| Old Legover | Daleside Brewery | | 4.1% |
| Old LS Barleywine | Water Tower Brewing | | |
| Old Mad Joy | Great Raft Brewing | Baltic Porter | 10.0% |
| Old Man Ale | Coniston Brewing | | 4.8% |
| Old Man Winter Ale | Southern Tier Brewing Co | Altbier | 8.0% |
| Old Man Winter Warmer 2013 | Lake Superior Brewing | | |
| Old Manchester Ale | Marble Brewery | Old Ale | 7.3% |
| Old Marcus Ale | Middle Ages Brewing | Extra Special / Strong Bitter (ESB) | 6.6% |
| Old Market Stout | Upstream Brewing Old Market | American Stout | |
| Old Marley Barleywine | Thomas Hooker Brewing | American Barleywine | 10.0% |
| Old Mephisto | Bryggeriet Djaevlebryg | English Barleywine | 12.0% |
| Old Mill Pond ESB | The Cambridge House | Extra Special / Strong Bitter (ESB) | 6.5% |
| Old Milwaukee | Pabst Brewing Company | American Lager | 4.6% |
| Old Monk 10000 Super Beer | Mohan Breweries and Distilleries, LTD | | |
| Old Monk's Ale | De Struise Brouwers | Quadrupel (Quad) | 10.0% |