| OST Porter | Rogness Brewing Company | English Porter | 5.7% |
| Ostara | TRVE Brewing Co. | Wild Ale | 4.7% |
| Ostindien | Mariestads | | |
| Ostronporter | Grebbestad bryggeri | | 5.8% |
| Otagoffa | J. Wakefield Brewing | American Imperial Stout | |
| Othello | Barrel House Brewing Co. | | 8.7% |
| Othello | Barrelhouse Brewing Co. | | 8.7% |
| Other Hans | Brewski | American IPA | 6.9% |
| The Other Matt IPA | Double Mountain Brewery & Taproom | American IPA | 6.2% |
| Other Side | Tideland Brewing | | |
| Otherness One | Horus Aged Ales | Braggot | 15.6% |
| Otiose | The Bruery | Wild Ale | |
| Otis | Williams Brothers Brewing Company | American IPA | |
| Otis & Bean | Monkish Brewing Co. | Saison | 6.6% |
| Otis Alt | Elk Grove Brewery & Restaurant | American Brown Ale | 5.3% |