| Abbreviation | Definition |
|---|---|
| MSES | Manitou Springs Elementary School |
| MSES | Mary Scroggs Elementary School |
| MSES | Millbury Street Elementary School |
| MSES | Moorefield Station Elementary School |
| MSFE | Maine Schools for Excellence |
| MSFLC | Midnight Sun Family Learning Center |
| MSGB | Middle School Girls Basketball (various locations) |
| MSGL | Montessori School of Greater Lafayette |
| MSHR | Moscow School of Human Rights |
| MSHS | MacGregor State High School |
| MSHS | Madera South High School |
| MSHS | Madison Southern High School |
| MSHS | Mahomet Seymour High School |
| MSHS | Manila Science High School |
| MSHS | Maple Shade High School |
| MSHS | Marikina Science High School |
| MSHS | Marion Senior High School |
| MSHS | Maris Stella High School |
| MSHS | Marquette Senior High School |
| MSHS | Marquette SeniorHigh School |