| Abbreviation | Definition |
|---|---|
| MCSS | Mudgeeraba Creek State School |
| MCTS | Mercer County Technical Schools |
| MDCPS | Miami-dade County Public Schools |
| M-DCPS | Miami-Dade County Public Schools |
| MDHS | Markham District High School |
| MDHS | Mater Dei High School |
| MDHS | McCall Donnelly High School |
| MDHS | Milton District High School |
| MDHS | Mitchell District High School |
| MDHS | Monsignor Donovan High School |
| MDHS | Mount Dora High School |
| MDHS | Mount Douglas High School |
| MDHS | Mt Diablo High School |
| MDHSS | Mahirshi Dayanand High Secondary School |
| MDIHS | Mount Desert Island High School |
| MDIS | Metro Delhi International School |
| MDPS | Madison District Public Schools |
| ME | Mary Eyre Elementary School |
| MEAB | Montessori Evaluation and Accreditation Board |
| MEHE | Ministry of Education and Higher Education |