| Climber Name | # Ascents Recorded | Notes |
|---|---|---|
| Clemens Tritthart | 1 | |
| Clive Boulton | 1 | |
| Clothilde Morin | 1 | |
| Cole Bradburn | 1 | |
| Colin Rowe | 1 | |
| Colin Wills | 1 | |
| Connie Shang | 1 | |
| Connor Baty | 1 | |
| Connor Cliffe | 1 | |
| Conrad Caddy | 1 |
Conrad climbed Superman (8B) after only around three years of climbing. |
| Conrad Piper-Ruth | 1 | |
| Cooper Doe | 1 | |
| Coral Dawson | 1 | |
| Corentin Laporte | 1 | |
| CP Little | 1 | |
| Craig Devonshire | 1 | |
| Craig Leubben | 1 | |
| Crister Jansson | 1 | |
| Cristof Rauch | 1 | |
| Daisuke Konishi | 1 |