| Fighter | Record | Last Bout |
|---|---|---|
| Henry Martinez | 9-4-0 | 2012-12-08 |
| Herbert Burns | 11-6-0 | 2024-08-17 |
| Hermes Franca | 24-17-0 (1 NC) | 2009-09-19 |
| Hernani Perpetuo | 18-5-0 (1 NC) | 2014-07-26 |
| Holly Holm | 15-7-0 (1 NC) | 2024-04-13 |
| Homer Moore | 26-9-2 | 2001-11-02 |
| Horacio Gutierrez | 4-3-0 | 2016-08-06 |
| Houston Alexander | 17-15-1 (2 NC) | 2009-12-05 |
| Houston Dorr | 1-2-0 | 1997-10-17 |
| Hu Yaozong | 3-3-0 | 2021-10-30 |
| Hugo Duarte | 6-3-0 | 1998-05-15 |
| Hugo Viana | 8-4-0 | 2015-08-01 |
| Humberto Bandenay | 14-7-0 (1 NC) | 2019-08-10 |
| Humberto Brown Morrison | 4-6-0 | 2014-11-15 |
| Hunter Azure | 9-2-0 | 2021-04-10 |
| Hyder Amil | 11-3-0 | 2026-06-20 |
| Hyun Gyu Lim | 13-7-1 | 2017-09-22 |
| HyunSung Park | 10-2-0 | 2025-10-18 |
| Ian Entwistle | 9-3-0 | 2016-04-10 |
| Ian Freeman | 20-7-1 | 2003-06-06 |
| Ian Heinisch | 14-5-0 | 2021-07-24 |
| Ian Loveland | 18-10-0 | 2011-08-27 |
| Ian Machado Garry | 17-2-0 | 2026-08-15 |
| Ian McCall | 13-5-1 | 2015-01-31 |
| Iasmin Lucindo | 18-6-0 | 2025-08-09 |
| Ibo Aslan | 14-4-0 | 2025-12-06 |
| Icho Larenas | 6-5-0 | 2006-03-04 |
| Ignacio Bahamondes | 17-7-0 | 2026-09-12 |
| Igor Araujo | 25-9-0 (1 NC) | 2015-07-15 |
| Igor Pokrajac | 28-13-0 (1 NC) | 2016-04-10 |
| Igor Severino | 8-1-0 | 2024-03-23 |
| Igor Zinoviev | 4-1-2 | 1998-03-13 |
| Ihor Potieria | 20-8-0 | 2025-01-11 |
| Ike Villanueva | 18-14-0 | 2022-04-23 |
| Ikram Aliskerov | 18-2-0 | 2026-06-27 |
| Ikuhisa Minowa | 60-42-8 | 2000-04-14 |
| Ildemar Alcantara | 21-11-0 | 2015-07-15 |
| Ilia Topuria | 17-1-0 | 2026-06-14 |
| Iliarde Santos | 30-13-1 (1 NC) | 2013-10-09 |
| Ilimbek Akylbek Uulu | 10-3-0 | 2026-09-26 |
| Ilir Latifi | 17-9-0 (1 NC) | 2023-05-20 |
| Imanol Rodriguez | 7-0-0 | 2026-10-03 |
| Impa Kasanganay | 9-2-0 | 2021-09-18 |
| 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 |
| Irwin Rivera | 10-6-0 | 2020-09-19 |
| Isaac Dulgarian | 7-2-0 | 2025-11-01 |
| Isaac Thomson | 9-3-0 | 2025-12-13 |
| Isaac Vallie-Flagg | 16-7-1 | 2014-11-22 |