| Oatmeal Stout | Youngs & Company Brewery | American Stout | 5.2% |
| Oatmeal Yeti Imperial Stout | Great Divide Brewing Company | American Imperial Stout | 9.5% |
| Oatrageous | Prairie Artisan Ales | American Stout | 14.0% |
| Oats and Barley Stout | Delafield Brewhaus | American Stout | |
| Oats MacDonald | Great Lakes Brewing | American Pale Ale | 5.7% |
| Oaxaca | Omnipollo | American IPA | 6.5% |
| Oaxaca | Untitled Art | American Imperial Stout | 13.0% |
| Oaxacan | Wicked Weed | Wild Ale | 8.6% |
| Oaxacan Milk Stout | Warped Wing Brewing Company | American Stout | |
| Oaxen | Supermoon Beer Company | Belgian Pale Ale | 6.0% |
| OB Lager | Oriental Brewery | American Lager | 4.4% |
| OB Premium Pilsner | Oriental Brewery | German Pilsner | 5.2% |
| OB-1 Certified Organic Ale | Snake River Brewing | English Brown Ale | 4.9% |
| OB.LIV.I.OUS | Griffin Claw | Wheatwine | 13.0% |
| Obamagang Inauguration Ale | Brewery Ommegang | American Stout | |