| Brewery | Location |
|---|---|
| Odonata Beer Company | Sacramento, California |
| Odyssey Beerwerks | Arvada, Colorado |
| Odyssey Craft Brewery | |
| OEC Brewing (Ordinem Ecentrici Coctores) | Oxfort, CT |
| Oedipus Brewing | Amsterdam, Netherlands |
| Oersoep | |
| Off Color Brewing | Chicago |
| Off Color/Amager Bryghus | |
| Off-Kilter Brewing | South Beloit, IL |
| Offshoot Beer Co. | Placentia |
| Offshore Ale | |
| Oggi's Pizza and Brewing - Vista | Vista, California |
| Ohio Brewing | Niles, Ohio |
| Ohza | |
| Okanagan Spring Brewery | Vernon, Canada |