| 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 | |
| Obamanator Maibock | Wynkoop Brewing | Maibock | |
| Obedience | Seedy Brewing | Saison | 8.8% |
| Obergärig / Münster Alt | Brauerei und Altbierkche Pinkus Mller | American Brown Ale | |
| Oberon | Bell's Brewery, Inc. | American Pale Wheat Beer | 5.8% |
| Obligatory Manifestation of Malt | Cigar City Brewing | American Barleywine | 11.0% |
| Obliteration I | Midnight Sun Brewing Co. | Imperial IPA | 8.5% |
| Obliteration II | Midnight Sun Brewing Co. | Imperial IPA | 8.3% |
| Obliteration III | Midnight Sun Brewing Co. | Imperial IPA | 7.6% |
| Obliteration IV | Midnight Sun Brewing Co. | Imperial IPA | 8.7% |
| Obliteration V | Midnight Sun Brewing Co. | Imperial IPA | 8.2% |