| Old Lyme | Old Lyme |
| Old Saybrook | Old Saybrook |
| Old School | Back to School |
| Old school hip hop | Rap old school |
| Old Trafford | Old Trafford |
| Oldenburg | Oldenbourg |
| Oldham | Oldham |
| Oldman | Oldman |
| OLE | OLE |
| OLE Control eXtension | OCX |
| Ole Einar Bjørndalen | Ole Einar Bjørndalen |
| Ole Gunnar Solskjær | Ole Gunnar Solskjær |
| Ole Rømer | Ole Christensen Rømer |
| Olea europaea | Olivier |
| Oleaceae | Oleaceae |
| oleandro | laurier-rose |
| oleandro fiorito | épilobe |
| oleare | graisser |
| oleatore | burette |
| OLED | Diode électroluminescente organique |
| Oleg Blochin | Oleg Blokhine |
| Oleg Deripaska | Oleg Deripaska |
| Oleg di Kiev | Oleg le Sage |
| Oleg Gusev | Oleg Gusev |
| Oleg Kotov | Oleg Kotov |
| Oleg Lisogor | Oleg Lisogor |
| Oleg Lužnij | Oleg Luzhny |
| Oleg Petrov | Oleg Petrov |
| Oleg Romancev | Oleg Romantsev |
| Oleg Salenko | Oleg Salenko |
| Oleg Serebrian | Oleg Serebrian |
| Oleg Vladimirovich Losev | Oleg Vladimirovich Losev |
| Oleguer Presas | Oleguer Presas |
| Oleh Husyev | Oleg Gusev |
| Oleico | Oléique |
| Oleksandr Dovzenko | Alexandre Dovjenko |
| Oleksandr Moroz | Oleksandr Moroz |
| Oleksandr Shovkovskiy | Oleksandr Shovkovskiy |
| Oleksandr Šovkovskij | Oleksandr Shovkovskiy |
| Oleksij Belik | Olexiy Byelik |
| Oleksij Michajličenko | Alexeï Mikhaïlitchenko |
| Oleksiy Byelik | Olexiy Byelik |
| Olena Zubrilova | Olena Zubrilova |
| oleodotto | oléoduc |
| Oleodotto Baku-Tbilisi-Ceyhan | Oléoduc Bakou-Tbilissi-Ceyhan |
| oleografia | oléographie |
| oleoso | huileux |
| olfattivo | olfactif |
| olfatto | odorat |
| olfattorio | olfactif |
| Olga | Olga |
| Olga Arteshina | Olga Artechina |
| Olga di Kiev | Olga Prekrasa |
| Olga Korbut | Olga Korbut |
| Olga Nikolaevna Romanova | Olga Nicolaevna de Russie |
| Olgiate Comasco | Olgiate Comasco |
| oliata | huilage |
| oliatore | graisseur |
| oliatura | huilage |
| olibano | encens |
| Oliena | Oliena |
| oliera | huilier |
| Olifante | Mûmak |
| oligarchia | oligarchie |
| oligarchico | oligarchique |
| Oligocene | Oligocène |
| Oligochaeta | Oligochaeta |
| oligoelemento | oligo-élément |
| Oligomero | Oligomère |
