| Link | Location | |
|---|---|---|
 | Delia-Alexandra OPREA | Iasi, Romania |
| Marisol Teresa Opreni | LONDON, United Kingdom |
| Keisuke Orita | Tokyo, Japan |
| Kirill Orlov | Moscow, Russia |
| Robert Orłowski | Kraków, Poland |
| Claudia Orozco-Gomez | Toulouse, France |
| Rosendo Ortiz | mexico city, Mexico |
 | Daria Osadchuk | Zhytomyr, Ukraine |
| Katsuya Osakabe | Tokyo, Japan |
| Takayasu Osamu | Tokyo, Japan |
| Kyohei Osawa | Tokyo, Japan |
| Tsukasa Osawa | Tokyo, Japan |
| Radosław Osękowski | Rzeszów, Poland |
| Kai Oshima | Tokyo, Japan |
| Pavel Osin | Moscow, Russia |
