| O 3 | O 4 | O 5 |
| O 6 | O 7 | O 8 |
| O 9 | O 9-klasse | O alte Burschenherrlichkeit |
| O Amor Natural | O Amor Natural (boek) | O Amor Natural (film) |
| O arise all you sons of this land | O Arise, All You Sons | O Baixo Miño |
| O Baixo Mino | O Barco de Valdeorras | O Bobo |
| O Bolo | O bon vin, où as-tu crû | O bon vin, ou as-tu cru |
| O brother where art thou | O brother where art thou? | O brother, where art thou |
| O Brother, Where Art Thou? | O Canada | O Canada! |
| O Carballiño | O Carballino | O Condado |
| O Corgo | O Dame get up and bake your pies | O denneboom |
| O dennenboom | O Deza | O die 3 |
| O Dragao da Maldade contra o Santo Guerreiro | O Dragao da Maldade Contra o Santo Guerreiro | O Dragão da Maldade contra o Santo Guerreiro |
| O Dragão da Maldade Contra o Santo Guerreiro | O du, der du die Liebe bist | O Earth, O Stars |
| O Ejebjaerg | O esca viatorum | O Eume |
| O Ewigkeit, du Donnerwort | O filii et filiae | O fons Bandusiae |
| O Fortuna | O Globo | O Gran Camiño |
| O Grove | O Haupt voll Blut und Wunden | O heil'ge nacht |
| O Heraldo | O Holy Night | O hoofd vol bloed en wonden |
| O II | O III | O Incio |
| O intemerata | O Irixo | O IV |
| O julissi | O Kersnacht schooner dan de daegen | O Kerstnacht, schoner dan de dagen |
| O Kerstnacht, schooner dan de daegen | O Lam | O le Ao o le Malo |
| O Long Vi | O Lord God of hosts | O Lucky Man! |
| O mie | O mijn God-deeltje | O mijn papa |
| O mio babbino caro | O Morrazo | O morte |
| O Mundo | O o Den Haag | O O Den Haag |
| O Ornitólogo | O ornitólogo | O Pagador de Promessas |
| O papagaio do moleque | O Paramo | O Páramo |
| O Pereiro de Aguiar | O Pino | O plus S |
| O Porriño | O Porrino | O Praise God in his Holiness |
| O que arde | O reinste der schepselen | O Ribeiro |
| O RLY | O rly | O RLY? |
| O Rosal | O sabor das margaridas | O Salnés |
| O Salnes | O Sar | O Saviñao |
| O Savinao | O Sensei | O sensei |
| O Sole Mio | O Sterre der Zee | O styago le romengo |
| O Superman | O Surdato 'Nnamurato | O Sweet Saint Martin's Land |
| O sweet Saint-Martin's Land | O tannenbaum | O telefone chora |
| O tempora! o mores! | O tempora, o mores | O tempora, o mores! |
| O Thiasos | O Thiassos | O V |
| O Valadouro | O Veux | O Vicedo |
| O Welt, ich muss dich lassen | O Yeah Aha Oh | O&g verpleegkundige |
| O&g-verpleegkundige | O&I | O&O |
| O&O (restaurant) | O&O Defrag | O' Valley |
| O'42 | O'68 | O'ahu |
| O'Amate | O'Brien | O'Brien (Texas) |
| O'Brien County | O'Brien County (Iowa) | O'Brien County, Iowa |
| O'Brien's Tower | O'Brien-klasse | O'Brienklasse |
| O'Briensbridge | O'Callaghans Mills | O'Carolan |
| O'Connell Bridge | O'Connell Street | O'Connor |
| O'connor | O'Cool | O'Day |
| O'Death | O'Donel Levy | O'Donnel's |
| O'Donnell | O'Donnell (metrostation) | O'Donnell (Texas) |
| O'Donoghue's | O'Donoghue's Pub | O'Fallon |
| O'Fallon (Illinois) | O'Fallon (Missouri) | O'G3NE |
| O'Hanlons Helden | O'Hara | O'hara |
| O'Hara Township | O'Hara Township (Pennsylvania) | O'Hara's Playboys |
| O'Hare International Airport | O'Higgins | O'Higgins (departement) |
| O'Higgins (gemeente) | O'Higginsmeer/San Martínmeer | O'Higginsmeer/San Martinmeer |
| O'Jays | O'jays | O'Kean |
| O'Kean (Arkansas) | O'Keefe | O'Keeffe |
| O'Kelly de Galway | O'Kellygambiet | O'Neil Longson |
| O'neil Longson | O'Neill | O'Neill (Nebraska) |
| O'Neill Spencer | O'o | O'O |
| O'obibi | O'odham | O'Reilly |
| O'reilly | O'Russei markt | O'Russeimarkt |
| O'Shaughnessy's kameleon | O'Shea Jackson | O'Shea Jackson jr. |
| O'Shea Jackson Jr. | O'Sheas Casino | O'Tacos |
| O'Toole | O'toole | O'u |
| O'zbekiston Respublikasining Davlat Madhiyasi | O'zbekiston Superligasi | O+S |
| O+S (band) | O, dat je doodgaat | O, die herfstdagen, die allerlaatste mooie herfstdagen |
| O, Holy Night | O, Kerstnacht, schoner dan de dagen | O, kom er eens kijken |
| O, mijn papa | O, o, Den Haag | O, O, Den Haag |
| O, reinste der schepselen | O, Sørland, du min moderjord | O, Sorland, du min moderjord |
| O, The Oprah Magazine | O,159 Transport (schip, 1928) | O,O-dimethyldithiofosforzuur |
| O,S-Dimethyl phosphorochloridothioate | O-1 | O-1 (Turkije) |
| O-11 | O-12 | O-14 |
| O-2 | O-2 (Turkije) | O-20 |
| O-20 (Turkije) | O-21 (Turkije) | O-21A (Turkije) |
| O-22 | O-22 (Turkije) | O-3 |
| O-3 (Turkije) | O-30 (Turkije) | O-31 (Turkije) |
| O-32 (Turkije) | O-33 (Turkije) | O-4 |
| O-4 (Turkije) | O-5 | O-5 (Turkije) |
| O-50 (Turkije) | O-51 (Turkije) | O-52 (Turkije) |
| O-53 (Turkije) | O-54 (Turkije) | O-6 (Turkije) |
| O-7 (Turkije) | O-aminofenol | O-anisidine |
| O-antifonen | O-antifoon | O-antigeen |
| O-Bahn | O-been | O-benen |
| O-chloorbenzaldehyde | O-chloorbenzylideenmalonitril | O-chloorbenzylideenmalonnitril |
| O-chloorfenol | O-chloranil | O-cresylglycidylether |
| O-cymeen | O-di-ethylbenzeen | O-diethylbenzeen |
| O-Dog | O-dog | O-ethyl-O-4-nitrofenylfenylthiofosfonaat |
| O-Game | O-gō | O-go |
| O-gon Kwon | O-Gon Kwon | O-goshi |
| O-H-Hemelvaart | O-I | O-klasse |
| O-League | O-nitrotolueen | O-notatie |
| O-pa-me | O-Ren Ishii | O-ring |
| O-Ringen | O-ringen ketting | O-ringenketting |
| O-sekoer | O-Shen | O-soto-gari |
