| okra | okra |
| Okroug | Okrug |
| Oksana Akinchina | Oksana Akinshina |
| Oksana Baiul | Oksana Baiul |
| Oksana Domnina | Oksana Domnina |
| Oksana Grishuk | Oksana Grishuk |
| Oksana Kazakova | Oksana Kazakova |
| Oksana Khvostenko | Oksana Khvostenko |
| Oktoberfest | Oktoberfest |
| Okubo Toshimichi | Ōkubo Toshimichi |
| Okurigana | Okurigana |
| OL | OL |
| Ol Doinyo Lengaï | Ol Doinyo Lengai |
| Ola | Audience wave |
| Ola Håkansson | Ola Håkansson |
| Olaberria | Olaberria |
| Olaf Gothfrithson | Olaf III Guthfrithson |
| Olaf Ier de Norvège | Olaf I of Norway |
| Olaf II de Norvège | Olaf II of Norway |
| Olaf III de Norvège | Olaf III of Norway |
| Olaf IV de Norvège | Olaf Magnusson of Norway |
| Olaf Kvaran | Olaf Cuaran |
| Olaf Kölzig | Olaf Kölzig |
| Olaf Stapledon | Olaf Stapledon |
| Olafur Ragnar Grimsson | Ólafur Ragnar Grímsson |
| Olanesti | Olanesti |
| Olanzapine | Olanzapine |
| OLAP | Online analytical processing |
| Olargues | Olargues |
| Olaus Borrichius | Ole Borch |
| Olaus Magnus | Olaus Magnus |
| Olav V de Norvège | Olav V of Norway |
| Olavarría | Olavarría Partido |
| Olbernhau | Olbernhau |
| Olbia | Olbia |
| Old Bailey | Old Bailey |
| Old Boy | Oldboy |
| Old Course | St Andrews Links |
| Old Faithful | Old Faithful Geyser |
| Old Firm | Old Firm |
| Old Friends From Young Years | Old Friends from Young Years |
| Old Goa | Goa Velha |
| Old Lyme | Old Lyme |
| Old Saybrook | Old Saybrook |
| Old Street | Old Street station |
| Old Trafford | Old Trafford |
| Old-time music | Old-time music |
| Oldenbourg | Oldenburg |
| Oldenburg | Oldenburg |
| Oldham | Oldham |
| Oldman | Oldman River |
| Oldowayen | Olduwan |
| Oldrich Duras | Oldřich Duras |
| Oldsmobile | Oldsmobile |
| Oldřich Nejedlý | Oldřich Nejedlý |
| Ole Bull | Ole Bull |
| Ole Christensen Rømer | Ole Rømer |
| Ole Einar Bjørndalen | Ole Einar Bjørndalen |
| OLE for Process Control | OLE for process control |
| Ole Gunnar Solskjær | Ole Gunnar Solskjær |
| Ole Madsen | Ole Madsen |
| Ole Worm | Ole Worm |
| Olea | Olea |
| Oleaceae | Oleaceae |
| Oleg Blokhine | Oleg Blokhin |
| Oleg Cassini | Oleg Cassini |
| Oleg Deripaska | Oleg Deripaska |
| Oleg Gordievsky | Oleg Gordievsky |
| Oleg Gusev | Oleh Husyev |
| Oleg Iourievitch Atkov | Oleg Atkov |
| Oleg Kotov | Oleg Kotov |
| Oleg Kuznetsov | Oleg Kuznetsov |
| Oleg le Sage | Oleg of Novgorod |
| Oleg Lisogor | Oleg Lisogor |
| Oleg Lundstrem | Oleg Lundstrem |
| Oleg Luzhny | Oleh Luzhny |
| Oleg Makarov | Oleg Makarov |
| Oleg Menchikov | Oleg Menshikov |
| Oleg Penkovsky | Oleg Penkovsky |
| Oleg Petrov | Oleg Petrov |
| Oleg Protasov | Oleg Protasov |
| Oleg Protopopov | Oleg Protopopov |
| Oleg Romantsev | Oleg Romantsev |
| Oleg Ryzhenkov | Oleg Ryzhenkov |
| Oleg Salenko | Oleg Salenko |
| Oleg Serebrian | Oleg Serebrian |
| Oleg Shelayev | Oleh Shelayev |
| Oleg Taktarov | Oleg Taktarov |
| Oleg Vladimirovich Losev | Oleg Losev |
| Oleguer Presas | Oleguer Presas |
| Olekma | Olyokma River |
| Oleksandr Moroz | Oleksandr Moroz |
| Oleksandr Shovkovskiy | Oleksandr Shovkovskiy |
| Oleksandr Yatsenko | Oleksandr Yatsenko |
| Oleksiy Lukashevych | Olexiy Lukashevych |
| Olena Petrova | Olena Petrova |
| Olena Zubrilova | Olena Zubrilova |
| Olenyok | Olenyok River |
| Olesya Krasnomovets | Olesya Krasnomovets |
| Olesya Zykina | Olesya Zykina |
| Olexiy Byelik | Oleksiy Byelik |
| olfactif | olfactory |
| Olga Alexandrovna | Grand Duchess Olga Alexandrovna of Russia |
| Olga Alexandrovna de Russie | Grand Duchess Olga Alexandrovna of Russia |
| Olga Artechina | Olga Arteshina |
| Olga Bancic | Olga Bancic |
| Olga Bondarenko | Olga Bondarenko |
| Olga Bryzgina | Olga Bryzgina |
| Olga Constantinovna de Russie | Olga Konstantinovna of Russia |
| Olga Danilova | Olga Danilova |
