| Abbreviation | Definition |
|---|---|
| MHS | McDowell High School |
| MHS | McMinnville High School |
| MHS | Mead High School |
| MHS | Meadville High School |
| MHS | Memorial High School |
| MHS | Mendon High School |
| MHS | Menomonie High School |
| MHS | Merced High School |
| MHS | Mesquite High School |
| MHS | Methuen High School |
| MHS | Metropolitan High School |
| MHS | Miami High School |
| MHS | Middleton High School |
| MHS | Midway High School |
| MHS | Milford High School |
| MHS | Millbrook High School |
| MHS | Millennium High School |
| MHS | Milpitas High School |
| MHS | Milton Hershey School |
| MHS | Milwaukie High School |