| Fighter | Record | Last Bout |
|---|---|---|
| Ronnie Lawrence | 8-2-0 (1 NC) | 2023-06-17 |
| Ryan LaFlare | 14-3-0 | 2018-10-06 |
| Ryan Loder | 8-3-0 | 2025-11-22 |
| Santiago Luna | 8-1-0 | 2026-06-06 |
| Sione Latu | 1-0-0 | 1999-03-05 |
| Stephanie Luciano | 8-2-1 | 2026-08-01 |
| Steve Lopez | 13-6-1 | 2010-09-25 |
| Stevie Lynch | 5-2-0 | 2007-06-16 |
| TJ Laramie | 12-5-0 | 2022-04-16 |
| Tainara Lisboa | 7-4-0 | 2026-10-31 |
| Taylor Lapilus | 21-4-0 | 2024-09-28 |
| Thaddeus Luster | 0-1-0 | 1994-03-11 |
| Thales Leites | 28-9-0 | 2018-09-22 |
| Tim Lajcik | 7-6-1 | 2000-09-22 |
| Tina Lahdemaki | 5-1-0 | 2014-07-16 |
| Tom Lawlor | 10-6-0 (1 NC) | 2016-03-05 |
| Travis Lutter | 10-6-0 | 2008-04-19 |
| Tucker Lutz | 12-4-0 | 2023-07-15 |
| Valerie Letourneau | 8-6-0 | 2016-12-10 |
| Valmir Lazaro | 15-5-0 | 2015-11-21 |
| Vaughan Lee | 14-13-1 | 2015-07-18 |
| Vicente Luque | 24-13-1 | 2026-08-15 |
| Victoria Leonardo | 9-7-0 | 2024-08-24 |
| Waylon Lowe | 16-7-0 (2 NC) | 2011-03-26 |
| Xiao Long | 27-12-0 | 2026-08-29 |
| YiSak Lee | 8-2-0 | 2026-05-30 |
| Yohan Lainesse | 9-3-0 | 2024-01-20 |
| Zach Light | 9-11-0 | 2002-06-22 |
| Zhang Lipeng | 23-9-1 | 2015-05-16 |
| Zviad Lazishvili | 13-1-0 | 2021-10-23 |