| Name | Nation |
|---|---|
| O'Brien, Mark | AUS |
| O'Grady, Stuart | AUS |
| O'Loughlin, David | IRL |
| Oberholzer, Bernhard | SUI |
| Obkircher, Marc | AUT |
| Obkircher, Rico | AUT |
| Oborski, Dominik | POL |
| Obst, René | GER |
| Ochoa, Carlos José | VEN |
| Ockeloen, Jasper | NED |
| Odlin, Paul | NZL |
| Oeben, Patrick | GER |
| Oelerich, Jan | GER |
| Offredo, Yoann | FRA |
| Oh, Se Yong | KOR |
| Ojavee, Mart | EST |
| Okada, Hiroyuki | JPN |
| Okrouhlicky, Tomas | CZE |
| Olah, Attila | ROU |
| Olesen, Nicolaj | DEN |
| Oliphant, Evan | GBR |
| Oliveira, Helder | POR |
| Oliveira Amorim, Antonio Filipe | POR |
| Olivier, Daan | NED |
| Ollegaard, Morten | DEN |
| Olmheim, Ole Martin | NOR |
| Olsson, Michael | SWE |
| Omulec, Andrej | SLO |
| Ongarato, Alberto | ITA |
| Oostlander, Sander | NED |
| Opryshko, Oleg | UKR |
| Orengo Lopez, Pascual | ESP |
| Oronte, Emerson | USA |
| Oroz Ugalde, Juan Jose | ESP |
| Ortega Ocana, Manuel | ESP |
| Ospina Navarro, Dalivier | COL |
| Oss, Daniel | ITA |
| Ostergaard, Niki | DEN |
| Othman, Muhamad Adiq Husainie | MAS |
| Ottema, Rick | NED |
| Ovechkin, Artem | RUS |
| Oyarzun, Carlos | CHI |
| Ozcan, Huseyin | TUR |
| Özdemir, Bünyamin | TUR |
| Ozolins, Uldis | LAT |
