| Undefeated Saison | Funky Buddha Lounge and Brewery | Saison | 7.7% |
| Under Crown | 18th Street Brewery | | |
| Under My Plum | The Libertine Brewing Company | | 8.4% |
| Under My Plum | MadTree | American Barleywine | 11.9% |
| Under Pressure | 7venth Sun Brewery | Saison | |
| Under Pressure | Sneaky Snake Brewery | Wild Ale | |
| Under the Kilt | Dragonmead Microbrewery | Scotch Ale / Wee Heavy | 7.8% |
| Under the Sea | Folkingebrew | New England IPA | 7.0% |
| Under the Stars | Cerebral Brewing | American Imperial Stout | 12.5% |
| Under the stars | Spartacus Brewing | New England IPA | 10.0% |
| Underbar Jul | Electric Nurse | English Porter | 4.2% |
| Undercover Investigation Shut-Down Ale | Lagunitas Brewing Company | American Pale Ale | 9.3% |
| UnderCurrants | Firestone Walker Brewing Co. | Wild Ale | 6.3% |
| Undercurrent | Incendiary Brewing Company | Japanese Rice Lager | 4.5% |
| Underdark | Intuition Ale Works | American Imperial Stout | 9.5% |