| olimpiade | olympiad |
| Olimpiadi | Olympic Games |
| Olimpiadi degli scacchi | Chess Olympiad |
| Olimpiadi estive | Summer Olympic Games |
| Olimpiadi Internazionali della Matematica | International Mathematical Olympiad |
| Olimpiadi invernali | Winter Olympic Games |
| Olimpiadi scientifiche | International Science Olympiad |
| olimpico | Olympic |
| Olimpiodoro di Tebe | Olympiodorus of Thebes |
| olimpionico | Olympic |
| Olimpo | Olympus |
| Olimpo de Bahía Blanca | Olimpo de Bahía Blanca |
| Olimps Rīga | JFK Olimps Rīga |
| Olinda | Olinda |
| olio | oil |
| olio combustibile | fuel oil |
| olio d'oliva | olive oil |
| olio di fegato di merluzzo | cod-liver oil |
| olio di girasole | sunflower oil |
| olio di gomito | elbow grease |
| olio di lino | flaxseed oil |
| Olio di oliva | Olive oil |
| Olio di olive | Olive oil |
| olio di palma | palm oil |
| olio di ricino | castor oil |
| Olio di riso | Rice bran oil |
| Olio di semi | Petroleum |
| olio di semi di girasole | sunflower oil |
| olio di semi di lino | linseed oil |
| olio di sentina | bilge oil |
| Olio essenziale | Essential oil |
| olio minerale | mineral oil |
| olio per raffreddamento | cooling oil |
| olio solare | suntan lotion |
| olio vegetale | vegetable oil |
| oliva | olive |
| Olive | Olive |
| Oliveira de Azeméis | Oliveira de Azeméis |
| Oliveira de Frades | Oliveira de Frades |
| Oliveira do Hospital | Oliveira do Hospital |
| Olivenza | Olivenza |
| Oliver | Oliver |
| Oliver Bierhoff | Oliver Bierhoff |
| Oliver Cromwell | Oliver Cromwell |
| Oliver Goldsmith | Oliver Goldsmith |
| Oliver Hardy | Oliver Hardy |
| Oliver Heaviside | Oliver Heaviside |
| Oliver Hirschbiegel | Oliver Hirschbiegel |
| Oliver Hutton | Tsubasa Ozora |
| Oliver Joseph Lodge | Oliver Joseph Lodge |
| Oliver Kahn | Oliver Kahn |
| Oliver Neuville | Oliver Neuville |
| Oliver Norvelle Hardy | Oliver Norvelle Hardy |
| Oliver Plunkett | Oliver Plunkett |
| Oliver Riedel | Oliver Riedel |
| Oliver Sacks | Oliver Sacks |
| Oliver Smithies | Oliver Smithies |
| Oliver Stone | Oliver Stone |
| Oliver Tambo | Oliver Tambo |
| Oliver Twist | Oliver Twist |
| Olivetani | Olivetans |
| olivetta di legno | toggle |
| Olivia | Olive Oyl |
| Olivia De Berardinis | Olivia De Berardinis |
| Olivia de Havilland | Olivia de Havilland |
| Olivia Lufkin | Olivia Lufkin |
| Olivia Newton-John | Olivia Newton-John |
| Olivier Besancenot | Olivier Besancenot |
| Olivier Grouillard | Olivier Grouillard |
| Olivier Messiaen | Olivier Messiaen |
| Olivier Panis | Olivier Panis |
| Olivina | Olivine |
| olivo | olive tree |
| Olkusz | Olkusz |
| Ollantaytambo | Ollantaytambo |
| Ollastra | Ollastra Simaxis |
| Ollersdorf im Burgenland | Ollersdorf im Burgenland |
| Olli Rehn | Olli Rehn |
| Ollie | Ollie |
| Olliergues | Olliergues |
| Ollon | Ollon |
| Olly Barkley | Olly Barkley |
| Olmechi | Olmec |
| olmio | holmium |
