| Abbreviation | Definition |
|---|---|
| MCDP | Maricopa County Democratic Party |
| MCDP | Mecklenburg County Democratic Party |
| MCG | Movimiento Comunista de Galicia |
| MCLF | Maine Citizen Leadership Fund |
| MCP | Manipur Congress Party |
| MCRC | Montgomery County Republican Committee |
| MCRP | Madison County Republican Party |
| MCRP | Montgomery County Republican Party |
| MCS | Mix of Church and State |
| MD | Maybe Democrat |
| MD | Mondale and Dukakis |
| MDB | Minimally Distinct Border |
| MDC | Movement for Democratic Change |
| MDJ | Movement for Democracy and Justice |
| MDLP | Movimento Democrático de Libertação de Portugal |
| MDP | Maldivian Democratic Party |
| MDP | Michigan Democratic Party |
| MDR | Movement for Democratic Renewal |
| ME | Myanmar Era |
| MEB | Multi-Ethnic Britain |