| Ook Best Lekker! | Brouwerij De Molen | Wild Ale | 6.5% |
| Oompa Loompa | Fat Head's Brewery & Saloon | American Stout | 6.5% |
| Oompa Loompa Chocolate Stout | Rocky River Brewing | | |
| OOOMGS | 450 North Brewing Company | Fruited Kettle Sour | 4.5% |
| Oops! All | DSSOLVR | | |
| Oopsie Dhazy! | Knee Deep Brewing | New England IPA | 6.8% |
| Oort | Ecliptic Brewing Company | American Imperial Stout | 8.5% |
| Oort Cloud | To Øl | New England IPA | 4.5% |
| Oosik Amber Ale | Midnight Sun Brewing Co. | American Amber / Red Ale | 5.0% |
| Op & Top | Brouwerij De Molen | English IPA | 4.5% |
| Op Den Ophef | Stadsbrouwerij 013 | Dubbel | 7.0% |
| Opacus Stout | StormBreaker | Oatmeal Stout | 5.0% |
| Opal | Cigar City Brewing | | |
| Opal | Firestone Walker Brewing Co. | Saison | 7.5% |
| Opaque | Akia Brygghus | | |