| Abbreviation | Definition |
|---|---|
| OEMC | Old English Mastiff Club |
| OFC | Obama Fan Club |
| OFC | Oklahoma Football Club |
| OFCC | Ordo Fanaticus Club Challenge |
| OFFC | Overlake Fly Fishing Club |
| OFRC | Odd Fellows Recreation Club |
| OFRC | Old Framlinghamians Rifle Club |
| OGC | Olympique Gymnaste Club |
| OGCN | Olympique Gymnaste Club Nice |
| OHAC | Orchard Hills Athletic Club |
| OHAC | Outdoor High Adventure Club |
| OHC | Olympia Hostel Club |
| OHC | Ostbayerischer Handball Club |
| OHCC | Oak Harbor Conservation Club |
| OHCC | Oak Hill Country Club |
| OHCC | Oakland Hills Country Club |
| OHCC | Ocean Hills Country Club |
| OHCC | Old Hickory Country Club |
| OHCC | Old Hill Cricket Club |
| OHCC | Orchard Hills Country Club |