| Otto | Hair of the Dog Brewing Company | | |
| Otto Ale | Victory Brewing | Smoked Beer | 8.1% |
| Otto From The Wood | Hair of the Dog Brewing Company | American Strong Ale | 13.0% |
| Otto In Oak | Victory Brewing | Smoked Beer | |
| Otto's Hefeweizen | Otto's Pub and Brewery | Hefeweizen | 7.1% |
| Otto's Jacket | Cellarmaker Brewing Co. | American IPA | 6.8% |
| Otto's Weizenbock | Otto's Pub and Brewery | Weizenbock | 7.2% |
| Ottobre | Birrificio Del Ducato | Wild Ale | 7.0% |
| Ouais | Une Année | Wild Ale | 5.5% |
| OuaWARon | Brasserie du Bas-Canada | American Imperial Stout | 11.0% |
| Oubliant | Forest & Main | Tripel | 10.0% |
| Oubliette | Seventh Son Brewing Co | Russian Imperial Stout | 12.0% |
| Oud 15 | Bullfrog Brewery | Flanders Red Ale | 13.0% |
| Oud Beersel Bersalis Tripel | Brouwerij Oud Beersel | Tripel | 9.5% |
| Oud Beersel Bersalis Tripel Oak Aged | Brouwerij Oud Beersel | Tripel | 10.5% |