| Otter Creek Russian Imperial Stout | Otter Creek Brewing & Wolaver's Organic Ales | American Imperial Stout | 10.6% |
| The Otter in the Rye | Elder Pine Brewing & Blending | American Imperial Stout | 13.0% |
| Otter Melon | Central State | | |
| Otto | Fair Isle Brewing | Saison | 7.3% |
| Otto | Hair of the Dog Brewing Company | | |
| Otto | Perennial Artisan Ales | American Imperial Stout | 13.8% |
| 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% |