| Abbreviation | Definition |
|---|---|
| OHS | Oregon High School |
| OHS | Orem High School |
| OHS | Oromocto High School |
| OHS | Orosi High School |
| OHS | Oroville High School |
| OHS | Osbourn High School |
| OHS | Osceola High School |
| OHS | Ossining High School |
| OHS | Oswego High School |
| OHS | Ottawa High School |
| OHS | Overhills High School |
| OHS | Overland High School |
| OHS | Oviedo High School |
| OHS | Owasso High School |
| OHS | Owatonna High School |
| OHS | Owensboro High School |
| OHS | Oxford High School |
| OHS | Oxnard High School |
| OHSB | Ohio High School Bowling |
| OHSC | Oakton High School Class |