| Name | Nation |
|---|---|
| O'Bee, Kirk | USA |
| O'Grady, Stuart | AUS |
| O'Neill, Nathan | AUS |
| Oarbeascoa Ispizua, Ruben | ESP |
| Obst, René | GER |
| Obwaller, Hans Peter | AUT |
| Odebrecht, Felix | GER |
| Odriozola Mugarza, Jon | ESP |
| Oegema, Bart | NED |
| Oeschger, Peter | SUI |
| Ojavee, Mart | EST |
| Okazaki, Kazuya | JPN |
| Okrucinski, Daniel | POL |
| Olde Dubbelink, Peter | NED |
| Olejnik, Michal | POL |
| Olivier, Lénaïc | FRA |
| Ollerenshaw, Doug | USA |
| Olmo Menacho, Juan | ESP |
| Olmo Menacho, Antonio | ESP |
| Olsen, Jack | DEN |
| Olsen, Nicki Hjort | DEN |
| Olsen, Mike | DEN |
| Olson, Aaron | USA |
| Olszewski, Daniel | GER |
| Omloop, Geert | BEL |
| Ongarato, Alberto | ITA |
| Oouchi, Kaoru | JPN |
| Ordowski, Volker | GER |
| Orehek, Edo | SLO |
| Oriol, Christophe | FRA |
| Ormaetxea, Jokin | ESP |
| Osa Eizaguirre, Aitor | ESP |
| Osa Eizaguirre, Unai | ESP |
| Osinski, Marcin | POL |
| Ospinoa, Enrique | COL |
| Otto, Ronald | GER |
| Oushmaev, Roman | RUS |
| Owczarek, Tomasz | POL |
| Owczarek, Jonas | GER |
