| oltretomba | across |
| Oltreuomo | Superman |
| Olusegun Obasanjo | Olusegun Obasanjo |
| Olustee | Olustee |
| Olympe de Gouges | Olympe de Gouges |
| Olympia | Olympia |
| Olympia Dukakis | Olympia Dukakis |
| Olympiakos Nicosia | Olympiakos Nicosia |
| Olympiakos Pireo | Olympiacos FC |
| Olympic | RMS Olympic |
| Olympic Airlines | Olympic Airlines |
| Olympique Lyonnais | Olympique Lyonnais |
| Olympique Marsiglia | Olympique de Marseille |
| Olympos | Olympos |
| Olympus | Olympus Corporation |
| Olympus Mons | Olympus Mons |
| Oléron | Oléron |
| Olëkminsk | Olyokminsk |
| Olóngapo | Olongapo City |
| Om mani padme hum | Om mani padme hum |
| Omaccio | Greebo |
| omaggio | complimentary |
| Omaggio alla Catalogna | Homage to Catalonia |
| Omaha | Omaha |
| Omaha Beach | Omaha Beach |
| Omake | Omake |
| Oman | Oman |
| Omar | Umar |
| Omar Abdel-Rahman | Omar Abdel-Rahman |
| Omar Al-Ghamdi | Omar Al-Ghamdi |
| Omar al-Mukhtar | Omar Mukhtar |
| Omar Bongo | Omar Bongo |
| Omar Bradley | Omar Bradley |
| Omar Epps | Omar Epps |
| Omar Hassan Ahmad al-Bashir | Omar al-Bashir |
| Omar Khayyam | Omar Khayyám |
| Omar Pène | Omar Pène |
| Omar Sharif | Omar Sharif |
| Omar Sivori | Omar Sívori |
| Omar Torrijos | Omar Torrijos |
| Omari Tetradze | Omari Tetradze |
| omaro | lobster |
| omaso | third stomach |
| Omastar | Omastar |
| Omatropina | Homatropine |
| Omayyadi | Umayyad |
| ombelico | navel |
| ombra | hint |
| Ombre e nebbia | Shadows and Fog |
| Ombre volanti | Shadow band |
| ombreggiare | hatch |
