| Climber Name | # Ascents Recorded | Notes |
|---|---|---|
| Jacques Wehrlin | 1 | |
| Jake Bresnehan | 1 | |
| Jake Croft | 1 | |
| Jake Kim | 1 | |
| Jake Mason | 1 | |
| Jake Plasco | 1 | |
| Jakub Fábric | 1 | |
| James Oswald | 1 | |
| James Thornton | 1 | |
| Jamie Cassidy | 1 | |
| Jamie Emerson | 1 | |
| Jamie Finlayson | 1 | |
| Jamie Lowther | 1 | |
| Jan Długosz | 1 | |
| Jani Lehtola | 1 | |
| Jasper Sharpe | 1 | |
| Jaszna Hodzic | 1 | |
| Javier Cano Blazquez | 1 | |
| Jean Couzy | 1 | |
| Jean-Elie Lugon | 1 |