| otålighet | zeal |
| Ouadane | Ouadane |
| Ouagadougou | Ouagadougou |
| Oualata | Oualata |
| Ouarzazate | Ouarzazate |
| Oubangui | Ubangi River |
| oubliett | dungeon |
| Oud | Oud |
| Oudenaarde | Oudenaarde |
| Oued Ed-Dahab-Lagouira | Oued Ed-Dahab-Lagouira |
| Ouezzane | Ouezzane |
| Ouguiya | Mauritanian ouguiya |
| OUI | Organizationally Unique Identifier |
| Oujda | Oujda |
| Oulais | Oulainen |
| Oulanka nationalpark | Oulanka National Park |
| Oulens-sous-Echallens | Oulens-sous-Echallens |
| Oulens-sur-Lucens | Oulens-sur-Lucens |
| Oulton Park Circuit | Oulton Park |
| Oulujoki kommun | Oulujoki |
| Oulun Luistinseura | Oulun Luistinseura |
| Oulun Palloseura | Oulun Palloseura |
| oumbärlig | indispensable |
| oundgänglig | essential |
| oundviklig | inevitable |
| oundvikligen | inevitably |
| oundviklighet | inevitability |
| ouppfostrad | ill-bred |
| oupphörlig | uninterrupted |
| oupphörligen | ceaselessly |
| oupphörligt | continuously |
| ouppklarad | unsettled |
| ouppklarad sak | unfinished business |
