| I.P.A. | Marin Brewing | American Pale Ale | |
| I.P.A.P.A. | Lowlander | English IPA | 3.5% |
| I: Not Yanny | Horus Aged Ales | Wild Ale | 8.2% |
| IACEd in Space | Other Half Brewing Co. | Imperial IPA | 8.8% |
| Iambic Lambic | Grizzly Peak Brewing | Fruit Lambic | |
| IBA | Lakefront Brewery | | 6.5% |
| Iberian Nightcap | Melovino Craft Meadery | | 13.0% |
| Ibex Series: Barrel Aged Pumpkin Ale | Schlafly | Pumpkin Beer | |
| Ibex Series: Barrel-Aged Imperial Stout | Schlafly | American Imperial Stout | 10.2% |
| Ibex Series: Bourbon Barrel-Aged Barleywine | Schlafly | English Barleywine | |
| Ibex Series: Imperial Coffee Stout | Schlafly | American Imperial Stout | 10.2% |
| Ibex Series: Local Oak | Schlafly | Wild Ale | |
| Ibrik | O'Connor Brewing Company | American Imperial Stout | 7.5% |
| IC Light | Iron City Brewing Co. | Light Lager | 4.2% |
| Icarus | Mortalis | | |