Olimpiadas de Verano 2020 - Deportistas
| Deportista | Deporte |
|---|---|
 Marc-Antoine Olivier | Aquatics |
 Linda Olivieri | Atletismo |
| Angelica Olmo | Triatlón |
 Giuliana Olmos | Tenis |
 Steffen Olsen | Tiro |
| Marie Thusgaard Olsen | Vela |
 Shallon Olsen | Gimnasia |
 Josefin Olsson | Vela |
| Osmar Olvera Ibarra | Aquatics |
 Lyudmila Olyanovska | Atletismo |
| Orlann Ombissa Dzangue | Atletismo |
| Oleh Omelchuk | Tiro |
 Rika Omoto | Aquatics |
 Knowledge Omovoh | |
 Ferdinand Omanyala Omurwa | Atletismo |
 Ahmet Önder | Gimnasia |
| Chiara Ondoli | Remo |
 Adam Ondra | Escalada Deportiva |
 Imke Onnen | Atletismo |
| Yuka Ono | Canoe/Kayak |
 Himeka Onoda | Gimnasia |
| Viktoriia Onopriienko | Gimnasia |
| Chioma Onyekwere | |
 Emma Oosterwegel | Atletismo |
| Hanneke Oosterwegel |