| older | aîné |
| oldest | aîné |
| Oldfield Thomas | Michael Rogers Oldfield Thomas |
| Oldham | Oldham |
| oldish | vieillot |
| Oldly | Alto |
| Oldman River | Oldman |
| Oldowan | Oldowayen |
| Oldrich of Bohemia | Ulrich de Bohême |
| Oldsmobile | Oldsmobile |
| oldster | vieux |
| Olduwan | Oldowayen |
| Oldřich Duras | Oldrich Duras |
| Oldřich Nejedlý | Oldřich Nejedlý |
| Ole Borch | Olaus Borrichius |
| Ole Bull | Ole Bull |
| 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 Rømer | Ole Christensen Rømer |
| Ole Worm | Ole Worm |
| Olea | Olea |
| Oleaceae | Oleaceae |
| oleander | laurier-rose |
| Oleg | Oleg le Sage |
| Oleg Atkov | Oleg Iourievitch Atkov |
| Oleg Blokhin | Oleg Blokhine |
| Oleg Cassini | Oleg Cassini |
| Oleg Deripaska | Oleg Deripaska |
| Oleg Gordievsky | Oleg Gordievsky |
| Oleg Kotov | Oleg Kotov |
| Oleg Kuznetsov | Oleg Kuznetsov |
| Oleg Lisogor | Oleg Lisogor |
| Oleg Losev | Oleg Vladimirovich Losev |
| Oleg Lundstrem | Oleg Lundstrem |
| Oleg Makarov | Oleg Makarov |
| Oleg Menshikov | Oleg Menchikov |
| Oleg of Novgorod | Oleg le Sage |
| 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 Taktarov | Oleg Taktarov |
| Oleguer Presas | Oleguer Presas |
| Oleh Husyev | Oleg Gusev |
| Oleh Luzhny | Oleg Luzhny |
| Oleh Shelayev | Oleg Shelayev |
| Oleksandr Bagach | Aleksandr Bagach |
| Oleksandr Moroz | Oleksandr Moroz |
