| Abbreviation | Definition |
|---|---|
| NAA | National Aquaculture Association |
| NABR | National Association for Biomedical Research |
| NACCHO | National Association of County and City Health Officials |
| NACDS | National Association of Chain Drug Stores |
| NACHO | National Association of County Health Officials |
| NACMCF | National Advisory Committee on Microbiological Criteria for Foods |
| NAD | NED Animal Drug number |
| NADA | New Animal Drug Application |
| NADE | New Animal Drug Evaluation |
| NAET | Nutrition Assessment and Evaluation Team |
| NAET(CFSAN) | Nutrition Assessment and Evaluation Team (CFSAN) |
| NAF | Notice of Adverse Findings |
| NAFTA | North American Free Trade Agreement |
| NAGC | National Association of Government Communicators |
| NAHC | National Advisory Health Council |
| NAHMS | National Animal Health Monitoring System |
| NAI | No Action Indicated |
| NAION | non-arteritic anterior ischemic optic neuropathy |
| NAL | National Agricultural Library |
| NALBOH | National Association of Local Boards of Health |