| Irregardless IPA | Liquid Hero Brewery | American IPA | 6.5% |
| Irvington Porter | Alameda Brewhouse | American Porter | |
| Is Radical Café | HopEra Microbrasserie & Pizzeria | American Imperial Stout | 10.0% |
| Is Radical Cognac | HopEra Microbrasserie & Pizzeria | Russian Imperial Stout | 11.0% |
| Is This The Real Life? | SingleCut Beersmiths | American IPA | 7.2% |
| Isaac | Birrificia Le Baladin | Witbier | 5.0% |
| Isabel Barrel Aged Robust Porter | Blue Mountain Brewery | | |
| Isabella Blonde | Kern River Brewing Company | American Blonde Ale | 4.5% |
| Isabelle Proximus | The Lost Abbey | Wild Ale | 7.0% |
| Isabelle Proximus | Port Brewing Company | | |
| Iscider (2014) | Håkan | Fruit and Field Beer | 9.0% |
| Ise Kadoya Stout | Nikenjayamochi Kadoya Honten Co. | American Stout | 5.0% |
| Isi dor | Bierbrouwerij De Koningshoeven | | |
| Isis | Sonoma Springs Brewery | Wild Ale | 5.6% |
| Isla | The Good Beer Company | Wild Ale | 4.8% |