| Acronym |
Definition |
| M2 | Square meter |
| M3 | Cubic meter |
| MarDPW | Marianas Department of Public Works (Commonwealth of Northern Marianas Islands - CNMI) |
| MassHwy | Massachusetts Highway Department |
| MBF | Thousand Board Feet |
| MBQAST | Multi-Branch Quality Action Support Team |
| MDNR&C | Montana Department of Natural Resources and Conservation |
| MDOT | Montana Department of Transportation |
| MDOT | Michigan Department of Transportation |
| MDOT | Maryland Department of Transportation |
| MDOT | Maine Department of Transportation |
| MDT | Montana Department of Transportation |
| mi | Mile |
| MIC | Metlakatla Indian Community |
| mm | Millimeter |
| MMBF | Million Board Feet |
| Mn/DOT | Minnesota Department of Transportation |
| MOA | Memorandum of Agreement |
| MoDOT | Missouri Department of Transportation |
| MORA | Mount Rainier National Park |
| MOU | Memorandum of Understanding |
| MP | Milepost |
| MPDES | Montana Pollution Discharge Elimination System |
| MPO | Metropolitan Planning Organization |
| MSHD | Mississippi Department of Transportation |
| MSHPO | Montana State Historic Preservation Officer |
| MTMC | Military Traffic Management Command |
| MUTCD | Manual on Uniform Traffic Control Devices |
