| Isabella Blonde | Kern River Brewing Company | American Blonde Ale | 4.5% |
| Isabelle Proximus | The Lost Abbey | Wild Ale | 7.0% |
| Isaria | Triptych Brewing | European Pale Lager | 4.9% |
| Iscider (2014) | Håkan | Fruit and Field Beer | 9.0% |
| Ise Kadoya Stout | Nikenjayamochi Kadoya Honten Co. | American Stout | 5.0% |
| Ish | Oxbow Brewing Company | | |
| Ishmael | Rising Tide | American Brown Ale | |
| Isi dor | Bierbrouwerij De Koningshoeven | | |
| Isis | Sonoma Springs Brewery | Wild Ale | 5.6% |
| Isla | The Good Beer Company | Wild Ale | 4.8% |
| Isla de la Playa | Heavy Reel Brewing Company | American Lager | 5.0% |
| Island Beach Lager | Heavy Reel Brewing Company | American Lager | 5.0% |
| Island Booty | Tyranena Brewing | | |
| Island Chomper | Short's Brewing Company | Imperial IPA | 9.8% |
| Island Daydream | The Rare Barrel | Wild Ale | 6.3% |