Medical Organizations
- Missouri Chiropractic Physicians Association (MCPA)
- Missouri Mental Health Counselors Association (MMHCA)
- Missouri Psychological Association (MOPA)
- Missouri State Medical Association (MSMA)
- Montana Academy of Physician Assistants (MTAPA)
- Montana Association of Acupuncture and Oriental Medicine (MAAOM)
- Montana Association of Naturopathic Physicians (MANP)
- Montana Medical Association (MMA)
- Moretz Surgical Society (MSS)
- Morris County Psychological Association (MCPA)
- Mulligan Concept Teacher's Association (MCTA)
- Multiple Sclerosis Association of America (MSAA)
- Nashville Psychotherapy Institute (NPI)
- National Abortion Rights Action League (NARAL)
- National Academy of Medicine (NAOM)
- National Academy of Neuropsychology (NAN)
- National Academy of Sciences (NAS)
- National Academy of Sports Medicine (NASM)
- National Acupuncture Detoxification Association (NADA)
- National Advisory Committee on Radiation (NACOR)
- National Aeronautics and Space Administration (NASA)
- National Alliance of Wound Care and Ostomy (NAWCO)
- National Alliance on Mental Illness (NAMI)
- National Anger Management Association (NAMA)
- National Arab American Medical Association (NAAMA)
- National Association for Ambulatory Urgent Care (NAAUC)
- National Association for Healthcare Quality (NAHQ)
- National Association for Holistic Aromatherapy (NAHA)
- National Association for Practical Nurse Education and Service (NAPNES)
- National Association for Retarded Children (NARC)
- National Association for Sport and Physical Education (NASPE)
- National Association for State Enrolled Assistant Nurses (NASEAN)
- National Association for the Prevention of Tuberculosis (UK) (NAPT)
- National Association for the Study of Epilepsy (NASE)
- National Association of Certified Professional Midwives (NACPM)
- National Association of Cognitive-Behavioral Therapists (NACBT)
- National Association of Dental Laboratories (NADL)
- National Association of Family Planning Doctors (UK) (NAFPD)
- National Association of Forensic Counselors (NAFC)
- National Association of Hispanic Nurses (NAHN)
- National Association of Nurse Practitioners in Women’s Health (NPWH)
- National Association of Nutrition Professionals (NANP)
- National Association of Orthopaedic Nurses (NAON)
- National Association of Pediatric Nurse Practitioners (NAPNP)
- National Association of Physical Therapists (NAPT)
- National Association of Psychiatric Health Systems (NAPHS)
- National Association of Retail Druggists (NARD)
- National Association of School Psychologists (NASP)
- National Association of Social Workers (NASW)
- National Association of Veterinary Technicians in America (NAVTA)
- National Athletic Trainer's Association (NATA)
- National Audio-Visual Aids Centre (UK) (NAVAC)
- National Audio-Visual Association (NAVA)
- National Ayurvedic Medical Association (NAMA)
- National Board for Certification in Hearing Instrument Sciences (NBC-HIS)
- National Board for Certification in Occupational Therapy (NBCOT)
- National Board for Certified Counselors (NBCC)
- National Board for Respiratory Care (NBRC)
- National Board for Respiratory Therapy (NBRT)
- National Board of Medical Examiners (NBME)
- National Board of Physicians and Surgeons (NBPAS)
- National Cancer Institute (NCI)
- National Cancer Institute of Canada (NCIC)
- National Catholic Bioethics Center (NCBC)
- National Center for Complementary and Alternative Medicine (NCCAM)
- National Center for Education Statistics (NCES)
- National Center for Health Services Research (NCHSR)
- National Center for Health Statistics (NCHS)
- National Center for Homeopathy (NCH)
- National Center for Physical Activity and Disability (NCHPAD)
- National Certification Board for Therapeutic Massage & Bodywork (NCBTMB)
- National Certification Commission for Acupuncture and Oriental Medicine (NCCAOM)
- National Certification Commission for Addiction Professionals (NCC AP)
- National Chemical Laboratory (NCL)
- National Child Safety Council (NCSC)
- National Cholesterol Education Program (NCEP)
- National Christian Counselors Association (NCCA)
- National Clearinghouse for Mental Health Information (NCMHI)
- National Collection of Industrial, Food and Marine Bacteria (NCIB)
- National College of Education (NCE)
- National Commission for the Study of Nursing and Nursing Education (NCSNNE)
- National Commission on Certification of Physician Assistants (NCCPA)
- National Committee for Mental Health (NCMH)
- National Committee for Research in Neurological Diseases (NCRND)
- National Committee on Radiation Protection and Measurements (NCRPM)
- National Comprehensive Cancer Network (NCCN)
- National Cooperative Crohn's Disease Study (NCCDS)
- National Council for Therapeutic Recreation Certification (NCTRC)
- National Council of Certified Dementia Practitioners (NCCDP)
- National Council of Nurses (NCN)
- National Council on Aging (NCOA)
- National Cystic Fibrosis Research Foundation (NCFRF)
- National Defense Medical Center (NDMC)
- National Dental Association (NDA)
- National Diabetes Advisory Board (NDAB)
- National Diabetes Data Group (NDDG)
- National Eating Disorder Association (NEDA)
- National Eclectic Medical Association (NEMA)
- National Epilepsy League (NEL)
- National Eye Institute (NEI)