| Abbreviation | Definition |
|---|---|
| MDLA | Massachusetts Defense Lawyers Association |
| MDLA | Midwest Dental Laboratory Association |
| MDNA | Machinery Dealer National Association |
| MDNA | Metropolitan Districts Netball Association |
| MDPA | Montana Defensive Pistol Association |
| MDPA | Mt Diablo Pilots Association |
| MDRA | Malta Drag Racing Association |
| MDRA | Maryland Delaware Rocketry Association |
| MDRA | Mason Dixon Riders Association |
| MDRA | Metropolitan District Rifle Association |
| MDRA | Minnesota Deputy Registrar's Association |
| MDRA | Minnesota Distance Running Association |
| MDRA | Montana Drag Racers Association |
| MDRA | Motorcycle Drag Racing Association |
| MDSA | Milwaukee Deputy Sheriff's Association |
| MDSA | Myanmar Down Syndrome Association |
| MDTA | Minnesota Debate Teachers Association |
| MDTA | Minnesota Dental Therapy Association |
| MDTA | Missouri Dump Truckers Association |
| MDVA | Michigan Distributors and Vendors Association |