| Odyssey Imperial IPA | Sly Fox Brewing Company | Imperial IPA | 8.4% |
| Oeanside White IPA | Tomoka Brewing Company | American IPA | 6.5% |
| Oerbier | Brouwerij De Dolle Brouwers | Belgian Dark Strong Ale | 9.0% |
| Oerbier Special Reserva | Brouwerij De Dolle Brouwers | Flanders Oud Bruin | 13.0% |
| Oerbier Special Reserva 2002 | Brouwerij De Dolle Brouwers | Belgian Dark Strong Ale | 12.0% |
| Oerbier Special Reserva 2006 | Brouwerij De Dolle Brouwers | Flanders Oud Bruin | 13.0% |
| Oerbier Special Reserva 2007 | Brouwerij De Dolle Brouwers | Flanders Oud Bruin | 13.0% |
| Oerbier Special Reserva 2013 | Brouwerij De Dolle Brouwers | Flanders Oud Bruin | 13.0% |
| Oersoep Sergant Pepper | Oersoep | Saison | 7.1% |
| Oesterstout | Scheldebrouwerij | | 8.5% |
| Of Love and Regret | Stillwater Artisanal Ales | Saison | 7.2% |
| Off Hand | Iron Fist Brewing Company | Saison | 6.7% |
| Off KIL Ter Scottish Ale | Olde Main Brewing | | |
| Off the Bark | Sand Devil Brewery | American Porter | 10.2% |
| Off the Cuff | Two Brothers Brewing | American Stout | 7.2% |