| Oloïde | Oloid |
| OLP | PLO |
| Olpe | Olpe |
| Olsen Brothers | Olsen Brothers |
| Olsztyn | Olsztyn |
| Olt | Olt River |
| OLT Ostfriesische Lufttransport | Ostfriesische Lufttransport |
| Oltcit | Oltcit |
| Olten | Olten |
| Oltingen | Oltingen |
| Olténie | Oltenia |
| Oluf Ier de Danemark | Olaf I of Denmark |
| Oluf II de Danemark | Olaf II of Denmark |
| Oluf III de Danemark | Olav IV of Norway |
| Olusegun Obasanjo | Olusegun Obasanjo |
| Olustee | Olustee |
| Olve Eikemo | Abbath Doom Occulta |
| Olybrius | Olybrius |
| Olympe | Olympus |
| Olympe de Gouges | Olympe de Gouges |
| Olympe Mancini | Olympia Mancini |
| Olympe Maxime | Olympe Maxime |
| Olympia | Olympia |
| Olympia Dukakis | Olympia Dukakis |
| olympiade | olympiad |
| Olympiades internationales de mathématiques | International Mathematical Olympiad |
| Olympiades Internationales de Physique | International Physics Olympiad |
| Olympiades internationales de sciences | International Science Olympiad |
| Olympiakos | Olympiacos SC |
| Olympiakos Le Pirée | Olympiacos FC |
| Olympiakos Nicosie | Olympiakos Nicosia |
| Olympiakós | Olympiacos BC |
| Olympias | Olympias |
| Olympic Airways | Olympic Airlines |
| Olympic Mountains | Olympic Mountains |
| Olympic Oval | Olympic Oval |
| Olympie | Olympia |
| Olympiodore | Olympiodorus of Thebes |
| Olympiodore de Thèbes | Olympiodorus of Thebes |
| Olympiodore le jeune | Olympiodorus the Younger |
| Olympiodore le péripatéticien | Olympiodorus the Elder |
| Olympion | Temple of Olympian Zeus |
| olympique | Olympic |
| Olympique de Béja | Olympique Béja |
| Olympique de Khouribga | Olympique Khouribga |
| Olympique de Marseille | Olympique de Marseille |
| Olympique de Safi | Olympique Safi |
| Olympique lyonnais | Olympique Lyonnais |
| Olympiques | Olympics |
| Olympiques de Gatineau | Gatineau Olympiques |
| Olympiéion | Temple of Olympian Zeus |
| Olympos | Olympos |
| Olympus | Olympus Corporation |
| Olympus Mons | Olympus Mons |
| Oláibar | Oláibar |
| oléoduc | pipeline |
| Oléoduc Bakou-Tbilissi-Ceyhan | Baku-Tbilisi-Ceyhan pipeline |
| Oléoduc Druzhba | Druzhba pipeline |
| Oléoduc trans-Alaska | Trans-Alaska Pipeline System |
| oléographie | oleograph |
| Oléoplaste | Elaioplast |
| OMAC Project | The OMAC Project |
| Omaha | Omaha |
| Omaha Beach | Omaha Beach |
| Omake | Omake |
| Oman | Oman |
| Omar | Umar |
| Omar Al Mokhtar | Omar Mukhtar |
| Omar Al-Ghamdi | Omar Al-Ghamdi |
| Omar Bakri Muhammad | Omar Bakri Muhammad |
| Omar Ben Hafsun | Umar ibn Hafsun |
| Omar Bongo Ondimba | Omar Bongo |
| Omar Bradley | Omar Bradley |
| Omar el-Béchir | Omar al-Bashir |
| Omar Epps | Omar Epps |
| Omar ibn al-Khattab | Umar |
| Omar Karamé | Omar Karami |
| Omar Khayyam | Omar Khayyám |
| Omar Rodriguez-Lopez | Omar Rodríguez-López |
| Omar Sharif | Omar Sharif |
| Omar Sivori | Omar Sívori |
| Omar Torrijos | Omar Torrijos |
| Omar Troussier | Philippe Troussier |
| Omari Tetradze | Omari Tetradze |
| Omayra Sanchez | Omayra Sánchez |
| ombelle | umbel |
| ombellifère | umbellifer |
| Ombellifères | Apiaceae |
| ombilic | navel |
| Omble chevalier | Arctic char |
| ombrage | umbrage |
| Ombrage Gouraud | Gouraud shading |
| Ombrage Phong | Phong shading |
| ombrager | shade |
| ombrageux | touchy |
| ombragé | shadowy |
| ombre | flavor |
| Ombre commun | Umber fish |
| Ombre portée | Drop shadow |
| ombre à paupières | eye shadow |
| ombrelle | sunshade |
| Ombres et brouillard | Shadows and Fog |
| Ombrette du Sénégal | Hammerkop |
| Ombrie | Umbria |
| Ombrien | Umbrian |
| Ombrienne | Umbrian |
| Ombriens | Umbrian language |
| Ombrine | Umbrine |
| ombudsman | ombudswoman |
| OMC | World Trade Organization |
| Omdourman | Omdurman |
| Omdurman | Omdurman |
| Omega | Omega SA |
| Omega Red | Omega Red |
| OmegaWiki | WiktionaryZ |
| Omegna | Omegna |
| omelette | omelette |
| Omelette aux fines herbes | Savoury omelette |
| Omer | Counting of the Omer |
