| Origo Patersbier | Buxton Brewery | Belgian Pale Ale | 4.0% |
| Orin | Half Acre Beer Company | American Brown Ale | 13.7% |
| Orion | Night Shift Brewing | | |
| Orlando Blonde Ale | Orlando Brewing | American Pale Ale | |
| Orleans Herbal | Eden | | 16.0% |
| Orleans Wood | Eden | | 16.0% |
| Orlio Common Ale | Orlio Organic | | 5.0% |
| Orlio Seasonal Black Lager | Orlio Organic | Schwarzbier | 4.5% |
| Orlio Seasonal India Pale Ale | Orlio Organic | American IPA | 5.4% |
| Orme | Bragdy'r Gogarth | English Bitter | |
| Ornament | North Brewing Co. | American IPA | |
| Ornamental | Phase Three Brewing Company | Saison | 6.8% |
| Ornery Amber Lager | Tommyknocker Brewery and Pub | American Lager | |
| Oro Agrio | Rivertown Brewing Company | Wild Ale | |
| Oro de Calabaza | Jolly Pumpkin Artisan Ales | Belgian Pale Strong Ale | 8.0% |