| Underdark | Intuition Ale Works | American Imperial Stout | 9.5% |
| UnderDog Atlantic Lager | Flying Dog Brewery | American Lager | 4.7% |
| Underground | Fonta Flora | Kvass | 2.8% |
| Underground Breakfast | Amalgam | American Imperial Stout | 13.0% |
| Underground IPA | Stout Brothers Public House | American IPA | |
| Underground Methods | Cerebral Brewing | American Imperial Stout | 15.2% |
| Underground Mountain Brown | Founders Brewing | American Brown Ale | 11.9% |
| Underlig Jul | Nøgne Ø | Herb and Spice Beer | 6.5% |
| underlig jul | Nøgne Ø - Det Kompromissløse Bryggeri A/S | Herb and Spice Beer | 6.5% |
| Underphil | Beer Here | | 6.8% |
| Understory | Swamp Head Brewery | New England IPA | 6.7% |
| Undertaker | Brewery Vivant | Belgian Dark Strong Ale | 5.0% |
| Undertone | Casey Brewing And Blending | | 7.0% |
| Undertone - Aged in Cherry Liqueur barrels | Casey Brewing And Blending | | |
| Undertone - Apricot + Vanilla | Casey Brewing And Blending | | 7.0% |