| Ola Dubh 1991 | Harviestoun Brewery | Old Ale | 10.5% |
| Ola Dubh Special Reserve 12 | Harviestoun Brewery | Old Ale | 8.0% |
| Ola Dubh Special Reserve 16 | Harviestoun Brewery | Old Ale | 8.0% |
| Ola Dubh Special Reserve 18 | Harviestoun Brewery | Old Ale | 8.0% |
| Ola Dubh Special Reserve 21 | Harviestoun Brewery | Old Ale | 10.5% |
| Ola Dubh Special Reserve 30 | Harviestoun Brewery | Old Ale | 8.0% |
| Ola Dubh Special Reserve 30th Anniversary | Harviestoun Brewery | | |
| Ola Dubh Special Reserve 40 | Harviestoun Brewery | Old Ale | 8.0% |
| Olaf The Stout | Hammerheart | | |
| Olas Especiales | Jolly Pumpkin Artisan Ales | Wild Ale | 5.8% |
| Olasz | Tommie Sjef Wild Ales | | |
| Olasz Rizling | Bofkont | | |
| Old #27 Barleywine | Delafield Brewhaus | | |
| Old '99 Barley Wine | Barley Creek Brewing | American Barleywine | 11.0% |
| Old 'Schutes Stock Ale | Deschutes Brewery | Old Ale | 9.6% |