| oiseux | zinloos |
| oisif | werkloos |
| oisillon | kuiken |
| oisive | lanterfantster |
| oisiveté | nietsdoen |
| oison | gansje |
| Oita Trinita | Oita Trinita |
| Ojén | Ojén |
| ok | prima |
| OK Go | OK Go |
| Oka | Oka |
| okapi | okapi |
| OKATO | OKATO |
| Okavango | Okavango |
| Okawville | Okawville |
| Okayama | Okayama |
| OKB | Ontwerpbureau |
| Okhotsk | Ochotsk |
| Okhrana | Ochrana |
| Okhrid | Ohrid |
| Okinawa | Okinawa |
| Okinawa Honto | Okinawa |
| Okinawa Island | Okinawa |
| Oklahoma | Oklahoma |
| Oklahoma City | Oklahoma City |
| Okondo | Okondo |
| okra | okra |
| Okroug | Okroeg |
| Oksana Akinchina | Oksana Akinsjina |
| Oksana Domnina | Oksana Domnina |
| Okubo Toshimichi | Toshimichi Ôkubo |
| Ol Doinyo Lengaï | Ol Doinyo Lengai |
| Ola | Weegschaal |
| Olaberria | Olaberria |
| Olaf Ier de Norvège | Olaf I van Noorwegen |
| Olaf II de Norvège | Olaf II van Noorwegen |
| Olaf III de Norvège | Olaf III van Noorwegen |
| Olaf IV de Norvège | Olaf Magnusson |
| Olafur Ragnar Grimsson | Ólafur Ragnar Grímsson |
| Olanzapine | Olanzapine |
| OLAP | OLAP |
| Olathe | Olathe |
| Olatzi | Olazti |
| Olaus Magnus | Olaus Magnus |
| Olav V de Norvège | Olaf V van Noorwegen |
| Olavarría | Olavarría |
| Olbernhau | Olbernhau |
| Olbia | Olbia |
| Old Boy | Oldboy |
| Old Carthusians FC | Old Carthusians FC |
| Old Etonians FC | Old Etonians FC |
| Old Faithful | Old Faithful |
| Old Firm | The Old Firm |
| Old school | Old school |
| Old Street | Station Old Street |
| Old Trafford | Old Trafford |
| Oldenbourg | Oldenburg |
| Oldenburg | Oldenburg |
| Oldham | Oldham |
| Oldham Athletic Association Football Club | Oldham Athletic AFC |
| Oldowayen | Oldowan |
| Oldsmobile | Oldsmobile |
| Ole Bull | Ole Bull |
| Ole Christensen Rømer | Ole Rømer |
| Ole Einar Bjørndalen | Ole Einar Bjørndalen |
| Ole Gunnar Solskjær | Ole Gunnar Solskjær |
| Ole Madsen | Ole Madsen |
| Oleaceae | Olijffamilie |
| Oleg Blokhine | Oleh Blochin |
| Oleg Cassini | Oleg Cassini |
| Oleg Deripaska | Oleg Deripaska |
| Oleg le Sage | Oleg van Kiev |
| Oleg Lisogor | Oleh Lisohor |
| Oleg Luzhny | Oleh Loezjny |
| Oleg Salenko | Oleg Salenko |
| Oleg Vladimirovich Losev | Oleg Vladimirovich Losev |
| Oleguer Presas | Oleguer Presas |
| Olekma | Oljokma |
| Oleksandr Moroz | Oleksandr Moroz |
| Oleksandr Shovkovskiy | Oleksandr Sjovkovskyj |
| Olenyok | Olenjok |
| Oleviste Kirik | Olafkerk |
| olfactif | olfactorisch |
