| Abbreviations | Meaning |
 | NAR | Nasal Airway Resistance; National Association For Retarded [Children, Citizens]; No Action Required |
| NARA | Narcotics Addict Rehabilitation Act; National Association Of Recovered Alcoholics |
| NARC | Narcotic; National Association For Retarded Children; Nucleus Arcuatus |
| NARCF | National Association Of Residential Care Facilities |
| NARD | National Association Of Retail Druggists |
| NARF | National Association Of Rehabilitation Facilities |
| NARMH | National Association For Rural Mental Health |
| NARS | National Acupuncture Research Society |
| NAS | National Academy Of Sciences |
| NAS | National Association Of Sanitarians |
| NAS-NRC | National Academy Of Science-National Research Council |
| NASD | National Association Of Schools Of Dance |
| NASE | National Association For The Study Of Epilepsy |
| NASEAN | National Association For State Enrolled Assistant Nurses |
| NASPE | North American Society For Pacing And Electrophysiology |
| NASPE/BPEG | North American Society Of Pacing And Electrophysiology [NASPE]-British Pacing And Electrophysiology Group [BPEG] Pacemaker Coding |
| NASPEM | North American Society For Pediatric Exercise Medicine |
| NASS | North American Spine Society (also: AAOS Related Organizations) |
| NASS | National Accident Sampling System; North American Spine Society |
| NASW | National Association Of Social Workers |
| NATA | National Athletic Trainers Association |
| NAVAPAM | National Association Of Veterans Affairs Physician Ambulatory Care Managers |
| NBCC | National Board Of Certified Counselors; Nevoid Basal Cell Carcinoma |
| NBCOT | National Board For Certification In Occupational Therapy |
| NBME | National Board Of Medical Examiners; Normal Bone Marrow Extract |
| NBOME | National Board Of Osteopathic Medicine Examination |
| NBPME | National Board Of Podiatric Medicine Examiners |
| NBRT | National Board For Respiratory Therapy |
| NCRA | National Cancer Registrars Association (USA) |
| NCSBN | National Council Of State Boards Of Nursing |
| NDA | National Dental Association |
| NDSB | Narcotic Drugs Supervisory Board |
| NEMA | National Eclectic Medical Association |
| NESO | Northeastern Society Of Orthodontists |
| NFA | National Fire Academy; Near-fatal Asthma; Nuclear Factor A |
| NFRA | National Fibromyalgia Research Association (US) |
| NHA | National Health Association |
| NHA | National Hearing Association |
| NHA | National Hemophilia Association |
| NHB | National Health Board |
| NHLA | National Health Lawyers Association |
| NINCDS/ADRDA | National Institute Of Neurological And Communicative Diseases And Stroke/Alzheimer's Disease And Related Disorders Association |
| NIRB | Non-institutional Review Board |
| NKCA | National Kidney Cancer Association (USA) |
| NLA | National Leukemia Association; Neuroleptoanesthesia; Normal Lactase Activity |
| NM(ASCP) | Technologist In Nuclear Medicine Certified By The American Society Of Clinical Pathologists |
| NMA | National Malaria Association; National Medical Association; Neurogenic Muscular Atrophy; N-nitroso-N-methylalanine |
| NMHCA | National Mental Health Consumers' Association |
| NMSS | National Multiple Sclerosis Society |
| NMSS | National Multiple Sclerosis Society; National Mycobacterial Surveillance System [Australia And New Zealand] |
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