Persons O
| Orlandi, William | Person | |
| Orlando, Mariane | Person | |
| Orlando, Michele | Person | |
| Orofino, Rugiero | Person | |
| Oron, Janiv | Person | |
| Orosz, Julia | Person | |
| Orpana, Elina | Person | |
| Orpana-Martin, Eija | Person | |
| Orrain, Joonas | Person | |
| Ortola, Leena | Person | |
| Osa, Airi | Person | |
| Osadcenko, Anna | Person | |
| Osinska, Dorota | Person | |
| Otelli, Claudio | Person | |
| Otonkoski, Pirkko-Leena | Person | |
| Ots, Georg | Person | |
| Otsuka, Rumiko | Person | |
| Otto, Eugen | Person | |
| Ovsianikov, Valeri | Person | |
| Owen, Wilfred | Person |