| Name | Nation |
|---|---|
| O'Bee, Kirk | USA |
| O'Grady, Stuart | AUS |
| O'Neill, Nathan | AUS |
| Oarbeascoa Ispizua, Ruben | ESP |
| Obwaller, Hans Peter | AUT |
| Odriozola Mugarza, Jon | ESP |
| Olano Manzano, Abraham | ESP |
| Olejnik, Mickael | POL |
| Oliveira, Ruben Fernandez | ESP |
| Olivier, Lénaïc | FRA |
| Olson, Aaron | USA |
| Olsson, Jonas | SWE |
| Omloop, Wim | BEL |
| Omloop, Geert | BEL |
| Ongarato, Alberto | ITA |
| Ordonez Citoula, Fernando | ESP |
| Ordowski, Volker | GER |
| Oriol, Christophe | FRA |
| Ortenzi, Gian Mario | ITA |
| Ortiz, Garikoitz | ESP |
| Orvalho, David | NED |
| Osa Eizaguirre, Aitor | ESP |
| Osa Eizaguirre, Unai | ESP |
| Osorio, Carlos Andres | COL |
| Otero Gomez, Gustavo Miguel | ESP |
| Otxoa Palacios, Javier | ESP |
| Outschakov, Serguei | UKR |
