| Abbreviation | Definition |
|---|---|
| OBT | Ohio Bell Telephone |
| OBT | Orgain, Bell, Tucker, L.L.P. |
| OBT | Orlando's Best Tourism |
| OBTC | Old Barrel Tea Company |
| OBV | Orient Buch Vertrieb |
| OBVG | Outer Banks Visitors Guide |
| OBW | OneBlueWorld, Inc. |
| OBW | OneBlueWorld, Incorporated |
| OC | Of Christ |
| OC | Old Colony |
| OC | Opportunity and Challenge |
| OC | Orfevrerie Christofle |
| OC | Owens Corning |
| OCB | Oregon Coast Business |
| OCC | Oklahoma Corporation Commission |
| OCC | Optical Cable Corporation |
| OCC | Orange County Choppers |
| OCCB | Orange County Circuit Breakers |
| OCCD | Office for Commercialization and Corporate Development |
| OCCG | Office of Community and Charitable Giving |