| Abbreviation | Definition |
|---|---|
| MPU | Michigan Public Utilities |
| MQC | Michigan Quality Council |
| MQI | Minnesota Quality Initiative |
| MR | Mystic River |
| MRAP | Myriad Reimbursement Assistance Program |
| MRBCA | Missouri Risk-Based Corrective Action |
| MRC | Municipal Regional County |
| MRHA | Metropolitan Regional Housing Authority |
| MRI | Ministry of Research and Innovation |
| MRIC | Mississippi River Industrial Corridor |
| MRIC | Municipal Resettlement Implementation Committee |
| MRIP | Massachusetts Resource Identification Project |
| MRIP | Michigan Recovery Implementation Plan |
| MRIP | Michigan Resource Inventory Program |
| MRIP | Minnesota River Initiative Project |
| MRPI | Michigan Rural Property Inventory |
| MRRA | Midcoast Regional Redevelopment Authority |
| MRSL | Mosley Road Sanitary Landfill |
| MRSP | Myakka River State Park |
| MRU | Mountain Rescue Unit |