MSHS
- Homeland security
- List of Michigan State Historic Sites
- MacGregor State High School
- Mackay State High School
- Manila Science High School
- Marikina Science High School
- Maris Stella High School
- Marsden State High School
- Master of Health Science
- Melville Senior High School
- Miami High School (Miami, Florida)
- Minglanilla Science High School
- Mirrabooka Senior High School
- Morley Senior High School
- Mount Stromlo High School
- Muntinlupa Science High School