| Oceanside's Thirteen | Horus Aged Ales | American Imperial Stout | 15.3% |
| Oceanside's Twelve | Horus Aged Ales | American Imperial Stout | 14.6% |
| Ochame | Godspeed Brewery | American IPA | 6.0% |
| The Ocho | Mikkeller San Diego | American Imperial Stout | 13.0% |
| Ocho De Mayo | Short's Brewing Company | Gose | 4.0% |
| 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 | |