| NAAA |
National Agricultural Aviation Association |
| NAAREF |
National Agricultural Aviation Research and Education Foundation |
| NAFTA |
North American Free Trade Agreement |
| NAHMMA |
North American Hazardous Materials Management Association |
| NAPIAP |
National Agricultural Pesticide Impact Assessment Program |
| NAS |
National Academy of Sciences |
| NASD |
National Ag Safety Database |
| NASDA |
National Association of State Departments of Agriculture |
| NASDARF |
National Association of State Departments of Agriculture Research Foundation |
| NASS |
National Agricultural Statistics Service |
| NASULGC |
National Association of State Universities and Land-Grant Colleges |
| NCAMP |
National Coalition Against the Misuse of Pesticides |
| NCODM |
National Coalition on Drift Minimization |
| NEPA |
National Environment Protection Act |
| NFPA |
National Fire Protection Association |
| NGO |
Nongovernmental Organization |
| NIEHS |
National Institute of Environmental Health Sciences |
| NIFA |
National Institute of Food and Agriculture (USDA) |
| NIH |
National Institutes of Health |
| NIOSH |
National Institute for Occupational Safety and Health |
| NOAA |
National Oceanic and Atmospheric Administration |
| NOAEL |
No Observable Adverse Effect Level |
| NOEL |
No Observable Effect Level |
| NOER |
No Obervable Effect Rate |
| NOIC |
Notice of Intent to Cancel (EPA) |
| NOIS |
Notice of Intent to Suspend (EPA) |
| NOP |
National Standards on Organic Production and Handling |
| NPDES |
National Pollutant Discharge Elimination System |
| NPIC |
National Pesticide Information Center |
| NPIRS |
National Pesticide Information Retrieval System |
| NPMA |
National Pest Management Association |
| NPRM |
Notice of Proposed Rule Making |
| NPTN |
National Pesticide Telecommunications Network (former name of NPIC) |
| NRC |
National Research Council |
| NRCS |
Natural Resources Conservation Service (USDA) |
| NRP |
National Response Plan |
| NTE |
Not to Exceed |
| NTIS |
National Technical Information Service |
| NTP |
National Toxicology Program |