| Maslifter Oktoberfest | Hops Haven Brew Haus | Märzen | |
| Mason Series #7: 20th Anniversary | Red Brick Brewing Company | American Imperial Stout | 10.0% |
| Mass Extinction Ice Barley Wine | Phillips Brewing Company | American Barleywine | 12.0% |
| Mass Rising | Jack's Abby | Imperial Pilsner | 8.0% |
| Massacre! | Wolverine State Brewing | European Dark Lager | 10.5% |
| Massatucky Brown | Amherst Brewing Company | American Brown Ale | 5.3% |
| Massive | Great South Bay Brewery | American IPA | 7.0% |
| Massive Upheaval | Widmer Brothers Brewing | American IPA | 11.0% |
| Massive! | Gigantic Brewing Co. | American Barleywine | 12.0% |
| Master Blaster | J. Wakefield Brewing | American Porter | 10.0% |
| Master Brew Bitter | Shepherd Neame | | 4.0% |
| Master of Pumpkins | Troegs Brewing | Pumpkin Beer | 7.4% |
| Master of Unrelated Science | Odd13 Brewing | Saison | 6.4% |
| Master Splinter | Monday NIght Brewing | American Amber / Red Ale | 9.0% |
| Mastermind | Fiddlehead Brewing | Imperial IPA | 8.1% |