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|
Country | Sports | |
| O' Donnell, Eric | AUS | American Football | |
| O'Donnell, Jessica | USA | Powerlifting | |
| O'Pray, Jason | AUS | Life Saving | |
| Obad, Mario | CRO | Handball | |
| Obama, Yuki | JPN | Sumo | |
| Ocheretianyi, Anton | UKR | Dragon Boat Race | |
| Ocheretyanyy, Igor | UKR | Dragon Boat Race | |
| Ochoa, Ruben | MEX | Field Archery | |
| Octobre, Sandino | FRA | American Football | |
| Odagiri, Sakae | JPN | Casting | |
| Odenthal, David | GER | American Football | |
| Ohman, Christer | SWE | Tug of War | |
| Oishi, Eric | BRA | Powerlifting | |
| Ojeda, Raquel | ESP | Sports Aerobic | |
| Okada, Masato | JPN | Flying Disc | |
| Okazaki, Yoko | JPN | Air Sports | |
| Oksanen, Jenni | FIN | Flying Disc | |
| Okuzono, Yuki | JPN | Rugby | |
| Olding, Rachel | GBR | Korfball | |
| Olesen, Anne Konring | DEN | Orienteering | |
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