| Grimpeurs | Nationalité | Nb de voies |
| Pablo Ochoa | 1 | |
| Kinga Ociepka-Grzegulska | 1 | |
| 19 | ||
| Roch Oddo | 1 | |
| Thomas O'Halloran | 6 | |
| Tomasz Oleksy | 1 | |
| José Luis Olivares Ferrandiz | 1 | |
| Samuel Ometz | 10 | |
| 224 | ||
| Iker Ortiz | 2 | |
| 4 | ||
| Graham Owens | 1 |