| Brewery | Location |
|---|---|
| Mass. Bay Brewing Company | Boston, Mass |
| Massengill's Brew Pub | San Pedro, California |
| Mast Landing Brewing Company | Westbrook , ME |
| Master Gao Brewing Company | Nanjing, China |
| Masthead Brewing Company | |
| Mastri Birrai Umbri | |
| Matchless | Olympia, WA |
| Matera Brasseurs Tonneliers | |
| Matilda Bay Brewing | North Fremantle, Australia |
| Matt's Home Brew | Cincinnati |
| Matten | Matzenheim, France |
| Maui Brewing Co. | Lahaina, Maui, Hawaii |
| Maumee Bay Brewing | Toledo, Ohio |
| Maximus Brouwerij | Belgium |
| Maybee Brewing Company | Fredericton |