2020 Zomer Olympische Spelen - Atleten
| Atleet | Sport |
|---|---|
 Camila Osorio | Tennis |
 Jelena Ostapenko | Tennis |
 Anja Osterman | Canoe/Kayak |
 Karol Ostrowski | Aquatics |
 Philipp Oswald | Tennis |
 Marie Oteiza | Moderne Vijfkamp |
 Mawupemon Otogbe | Aquatics |
 Gundegmaa Otryad | Schieten |
 Payton Otterdahl | Athletiek |
 Jeanette Ottesen | Aquatics |
 Abdelkebir Ouaddar | Ruiter |
| Ludovic Ouceni | Athletiek |
 Adama Ouedraogo | Aquatics |
| Angelika Ouedraogo | Aquatics |
 Sahnoune Oussama | Aquatics |
 Mariya Ovchinnikova | Athletiek |
| Kristina Ovchinnikova | Athletiek |
 Ovez Ovezov | Gewichtheffen |
 Ryan Owens | Wielrennen |
 Shigetaka Oyama | Schieten |
| Yesugen Oyunbat | Schieten |
 Furkan Özbek | Gewichtheffen |
| Kayhan Ozer | Athletiek |
 Alisa Ozhogina | Aquatics |
| Ertan Ozkan | Athletiek |