| Link | Location | |
|---|---|---|
 | Franciszek Ostrowski | Rzeszów, Poland |
 | Alberto Osuji | Lagos, Nigeria |
| Joe Oswald | Columbus, Ohio, United States |
| Yuki Otsuka | Tokyo, Japan |
| VADIM OTTO | Moscow, Russian Federation |
| kazuki ouchi | Tokyo, Japan |
| Kenichiro Ouchi | Tokyo, Japan |
| Georgi Ovcharov | Graz, Online ENGLISH, Austria |
| Anita Owczarek | Wrocław, Poland |
| Jaleeza Owens | Cottage Grove, Minnesota, United States |
| Shane Owens | London, United Kingdom |
| Shota Oyabu | Tokyo, Japan |
| Tomoko Oyama | Tokyo, Japan |
| Syohei Oyanagi | Tokyo, Japan |
| Gaspar Oyuela | Buenos Aires, Argentina |
