| Abbreviation | Definition |
|---|---|
| OTBC | Ocean Towers Beach Club |
| OTBC | Old Town Barber Club |
| OTBC | Old Town Blues Club |
| OTBFC | Our True Blood Fan Club |
| OTCC | Obedience Training Club of Chugiak |
| OTCC | Oundle Town Cricket Club |
| OTCC | Outdoor Traders Cycling Club |
| OTCH | Obedience Training Club of Hawaii |
| OTCWL | Official Tournament and Club Word List |
| OTFC | Old Tiffinians Football Club |
| OTFC | Online Thalapathy Fans Club |
| OTHC | Oberhausener Tennis und Hockey Club |
| OTOC | Oregon Toyota Owners Club |
| OTTC | Ottawa Table Tennis Club |
| OUBC | Oxford University Boat Club |
| OUCC | Oxford University Cave Club |
| OUCC | Oxford University Chess Club |
| OUCC | Oxford University Cricket Club |
| OUCC | Oxford University Cycling Club |
| OUDC | Oxford University Dancesport Club |