| Octaves | Upright Brewing Company | | 6.0% |
| Octo Rock | Short's Brewing Company | | 4.9% |
| Octoberfest | Abita Brewing Company | Märzen | 5.4% |
| Octoberfest | Samuel Adams | Märzen | 5.3% |
| Octoberfest | Trap Rock Restaurant and Brewery | Märzen | |
| Octoberfest (discontinued) | Gottberg Brew Pub | Märzen | |
| Octoberfest Beer | Bell's Brewery, Inc. | Märzen | 5.5% |
| Octoberfest Lager | Central Waters Brewing Company | Märzen | 5.5% |
| Octoberfest Maerzen | Old Dominion Brewing Co. | Märzen | 5.9% |
| Octobre En Avril | Avant-Garde Artisans Brasseurs | | 9.5% |
| Octopus Ink Black IPA | The Pike Brewing Co. | Black IPA | 8.2% |
| Ocular Pat-Down | Odd Side Ales | Robust Porter | 6.0% |
| Ocularity | Bottle Logic | Imperial IPA | 9.5% |
| Oculus | Crooked Stave Artisan Beer Project | Wild Ale | 9.0% |
| ODB ( Ol' Dirty Barrel) | Belching Brewing | Russian Imperial Stout | 10.5% |