| Own Worst Enemy | Mikerphone | Sweet / Milk Stout | 9.3% |
| Owyhee Canyonlands | Base Camp Brewing Company | Wild Ale | 5.6% |
| The Ox | Holy Mountain | | |
| The Ox & The Toad | Mad Fritz | Altbier | 5.5% |
| Oxaal 2022 | Pellicle Vergistingen | | |
| Oxaal: Kriek 2022 | Pellicle Vergistingen | | |
| Oxalis Pes Caprae Sour Blonde Ale | Cismontane Brewing | Wild Ale | 4.5% |
| Oxcart | Black Project Spontaneous & Wild Ales | Wild Ale | |
| Oxford | Claremont Craft Ales | Russian Imperial Stout | 13.0% |
| The Oximandias | De Garde Brewing | | |
| 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 | |