| Abbreviation | Definition |
|---|---|
| MMDA | Madras Metropolitan Development Authority |
| MMDA | Metro Manila Development Authority |
| MMIA | Montana Municipal Interlocal Authority |
| MMUA | Monroe Municipal Utilities Authority |
| MNA | Member National Authorities |
| MNA | Member National Authority |
| MNAA | Metropolitan Nashville Airport Authority |
| MODI | Man Of Developing India |
| MPA | Modified Points Of Authority |
| MPAF | Maritime And Ports Authority Of Fiji |
| MPAS | Maritime and Port Authority of Singapore |
| MPEA | Metropolitan Pier and Exposition Authority |
| MPWH | Ministry of Public Works and Housing |
| MRA | Motor Registration Authority |
| MRDA | Maine Rural Development Authority |
| MRDA | Makkah Region Development Authority |
| MRTA | Mass Rapid Transit Authority |
| MRTA | Montachusett Regional Transit Authority |
| MSA | Malta Standards Authority |
| MSAF | Maritime Safety Authority of Fiji |