| Otis & Bean | Monkish Brewing Co. | Saison | 6.6% |
| Otis Alt | Elk Grove Brewery & Restaurant | American Brown Ale | 5.3% |
| Otra Vez | Sierra Nevada Brewing Co. | Gose | 4.5% |
| Otsuchi Old Stock Ale 2012 | North Coast Brewing Co. | Old Ale | 11.7% |
| Ottakringer Helles | Ottakringer Brauerei AG | | 5.1% |
| Ottakringer Wiener Original | Ottakringer Brauerei AG | Vienna Lager | 5.3% |
| Ottavia | Luppolo | | 7.0% |
| Otter Creek Imperial India Pale Ale | Otter Creek Brewing & Wolaver's Organic Ales | Imperial IPA | 11.0% |
| Otter Creek Russian Imperial Stout | Otter Creek Brewing | Russian Imperial Stout | 10.0% |
| 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% |