| Oneida | Modern Times | American Pale Ale | 5.8% |
| Ones & Twos | Coos Brewing Company | Saison | 5.8% |
| Onesie Citra | Lone Pine Brewing Company | American IPA | 6.5% |
| Ongedorst | Antidoot - Wilde Fermenten | | |
| Ongelovige Thomas | Jopen | Quadrupel (Quad) | 10.0% |
| Ongelovige Thomas Oaked & Whisky Infused | Jopen | Quadrupel (Quad) | 10.0% |
| Oni | Old Irving Brewing Co. | European Pale Lager | 5.9% |
| Onirique | Pryes Brewing | Wild Ale | 11.0% |
| Only A Spark | Magnify Brewing | | |
| Only Brewed 4 Cuban Linx | Strangeways Brewing | Wild Ale | 5.0% |
| The Only Oat Malt Stout In The World | Maclay and Co. | American Stout | |
| Only Schip Worth a Damn | Snipes Mountain / Telegraph / Perennial / Urban Family | | |
| The Only Schip Worth a Damn | Urban Family Brewing | Wild Ale | 6.3% |
| Only Time Will Tell | Magnify Brewing | | |
| Only Void (coffee) | Tired Hands | American Barleywine | 11.0% |