| Abbreviation | Definition |
|---|---|
| NAAB | National Association of Animal Breeders (USA) |
| NAAC | National Association of Agricultural Contractors |
| NABR | National Association for Biomedical Research |
| NABS | North American Bluebird Society |
| NACA | National Animal Control Association |
| NACAM | Netherlands Association for Companion Animal Medicine |
| NACB | National Association of Catering Butchers |
| NACFT | National Association of Cattle Foot Trimmers |
| NADA | new animal drug application |
| NADC | National Animal Disease Center (US Department of Agriculture) |
| NADIS | National Animal Disease Information Service |
| NAERIC | North American Equine Ranching Information Council |
| NAFBE | National Association of Farriers, Blacksmiths and Engineers |
| NAFM | National Association of Farmers' Markets |
| NAG | Nominations and Awards Group (of BVA) |
| NAGO | National Association of Greyhound Owners |
| NAHC | National Anti- Hunt Campaign |
| NAHIS | National Animal Health Information System |
| NAHRS | National Animal Health Reporting System |
| NAIA | National Animal Interest Alliance |