| MSHS | MacGregor State High School 
| Others |
| MSHS | Madera South High School
| Others |
| MSHS | Mahomet Seymour High School
| Others |
| MSHS | Manila Science High School
| Others |
| MSHS | Maple Shade High School
| Others |
| MSHS | Marikina Science High School
| Others |
| MSHS | Marion Senior High School
| Others |
| MSHS | Maris Stella High School
| Others |
| MSHS | Marquette Senior High School
| Others |
| MSHS | Marsden State High School
| Others |
| MSHS | Marvel Super Hero Squad
| Others |
| MSHS | Master of Science in Health Sciences
| Others |
| MSHS | Master of Science in Homeland Security
| Others |
| MSHS | Master of Science in Human Services
| Others |
| MSHS | Masters of Science in Health Sciences
| Others |
| MSHS | Mayo School of Health Sciences
| Others |
| MSHS | Melville Senior High School
| Others |
| MSHS | Miami Senior High School
| Others |
| MSHS | Michigan State Historic Sites
| Others |
| MSHS | Mid South Health Systems
| Others |
| MSHS | Millard South High School
| Others |
| MSHS | Minnesota State Horticultural Society
| Others |
| MSHS | Mirrabooka Senior High School
| Others |
| MSHS | Modern Street Hemi Shootout
| Others |
| MSHS | Morley Senior High School
| Others |
| MSHS | Motor Services Hugo Stamp
| Others |
| MSHS | Mount Shasta High School
| Others |
| MSHS | Mount Si High School
| Others |
| MSHS | Mt Shasta High School
| Others |
| MSHS | Mt Spokane High School
| Others |
| MSHS | Multi Stage Hybrid System
| Others |
| MSHS | Muscle Shoals High School
| Others |