| Oligonucleotide | Oligonucléotide |
| oligopoly | oligopole |
| Oligotrophic | Oligotrophe |
| Olimpia | Olympia |
| Olimpia Asunción | Club Olimpia |
| Olimpia Milano | Olimpia Milan |
| Olimpiada Ivanova | Olimpiada Ivanova |
| Olimpija Ljubljana | NK Olimpija Ljubljana |
| Olimpo de Bahía Blanca | Club Olimpo |
| Olin Chaddock Wilson | Olin Wilson |
| Olinda | Olinda |
| Olingo | Bassaricyon |
| Olinia | Oliniaceae |
| olive | olive |
| Olive Baboon | Papio anubis |
| olive oil | huile d'olive |
| olive oil mill wastewater | lies d'huile |
| Olive Oyl | Olive Oyl |
| Olive shell | Olividae |
| olive tree | olivier |
| Olive-backed Euphonia | Organiste olive |
| Olive-colored | Olivier |
| Olive-headed Lorikeet | Loriquet eutèle |
| Oliveira | Oliveira |
| Oliveira de Azeméis | Oliveira de Azeméis |
| Oliveira de Frades | Oliveira de Frades |
| Oliveira do Hospital | Oliveira do Hospital |
| Olivenza | Olivenza |
| Oliver | Olivier |
| Oliver Bierhoff | Oliver Bierhoff |
| Oliver Cromwell | Oliver Cromwell |
| Oliver Heaviside | Oliver Heaviside |
| Oliver Hirschbiegel | Oliver Hirschbiegel |
| Oliver Joseph Lodge | Oliver Lodge |
| Oliver Kahn | Oliver Kahn |
| Oliver Kovačević | Oliver Kovačević |
| Oliver Neuville | Oliver Neuville |
| Oliver Plunkett | Olivier Plunket |
| Oliver Riedel | Oliver Riedel |
| Oliver Sacks | Oliver Sacks |
| Oliver Smithies | Oliver Smithies |
| Oliver St John Gogarty | Oliver St John Gogarty |
| Oliver Stone | Oliver Stone |
| Oliver Tambo | Oliver Tambo |
| Oliver Tuku Mtukudzi | Oliver Mtukudzi |
| Oliver Twist | Oliver Twist |
| Olives | Olivier |
| Olivia | Olivia |
| Olivia de Havilland | Olivia de Havilland |
| Olivia Lufkin | Olivia Lufkin |
| Olivia Newton-John | Olivia Newton-John |
| Olivier | Olivier |
| Olivier Besancenot | Olivier Besancenot |
| Olivier Blanchard | Olivier Blanchard |
| Olivier de Clisson | Olivier IV de Clisson |
| Olivier de la Marche | Olivier de la Marche |
| Olivier Grouillard | Olivier Grouillard |
| Olivier Levasseur | Olivier Levasseur |
| Olivier Messiaen | Olivier Messiaen |
| Olivier Panis | Olivier Panis |
| Olivier Schoenfelder | Olivier Schoenfelder |
| Olivier van Noort | Olivier van Noort |
| Olivine | Olivine |
| Olkiluoto Nuclear Power Plant | Olkiluoto |
| Ollantaytambo | Ollantaytambo |
| Ollantaytambo District | Ollantaytambo |
| Ollastra Simaxis | Ollastra |
| Olli Jokinen | Olli Jokinen |
| Olli Rehn | Olli Rehn |
| Olli Remes | Olli Remes |
| Ollie | Ollie |
| Olliergues | Olliergues |
| Ollon | Ollon |
| Olmaliq | Almalyk |
| Olmec | Olmèques |
| Olmec hieroglyphs | Stèle de Cascajal |
| Olmeca | Olmèques |
| Olmstead Falls | Olmstead Falls |
| Olof Palme | Olof Palme |
| Olof Palme Prize | Prix Olof Palme |
| Olof Rudbeck the Younger | Olof Rudbeck le Jeune |
| Olof Skötkonung | Olof de Suède |
| Olof Swartz | Olof Peter Swartz |
| Oloid | Oloïde |
| Olokun | Olokun |
| Olomouc | Olomouc |
| Olomouc District | Olomouc |
| Olomouc Synagogue | Synagogue |
| Olorus | Oloros |
| Olosega Island | Olosega Island |
| OLPC | One Laptop per Child |
| Olpe | Olpe |
| Olsen Brothers | Olsen Brothers |
| Olsztyn | Olsztyn |
| OLT | Olt |
| Olt County | Judeţ de Olt |
| Olt River | Olt |
| Oltcit | Oltcit |
| Olten | Olten |
| Oltenia | Olténie |
| Oltingen | Oltingen |
| Oluf Haraldsen | Oluf II de Danemark |
| Olusegun Obasanjo | Olusegun Obasanjo |
| Olustee | Olustee |
| Olybrius | Olybrius |
| Olympe de Gouges | Olympe de Gouges |
| Olympe Maxime | Madame Maxime |
| Olympia | Olympia |
| Olympia Dukakis | Olympia Dukakis |
| Olympia Larissa | Larissas Athènes |
| Olympia Mancini | Olympe Mancini |
| Olympiacos | Olympiakos Le Pirée |
| Olympiacos BC | Olympiakós |
| Olympiacos FC | Olympiakos Le Pirée |
| Olympiacos SC | Olympiakos |
| olympiad | olympiade |
| Olympiakos | Olympiakos Le Pirée |
| Olympiakos Nicosia | Olympiakos Nicosie |
| Olympian | Stade Olympique |
| Olympias | Olympias |
| Olympic | olympique |
| Olympic Airlines | Olympic Airways |
| Olympic Anthem | Hymne olympique |
| Olympic Flame | Flamme olympique |
| Olympic Games | Jeux olympiques |
