| Link | Location |
|---|
| Gabriela Oprea | Bucharest, Romania |
| Robert-Jan Opschoor | Den Haag, Netherlands |
| Adam Or | Hong Kong, Hong Kong |
| Alina Orasanu | Munich, Germany |
| Jouko Orava | Vaasa, Finland |
| Marta Orbitowska | Szczecin, Poland |
| Andrés Orduz | Brussels, Belgium |
| Miriam Orejana | Madrid, Spain |
| Diego Oreona | A Coruña, Spain |
| Shawna Organisciak | Denver, Colorado, United States |
| Cherukei Orianwo | London, United Kingdom |
| Vadim Orlov | Moscow, Russian Federation |
| Dominic Orme | Burgess Hill, United Kingdom |
| Ryan Orndorf | Minneapolis-United Health, Minnesota, United States |
| Christoph Ornth | München, Germany |
