M
- Sherjill MacDonald, Chicago Fire
- Zac MacMath, Philadelphia Union
- Mike Magee, Los Angeles Galaxy
- Calum Mallace, Montreal Impact
- Kenny Mansally, Real Salt Lake
- Justin Mapp, Montreal Impact
- James Marcelin, FC Dallas
- Neven Marković, Sporting Kansas City
- Rafael Márquez, New York Red Bulls
- Erich Marscheider, Houston Dynamo
- Chad Marshall, Columbus Crew
- Tyrone Marshall, Colorado Rapids
- Enzo Martinez, Real Salt Lake
- Josué Martínez, Philadelphia Union
- Mario Martínez, Seattle Sounders FC †
- Felipe Martins, Montreal Impact
- Pablo Mastroeni, Colorado Rapids
- Darren Mattocks, Vancouver Whitecaps FC
- Aaron Maund, Toronto FC
- Jack McBean, Los Angeles Galaxy
- Stephen McCarthy, New England Revolution
- Dax McCarty, D.C. United
- Brandon McDonald, D.C. United
- Jack McInerney, Philadelphia Union
- Rauwshan McKenzie, Chivas USA
- Patrick McLain, Chivas USA
- Jimmy McLaughlin, Philadelphia Union
- Ryan Meara, New York Red Bulls
- Tim Melia, Chivas USA
- Carlos Mendes, Columbus Crew
- Justin Meram, Columbus Crew
- Bryan Meredith, Seattle Sounders FC
- Tommy Meyer, Los Angeles Galaxy
- Kenny Miller, Vancouver Whitecaps FC
- Kyle Miller, Sporting Kansas City
- Roy Miller, New York Red Bulls
- Oswaldo Minda, Chivas USA
- Sebastián Miranda, Columbus Crew
- Milovan Mirošević, Columbus Crew
- Carlyle Mitchell, Vancouver Whitecaps FC
- Adam Moffat, Houston Dynamo
- Miguel Montaño, Montreal Impact
- Fredy Montero, Seattle Sounders FC
- Drew Moor, Colorado Rapids
- Javier Morales, Real Salt Lake
- Alejandro Moreno, Chivas USA
- Ashtone Morgan, Toronto FC
- Justin Morrow, San Jose Earthquakes
- Hanyer Mosquera, Portland Timbers
- Brian Mullan, Colorado Rapids
- Nico Muniz, Real Salt Lake
- Tim Murray, New England Revolution
- Danny Mwanga, Portland Timbers
- Chance Myers, Sporting Kansas City
Read more about this topic: List Of Current Major League Soccer Players