| Abbreviations | Meaning |
 | NASOG | National Association Of Specialist Obstetricians & Gynaecologists |
| NASP | National Association Of School Psychologists |
| NASPE | North American Society Of Pacing And Electrophysiology |
| NASPEM | North American Society For Pediatric Exercise Medicine |
| NASPGHAN | North American Society For Pediatric Gastroenterology Hepatology, And Nutrition |
| NASPHV | National Association Of State Public Health Veterinarians |
| NASPSPA | North American Society For The Psychology Of Sport And Physical Activity |
| NASS | North American Spine Society |
| NASTAD | National Alliance Of State & Territorial AIDS Directors |
| NASW | National Association Of Social Workers |
| NAT | National AIDS Trust |
| NATA | Network For Advancement Of Transfusion Alternatives |
| NATCO | Organization For Transplant Professionals |
| NATHNAC | National Travel Health Network And Centre |
| NATIONS | National Tobacco Information Online System |
| NATN | National Association Of Theatre Nurses |
| NAVBC | National Agricultural And Veterinary Biotechnology Centre (Ireland) |
| NAVC | North American Veterinary Conference |
| NAVCA | North American Veterinary College Administrators |
| NAVH | National Association For Visually Handicapped |
| NAVLE | North American Veterinary Licensing Examination |
| NAVS | National Anti-Vivisection Society |
| NAVS | North American Vegetarian Society |
| NAVTA | National Association Of Veterinary Technicians In America |
| NAWHO | National Asian Women's Health Organization |
| NBAC | National Bioethics Advisory Commission |
| NBAO | New Brunswick Association Of Optometrists. Association Des Optométristes Du Nouveau-Brunswick |
| NBART | New Brunswick Association Of Respiratory Therapists |
| NBBCN | New Brunswick Breast Cancer Network |
| NBBG | Nebraska Behavioral Biology Group |
| NBC | National Board For Cerfication In Dental Laboratory Technology |
| NBCC | National Board For Certified Counselors |
| NBCC | National Breast Cancer Coalition |
| NBCCEDP | National Breast And Cervical Cancer Early Detection Program |
| NBCCF | National Breast Cancer Coalition Fund |
| NBCDI | National Black Child Development Institute |
| NBCH | National Business Coalition On Health |
| NBCHPN | National Board For Certification Of Hospice & Palliative Nurses |
| NBCOT | National Board For Certification In Occupational Therapy |
| NBDAA / AADNB | New Brunswick Dental Assistants Association / Association Des Assistants Et Assistantes Dentaires Du Nouveau-Brunswick |
| NBDE | National Board Dental Examination |
| NBDHE | National Board Dental Hygiene Examination |
| NBDHMT | National Board Of Diving And Hyperbaric Medical Technology |
| NBDS | New Brunswick Dental Society. Société Dentaire Du Nouveau-Brunswick |
| NBHC | National Bone Health Campaign |
| NBHE | National Board Of Homeopathic Examiners |
| NBIF | National Biotechnology Information Facility |
| NBII | National Biological Information Infrastructure |
| NBLIC | National Black Leadership Initiative On Cancer |
| NBME | National Board Of Medical Examiners |
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