| Fighter | Record | Last Bout |
|---|---|---|
| Martin Bravo | 11-3-0 | 2019-09-21 |
| Martin Day | 8-6-0 | 2021-02-06 |
| Martin Kampmann | 20-7-0 | 2013-08-28 |
| Martin Sano | 4-3-1 | 2021-09-25 |
| Martin Svensson | 15-6-0 | 2016-02-27 |
| Marvin Eastman | 18-15-1 | 2008-06-21 |
| Maryna Moroz | 11-6-0 | 2024-03-09 |
| Masanori Kanehara | 26-12-5 | 2016-01-02 |
| Masio Fullen | 11-7-0 | 2016-01-30 |
| Masutatsu Yano | 2-4-1 | 1999-11-19 |
| Mateus Mendonca | 10-3-0 | 2024-02-24 |
| Mats Nilsson | 11-4-1 | 2015-01-03 |
| Matt Andersen | 14-8-1 | 1996-05-17 |
| Matt Arroyo | 3-3-0 | 2009-01-31 |
| Matt Bessette | 22-9-0 (1 NC) | 2018-07-06 |
| Matt Brown | 26-19-0 | 2023-05-13 |
| Matt Dwyer | 9-4-0 | 2016-01-30 |
| Matt Grice | 15-5-0 | 2013-02-23 |
| Matt Hamill | 12-8-0 | 2013-10-09 |
| Matt Hobar | 9-3-0 | 2014-12-06 |
| Matt Horwich | 30-25-1 | 2009-04-01 |
| Matt Hughes | 45-9-0 | 2011-09-24 |
| Matt Lindland | 22-9-0 | 2005-08-20 |
| 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 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 |
| Maurice Greene | 9-7-0 | 2021-05-08 |
| Maurice Smith | 12-14-0 | 2000-11-17 |
| Mauricio Rua | 27-14-1 | 2023-01-21 |
| 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 |
| Megan Anderson | 11-5-0 | 2021-03-06 |
| Mehdi Baghdad | 11-5-0 | 2016-07-07 |
| Melinda Fabian | 4-4-2 | 2018-06-23 |
| Melton Bowen | 0-1-0 | 1994-12-16 |
| Melvin Guillard | 32-18-2 (3 NC) | 2014-03-08 |
| Michael Bisping | 30-9-0 | 2017-11-25 |
| Michael Graves | 6-0-1 | 2016-07-30 |
| 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 Patt | 12-4-0 | 2009-03-07 |
| Michael Trizano | 11-3-0 | 2022-11-12 |