| Maciag Offroad |  | | Leipzig | 11 |
| MacQueen's Bike Shop | | PE | Charlottetown | 24 |
| Mad Elk Cycles | | | | 24 |
| Manteo Cyclery | | NC | Manteo | 1 |
| Maros Bike | | | Cluj-Napoca | 1 |
| Martin's Bicycle Shop | | ON | Southampton | 16 |
| Marty's Mountian Cycle | | BC | Victoria | 93 |
| Mason Racing Cycles | | NH | Lebanon | 15 |
| Mathieu Performance | | QC | Québec City | 63 |
| Matthew Larsen Wheelbuilding | | WA | Spokane | 1 |
| Maul's Bike Shop | | MA | Halifax | 7 |
| Mellow Velo | | NM | Santa Fe | 7 |
| Messier Bicyclettes | | QC | Saint-Jean-sur-Richelieu | 11 |
| Metal Motion Bikes | | | Witten | 3 |
| Middle of Town Cycling | | KY | Louisville | 1 |
| Mike's Bikes | | NV | Tonopah | 1 |
| Mikes Hike And Bike | | KY | Richmond | 6 |
| Milford Bicycle | | MA | Milford | 24 |
| Missoula Bicycle Works | | MT | Missoula | 15 |
| Moment Bicycles | | CA | San Diego | 2 |
| Moment Bicycles - Carmel Valley | | CA | San Diego | 1 |
| Monster Bike | | | Inverness | 22 |
| Moontime Cyclery - Edwards | | CO | Edwards | 7 |
| More Bikes | | BC | Vancouver | 6 |
| Mountain Trax | | | Wokingham | 20 |
| MTB Connection | | NB | Lakeville | 2 |
| Mud Sweat & Gears | | AB | Red Deer | 10 |
| Mud, Sweat, and Gears | | AB | Spruce Grove | 13 |
| Muddy Bikes | | MN | | 3 |