| User | Location | Total Beers | Unique Beers | Breweries |
|---|---|---|---|---|
| OneDarkCellar (Brewstein77) | Lehigh Valley, PA | 4 | 2 | 2 |
| OneFiver (onefiver) | 105 | 50 | 28 | |
| Onelouderash (onelouderash) | San Francisco, CA | 62 | 48 | 26 |
| OnWisconsin (OnWisconsin) | Green Bay WI | 388 | 120 | 50 |
| ooms (ooms) | South Florida | 54 | 23 | 17 |
| OpaqueEcho | Norman, OK | 7 | 1 | 1 |
| Opsinjoor | 24 | 2 | 1 | |
| OrionToo (Oriontoo) | Denver | 4 | 1 | 1 |
| Orlando (Orramirez6220) | 0 | 0 | 0 | |
| Oskarsson (Clintbeerwood) | Avesta, Sweden | 8 | 6 | 6 |
| Otis (granados14) | 0 | 0 | 0 | |
| OutlandishBrew (topalianc) | Los Angeles, CA | 391 | 183 | 53 |
| Owen (Owen) | Philadelphia, PA | 45 | 41 | 31 |
| Owen (owenbrau) | Columbus, OH | 87 | 48 | 21 |
| Owlwood | Grythyttan, Sweden | 93 | 73 | 56 |