| Acronym | Meaning |
 | MWC | Municipal Waste Combustor(s) |
| MWCO | Molecular Weight Cut-off (in Membrane |
| MWD | Molecular Weight Distribution |
| MWEP | Monofilled Waste Extraction Procedure |
| MWFA | Metalworking Fluids Containing Amines |
| MWH | Mulliken-Wolfsberg-Helmholz (molecular Orbital Method) |
| MWI | Medical Waste Incinerator(s) |
| MWIR | Medium Wavelength IR |
| MWM | Morris Water Maze |
| MWM | Meandering Winding Magnetometer |
| MWNT | Multiwall Nanotube |
| MWP | Mixed Waste Paper |
| MWP | Moving Wave Packet (model For Mol. Scattering) |
| MWPC | Multiwire Proportional Chamber |
| MWTA | Medical Waste Tracking Act |
| MX | 3-chloro-4-(dichloromethyl)-5-hydroxy-2(5H)-furanone |
| MXRF | Micro-beam X-ray Fluorescence |
| MYF5 | Myogenic Factor 5 |
| MZDO | Modified Zero Differential Overlap |
| MZPFGE | Multiple-zone Pulsed-field Gel Electrophoresis |
| N-BOD | Nitrogenous Biochemical Oxygen Demand |
| NAA | Nonattainment Area |
| NAA | Neutron Activation Analysis |
| NAAQS | National Ambient Air Quality Standards |
| NABSA | Nucleic Acid Based Sequence Amplification |
| NACA | National Agricultural Chemicals Association |
| NACCA | North American Council Of Chemical Associations |
| NACCHO | National Association Of County And City Health Officials |
| NACE | National Association Of Corrosion Engineers |
| NACE | Nonaq. Capillary Electrophoresis |
| NACEPT | National Advisory Council For Environmental Policy And Technology |
| NACLA | The National Cooperation For Laboratory Accreditation |
| NACSN | North American Commission On Stratigraphic Nomenclature |
| NAD | Nicotinamide Adenine Dinucleotide |
| NADA | New Animal Drug Application |
| NADAP | National Atmospheric Deposition Assessment Program |
| NADB | National Air Data Branch (US EPA) |
| NADC | National Animal Disease Center |
| NADC | Sodium Deoxycholate |
| NADH | Reduced Nicotinamide Adenine Dinucleotide |
| NADP | National Atmospheric Deposition Program |
| NADP | Nicotinamide Adenine Dinucleotide Phosphate |
| NADW | North Atlantic Deep Water |
| NAEG | Nevada Applied Ecology Group (of US Department Of Energy) |
| NAEP | National Association Of Environmental Professionals |
| NAERG | North American Emergency Response Guidebook |
| NAFTA | North American Free Trade Agreement |
| NAI | Neutral Atom Imaging (astronomical Plasmas) |
| NAICS | North American Industrial Classification System |
| NAIM | Nucleotide Analog Interference Mapping |
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