| Marston's | United Kingdom |
| Martin House Brewing Company | Fort Worth, Texas |
| Martini-Brauerei | Kassel, Germany |
| Marz Community Brewing | Chicago |
| Marzoni's Brick Oven & Brewing Co | Duncansville, Pennsylvania |
| Mash House Restaurant and Brewery | Fayetteville, North Carolina |
| MashCraft Brewing | Greenwood, Indiana |
| Massengill's Brew Pub | San Pedro, California |
| Matilda Bay Brewing | North Fremantle, Australia |
| Matt's Home Brew | Cincinnati |
| Maui Brewing Co. | Lahaina, Maui, Hawaii |
| Maumee Bay Brewing | Toledo, Ohio |
| Mayflower Brewing Company | Plymouth |
| Mazama Brewing | |
| McCashin's Brewery & Malthouse | Nelson, New Zealand |