| Link | Location |
|---|
 | Svein Olsen | Oslo, Norway |
| Malte Olsson | Hamburg, Germany |
| Joanna Olszewska | Poznań, Poland |
| Grzegorz Olszewski | Krakow, Poland |
| Łukasz Olszewski | Mikolow, Poland |
| Kamil Olszynski | Prague, Czechia |
| John Magnar Olufsen | Oslo, Norway |
| Victor Omarkov | Almaty, Kazakhstan |
| omatyushenko omatyushenko | Moscow, Russian Federation |
| Bert Omlo | Elst GLD, Netherlands |
| Adlemi-Shell Onas | Manila, Philippines |
 | Michal Ondráček | Brno, Czechia |
| Jennifer Oneill | New York, New York, United States |
| Joe ONeill | Savage, Minnesota, United States |
| Clement Ong | Singapore, Singapore |
