| Ochre Frumento | Green Flash Brewing Co. | American Barleywine | 17.5% |
| OCP (Oatmeal Creme Pie) | Pigeon Hill Brewing Company | American Brown Ale | 6.0% |
| Octane Overlord | Brouwerij De Moersleutel | Russian Imperial Stout | 12.0% |
| Octave | Omnipollo | Belgian Pale Ale | 6.4% |
| 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% |