Persons O
| Okada, Toru | Person | |
| Okkonen, Jukka | Person | |
| Oksanen, Petteri | Person | |
| Oksanen, Riikka | Person | |
| Oksanen, Sofi | Person | |
| Okunev, Vyacheslav | Person | |
| Olczyk, Aleksandra | Person | |
| Olin, Berndt | Person | |
| Oliva, Domenico | Person | |
| Oliveira, Cristiana | Person | |
| Olivera, Alejandro | Person | |
| Olizeg, Grischa | Person | |
| Olli, Kalevi | Person | |
| Ollikainen, Eva | Person | |
| Ollikkala, Oiva | Person | |
| Ollila, Jussi | Person | |
| Ollila, Kaarina | Person | |
| Ollila, Meri | Person | |
| Ollila, Mira | Person | |
| Ollila, Tuomas | Person |