| Fighter | Record | Last Bout |
|---|---|---|
| Matt Lucas | 15-3-0 | 2011-11-12 |
| Matt Mitrione | 12-5-0 | 2016-01-17 |
| Matt Sayles | 8-4-0 | 2021-12-18 |
| Matt Schnell | 17-11-0 (1 NC) | 2026-06-06 |
| Matt Serra | 11-7-0 | 2010-09-25 |
| Matt Van Buren | 7-6-0 | 2015-01-18 |
| Matt Veach | 17-5-0 | 2010-04-10 |
| Matt Wiman | 16-10-0 | 2020-12-05 |
| Matthew Lopez | 10-4-0 | 2018-12-08 |
| Matthew Riddle | 8-3-0 (2 NC) | 2013-02-16 |
| Matthew Semelsberger | 11-8-0 | 2024-11-09 |
| Matthieu Duclos | 11-3-0 | 2026-09-05 |
| Maurice Greene | 9-7-0 | 2021-05-08 |
| Maurice Smith | 12-14-0 | 2000-11-17 |
| Mauricio Rua | 27-14-1 | 2023-01-21 |
| Mauricio Ruffy | 14-2-0 | 2026-09-19 |
| Max Gimenis | 6-2-0 | 2025-11-08 |
| Max Griffin | 20-13-0 | 2026-04-25 |
| Max Holloway | 28-9-0 | 2026-07-11 |
| Max Rohskopf | 5-1-0 | 2020-06-20 |
| Maxim Grishin | 32-10-2 | 2023-06-03 |
| Maximo Blanco | 12-8-1 (1 NC) | 2016-09-17 |
| Maycee Barber | 15-3-0 | 2026-03-28 |
| Mayra Bueno Silva | 10-7-1 (1 NC) | 2026-04-25 |
| Megan Anderson | 11-5-0 | 2021-03-06 |
| Mehdi Baghdad | 11-5-0 | 2016-07-07 |
| Mehemmedeli Osmanli | 12-1-0 | 2026-09-26 |
| Melinda Fabian | 4-4-2 | 2018-06-23 |
| Melissa Amaya | 8-0-0 | 2026-09-26 |
| Melissa Croden | 8-3-0 | 2026-10-17 |
| Melissa Gatto | 9-3-2 | 2026-04-04 |
| Melissa Martinez | 8-2-0 | 2025-07-12 |
| Melissa Mullins | 7-3-0 | 2026-06-20 |
| Melquizael Costa | 26-8-0 | 2026-05-16 |
| Melsik Baghdasaryan | 8-4-0 | 2026-06-20 |
| Melton Bowen | 0-1-0 | 1994-12-16 |
| Melvin Guillard | 32-18-2 (3 NC) | 2014-03-08 |
| Merab Dvalishvili | 21-5-0 | 2026-10-24 |
| Michael Aljarouj | 13-4-0 (2 NC) | 2026-09-05 |
| Michael Aswell Jr. | 11-5-0 | 2026-09-19 |
| Michael Bisping | 30-9-0 | 2017-11-25 |
| Michael Chandler | 23-11-0 | 2026-06-14 |
| Michael Chiesa | 20-7-0 | 2026-03-28 |
| Michael Graves | 6-0-1 | 2016-07-30 |
| Michael Johnson | 25-20-0 | 2026-03-07 |
| Michael Kuiper | 15-5-0 | 2013-10-26 |
| Michael McBride | 8-3-0 | 2017-04-22 |
| Michael McDonald | 17-4-0 | 2016-07-13 |
| Michael Morales | 19-0-0 | 2025-11-15 |
| Michael Oliveira | 10-0-0 | 2026-08-01 |