| Abbreviation | Definition |
|---|---|
| NDSDF | National Disaster Search Dog Foundation (USA) |
| NERN | National Equine Research Network |
| NEUT | Neutered |
| NEVA | North of England Veterinary Association |
| NEVG | Northern Exotics Veterinary Group |
| NEWC | National Equine Welfare Council |
| NFBG | National Federation of Badger Groups |
| NFI | National Fisheries Institute (USA) |
| NFUS | National Farmers Union of Scotland |
| NGF | National Greyhound Foundation |
| NGRC | National Greyhound Racing Council |
| NGVS | North Georgia Veterinary Specialists |
| NHC | National Hamster Council |
| NHC | National Hamster Council ( U K) |
| NIAB | National Institute of Agricultural Botany |
| NIAH | National Institute of Animal Health (Japan) |
| NIBSC | National Institute for Biological Standards and Control (UK) |
| NICE | National Institute for Clinical Excellence |
| NICVBP | National Institute for Control of Veterinary Bioproducts and Pharmaceuticals |
| NIG | National Institute of Genetics Genetic Resources Laboratory (Shigen-Japan) |