| Abbreviation | Definition |
|---|---|
| MNYSC | Metro New York and Southern Connecticut |
| MO | issouri |
| MO | Missouri |
| MOAS | Model Organization of American States |
| MOEF | Ministry of Environment and Forests |
| MOM | Middle Of Mitten |
| MOTUS | Mother Of The United States |
| MS | ississippi |
| MS | Mississippi |
| MSCH | Mountain States Childrens Home |
| MSCY | Mason City, Iowa |
| MSDE | Massachusetts State Department of Education |
| MSES | Mountain States Environmental Services |
| MSFA | Mid-States Football Association |
| MSHCA | Mountain States Highland Cattle Association |
| MSPW | Midwestern States Pro Wrestling |
| MSRA | Mid-States Rodeo Association |
| MSSA | Mountain States Stockdog Association |
| MT | Montana |
| MT | ontana |