| Brewery | Location |
|---|---|
| Oshlag | |
| Oskar Blues / Cigar City | |
| Oskar Blues Brewery | |
| Oso | Plover, WI |
| Ostankinskij Pivovarennij Zavod | Moskva |
| Oswald | |
| Oswego Brewing Co. | Oswego, Illinois |
| Other Half & Cloudwater | |
| Other Half & Short Throw | Philadelphia, Pennsylvania |
| Other Half & Zagovor | |
| Other Half / 3 Chiefs | |
| Other Half / 3 Sons | |
| Other Half / Cellarmaker | |
| Other Half / Gigantic | |
| Other Half / Hidden Springs |