| Insane in the Membrane | Brouwerij Frontaal | English IPA | 5.5% |
| Insane In the Yeast Strain | Seven Stills Brewery and Distillery | New England IPA | 8.5% |
| Insanely Bad Elf | Ridgeway Brewing | English Strong Ale | 11.2% |
| Insanity | Weyerbacher Brewing Company | American Barleywine | 11.1% |
| Insensitive | Definitive Brewing Company | New England IPA | 7.0% |
| Insert Hop Reference Here | Brew Link Brewing Co | American Pale Ale | 5.8% |
| Insetto | Stillwater Artisanal Ales | | 5.0% |
| Inside a Broken Clock | Bizarre Brewing | European Pale Lager | 4.2% |
| Inside of Outside | Supermoon Beer Company | Saison | 6.0% |
| Inside Voice | Sante Adairius Rustic Ales | English Barleywine | 16.0% |
| Insidious Imperial Stout | Fegley's Brew Works | American Imperial Stout | 9.0% |
| Insight: Aronia | Wunderkammer Bier | Wild Ale | |
| Insight: Fir | Wunderkammer Bier | Wild Ale | |
| Insight: Gooseberry | Wunderkammer Bier | Saison | |
| Insight: Lilac | Wunderkammer Bier | Wild Ale | 4.8% |