| Orphic Fragments | Modern Times | | 8.1% |
| Orter I Morker | Jester King Craft Brewery | Saison | 7.9% |
| Ortolan Bunting - Mezcal (Ghost 232) | Adroit Theory | American Strong Ale | 9.1% |
| Orval Trappist Ale | Brasserie d'Orval | Belgian Pale Ale | 6.9% |
| Orviamo | Side Project | Wild Ale | 10.0% |
| Osage Golden Wheat Ale | TwoRows Restaurant & Brewery - Dallas | American Lager | |
| OSB Premium Ale | Tomos Watkin and Sons Ltd. | | 4.5% |
| Oscar Aged In Blackberry Whiskey Barrels | New Belgium Brewing | Wild Ale | 8.8% |
| Oscar Aged in Blackberry Whiskey Barrels | 2017 | New Belgium Brewing | Wild Ale | 8.8% |
| Oscar Blond | Brouwerij Eutropius | Belgian Blonde Ale | 6.6% |
| Oscar Bruin | Brouwerij Eutropius | | 6.5% |
| Oscar's Chocolate Oatmeal Stout | Sand Creek Brewing Company | Oatmeal Stout | 5.6% |
| Oscar's Double Chocolate Milk Stout | Sand Creek Brewing Company | American Imperial Stout | 10.0% |
| Oscars | Sand Creek Brewing Company | Oatmeal Stout | 4.5% |
| Oscillate Wildly | Strangeways Brewing | Wild Ale | 10.0% |