| Brewery | Location |
|---|---|
| Oceanbryggeriet | Göteborg, Sweden |
| Oceanside Ale Works | Oceanside, California |
| Ocelot Brewing | Dulles, VA |
| Oconomowoc Brewing | Oconomowoc, Wisconsin |
| Octabrew | |
| Octant - Microbrasserie Inc. | Rimouski, Canada |
| Octopi Brewing | Waunakee, WI |
| Odd Breed Wild Ales | Pompano Beach |
| Odd Brothers Craft Cider | |
| Odd Island Brewing | Kungsbacka |
| ODD Muse Brewing Company | Farmers Branch, Texas |
| Odd Side Ales | Grand Haven, Michigan |
| Odd Side Ales | Grand Haven, Michigan |
| Odd13 Brewing | |
| Oddity brewing | Spain |