| Beer | Brewery | Style | ABV |
|---|---|---|---|
| Obscurite | Ithaca Beer Company | Belgian Dark Strong Ale | 10.0% |
| Obscuro & Nimbosus | Avery Brewing Company | Wild Ale | 8.1% |
| The Observer | TrimTab Brewery | New England IPA | 8.0% |
| Observing Reason | Trillium | American Imperial Stout | 13.9% |
| Observing Reason | Trillium / Bottle Logic | American Imperial Stout | 13.9% |
| Observing Reason (Barrel Aged) | Trillium / Bottle Logic | American Imperial Stout | 15.7% |
| 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 |