| O.T.I.S. (Oh This Is Sour) | Strangeways Brewing | Wild Ale | 5.0% |
| O.T.I.S. Gin barrel aged | Strangeways Brewing | Wild Ale | 5.0% |
| O.T.I.S. Tequila Barrel Aged | Strangeways Brewing | | 5.0% |
| O.W.K. | Side Project | American Imperial Stout | 15.0% |
| O/O & STIGBERGETS IMPERIAL IPA | Stigbergets Bryggeri | Imperial IPA | 8.0% |
| O/Sour 2022 | Åben | Gose | 4.5% |
| Oachkatzlschwoaf | Urban Chestnut Brewing Company | Märzen | 5.4% |
| Oak & Dagger | Vocation Brewery | American Stout | 7.5% |
| Oak & Mirrors | Brehon Brewhouse | | 7.5% |
| Oak & Orchard Dark Sour with Plums Aged in Whiskey Barrels | Epic Brewing Company | Wild Ale | 7.7% |
| Oak + Age; Vanilla From Tacoma To Vladivostok With Love | Sig Brewing | Russian Imperial Stout | 12.5% |
| Oak + Instinct | Wolves & People Farmhouse Brewery | Wild Ale | 6.4% |
| Oak Aged 1847 Rye Stout | Lavery Brewing Company | Irish Dry Stout | 6.8% |
| Oak aged 400 rom edition | Det Lille Bryggeri | American Imperial Stout | 10.2% |
| Oak Aged Anniversary IV Rye Pale Ale | Denver Beer Company | American Pale Ale | 6.0% |