| Fighter | Record | Last Bout |
|---|---|---|
| Al Iaquinta | 14-7-1 | 2021-11-06 |
| Anthony Ivy | 8-4-0 | 2020-09-12 |
| Blagoy Ivanov | 19-6-0 (1 NC) | 2023-07-01 |
| Brad Imes | 13-7-0 | 2007-04-07 |
| Chris Indich | 6-4-0 | 2014-06-28 |
| Damir Ismagulov | 24-3-0 | 2023-07-01 |
| Enson Inoue | 12-8-0 | 1997-05-30 |
| Fabiano Iha | 9-5-0 | 2001-09-28 |
| Guto Inocente | 7-4-0 | 2014-11-07 |
| 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 McCall | 13-5-1 | 2015-01-31 |
| Icho Larenas | 6-5-0 | 2006-03-04 |
| 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 |
| Ike Villanueva | 18-14-0 | 2022-04-23 |
| Ikuhisa Minowa | 60-42-8 | 2000-04-14 |
| Ildemar Alcantara | 21-11-0 | 2015-07-15 |
| Iliarde Santos | 30-13-1 (1 NC) | 2013-10-09 |
| Ilir Latifi | 17-9-0 (1 NC) | 2023-05-20 |
| Impa Kasanganay | 9-2-0 | 2021-09-18 |
| Irwin Rivera | 10-6-0 | 2020-09-19 |
| Isaac Vallie-Flagg | 16-7-1 | 2014-11-22 |
| Isabela de Padua | 5-2-0 | 2019-11-16 |
| Issei Tamura | 10-8-0 | 2013-03-16 |
| Iuri Alcantara | 35-10-0 (1 NC) | 2018-08-25 |
| Ivan Jorge | 27-7-0 | 2015-07-18 |
| Ivan Menjivar | 25-12-0 | 2014-03-01 |
| Ivan Salaverry | 14-9-0 | 2008-05-24 |
| Ivan Serati | 12-4-0 | 2009-01-17 |
| Izabela Badurek | 6-3-0 | 2015-04-11 |
| James Irvin | 17-10-0 (2 NC) | 2010-08-01 |
| Khadis Ibragimov | 8-4-0 | 2020-09-26 |
| Leandro Issa | 13-6-0 | 2016-09-03 |
| Minoki Ichihara | 0-1-0 | 1994-03-11 |
| Naoki Inoue | 11-1-0 | 2018-06-23 |
| Teruto Ishihara | 10-7-2 | 2019-02-09 |
| Valeri Ignatov | 1-2-0 | 1999-09-24 |
| Wallid Ismail | 9-3-0 | 1997-02-07 |
| Yoislandy Izquierdo | 10-4-0 | 2012-07-07 |
| Zelim Imadaev | 8-3-0 | 2020-09-05 |
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