| Oudenaarde Imperial Sour Ale | Brouwerij Smisje | Dubbel | 12.0% |
| Oudilis Blend 3 | OEC Brewing (Ordinem Ecentrici Coctores) | | |
| Oudilis Cerasus | OEC Brewing (Ordinem Ecentrici Coctores) | | |
| Oudilis Cerasus Blend 2 | OEC Brewing (Ordinem Ecentrici Coctores) | | |
| Oudilis Fragaria blend 1 | OEC Brewing (Ordinem Ecentrici Coctores) | | |
| Oudilis Peche | OEC Brewing (Ordinem Ecentrici Coctores) | Fruit Lambic | 6.2% |
| Oudste | Tommie Sjef Wild Ales | | |
| Oui, Chef | Breakside Brewery | Saison | 5.0% |
| Ouillage | Jackie O's Pub & Brewery | | 7.4% |
| Ouisconsing Red Ale | Central Waters Brewing Company | American Amber / Red Ale | 4.8% |
| Oumuamua | Driftwood Brewery | Sweet / Milk Stout | 6.3% |
| Our 200th Brew | The Ale Apothecary | Wild Ale | 8.7% |
| Our Beautiful Dark Twisted Fantasy | Mikerphone | American Imperial Stout | 14.8% |
| Our Brownies are Made with Love | Listermann Brewing Company | American Imperial Stout | 12.0% |
| Our Buns Have No Seeds | Garagiste Meadery | | |