| Matterhorn | Night Shift Brewing | Saison | 7.2% |
| Matties Jungle | Brouwerij Eleven | Herb and Spice Beer | 4.9% |
| Mattina Rossa | Allagash Brewing Company | Wild Ale | 6.6% |
| Mattrazzo | Plan Bee Farm Brewery | Saison | |
| Matt’s Sleepy Time Belgian Imperial Stout | Beau's All Natural Brewing Co. | American Imperial Stout | 8.0% |
| Maturin | Magnanimous | Russian Imperial Stout | 13.5% |
| Matuška Apollo Galaxy | Minipivovar Matuška Broumy (Matuska) | | 5.5% |
| Matuška IPA Raptor Super Dry | Minipivovar Matuška Broumy (Matuska) | American IPA | 6.2% |
| Maud | Fair Isle Brewing | Saison | 4.5% |
| Maudite | Unibroue | Belgian Dark Strong Ale | 8.0% |
| Maui Coconut Porter | Maui Brewing Co. | American Porter | 5.7% |
| Maui Waui | Altamont Beer Works | American IPA | 6.5% |
| Maui's limited-release Wee Heavy Strong Ale | Maui Brewing Co. | Scotch Ale / Wee Heavy | 11.0% |
| Maul Maple & Coffee | HighGrain | American Imperial Stout | 11.5% |
| Maumasi | Anchorage Brewing Co | American Imperial Stout | 16.0% |