| Abbreviation | Definition |
|---|---|
| MCTA | Monroe County Taxpayers Association |
| MCWA | Macedonian Community Welfare Association |
| MCWA | McHenry County Wireless Association |
| MCWA | Mesa County Water Association |
| MCYA | Mississippi Coast Yachting Association |
| MDA | Missouri Dental Association |
| MDA | Muff Divers Association |
| MDA | Muscular Dystrophy Associations |
| MDA | Museum Documentation Association |
| MDAA | Massachusetts District Attorneys Association |
| MDAA | Multicultural Disability Advocacy Association |
| MDAM | Mood Disorders Association of Manitoba |
| MDAS | Muscular Dystrophy Association Singapore |
| MDBA | Missouri Dexter Breeders Association |
| MDBA | Mount Diablo Beekeepers Association |
| MDCA | Manchester and District Cricket Association |
| MDFA | Magnet Distributor and Fabricators Association |
| MDFA | Midwest Dairy Foods Association |
| MDFA | Mumbai District Football Association |
| MDIA | Mount Diablo Interpretive Association |