Fighters
| first | last | nickname |
|---|---|---|
| Jason | MacDonald | "The Athlete" |
| Lyoto | Machida | |
| Demian | Maia | |
| Rory | Markham | |
| Nate | Marquardt | "The Great" |
| Terry | Martin | |
| Gray | Maynard | "The Bully" |
| Charles | McCarthy | "Chainsaw" |
| Tamdan | McCrory | "The Barn Cat" |
| Drew | McFedries | |
| Antonio | Mendes | "Samuray" |
| Cole | Miller | "Magrino" |
| Frank | Mir | |
| Roman | Mitichyan | |
| Brad | Morris | |
| Jon | Murphy | "The Sherpa" |