| Obsessive Stout | Orange County Brewing @ Brown Barn Farms | American Imperial Stout | 10.5% |
| Obsidian | Cameron's Brewing | | 9.2% |
| Obsidian | Crossover Blendery | | 6.5% |
| Obsidian | Honey Pot Meadery | | 13.0% |
| Obsidian Rum Barrel | Camerons Brewery Company | | |
| Obsidian Stout | Deschutes Brewery | American Stout | 6.4% |
| Obsidian Throne | Half Acre Beer Company | | |
| Obsolete Absolute | Mikerphone | American Imperial Stout | 15.0% |
| Obstkomplott | BrewDog Ltd | American IPA | |
| Obtain Intellect | The Brewing Projekt | Berliner Weisse | 7.1% |
| OBX Beer | Weeping Radish Eco Farm & Brewery | Kölsch | 6.0% |
| OC/DC Mosaic Imperial Pils | Boiler Brewing Company | Imperial Pilsner | 6.7% |
| Occam's Razor | Short's Brewing Company | | 8.8% |
| Occults Antares | Jackie O's Pub & Brewery | American Imperial Stout | |
| Occupied Space | Highland Park Brewery | Wild Ale | 5.8% |