| Brewery | Location |
|---|---|
| Oast House Brewers | Niagara-on-the-Lake, Canada |
| Ocean City Brewing Company | Ocean City |
| Oceanbryggeriet | Göteborg, Sweden |
| Oceanside Ale Works | Oceanside, California |
| Ocelot Brewing | Dulles, VA |
| Oconomowoc Brewing | Oconomowoc, Wisconsin |
| Odd Side Ales | Grand Haven, Michigan |
| Odd13 Brewing | |
| Oddside Ales | Grand Haven, Michigan |
| Oddwood Ales | Austin |
| Odell / Boulevard Brewing Companies | |
| Odell Brewing | Fort Collins, Colorado |
| Odin Brewing Co. | Seattle, WA |
| Odonata Beer Company | Sacramento, California |
| Odyssey Beerwerks | Arvada, Colorado |