| Abbreviation | Definition |
|---|---|
| OHS | Oakland High School |
| OHS | Oakleaf High School |
| OHS | Oakley High School |
| OHS | Oakmont High School |
| OHS | Oakville High School |
| OHS | Oakwood High School |
| OHS | Oceana High School |
| OHS | Oceanside High School |
| OHS | Oconomowoc High School |
| OHS | Odessa High School |
| OHS | Okeechobee High School |
| OHS | Olentangy High School |
| OHS | Olympia High School |
| OHS | Olympic High School, Charlotte, North Carolina |
| OHS | Onehunga High School |
| OHS | Online High School |
| OHS | Ontario High School |
| OHS | Ooltewah High School |
| OHS | Opelika High School |
| OHS | Orange High School |