| OCIA | Office of Congressional and Intergovernmental Affairs 
| Others |
| OCIA | Office of Cyber and Infrastructure Analysis
| Others |
| OCIA | Oklahoma Capitol Improvement Authority
| Others |
| OCIA | Oklahoma Certified Installers Association
| Others |
| OCIA | Oklahoma Crop Improvement Association
| Others |
| OCIA | Optically Coupled Interface Adapter
| Others |
| OCIA | Opto-Coupled Interface Adapter
| Others |
| OCIA | Oregon Commercial Insurance Agency
| Others |
| OCIA | Organic Crop Improvement Association
| Others |
| OCIA | Orphan Children In Action
| Others |
| OCIA | Ovarian Carcinoma Immunoreactive Antigen
| Others |
| OCIA | OverClock Intelligence Agency
| Others |