| Old Redwood Brewing Co. | Windsor, California |
| Old Schoolhouse Brewery | Winthrop, WA |
| Old Tappan Brew Co. | Bayville, New York |
| Old Thunder Brewing Company | Pittsburgh, Pennsylvania |
| Old Town Brewing Co | Portland, Oregon |
| Old Yale Brewing Co. | |
| Olde Burnside Brewing | |
| Olde Hickory Brewery | Hickory, NC |
| Olde Main Brewing | Ames, Iowa |
| The Olde Mecklenburg Brewery | Charlotte, North Carolina |
| Olde Peninsula Brewpub and Restaurant | Kalamazoo, Michigan |
| Oldenberg Brewery | Fort Mitchell, Kentucky |
| Oliphant | Somerset |
| Oliver Ales | |
| Olivers Cider & Perry | United Kingdom |