| Oaktoberfest | Black Oak Brewing Co. | Märzen | 5.0% |
| Oaktoberfest | Firestone Walker Brewing Co. | Märzen | |
| Oaktoberfest | Live Oak Brewing | Märzen | |
| Oaktown Brown | Calicraft Brewing Co. | American Brown Ale | 6.7% |
| Oaky Golden Pucker | Jackie O's Pub & Brewery | Wild Ale | |
| Oaky Moaky | Brouwers Verzet | | 7.5% |
| Oamaru Kriek | Craftwork | Fruit Lambic | 6.0% |
| Oarsman | Bell's Brewery, Inc. | Berliner Weisse | 4.0% |
| Oasi | Birrificio Rurale | Belgian Pale Ale | 5.0% |
| Oasis | Tallgrass Brewing Co. | American IPA | 7.2% |
| OASIS 5 Year Blend | Cherry Street Brewing Cooperative | American Imperial Stout | 10.5% |
| Oasis IPA | Night Shift Brewing | American IPA | |
| Oat Cream IPA | Untitled Art | American IPA | 7.0% |
| Oat Float | Barebottle Brewing Company | Imperial IPA | 7.8% |
| Oat Imperial Oatmeal Stout | Southern Tier Brewing Co | American Imperial Stout | 12.5% |