| oleandro fiorito | willow herb |
| oleare | oil |
| oleato | oil |
| oleatore | oilcan |
| OLED | Organic light-emitting diode |
| Oleg Blochin | Oleg Blokhin |
| Oleg Deripaska | Oleg Deripaska |
| Oleg di Kiev | Oleg of Novgorod |
| Oleg Gusev | Oleh Husyev |
| Oleg Konstantinovič Antonov | Oleg Antonov |
| Oleg Kotov | Oleg Kotov |
| Oleg Lisogor | Oleg Lisogor |
| Oleg Lužnij | Oleh Luzhny |
| Oleg Petrov | Oleg Petrov |
| Oleg Romancev | Oleg Romantsev |
| Oleg Salenko | Oleg Salenko |
| Oleg Serebrian | Oleg Serebrian |
| Oleg Vladimirovich Losev | Oleg Losev |
| Oleguer Presas | Oleguer Presas |
| Oleh Husyev | Oleh Husyev |
| Oleksandr Dovzenko | Alexander Dovzhenko |
| Oleksandr Gladkij | Oleksandr Hladky |
| Oleksandr Moroz | Oleksandr Moroz |
| Oleksandr Shovkovskiy | Oleksandr Shovkovskiy |
| Oleksandr Šovkovskij | Oleksandr Shovkovskiy |
| Oleksij Belik | Oleksiy Byelik |
| Oleksij Michajličenko | Alexei Mikhailichenko |
| Oleksiy Byelik | Oleksiy Byelik |
| Olena Zubrilova | Olena Zubrilova |
| Olenia | Olenia |
| oleodotto | oil pipeline |
| Oleodotto Baku-Tbilisi-Ceyhan | Baku-Tbilisi-Ceyhan pipeline |
| oleografia | oleograph |
| oleoso | oily |
| Olestra | Olestra |
| Oleum | Oleum |
