| Link | Location |
|---|
| Toshihiro Ono | Tokyo, Japan |
| Glenn Onos | Matthews, North Carolina, United States |
| Ronald Oomen | Deventer, Netherlands |
| Martijn Oost | Brussels, Belgium |
| Erik Oosterhuis | Bergschenhoek, Netherlands |
| Frey Oosterlinck | Harelbeke, Belgium |
| Albert Oosthuizen | Johannesburg, South Africa |
| Piotr Opalacz | Kraków, Poland |
| Pavel Oparin | Almaty, Kazakhstan |
| Yulia Openysheva | Moscow online, Russian Federation |
| Douglas Opfer | Houston, Texas, United States |
| Bas Opgelder | Hoofddorp, Netherlands |
| Heino Ophey | Karlsruhe, Germany |
| Luca Oppedisano | Turin, Italy |
| Thomas Oppermann | Berlin, Germany |
