| Oskar KMS Bismarck | Noctem Artisans Brasseurs | American IPA | 7.0% |
| Oskar KMS Cossack | Noctem Artisans Brasseurs | New England IPA | 7.0% |
| Osmosis | Sapwood Cellars | Czech Amber Lager | 5.8% |
| Osmotar | Plan Bee Farm Brewery | Wild Ale | |
| Oso | Cismontane Brewing | English Porter | 10.0% |
| Oso Bueno | 11 Below Brewing | American Amber / Red Lager | 5.3% |
| Oso Furioso | Sudwerk Brewing | Doppelbock | 9.0% |
| Osprey's Fresh Catch | Horus Aged Ales | American IPA | 7.0% |
| Ossian | Inveralmond Brewery | English Pale Mild Ale | 4.1% |
| Ossipioja | Sap House Meadery | | |
| 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 | |