Ordered by the number of ascents recorded.
| Climb Name | Type | Grade | # Ascents Recorded | Notes | Exclude Reason |
|---|---|---|---|---|---|
| Odins Bue | Boulder problem | 8A | 1 | ||
| Óð til Sigurs | Boulder problem | 8A+ | 1 | ||
| Off the Ground | Boulder problem | 8B | 1 | ||
| Öga för Öga | Boulder problem | 8C | 1 | ||
| Oiran | Boulder problem | 8B+ | 1 | ||
| Oksespranget | Boulder problem | 8A | 1 | ||
| Okuro | Boulder problem | 8C | 1 | ||
| Old Milwaukee | Boulder problem | 8B+ | 1 | ||
| Olion | Boulder problem | 8A+ | 1 | ||
| Onde de Choc | Boulder problem | 7B | 1 | ||
| Onde O Sol Não Toca | Boulder problem | 8B+ | 1 | ||
| One for the Road | Boulder problem | 8A+ | 1 | ||
| One Redeeming Feature | Boulder problem | 7C+ | 1 | ||
| One Step Beyond | Boulder problem | 8A+ | 1 | ||
| On The Beach | Boulder problem | 8B | 1 | ||
| Optimus Prime | Boulder problem | 8B+ | 1 | ||
| Orb Weaver | Boulder problem | 7C+ | 1 | ||
| Oreo | Boulder problem | 7C | 1 | ||
| Orgasmatron | Boulder problem | 8A | 1 | ||
| Oriflamme | Boulder problem | 7C | 1 |