| Onolicious | Odell Brewing | Wild Ale | 6.5% |
| Onoskelis Barleywine | Palo Alto Brewing Company | English Barleywine | 11.0% |
| Ons Blackie | Van Moll | Russian Imperial Stout | 9.0% |
| Onshore Lager | Flying Fish Brewing Company | American Lager | 4.9% |
| 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 Limited Edition No. 1 - Ijsbock Dubbel | Gulpener Bierbrouwerij | Eisbock | 8.0% |
| 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% |