| Mendocino Brewing - Hopland | Hopland, California |
| Mendocino Brewing - Saratoga Springs | Saratoga Springs, New York |
| Mendocino Brewing - Ukiah | Ukiah, California |
| Mercury Brewing Company | Ipswich, Massachusetts |
| Meridian Hive | Austin |
| Merrimack Ales | Lowell |
| Messorem Bracitorium | Montreal, Canada |
| Měšťanský pivovar Havlíčkův Brod a.s. | Havlickuv Brod, Czech Republic |
| metabrewing | costa mesa, california |
| Metal Monkey Brewing | Romeoville |
| Metalhead Brewery | Burgas, Bulgaria |
| Métaphore | |
| Méthode Goat | Belgium |
| Métier Brewing Company | Woodinville |
| Metropolitan Brewing | Chicago, Illinois |