| Abbreviation | Definition |
|---|---|
| NISER | Nepal Institute For Social Environmental Research |
| NITES | Naval Integrated Tactical Environmental System |
| NJDEP | New Jersey Department of Environmental Protection |
| NLEE | Newfoundland and Labrador Environmental Educators |
| NLFR | New Life Furniture Recycling |
| NLR | Northeast Lamp Recycling |
| NMOG | Non-Methane Organic Gases |
| NMRC | New Mexico Recycling Coalition |
| NMW | Northeastern Minnesotans for Wilderness |
| NOC | National Oceanology Centre |
| NOES | National Occupational Exposure Survey |
| NOPD | Notice of Proposed Development |
| NOPE | Not On Planet Earth |
| NOPP | National Oceanographic Partnership Program |
| NOPP | National Office of Pollution Prevention |
| NOPSEMA | National Offshore Petroleum Safety and Enviromental Management Authority |
| NORM | National Organochlorine Residue Management |
| NPCA | Niagara Peninsula Conservation Authority [Ontario, Canada] |
| NPCB | Nagaland Pollution Control Board |
| NPDES | National Pollutant Discharge Elimination System |