| Link | Location |
|---|
 | Piotr Osinski | Munich, Germany |
 | Inga Osovsky | New York, New York, United States |
| Martin Osovsky | Prague, Czechia |
 | Josip Osrečki | Zagreb, Croatia |
 | John Ossendorp | Nieuwegein, Netherlands |
| Jenny Ossmann | Munich, Germany |
| Vladimir Ostapenko | Minsk, Belarus |
 | Bart Oste | Brussels, Belgium |
| Jens Ostergaard | Orlando, Florida, United States |
| Darcy Osterhaus | Hartford, Connecticut, United States |
 | Steve Ostermiller | Saratoga Springs, Utah, United States |
 | Alberto Osuji | Lagos, Nigeria |
| Christian Osvald | Singapore, Singapore |
| Kaiichiro Ota | Ibaraki, Osaka, Japan |
| Olga Otorowska | Krakow, Poland |
