| Olde St.Nick | Brewmasters Restaurant and Brewery South | | 9.9% |
| Olde Suffolk | Greene King | Old Ale | |
| Olde Towne Pumpkin Ale | Straight to Ale Brewing | Pumpkin Beer | |
| Olde Village Stock Ale | Kuhnhenn Brewing | Old Ale | 14.2% |
| Olde Voyager Port | NoDa Brewing Company | English Barleywine | 10.0% |
| Older Gods | Wayfinder Brewery | Maibock | 6.7% |
| Older No Wiser | FrauGruber Brewing | Weizenbock | 8.2% |
| Older Viscosity | The Lost Abbey | Russian Imperial Stout | 12.0% |
| Older Viscosity | Port Brewing Company | American Imperial Stout | 12.0% |
| Oldest Viscosity | The Lost Abbey | American Stout | 12.0% |
| Oldest Viscosity | Port Brewing Company | American Imperial Stout | 12.0% |
| Oldmanbearma | Mortalis | Imperial IPA | 8.0% |
| The Oligarch | Breakside Brewery | American Imperial Stout | |
| Oliver / Stillwater - People Power | Stillwater Artisanal / Oliver Brewing | American Pale Ale | 6.0% |
| Oliver ESB | Wharf Rat | Extra Special / Strong Bitter (ESB) | |