| Abbreviation | Definition |
|---|---|
| OTHS | Ottawa Technical High School |
| OTHS | Ottawa Township High School |
| OTIS | On Time In School |
| OTMS | Osage Trail Middle School |
| OTMS | Overland Trail Middle School |
| OTSS | Ottawa Technical Secondary School |
| OUSD | Oakland Unified School District |
| OUSD | Oakland Unified School District's |
| OUSD | Oceanside Unified School District |
| OUSD | Orange Unified School District |
| OVD | Ohio Valley District |
| OVES | Oak View Elementary School |
| OVES | Oley Valley Elementary School |
| OVHS | Ocean View High School |
| OVHS | Ocean View Hills School |
| OVHS | Oley Valley High School |
| OVHS | Orchard View High School |
| OVMS | Old Vail Middle School |
| OVOP | One Village One Preschool |
| OVS | Ojai Valley School |