| Olaf Kölzig | Olaf Kölzig |
| Olaf Stapledon | Olaf Stapledon |
| Olaibar | Oláibar |
| Olanda | Hollande |
| Olanda Meridionale | Hollande-Méridionale |
| Olanda Settentrionale | Hollande-Septentrionale |
| olandese | flamand |
| olandese volante | Hollandais volant |
| olandesi | hollandais |
| Olanesti | Olanesti |
| Olanzapina | Olanzapine |
| Olao Magno | Olaus Magnus |
| OLAP | OLAP |
| Olargues | Olargues |
| Olaus Rudbeck | Olof Rudbeck |
| Olaus Rudbeck il Giovane | Olof Rudbeck le Jeune |
| Olav II di Norvegia | Olaf II de Norvège |
| Olav V di Norvegia | Olav V de Norvège |
| Olazagutía | Olatzi |
| Olbernhau | Olbernhau |
| Olbia | Olbia |
| Old Boy | Old Boy |
| Old Faithful | Old Faithful |
| Old Firm | Old Firm |
| Old Friends from Young Years | Old Friends From Young Years |
| 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 |
