| Abbreviation | Definition |
|---|---|
| NB | Nocturnal Breeder |
| NBA | National Bison Association (USA) |
| NBBG | Nebraska Behavioral Biology Group |
| NBC | National Broiler Council |
| NBEC | National Board Examination Committee for Veterinary Medicine |
| NBIC | National Biotechnology Information Center (USA) |
| NCAH | National Centers for Animal Health |
| NCBA | National Cattlemen's Beef Association |
| NCBS | National Cage Bird Show |
| NCC | National Cat Corporation |
| NCDL | National Canine Defence League (obsolete: now Dogs Trust) |
| NCPGA | National Contract Poultry Growers Association |
| NCRHI | National Council for Reliable Health Information (USA) |
| NCRR | National Center for Research Resources (USA) |
| NCVEI | National Commission on Veterinary Economic Issues |
| NCVMA | North Carolina Veterinary Medical Association |
| NCVQ | National Council for Vocational Qualifications. (see also NVQ) |
| NDC | National Dairy Council |
| NDFAS | National Dairy Farm Assurance Scheme |
| NDHIA | National Dairy Herd Improvement Association (USA) |