| Fighter | Record | Last Bout |
|---|---|---|
| Marcel Fortuna | 9-3-0 | 2017-11-11 |
| Marcelo Aguiar | 2-3-1 | 2000-06-09 |
| Marcelo Golm | 6-3-0 | 2019-04-20 |
| Marcelo Guimaraes | 9-2-1 | 2016-03-05 |
| Marcelo Mello | 1-0-0 | 1999-05-07 |
| Marcelo Rojo | 16-10-0 | 2022-12-03 |
| Marcin Bandel | 15-7-0 | 2015-04-11 |
| Marcin Held | 23-7-0 | 2017-10-21 |
| Marcin Wrzosek | 12-4-0 | 2015-12-11 |
| Marcio Alexandre Junior | 17-4-0 | 2015-12-12 |
| Marcio Cruz | 8-3-0 | 2006-12-30 |
| Marco Beltran | 8-6-0 | 2017-10-07 |
| Marco Polo Reyes | 8-7-0 | 2019-09-21 |
| Marco Ruas | 9-4-2 | 1999-07-16 |
| Marcos Mariano | 6-6-0 | 2019-09-21 |
| Marcos Rogerio de Lima | 22-10-1 | 2024-02-17 |
| Marcos Vinicius | 23-11-1 | 2013-09-04 |
| Marcus Aurelio | 22-10-0 | 2009-08-29 |
| Marcus Bossett | 1-3-0 | 1996-12-07 |
| Marcus Brimage | 7-7-0 | 2015-07-18 |
| Marcus Davis | 22-11-0 (1 NC) | 2011-01-01 |
| Marcus Jones | 4-2-0 | 2009-12-05 |
| Marcus LeVesseur | 22-7-0 | 2012-12-08 |
| Marcus Silveira | 6-4-0 (1 NC) | 1997-12-21 |
| Maria Oliveira | 13-7-0 | 2023-06-10 |
| Mario Miranda | 14-7-0 | 2011-03-26 |
| Mario Neto | 13-5-0 | 2006-09-23 |
| Marion Reneau | 9-8-1 | 2021-07-17 |
| Mariya Agapova | 10-5-0 | 2024-07-13 |
| Mark Bocek | 12-5-0 | 2014-04-16 |
| Mark Coleman | 16-10-0 | 2010-02-06 |
| Mark De La Rosa | 11-5-0 | 2020-06-13 |
| Mark Eddiva | 6-3-0 | 2016-03-19 |
| Mark Godbeer | 13-4-0 | 2018-03-17 |
| Mark Hall | 5-6-0 | 1996-12-07 |
| Mark Holst | 12-6-0 | 2010-10-16 |
| Mark Hominick | 20-12-0 | 2012-11-17 |
| Mark Hughes | 6-2-0 | 2000-11-17 |
| Mark Hunt | 13-14-1 (1 NC) | 2018-12-01 |
| Mark Kerr | 15-11-0 (1 NC) | 1997-10-17 |
| Mark Madsen | 12-2-0 | 2023-11-11 |
| Mark Munoz | 14-6-0 | 2015-05-16 |
| Mark Robinson | 1-0-0 (1 NC) | 2001-02-23 |
| Mark Scanlon | 9-2-0 | 2010-11-13 |
| Mark Schultz | 1-1-0 | 1996-05-17 |
| Mark Striegl | 18-4-0 (1 NC) | 2022-02-19 |
| Mark Weir | 21-18-1 | 2003-04-25 |
| Markus Perez | 12-5-0 | 2021-01-20 |
| Marlon Moraes | 23-10-1 | 2022-03-12 |
| Marnic Mann | 6-3-0 | 2024-04-27 |