| Abbreviation | Definition |
|---|---|
| MF | Membrane Filtration |
| MFPA | Malaysia Fire Protection Association |
| MFPA | Managed Forest Plan Approver |
| MFPP | Model Forest Policy Program |
| MFR | Melt Flow Rate |
| MFZ | Mercury-Free Zone |
| MGD | Millions of Gallons per Day |
| MGNE | Monotype Guild of New England |
| MGNG | Merge Growing Neural Gas |
| MHAU | Major Hazards Assessment Unit |
| MHE | Master Home Environmentalist |
| MHSW | Municipal Hazardous or Special Waste |
| MICAP | Mining Industry Climate Action Plan |
| MINAS | Minimum National Standards |
| MIW | Mishandling Industrial Waste |
| MIWA | Marine and Inland Waters Administration (State Environmental Service; Ministry of Environment; Latvia) |
| MLCG | Marine Life Care Group (Malta) |
| MMD | Man-Made Disaster |
| MMPA | Marine Mammal Protection Act |
| MMRCA | Merriam Mountain Resource Conservation Area |