| Orchard Street Brewery | Bellingham, Washington |
| Ore Dock Brewing Company | Marquette, Michigan |
| Örebro Brygghus | Örebro, Sweden |
| Örebro Brygghus & All In Brewing | Örebro |
| örebro Bryygghus & All In Brewing | |
| Oregon Trader Brewing | Albany, Oregon |
| Oregon Trail Brewery | Corvallis, Oregon |
| Oriental Brewery | Korea, Republic of |
| Origin Beer Project | Providence, Rhode Island |
| Original Basil T's | Red Bank, New Jersey |
| Orkney Brewery | Orkney, United Kingdom |
| Orlando Brewing | Orlando, Florida |
| Orlio Organic | South Burlington, Vermont |
| Orpheus Brewing | Atlanta, Georgia |
| Os Três Cervejeiros | Porto |