| Link | Location |
|---|---|
| Frey Oosterlinck | Harelbeke, Belgium |
| Albert Oosthuizen | Johannesburg, South Africa |
| Piotr Opalacz | Kraków, Poland |
| Pavel Oparin | Almaty, Kazakhstan |
| Yulia Openysheva | Moscow online, Russia |
| Douglas Opfer | Houston, Texas, United States |
| Bas Opgelder | Hoofddorp, Netherlands |
| Heino Ophey | Karlsruhe, Germany |
| Luca Oppedisano | Turin, Italy |
| Thomas Oppermann | Berlin, Germany |
| Gabriela Oprea | Bucharest, Romania |
| Robert-Jan Opschoor | Den Haag, Netherlands |
| Adam Or | Hong Kong, Hong Kong |
| Alina Orasanu | Munich, Germany |
| Jouko Orava | Vaasa, Finland |
