| odorant | redolent |
| odorat | smell |
| Odorheiu Secuiesc | Odorheiu Secuiesc |
| Odoric de Pordenone | Odoric of Pordenone |
| odoriférant | odoriferous |
| Odra Wodzislaw Slaski | Odra Wodzisław |
| Odumegwu Emeka Ojukwu | Chukwuemeka Odumegwu Ojukwu |
| Odysseas Elytis | Odysseas Elytis |
| Odyssey | Magnavox Odyssey |
| Odysséas Androútsos | Odysseas Androutsos |
| Odysséas Angelís | Odysseas Aggelis |
| Odysséas Elýtis | Odysseas Elytis |
| Odyssée | Odyssey |
| Odzoun | Odzun |
| Odénat | Odaenathus |
| Odžaci | Odžaci |
| Oe | Oe |
| Oebisfelde | Oebisfelde |
| Oecophoridae | Oecophoridae |
| Oecuménisme | Oikoumene |
| Oecussi-Ambeno | Oecussi-Ambeno |
| Oedemeridae | Oedemeridae |
| Oedipe | Oedipus |
| Oedémateux | Sammy |
| Oeil | Eye |
| Oeil perçant | Hawkeye |
| Oeilleton | Eye |
| Oekaki | Oekaki |
| Oekingen | Oekingen |
| Oelde | Oelde |
| Oengus | Aengus |
| Oengus Ier | Óengus I of the Picts |
| Oengus II des Pictes | Óengus II of the Picts |
| Oeno Island | Oeno Island |
| Oenococcus oeni | Oenococcus |
| Oensingen | Oensingen |
| Oeschenbach | Oeschenbach |
| Oeschgen | Oeschgen |
| Oesling | Oesling |
| Oesophage | Esophagus |
| Oesterreichische Nationalbank | Oesterreichische Nationalbank |
| oestre | gadfly |
| Oetwil am See | Oetwil am See |
| Oetwil an der Limmat | Oetwil an der Limmat |
| Oetz | Oetz |
| oeuf | egg |
| Oeuf coque | What I had in mind |
| Oeuf de poule | Egg |
| Oeuf mollet | What I had in mind |
| Oeufs brouillés | Scrambled eggs |
| Oeufs pochés | Poached eggs |
| Ofanto | Ofanto |
| Ofaqim | Ofakim |
| Off-the-Record Messaging | Off-the-Record Messaging |
| Offa de Mercie | Offa of Mercia |
| Offenbach | Offenbach |
| Offenbach am Main | Offenbach am Main |
| Offenbourg | Offenburg |
| offensant | offending |
