| Climber Name | # Ascents Recorded | Notes |
|---|---|---|
| Jakob Toft Pedersen | 1 | |
| Jakub Fábric | 1 | |
| James Dazhong Cook | 1 | |
| James Oswald | 1 | |
| James Thornton | 1 | |
| Jamie Cassidy | 1 | |
| Jamie Emerson | 1 |
References |
| Jamie Jenkins | 1 | |
| Jan Długosz | 1 | |
| 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-Marc Troussier | 1 | |
| Jean-Michel Gosselin | 1 |