| Name | Nation |
|---|---|
| O'Brien, Mark | AUS |
| O'Callaghan, Shaun | AUS |
| Obaid, Tariq | UAE |
| Obando Brenes, Gregory | CRC |
| Ocanha, Gianluca | SUI |
| Ochoa, Diego | COL |
| Ochoa, Carlos José | VEN |
| Ockeloen, Jasper | NED |
| Ockerby, Luke | AUS |
| Oelerich, Jan | GER |
| Offredo, Yoann | FRA |
| Okishev, Viktor | KAZ |
| Okrouhlicky, Tomas | CZE |
| Okubo, Jin | JPN |
| Olesen, Patrick | DEN |
| Olheiser, Mike | USA |
| Oliphant, Evan | GBR |
| Oliveira Figueiredo, Frederico José | POR |
| Olivier, Daan | NED |
| Ollegaard, Morten | DEN |
| Olsen, Martin | NOR |
| Olsson, Michael | SWE |
| Onaka, Kohki | JPN |
| Ongena, Matthias | BEL |
| Ongena, Thomas | BEL |
| Onsow, David | CAN |
| Oomen, Sam | NED |
| Opie, Chris | GBR |
| Oram, James | NZL |
| Oranza, Ronald | PHI |
| Orbe Urrutia, Haritz | ESP |
| Orjuela Gutierrez, Fernando | COL |
| Örken, Ahmet | TUR |
| Oroz Ugalde, Juan Jose | ESP |
| Orset, Jonas | NOR |
| Osorio Arboleda, Juan Felipe | COL |
| Oss, Daniel | ITA |
| Othman, Muhamad Adiq Husainie | MAS |
| Otonicar, Martin | SLO |
| Ottema, Rick | NED |
| Ovechkin, Artem | RUS |
| Owsian, Lukasz | POL |
| Owsian, Arakdiusz | POL |
| Oyarzun Guinez, Carlos Ivan | CHI |
