| Abbreviation | Definition |
|---|---|
| OBDC | Only Babes Dive Club |
| OBDC | Oregon Ballroom Dance Club |
| OBFC | Official Blue Fan Club |
| OBMC | Ocean Beach Malibu Club |
| OBSC | Oak Brook Soccer Club |
| OBSC | Old Boys Social Club |
| OBSC | Ormond Beach Soccer Club |
| OBSC | Osler Bluff Ski Club |
| OBSC | Outer Banks Sports Club |
| OBWC | Oak Brook Women's Club |
| OCAC | Oil Capitol Auto Club |
| OCAC | Oxford City Athletic Club |
| OCBC | Oklahoma City Boat Club |
| OCCB | Oxford and Cambridge Club of Beijing |
| OCCC | Orlando Canine Country Club's |
| OCJ | Outdoor Club Japan |
| OCM | Outils Club Moteurs |
| OCMB | Oriëntatie Club MIDDEN BRABANT |
| OCMC | Orange County Mustang Club |
| OCOD | Obedience Club of Daytona |