| Bibno. | Participant | Category | Country | Distance |
|---|---|---|---|---|
| 35 | James Williamson | (M) Veteran 40 |  | Triathlon |
| 617 | Jan Wischhusen | (F) Veteran 60 | | 5k |
| 639 | Jane Catherine Rojo | (F) Senior | | 5k |
| 612 | Janet Johnston | (F) Veteran 50 | | 5k |
| 68 | Janine Mendham | (F) Veteran 60 | | Triathlon |
| 756 | Jarek Dudek | (M) Senior | | 10k |
| 27 | Jason Etherton | (M) Veteran 40 | | Triathlon |
| 409 | Jasper Hajonides Van Der Meulen | (M) Senior | | Oxford vs Cambridge |
| 752 | Jean-pierre Gauci | (M) Senior | | 10k |
| 209 | Jen Gallagher | (F) Senior | | Triathlon |
| 781 | Jenan Ashoor | (F) Senior | | 10k |
| 364 | Jennifer Kingham | (F) Veteran 50 | | Triathlon |
| 614 | Jennifer Nineham | (F) Senior | | 5k |
| 158 | Jerry Lawson | (M) Veteran 40 | | Triathlon |
| 223 | Jessica Gill | (F) Senior | | Triathlon |
| 408 | Jessica Macdonald | (F) Senior | | Oxford vs Cambridge |
| 636 | Jim Arora | (M) Veteran 40 | | 5k |
| 652 | Jim Davies | (M) Veteran 40 | | 5k |
| 58 | Jim Harris-evans | (M) Senior | | Triathlon |
| 769 | Jo Kent | (F) Veteran 40 | | 10k |
| 363 | Jo Locker | (F) Veteran 40 | | Triathlon |
| 829 | Joanna Teixeira | (F) Senior | | 5k |
| 78 | Joanne Reynolds | (F) Senior | | Triathlon |
| 45 | Joanne Trobe | (F) Senior | | Triathlon |
| 644 | Joao Monteiro | (M) Senior | | 5k |
| 37 | Jodi Anderson | (F) Senior | | Triathlon |
| 413 | Joe Bowness | (M) Senior | | Oxford vs Cambridge |
| 418 | Johan Henriksson | (M) Senior | | Oxford vs Cambridge |
| 294 | Johanna Rigolot | (F) Senior | | Triathlon |
| 743 | John Allen | (M) Veteran 50 | | 10k |
| 749 | John Boddington | (M) Veteran 40 | | 10k |
| 297 | John Finn | (M) U20 | | Triathlon |
| 438 | John Gardner | (M) Senior | | Oxford vs Cambridge |
| 4 | John Heasman | (M) Veteran 50 | | Triathlon |
| 183 | John Jarman | (M) Senior | | Triathlon |
| 400 | John Perry | (M) Senior | | Oxford vs Cambridge |
| 446 | Jon Connolly | (M) Senior | | Oxford vs Cambridge |
| 147 | Jon Stevens | (M) Senior | | Triathlon |
| 236 | Jonathan Chadwick | (M) Veteran 50 | | Triathlon |
| 794 | Jonathan Christopher | (M) Veteran 40 | | 10k |
| 97 | Jonathan Ingram | (M) Veteran 40 | | Triathlon |
| 443 | Jonathan Martin | (M) Senior | | Oxford vs Cambridge |
| 329 | Jordan Simmons | (M) Senior | | Triathlon |
| 390 | Jordan Thornton | (M) Senior | | Oxford vs Cambridge |
| 401 | Josh Grantham | (M) Senior | | Oxford vs Cambridge |
| 767 | Juan Carlos Murray | (M) Veteran 40 | | 10k |
| 333 | Jude Thuo | (M) U20 | | Triathlon |
| 773 | Julian Howard | (M) Veteran 40 | | 10k |
| 250 | Julie Davis | (F) Veteran 40 | | Triathlon |
| 110 | Justin Armstrong | (M) Veteran 40 | | Triathlon |
