| Abbreviation | Definition |
|---|---|
| NTCA | National Tiger Conservation Authority |
| NTCRA | North Texas Corporate Recycling Association |
| NTE | Neutral Thermal Environment |
| NTEL | Northern Territory Environmental Laboratories |
| NTEL | Northern Territory Environmental Laboratory |
| NURE | National Uranium Resource Evaluation |
| NVCA | Native Vegetation Conservation Act (Australia) |
| NVCA | Nottawasaga Valley Conservation Authority |
| NVIRP | Northern Victorian Irrigation Renewal Project (Australia) |
| NVOC | Natural Volatile Organic Compound |
| NW | the National World |
| NWACP | Northwest Area Contingency Plan |
| NWEP | New West Environmental Partners |
| NWEP | New Westminster Environmental Partners |
| NWMO | Nuclear Waste Management Organization |
| NWMO | Nuclear Waste Management Organization (Canada) |
| NWPCA | Narragansett Water Pollution Control Association |
| NWRA | National Waste & Recycling Association |
| NWSS | National Wastewater Surveillance System |
| NWTP | Northern Water Treatment Plant |