| Fighter | Record | Last Bout |
|---|---|---|
| Ilimbek Akylbek Uulu | 10-3-0 | 2026-09-26 |
| Imanol Rodriguez | 7-0-0 | 2026-10-03 |
| Ion Cutelaba | 20-12-1 (1 NC) | 2026-06-20 |
| Irene Aldana | 15-8-0 | 2024-09-14 |
| Irina Alekseeva | 5-4-0 | 2025-10-11 |
| Isaac Dulgarian | 7-2-0 | 2025-11-01 |
| Isaac Thomson | 9-3-0 | 2025-12-13 |
| Islam Dulatov | 12-1-0 | 2025-07-19 |
| Islam Makhachev | 29-1-0 | 2026-08-15 |
| Ismael Bonfim | 20-7-0 | 2026-07-25 |
| Ismail Naurdiev | 25-8-0 | 2026-10-03 |
| Israel Adesanya | 24-6-0 | 2026-03-28 |
| Istela Nunes | 6-6-0 (1 NC) | 2025-04-05 |
| Ivan Erslan | 15-6-0 (1 NC) | 2026-05-16 |
| Ivana Petrovic | 7-3-0 | 2025-05-03 |
| Iwo Baraniewski | 9-0-0 | 2026-09-19 |
| Jack Della Maddalena | 18-4-0 | 2026-05-02 |
| Jack Hermansson | 24-10-0 | 2025-11-22 |
| Jack Jenkins | 14-5-0 | 2026-08-29 |
| Jack Shore | 17-3-0 | 2024-11-02 |
| Jackson McVey | 8-2-0 | 2026-08-22 |
| Jacob Malkoun | 10-3-0 | 2026-05-02 |
| Jacobe Smith | 12-0-0 | 2026-02-21 |
| Jacqueline Cavalcanti | 10-2-0 | 2026-05-16 |
| Jafel Filho | 17-5-0 | 2026-04-25 |
| Jai Herbert | 14-6-1 | 2026-04-18 |
| Jailton Almeida | 22-5-0 | 2026-02-07 |
| Jairzinho Rozenstruik | 15-6-0 | 2025-02-01 |
| Jake Hadley | 11-4-0 | 2024-10-19 |
| Jake Matthews | 23-8-0 | 2026-05-30 |
| Jakub Wiklacz | 18-3-2 | 2026-02-07 |
| Jalin Turner | 16-9-0 | 2026-08-15 |
| Jamahal Hill | 12-4-0 (1 NC) | 2025-06-21 |
| Jamal Pogues | 11-5-0 | 2025-02-01 |
| Jamall Emmers | 23-8-0 | 2026-08-22 |
| James Llontop | 14-5-0 | 2024-11-16 |
| Jamey-Lyn Horth | 9-3-0 | 2026-10-17 |
| Jamie Mullarkey | 18-9-0 | 2026-01-31 |
| Jamie Siraj | 14-4-0 | 2026-04-18 |
| Jan Blachowicz | 29-12-2 | 2026-08-01 |
| Jaqueline Amorim | 11-2-0 | 2026-05-30 |
| Jared Cannonier | 18-10-0 | 2026-07-18 |
| Jared Gooden | 23-10-0 | 2024-10-12 |
| Jared Gordon | 21-9-0 (1 NC) | 2026-05-09 |
| Jasmine Jasudavicius | 15-4-0 | 2026-10-17 |
| Javid Basharat | 15-2-0 (1 NC) | 2026-02-07 |
| Javier Reyes | 23-6-0 | 2026-06-27 |
| Jean Matsumoto | 18-2-0 | 2026-06-27 |
| Jean Silva | 17-3-0 | 2026-09-12 |
| Jean-Paul Lebosnoyani | 11-2-0 | 2026-07-18 |