Bands
| Title | City | Information | Category |
|---|---|---|---|
| Morningside Middle School | Middle School | ||
| Moultrie Middle School | Middle School | ||
| Mount Pleasant High School | High School | ||
| Mount Pleasant Middle School | Middle School | ||
| Muller Road Middle School | Middle School | ||
| Mullins High School | High School | ||
| Myrtle Beach High School | High School | ||
| Myrtle Beach Middle School | Middle School | ||
| Myrtle Beach Middle School | Middle School | ||
| Nation Ford High School | High School |