| Ottokar I of Bohemia | Otakar I de Bohemia |
| Ottokar II of Bohemia | Otakar II de Bohemia |
| Ottokar Novacek | Ottokar Novacek |
| ottoman | otomano |
| Ottoman Dynasty | Osmanlíes |
| Ottoman Empire | Imperio Otomano |
| Ottoman Greece | Grecia Otomana |
| Ottoman Interregnum | Interregno otomano |
| Ottoman poetry | Literatura de Turquía |
| Ottoman Turks | Turcos |
| Ottone Visconti | Otón Visconti |
| Ottonian | Dinastía Sajona |
| Ottonian art | Arte otoniano |
| Ottonian dynasty | Dinastía Sajona |
| Ottonian Renaissance | Arte otoniano |
| Ottorino Respighi | Ottorino Respighi |
| Ottó Bláthy | Otto Blathy |
| Ottón Solís | Ottón Solís Fallas |
| Otumba | Batalla de Otumba |
| Otuzco Province | Provincia de Otuzco |
| Otxandio | Ochandiano |
| Ouadane | Ouadane |
| Ouagadougou | Uagadugú |
| Oualata | Oualata |
| Ouargla Province | Provincia de Ouargla |
| Oubangui-Chari | Ubangui-Chari |
| oubliette | mazmorra |
| Oubritenga | Provincia de Oubritenga |
| ouch | ay |
| Oud | Ud |
| Oudalan | Provincia de Oudalan |
| Oude Kerk | Cristianismo primitivo |
| Oudenaarde | Oudenaarde |
| Oudomxai Province | Provincia de Oudomxay |
| Oudomxay Province | Provincia de Oudomxay |
| Ouessant | Ouessant |
| Ouest Department | Departamento Oeste |
| ought to | deber |
| Ouidah | Ouidah |
| Oujda | Oujda |
| Oulens-sous-Echallens | Oulens-sous-Echallens |
| Oulens-sur-Lucens | Oulens-sur-Lucens |
| Oulipo | Oulipo |
| Oulu | Oulu |
| Oulu Province | Provincia de Oulu |
| Oulu railway station | Oulu |
| Oulujärvi | Oulu |
| ounce | onza |
| our | nuestro |
| Our Common Future | Informe Brundtland |
| Our Gang | La Pandilla |
| Our Hospitality | La ley de la hospitalidad |
| Our Lady | Nuestra Señora |
| Our Lady of Fatima | Virgen de Fátima |
| Our Lady of Guadalupe | Nuestra Señora de Guadalupe |
| Our Lady of Meritxell | Santuario de Meritxell |
| Our Lady of Mount Carmel | Nuestra Señora del Monte Carmelo |
| Our Lady of Sorrows | Virgen de las Angustias |
| Our Land | Maamme |
| Our Lips Are Sealed | Our Lips Are Sealed |
| Our Man in Havana | Nuestro hombre en La Habana |
| Our Ukraine | Nuestra Ucrania |
| Our Ukraine Bloc | Nuestra Ucrania |
| Our Worlds at War | Our Worlds At War |
| Ouran High School Host Club | Ouran High School Host Club |
| Ouranopithecus macedoniensis | Ourunapithecus |
| Ouranosaurus | Ouranosaurus |
| Ourea | Ourea |
| Ourense | Orense |
| Ourique | Ourique |
| Ouro Preto | Ouro Preto |
| Ouroboros | Uróboros |
| ours | nuestro |
| ourselves | nosotros mismos |
| Ousmane Issoufi Maïga | Ousmane Issoufi Maïga |
| Ousmane Sembène | Ousmane Sembène |
| oust | destronar |
| out | fuera |
| out for | decidido a |
