| Climb Name | Type | Grade | # Ascents Recorded | Notes | Exclude Reason |
|---|---|---|---|---|---|
| Ödmjuk | Boulder problem | 8B | 1 | Sweden |
|
| Odysseus | Sport route | 8b | 1 | ||
| Offspring | Trad climb | E5 | 1 | ||
| Off the Ground | Boulder problem | 8B | 1 | ||
| Off the Mark | Trad climb | E7 | 1 | ||
| Øgletryne | Sport route | 8a | 1 | Bergen, Norway |
|
| Ogwen Crack | Trad climb | E7 | 1 | ||
| Oh Saint Léger Fait Moi Monter au Relais | Sport route | 8a+ | 1 | ||
| Okachi | Sport route | 9a+ | 1 | ||
| Oksespranget | Boulder problem | 8A | 1 | Norway |
|
| Okuro | Boulder problem | 8C | 1 | ||
| Old Boy Racer | Trad climb | E8 | 1 | ||
| Old Friends | Trad climb | E4 | 1 | ||
| Old Milwaukee | Boulder problem | 8B+ | 1 | ||
| Onde de Choc | Boulder problem | 7B | 1 | ||
| One 'ard Move | Trad climb | E6 | 1 | ||
| One Hundred Years of Solitude | Trad climb | E8 | 1 | ||
| One Inch Punch | Trad climb | E9 | 1 | ||
| One Night Stand | Sport route | 8c+ | 1 | ||
| One Redeeming Feature | Boulder problem | 7C+ | 1 |