| Abbreviation | Definition |
|---|---|
| OC | Office Call |
| OC | Office of the Commissioner |
| OC | Option Chain |
| OCA | Originating Case Agency |
| OCAO | Office of the Chief Acquisition Officer |
| OCB | Organizational Citizenship Behavior |
| OCCC | Office of Consumer Credit Commissioner |
| OCCRP | Organized Crime and Corruption Reporting Project |
| OCD | Office of Civilian Defense |
| OCE | Office of Congressional Ethics |
| OCG | Occupational Classifications Guide |
| OCI | Office of Chief Information |
| OCI | Office of Criminal Investigations (FDA) |
| OCIA | Office of Cyber and Infrastructure Analysis |
| OCIO | Office of Chief Information Officer |
| OCIR | Office of Congressional and Intergovernmental Relations |
| OCL | Office of Community Liaison |
| OCL | Office of Consumer Litigation |
| OCOMM | Office of Communications |
| OCOS | OSHA Compliance & Operational Safety |