| Abbreviation | Definition |
|---|---|
| MUBS | Makerere University Business School |
| MUBS | Middlesex University Business School |
| MUHS | Marquette University High School |
| MUR | Murdock School |
| MUSD | Madera Unified School District |
| MUSD | Marana Unified School District |
| MUSD | Martinez Unified School District |
| MUSD | Mendocino Unified School District |
| MUSD | Middletown Unified School District |
| MUSD | Milpitas Unified School District |
| MUSD | Monrovia Unified School District |
| MUSD | Montebello Unified School District |
| MUSD | Moorpark Unified School District |
| MUSD | Morongo Unified School District |
| MUSS | Manchester United Soccer Schools |
| MVGS | Mountain Vista Governor's School |
| MVHS | Manchester Valley High School |
| MVHS | Marsh Valley High School |
| MVHS | Medomak Valley High School |
| MVHS | Mercy Vocational High School |