2016 Zomer Olympische Spelen - Atleten
| Atleet | Sport |
|---|---|
 Mauricio Ortega | Athletiek |
 Florian Orth | Athletiek |
 Mirna Ortiz | Athletiek |
 Idalys Ortiz | Judo |
 Bruno Ortiz-Cañavate | Aquatics |
| Miguel Ortiz-Cañavate | Aquatics |
 Genevieve Orton | Canoe/Kayak |
 Rustam Orujov | Judo |
 Suguru Osako | Athletiek |
 Uhunoma Osazuwa | Athletiek |
| Agnes Osazuwa | Athletiek |
| Jason Osborne | Roeien |
 Dmytro Oseledets | Aquatics |
| Funke Oshonaike | Tafeltennis |
 Shelayna Oskan-Clarke | Athletiek |
 Farida Osman | Aquatics |
 Abrar Osman | Athletiek |
| Seref Osmanoglu | Athletiek |
 Jelena Ostapenko | Tennis |
 Luis Ostos Cruz | Athletiek |
| Inna Osypenko | Canoe/Kayak |
| Yuki Ota | Schermen |
| Shinobu Ota | Worstelen |
 Uuganbaatar Otgonbaatar | Judo |
| Dorjnyambuu Otgondalai | Boksen |