| Fighter | Record | Last Bout |
|---|---|---|
| Ian Loveland | 18-10-0 | 2011-08-27 |
| Iasmin Lucindo | 18-6-0 | 2025-08-09 |
| Icho Larenas | 6-5-0 | 2006-03-04 |
| Ilir Latifi | 17-9-0 (1 NC) | 2023-05-20 |
| Jackie Lee | 0-1-0 | 1997-02-07 |
| Jake Lindsey | 12-7-0 | 2015-03-14 |
| James Lee | 15-3-0 (1 NC) | 2008-01-19 |
| James Llontop | 14-5-0 | 2024-11-16 |
| Jason Lambert | 26-13-0 | 2008-09-06 |
| Jean-Paul Lebosnoyani | 11-2-0 | 2026-07-18 |
| Jenel Lausa | 7-5-0 | 2018-06-23 |
| JeongYeong Lee | 11-3-0 | 2025-05-10 |
| Jeremy Larsen | 8-5-0 | 2013-10-19 |
| Jess Liaudin | 20-11-0 | 2008-10-18 |
| Jesse Lennox | 14-4-0 | 2010-06-12 |
| Joe Lauzon | 28-16-0 | 2019-10-18 |
| John Lewis | 3-4-3 | 2000-11-17 |
| John Lineker | 31-9-0 | 2019-04-27 |
| John Lober | 5-9-4 | 1998-10-16 |
| Jordan Leavitt | 13-4-0 | 2026-06-06 |
| Jorge Lopez | 11-5-0 | 2012-05-15 |
| Jovan Leka | 14-2-0 | 2026-08-01 |
| Juliana Lima | 9-5-0 | 2018-01-27 |
| Julien Leblanc | 10-3-0 | 2026-10-17 |
| Justin Lawrence | 10-4-0 | 2013-04-13 |
| Justin Ledet | 9-4-0 (1 NC) | 2020-10-31 |
| Justin Levens | 10-7-0 | 2006-06-28 |
| Kevin Lee | 18-8-0 | 2023-07-01 |
| Kimo Leopoldo | 10-7-1 | 2004-06-19 |
| Lance Benoist | 7-2-0 | 2014-06-07 |
| Lance Gibson | 4-5-0 | 2000-12-16 |
| Lance Gibson Jr. | 10-2-0 | 2026-03-28 |
| Lando Vannata | 12-8-2 | 2026-04-04 |
| Landon Quinones | 7-3-1 | 2024-02-03 |
| Lara Procopio | 7-2-0 | 2021-06-19 |
| Larissa Pacheco | 10-2-0 | 2015-03-14 |
| Larry Cureton | 0-2-0 | 1995-09-08 |
| Laureano Staropoli | 9-5-0 | 2021-10-23 |
| Lauren Mueller | 5-3-0 | 2019-10-12 |
| Lauren Murphy | 16-7-0 | 2025-07-12 |
| Lavar Johnson | 18-10-0 | 2013-02-23 |
| Laverne Clark | 27-21-1 | 2000-09-22 |
| Lawrence Lui | 8-2-0 | 2026-08-29 |
| Leah Letson | 5-3-0 | 2021-11-13 |
| Leandro Issa | 13-6-0 | 2016-09-03 |
| Leandro Silva | 20-6-1 (1 NC) | 2016-09-03 |
| Lee Murray | 8-2-1 (1 NC) | 2004-01-31 |
| Leigh Remedios | 18-10-2 | 2002-07-13 |
| Leo Kuntz | 18-4-1 | 2015-11-28 |
| Leon Edwards | 22-6-0 (1 NC) | 2025-11-15 |