| Brewery | Status | Owner |
|---|---|---|
| Old German | Corporate | Iron City Brewing Company |
| Olde English | Corporate | Molson Coors |
| Olde Saratoga Brewing Company | Crafty | United Breweries Group (India) |
| Olympia | Corporate | Pabst Brewing Company (Blue Ribbon Intermediate Holdings) |
| Omission | Crafty | AB InBev |
| Ommegang | Craft | Duvel Moortgat (Belgium) |
| Oskar Blues | Craft | CANarchy Craft Brewery Collective |
| Other Half Brewing Co | Craft | Sam Richardson, Matt Monahan and Andrew Burman |
| Otter Creek | Craft | Long Trail Brewing Company |
| Oval Craft Brewing | Craft |
Craft or Crafty?
Who owns your beer?
