| 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% |
| older viscosity | The Lost Abbey | Russian Imperial Stout | 12.0% |
| Older Viscosity | Port Brewing Company | American Imperial Stout | 12.0% |
| Older Viscosity 2013 | Port Brewing Company | | 12.0% |
| The Oligarch | Breakside Brewery | American Imperial Stout | |
| Oliver ESB | Wharf Rat | Extra Special / Strong Bitter (ESB) | |
| Oliver Irish Red | Wharf Rat | Irish Red Ale | |
| Oliver Pagan Porter | Wharf Rat | American Porter | |
| Oliver Twist 20th Anniversary Ale | North Coast Brewing Co. | Doppelbock | 11.6% |
| Oliver's Traditional Cider | Olivers Cider & Perry | | 6.0% |
| Olivia | Monkish Brewing Co. | Wild Ale | 6.8% |
| Olivia 9 | Claim 52 | Belgian Dark Strong Ale | 9.0% |
| Ollopa Dekoorc Eert | Dark Horse Brewing Co. | | |