| Abbreviation | Definition |
|---|---|
| OCHS | Oldham County High School |
| OCHS | Orange Cove High School |
| OCHS | Oregon City High School |
| OCHS | Own Character High School |
| OCIS | Ocean City Intermediate School |
| OCPS | Oconee County Primary School |
| OCPS | Osceola County Public Schools |
| OCRS | Oak Creek Ranch School |
| OCS | Oakland Christian School |
| OCS | Oconee County Schools |
| OCS | Officer Cadet School |
| OCS | Officer Candidate School |
| OCS | Officer Candidates School |
| OCS | Onondaga Central School |
| OCS | Onondaga Central Schools |
| OCSA | Orange County School of the Arts |
| OCSD | Oregon City School District |
| OCTS | Office for Career and Technical Schools |
| ODCS | Old Dominion Christian School |
| ODCS | Open Door Christian School |