | Oasi Bassarone |
| Oasi Bianello | Oasi blu di Gianola | Oasi blu di Monte Orlando |
| Oasi blu Villa di Tiberio | Oasi Bojo della Ferriana | Oasi Bosco Camerine |
| Oasi Bosco del Vignolo | Oasi Bosco di Cornacchiaia | Oasi Bosco di San Silvestro |
| Oasi Bosco Romanazzi | Oasi Canneviè-Porticino | Oasi Casacalenda |
| Oasi Castel di Guido | Oasi Celestina | Oasi dei Variconi |
| Oasi del Bassone-Torbiera di Albate | Oasi del Bosco di Montorfano | Oasi del Busatello |
| Oasi del Fayyum | Oasi del Lago di Alanno - Piano d'Orta | Oasi del Monte Dente |
| Oasi del Nervia | Oasi del Simeto | Oasi dell'amore |
