| Climber Name | # Ascents Recorded | Notes |
|---|---|---|
| James Oswald | 1 | |
| James Thornton | 1 | |
| Jamie Cassidy | 1 | |
| Jamie Emerson | 1 | |
| Jamie Finlayson | 1 | |
| Jamie Lowther | 1 | |
| Jan Długosz | 1 | |
| Jani Lehtola | 1 | |
| Jason Kruk | 1 | |
| Jasper Sharpe | 1 | |
| Jaszna Hodzic | 1 | |
| Javier Cano Blazquez | 1 | |
| Jean Couzy | 1 | |
| Jean-Elie Lugon | 1 | |
| Jean-Marc Troussier | 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 |