| Marshall Wharf Brewing Company | Belfast, Maine |
| Marston's | United Kingdom |
| Martin City Brewing Company | Kansas City, Missouri |
| Martin House Brewing Company | Fort Worth, Texas |
| Martin's | Belgium |
| Martini-Brauerei | Kassel, Germany |
| Maryensztadt | |
| Marz Community Brewing | Chicago |
| Marzoni's Brick Oven & Brewing Co | Duncansville, Pennsylvania |
| Mash House Restaurant and Brewery | Fayetteville, North Carolina |
| MashCraft Brewing | Greenwood, Indiana |
| Maskeron | Zagreb, Croatia |
| Mason Ale Works | |
| Mass. Bay Brewing Company | Boston, Mass |
| Massengill's Brew Pub | San Pedro, California |