| Abbreviation | Definition |
|---|---|
| MQM | Mutahedda Qaumi Movement |
| MQM | Muttahida Quami Movement |
| MRDD | Movement for the Restoration and Defence of Democracy |
| MRP | Mississippi Republican Party |
| MRPP | Reorganized Movement of the Party of the Proletariat |
| MRSC | Michigan Republican State Committee |
| MSIF | Main Street Individual Fund |
| MSM | Mouvement Socialiste Militant |
| MSN | Mexico Solidarity Network |
| MSNM | Main-Stream News Media |
| MSO | Mitch Schneider Organization |
| MSPR | Malikussaleh Social and Political Reviews |
| MSSD | Michigan Spanish Speaking Democrats |
| MSSR | Moldavian Soviet Socialist Republic |
| MSSR | Moldovan Soviet Socialist Republic |
| MST | Movimento Sem Terra (The Movement of the Landless) |
| MSYV | Massive Yaardvibez |
| MSZP | Magyar Szocialista Párt (Hungarian: Hungarian Socialist Party) |
| MTDS | Mediating Theory And Democratic Systems |
| MTHD | Middle Tennessee Hispanic Democrats |