Medical Organizations
- Academia de Nutrición y Dietética (AND)
- Academic Pediatric Association (APA)
- Académie Européenne des Sciences, des Arts et des Lettres; European Academy of Sciences, Arts, and Literature (AESAL)
- Academy for Certification of Vision Rehabilitation and Education Professionals (ACVREP)
- Academy for Coaching Parents International (ACPI)
- Academy For Sports Dentistry (ASD)
- Academy of Certified Social Workers (ACSW)
- Academy of Clinical Electrophysiology and Wound Management (ACEWM)
- Academy of Clinical Thyroidologists (ACT)
- Academy of Cognitive and Behavioral Therapies (ACBT)
- Academy of Doctors of Audiology (ADA)
- Academy of General Dentistry (AGD)
- Academy of Integrative Health & Medicine (AIHM)
- Academy of Laser Dentistry (ALD)
- Academy Of Lymphatic Studies (ACOLS)
- Academy of Medical Psychology (AMP)
- Academy of Medical-Surgical Nurses (AMSN)
- Academy of Neurologic Physical Therapy (ANPT)
- Academy of Nursing Education (ANEF)
- Academy of Nutrition and Dietetics (AND)
- Academy of Orthopaedic Physical Therapy (AOPT)
- Academy of Osseointegration (AO)
- Academy of Physical Medicine (UK) (APM)
- Academy of Physicians in Wound Healing (APWH)
- Academy of Psychosomatic Medicine (APM)
- Academy of Religion and Mental Health (ARMH)
- Acceleration Laboratory, Aero Medical (ALAM)
- Accreditation Council for Graduate Medical Education (ACGME)
- Acupuncture Society of America (ASA)
- Acupuncture Society of New York (ASNY)
- Acupuncturists Without Borders (AWB)
- Advanced Practice Nurses of the Permian Basin (APNPB)
- Advisory Committee on Immunization Practices (ACIP)
- Advisory Committee on Novel Foods and Processes (UK) (ACNFP)
- Advisory Council on Scientific Policy (ACSP)
- Advisory Group for Aerospace Research and Development (AGARD)
- Aero-Medical Equipment Laboratory (AMEL)
- Aerospace Medical Association (AsMA)
- Aerospace Medical Research Laboratory (AMRL)
- Aesthetic Society (AS)
- Age Management Medicine Group (AMMG)
- Agence de Médecine Préventive; Agency of Preventive Medicine (AMP)
- Agency for Health Care Policy and Research (AHCPR)
- Agency for Healthcare Research and Quality (AHRQ)
- Alabama Counseling Association (ALCA)
- Alabama Society for Clinical Social Work (ASCSW)
- Alaska Dental Society (ADS)
- Alaska Psychological Association (AK-PA)
- Alaska State Medical Association (ASMA)
- Alcohol, Drug Abuse, and Mental Health Administration (ADAMHA)
- Alfred Adler Institute for Individual Psychology (AAIIP)
- Alliance for Physician Certification & Advancement (APCA)
- Alliance of International Aromatherapists (AIA)
- Alliance of New Mexico Chiropractors (ANMC)
- All India Occupational Therapists' Association (AIOTA)
- Alpha Kappa Delta International Sociology Honor Society (AKD)
- Alpha Omega Alpha Honor Medical Society (AΩA)
- Alternatives to Violence Project - California (AVP CA)
- Ambulatory Surgery Center Association (ASCA)
- American Academy for Cerebral Palsy and Developmental Medicine (AACPDM)
- American Academy for Health, Physical Education and Recreation (AAHPER)
- American Academy of Addiction Psychiatry (AAAP)
- American Academy of Allergy, Asthma and Immunology (AAAAI)
- American Academy of Anti-Aging Medicine (A4M)
- American Academy of Applied Dental Science (AAADS)
- American Academy of Applied Nutrition (AAAN)
- American Academy of Audiology (AAA)
- American Academy of Cardiovascular Perfusion (AACP)
- American Academy of Child and Adolescent Psychiatry (AACAP)
- American Academy of Childbirth Educators (AACE)
- American Academy of Clear Aligners (AACA)
- American Academy of Clinical Neuropsychology (AACN)
- American Academy of Clinical Toxicology (AACT)
- American Academy of Cosmetic Dentistry (AACD)
- American Academy of Cosmetic Surgery (AACS)
- American Academy of Craniofacial Pain (AACFP)
- American Academy of Dental Group Practice (AADGP)
- American Academy of Dental Sleep Medicine (AADSM)
- American Academy of Dermatology (AAD)
- American Academy of Disaster Medicine (AADM)
- American Academy of Emergency Medicine (AAEM)
- American Academy of Emergency Nurse Practitioners (AAENP)
- American Academy of Environmental Medicine (AAEM)
- American Academy of Esthetic Dentistry (AAED)
- American Academy of Experts in Traumatic Stress (AAETS)
- American Academy of Facial Esthetics (AAFE)
- American Academy of Facial Plastic and Reconstructive Surgery (AAFPRS)
- American Academy of Family Medicine (AAFP)
- American Academy of Family Physicians (AAFP)
- American Academy of Forensic Sciences (AAFS)
- American Academy of General Practice (AAGP)
- American Academy of Hip and Knee Surgeons (AAHKS)
- American Academy of HIV Medicine (AAHIVM)
- American Academy of Hospice and Palliative Medicine (AAHPM)
- American Academy of Husband-Coached Childbirth (AAHCC)
- American Academy of Implant Dentistry (AAID)
- American Academy of Implant Prosthodontics (AAIP)
- American Academy of Medical Acupuncture (AAMA)
- American Academy of Medical Esthetic Practitioners (AAMEP)
- American Academy of Microbiology (AAM)