| Okapi | Okapi |
| Okayama | Okayama prefektur |
| Okazaki | Okazaki |
| Okeh Records | Okeh |
| Okhrana | Ochrana |
| Okhrid | Ohrid |
| Okinawa | Okinawa |
| Okinawa Honto | Okinawa |
| Okinawa Island | Okinawa |
| Oklahoma | Oklahoma |
| Oklahoma City | Oklahoma City |
| Okonomiyaki | Okonomiyaki |
| Oksana Akinchina | Oksana Akinsjina |
| Oktoberfest | Oktoberfest |
| Okubo Toshimichi | Okubo Toshimichi |
| Ola | Vågen |
| Ola Håkansson | Ola Håkansson |
| Olaf Ier de Norvège | Olav I Tryggvason |
| Olaf II de Norvège | Olof av Norge |
| Olaf III de Norvège | Olav III Kyrre |
| Olaf IV de Norvège | Olav Magnusson |
| Olaf Kölzig | Olaf Kölzig |
| Olaf Stapledon | Olaf Stapledon |
| Olafur Ragnar Grimsson | Ólafur Ragnar Grímsson |
| Olanzapine | Olanzapin |
| Olaus Magnus | Olaus Magnus |
| Olav V de Norvège | Olav V av Norge |
| Olbia | Olbia |
| Old Boy | Old Boy - hämnden |
| Old Course | St Andrews Links |
| Old Faithful | Old Faithful |
| Old Firm | Old Firm |
| Old Orchard Beach | Old Orchard Beach |
| Old school | Old School |
| Old Trafford | Old Trafford |
| Oldenbourg | Oldenburg |
| Oldenburg | Oldenburg |
| Oldham | Oldham |
| Oldham Athletic Association Football Club | Oldham Athletic AFC |
| Oldsmobile | Oldsmobile |
| Ole Bull | Ole Bull |
| Ole Christensen Rømer | Ole Rømer |
| Ole Einar Bjørndalen | Ole Einar Bjørndalen |
| OLE for Process Control | OPC |
| Ole Gunnar Solskjær | Ole Gunnar Solskjær |
| Ole Worm | Ole Worm |
| Olea | Olivträd |
| Oleg Blokhine | Oleg Blochin |
| Oleg Cassini | Oleg Cassini |
| Oleg Gordievsky | Oleg Gordievskij |
| Oleg Kotov | Oleg Kotov |
| Oleg le Sage | Oleg av Kiev |
| Oleg Lundstrem | Oleg Lundstrem |
| Oleg Salenko | Oleg Salenko |
| Oleguer Presas | Oleguer Presas |
| Oleksiy Lukashevych | Oleksij Lukasjevitj |
| Olena Zubrilova | Olena Zubrilova |
| Olesya Krasnomovets | Olesia Krasnomovets |
| olfactif | lukt- |
| Olga | Olga |
| Olga Danilova | Olga Danilova |
| Olga de Russie | Storfurstinnan Olga |
| Olga Korbut | Olga Korbut |
| Olga Kotlyarova | Olga Kotljarova |
| Olga Kuzenkova | Olga Kuzenkova |
| Olga Morozova | Olga Morozova |
| Olga Nicolaevna de Russie | Storfurstinnan Olga |
| Olga Nicolaïevna de Russie | Olga Nikolajevna Romanova |
| Olga Prekrasa | Olga av Kiev |
| Olga Preobrajenska | Olga Preobrazjenskaja |
| Olga Pyleva | Olga Pyljova |
| Olga Ryabinkina | Olga Rjabinkina |
| Olga Savialova | Olga Savjalova |
| Olga Zaytseva | Olga Zajtseva |
| Olgoï-Khorkhoï | Mongolska Dödsmasken |
| Olifant | Olifant |
| oligarchie | oligarki |
| oligarchique | oligarkisk |
| oligo-élément | spårelement |
| Oligochaeta | Fåborstmaskar |
| Oligocène | Oligocen |
| oligopole | oligopol |
| Olimpiada Ivanova | Olimpiada Ivanova |
| Olinda | Olinda |
| Oliphant | Olifant |
| olisbos | dildo |
