| Master Splinter | Monday Night Brewing | American Amber / Red Ale | 9.0% |
| Mastermind | Fiddlehead Brewing | Imperial IPA | 8.1% |
| Mastermind | Sideswipe Brewing | American Imperial Stout | 11.0% |
| Masterpiece - Cognac | FiftyFifty Brewing Co. | American Imperial Stout | 12.5% |
| Masterpiece Porter | Stone Cellar Brewpub & Restaurant | American Porter | |
| Masters Blend | Weathered Souls Brewing Co. | American Imperial Stout | 16.0% |
| Mastodon | Rhinegeist Brewery | Belgian Dark Strong Ale | 9.8% |
| Mastodon Mother Puncher | Mikkeller | American IPA | 6.6% |
| Matador | Brasserie du Bas-Canada | American Imperial Stout | 11.9% |
| The Matador | Flying Monkeys Craft Brewery | Imperial IPA | 10.0% |
| Matador 2.0 El Toro Bravo | Flying Monkeys Brewing Co. | | |
| Mātakitaki Valley | Garage Project | New England IPA | 8.0% |
| Matame Ahorita | Anchorage Brewing Co | Wild Ale | 6.5% |
| Matame Ahorita | Jolly Pumpkin Artisan Ales | Gose | 5.5% |
| Matane Pilsen | Brasserie artisanale la Fabrique | German Pilsner | 4.5% |