| Olga de Russie | Grand Duchess Olga of Russia |
| Olga Fikotová | Olga Fikotová |
| Olga Karnovic Paley | Olga Valerianovna Paley |
| Olga Kern | Olga Kern |
| Olga Khokhlova | Olga Khokhlova |
| Olga Korbut | Olga Korbut |
| Olga Kotlyarova | Olga Kotlyarova |
| Olga Kuzenkova | Olga Kuzenkova |
| Olga Mineyeva | Olga Mineyeva |
| Olga Morozova | Olga Morozova |
| Olga Nazarova | Olga Nazarova |
| Olga Neuwirth | Olga Neuwirth |
| Olga Nicolaevna de Russie | Grand Duchess Olga Nikolaevna of Russia |
| Olga Nicolaïevna de Russie | Olga Nikolaevna of Russia |
| Olga Poutchkova | Olga Poutchkova |
| Olga Prekrasa | Olga of Kiev |
| Olga Preobrajenska | Olga Preobrajenska |
| Olga Pyleva | Olga Pyleva |
| Olga Rubtsova | Olga Rubtsova |
| Olga Ryabinkina | Olga Ryabinkina |
| Olga Samaroff | Olga Samaroff |
| Olga Savialova | Olga Zavyalova |
| Olga Savtchouk | Olga Savchuk |
| Olga Schischigina | Olga Shishigina |
| Olga Yegorova | Olga Yegorova |
| Olga Zaitseva | Olga Zaitseva |
| Olga Zaytseva | Olga Zaytseva |
| Olgiate Comasco | Olgiate Comasco |
| Olgierd | Algirdas |
| Olgierd Zienkiewicz | Olgierd Zienkiewicz |
| Olgoï-Khorkhoï | Mongolian Death Worm |
| Olib | Olib |
| Oliena | Oliena |
| Olifant | Olifant |
| oligarchie | oligarchy |
| oligarchique | oligarchic |
| oligo-élément | trace element |
| Oligochaeta | Oligochaeta |
| Oligocène | Oligocene |
| Oligomère | Oligomer |
| Oligonucléotide | Oligonucleotide |
| oligopole | oligopoly |
| Oligoryzomys | Pygmy rice rat |
| Oligotrophe | Oligotrophic |
| Olimpia Milan | Olimpia Milano |
| Olimpiada Ivanova | Olimpiada Ivanova |
| Olimps Riga | JFK Olimps Rīga |
| Olin Wilson | Olin Chaddock Wilson |
| Olinda | Olinda |
| Oliniaceae | Olinia |
| Oliphant | Olifant |
| olisbos | dildo |
| Oliva de Besalù | Abbot Oliva |
| olive | olive |
| olive de duffel-coat | toggle |
| Olive Oyl | Olive Oyl |
| Oliveira | Oliveira |
| Oliveira da Figueira | Minor characters in The Adventures of Tintin |
| Oliveira de Azeméis | Oliveira de Azeméis |
| Oliveira de Frades | Oliveira de Frades |
| Oliveira do Hospital | Oliveira do Hospital |
| Olivenza | Olivenza |
| Oliver Barkley | Olly Barkley |
| Oliver Bierhoff | Oliver Bierhoff |
| Oliver Cromwell | Oliver Cromwell |
| Oliver Heaviside | Oliver Heaviside |
| Oliver Hirschbiegel | Oliver Hirschbiegel |
| Oliver Kahn | Oliver Kahn |
| Oliver Kovačević | Oliver Kovačević |
| Oliver Lodge | Oliver Joseph Lodge |
| Oliver Mtukudzi | Oliver Tuku Mtukudzi |
| 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 Lufkin |
| Olivia Newton-John | Olivia Newton-John |
| Olivia Williams | Sailor Saturn |
| Olividae | Olive shell |
| olivier | olive tree |
| Olivier Besancenot | Olivier Besancenot |
| Olivier Blanchard | Olivier Blanchard |
| Olivier de la Marche | Olivier de la Marche |
| Olivier européen | Olive |
| Olivier Grouillard | Olivier Grouillard |
| Olivier IV de Clisson | Olivier de Clisson |
| Olivier Levasseur | Olivier Levasseur |
| Olivier Messiaen | Olivier Messiaen |
| Olivier odorant | Sweet Osmanthus |
| Olivier Panis | Olivier Panis |
| Olivier Plunket | Oliver Plunkett |
| Olivier Schoenfelder | Olivier Schoenfelder |
| Olivier V de Clisson | Olivier de Clisson |
| Olivier van Noort | Olivier van Noort |
| Olivine | Olivine |
| olivâtre | sallow |
| Olkiluoto | Olkiluoto Nuclear Power Plant |
| Ollantaytambo | Ollantaytambo |
| Ollastra | Ollastra Simaxis |
| Olli Jokinen | Olli Jokinen |
| Olli Rehn | Olli Rehn |
| Olli Remes | Olli Remes |
| Ollie | Ollie |
| Olliergues | Olliergues |
| Ollon | Ollon |
| Olmstead Falls | Olmstead Falls |
| Olmèques | Olmec |
| Olof de Suède | Olof Skötkonung |
| Olof Palme | Olof Palme |
| Olof Peter Swartz | Olof Swartz |
| Olof Rudbeck | Olaus Rudbeck |
| Olof Rudbeck le Jeune | Olof Rudbeck the Younger |
