| Ovila Quad Brandy Barrel-Aged | Sierra Nevada Brewing Co. | Quadrupel (Quad) | 10.1% |
| OVL Stout | Russian River Brewing Company | | 4.0% |
| OWD Mac's - Templeton Barrel Aged | Free State Brewing | Russian Imperial Stout | 12.1% |
| Own Worst Enemy | Mikerphone | Sweet / Milk Stout | 9.3% |
| The Ox | Holy Mountain | | |
| Oxalis Pes Caprae Sour Blonde Ale | Cismontane Brewing | Wild Ale | 4.5% |
| Oxymoronic | Left Hand Brewing Company | | |
| Oyster Point Oyster Stout | 21st Amendment Brewery Cafe | American Stout | 5.9% |
| Oyster Stout | Fordham Brewing | American Stout | |
| Oyster Stout | Marston's | English Stout | 4.5% |
| Oyster Stout | Oyster Bar Bistro and Brewery | American Stout | |
| Oyster Stout | Porterhouse Brewing Company | | |
| Oyster Stout | Upright Brewing Company | English Stout | 6.3% |
| Oyster Stout - Taylor Shellfish Farms | No-Li Brewhouse | American Stout | 6.1% |
| Ozeno Yukidoke IPA | Ryujin Shuzo Co,. Ltd. | American IPA | 5.5% |