| Onus On Us | The Bruery | | |
| Onward Stout | Yazoo Brewing | American Stout | 3.8% |
| Onyx | Fireforge Crafted Beer | | |
| Onyx Amburana BA | Atrium | American Imperial Stout | 11.0% |
| Onze Trots Batch No1 Limited Edition | Gulpener Bierbrouwerij | New England IPA | 6.0% |
| Onze Trots Weizen Tripel | Gulpener Bierbrouwerij | Hefeweizen | 8.5% |
| Öö | Põhjala | Baltic Porter | 10.5% |
| Öö Cassis | Põhjala | Baltic Porter | 10.5% |
| Öö X | Põhjala | Baltic Porter | 13.0% |
| Oo Xo | Põhjala / Jester King Brewery | Baltic Porter | 11.5% |
| Öö XO (Cellar Series) | Põhjala | Baltic Porter | 11.5% |
| Ooey Gooey | Flying Monkeys Craft Brewery | Sweet / Milk Stout | 7.0% |
| Ooh La La | Horus Aged Ales | Wild Ale | 6.8% |
| Ook Best Lekker! | Brouwerij De Molen | Wild Ale | 6.5% |
| Oompa Loompa | Fat Head's Brewery & Saloon | American Stout | 6.5% |