| Climber Name | # Ascents Recorded | Notes |
|---|---|---|
| Jane Inglis Clark | 1 | |
| Jason Kruk | 1 | |
| Jasper Sharpe | 1 | |
| Jaszna Hodzic | 1 | |
| Javier Cano Blazquez | 1 | |
| Javier Norton | 1 | |
| Jay Hoffman | 1 | |
| Jean Couzy | 1 | |
| Jean-Elie Lugon | 1 | |
| Jean-Michel Gosselin | 1 | |
| Jean-Paul Finne | 1 | |
| Jeff Beaulieu | 1 | |
| Jeff Lowe | 1 |
American alpinist, pioneer of ice and mixed climbing, rock climber and entrepreneur. Lifetime Piolet D'Or recipient. References |
| Jemima Churchhouse | 1 | |
| Jenn DeBellis | 1 | |
| Jenny Lavarda | 1 | |
| Jeremy Holmes | 1 | |
| Jeremy Smith | 1 | |
| Jérôme Jean-Charles | 1 |
Bleausard bouldering pioneer. Chipped and climbed the first 7B in the forest Le Carnage in 1977.
In the 1980s, he climbed the entire Cuvier white circuit wearing trainers. References[1] Godoffe, J. 'Blocs en Stock: Le Cuvier', 1993 |
| Jesse Guthrie | 1 |