| olive | oliv |
| Oliveira | Olivträd |
| Oliveira da Figueira | Oliveira da Figueira |
| Oliver Bierhoff | Oliver Bierhoff |
| Oliver Cromwell | Oliver Cromwell |
| Oliver Heaviside | Oliver Heaviside |
| Oliver Hirschbiegel | Oliver Hirschbiegel |
| Oliver Kahn | Oliver Kahn |
| Oliver Neuville | Oliver Neuville |
| Oliver Riedel | Oliver Riedel |
| Oliver Sacks | Oliver Sacks |
| Oliver Smithies | Oliver Smithies |
| Oliver Stone | Oliver Stone |
| Oliver Tambo | Oliver Tambo |
| Oliver Twist | Oliver Twist |
| Olivia | Olivia |
| Olivia de Havilland | Olivia de Havilland |
| Olivia Lufkin | Olivia |
| Olivia Newton-John | Olivia Newton-John |
| olivier | olivträd |
| Olivier Besancenot | Olivier Besancenot |
| Olivier européen | Olivträd |
| Olivier Grouillard | Olivier Grouillard |
| Olivier Messiaen | Olivier Messiaen |
| Olivier Panis | Olivier Panis |
| Olivine | Olivin |
| olivâtre | gulblek |
| Ollantaytambo | Ollantaytambo |
| Olli Jokinen | Olli Jokinen |
| Olli Rehn | Olli Rehn |
| Ollie | Ollie |
| Olmèques | Olmeker |
| Olof de Suède | Olof Skötkonung |
| Olof Palme | Olof Palme |
| Olof Peter Swartz | Olof Swartz |
| Olokun | Olokun |
| Olomouc | Olomouc |
| Olpe | Olpe |
| Olsberg | Olsberg |
| Olsen Brothers | Bröderna Olsen |
| Olsztyn | Olsztyn |
| Oltcit | Oltcit |
| Oltingen | Oltingen |
| Oluf Ier de Danemark | Olof Hunger |
| Oluf II de Danemark | Olof Haraldsson |
| Oluf III de Danemark | Olof av Danmark och Norge |
| Olusegun Obasanjo | Olusẹgun Ọbasanjọ |
| Olybrius | Olybrius |
| Olympe | Olympen |
| Olympe de Gouges | Olympe de Gouges |
| Olympe Maxime | Olympe Maxime |
| Olympia | Washington |
| Olympia Dukakis | Olympia Dukakis |
| Olympiades internationales de mathématiques | Matematikolympiaden |
| Olympiakos | Olympiakos |
| Olympiakos Le Pirée | Olympiakos |
| Olympiakos Nicosie | Olympiakos Nicosia |
| Olympiakós | Olympiakos |
| Olympias | Olympias |
| Olympic Airways | Olympic Airlines |
| Olympie | Olympia |
| olympique | olympisk |
| Olympique de Marseille | Olympique de Marseille |
| Olympique lyonnais | Olympique Lyonnais |
| Olympiques de Gatineau | Gatineau Olympiques |
| Olympos | Olympen |
| Olympus | Olympus |
| Olympus Mons | Olympus Mons |
| Oléate | Olja |
| oléoduc | ledning |
| oléographie | oljetryck |
| Omaha | Nebraska |
| Omaha Beach | Omaha Beach |
| Oman | Oman |
| Omar | Omar |
| Omar Bongo Ondimba | Omar Bongo |
| Omar Bradley | Omar Bradley |
| Omar el-Béchir | Omar Hassan al-Bashir |
| Omar ibn al-Khattab | Umar ibn al-Khattab |
| Omar Khayyam | Omar Khayyam |
| Omar Sharif | Omar Sharif |
| Omar Sivori | Omar Sivori |
| Omaruru | Omaruru |
| Ombellifères | Flockblommiga växter |
| ombilic | navel |
| omble | röding |
| Omble chevalier | Fjällröding |
| ombrager | överskugga |
| ombrageux | känslig |
