Medical Organizations
- United States Marine Corps (USMC)
- United States Marine Hospital (USMH)
- United States Navy (USN)
- United States Professional Association for Transgender Health (USPATH)
- United States Veterans Bureau (USVB)
- United States Veterans Hospital (USVH)
- Upper Cervical Research Foundation (UCRF)
- Urgent Care Association (UCA)
- Urology Center of Westchester (UCW)
- Utah Dental Association (UDA)
- Utah Medical Association (UMA)
- Utah Nurse Practitioners (UNP)
- Utah Osteopathic Medical Association (UOMA)
- Vascular & Endovascular Surgery Society (VESS)
- Vascular Surgical Society of Great Britain and Ireland (VSSGBI)
- Vattikuti Urology Institute (VUI)
- Vestibular Disorder Association (VeDA)
- Veterans Administration Cooperative Research Group (VACURG)
- Veterans Administration Hospital (VAH)
- Veterans Administration Lung Cancer Study Group (VALG)
- Veterans Administration Medical Center (VAMC)
- Veterinary Corps (VC)
- Victorian Order of Nurses (Canada) (VON)
- Virginia Council of Nurse Practitioners (VCNP)
- Virginia Counselors Association (VCA)
- Virginia Dental Association (VDA)
- Virginia Midwives Alliance (VMA)
- Virginia Society of Anesthesiologists (VSA)
- Visiting Nurse Association (VNA)
- Visiting Nurse Association of America (VNAA)
- Washington Acupuncture & Eastern Medicine Association (WAEMA)
- Washington Association of Naturopathic Physicians (WANP)
- Washington State Podiatric Medical Association (WSPMA)
- Weight Management Dietetic Practice Group (WMDPG)
- West African College of Surgeons (WACS)
- Westchester County Medical Society (WCMS)
- Westchester Rockland Dietetic Association (WRDA)
- Western Association of Physicians (WAP)
- Western Section of the American Urological Association (WSAUA)
- Western Thoracic Surgical Association (WTSA)
- Western Vascular Society (WVS)
- West Michigan Optometric Association (WMOA)
- Weston A. Price Foundation (WAPF)
- Wichita County Medical Society (WCMS)
- Wilderness Medical Society (WMS)
- Wisconsin Association for Marriage and Family Therapy (WAMFT)
- Wisconsin Chiropractic Association (WCA)
- Wisconsin Counseling Association (WCA)
- Wisconsin Dermatology Society (WDS)
- Wisconsin Medical Society (WMS)
- Wisconsin Society of Orthotists, Prosthetists and Pedorthists (WSOPP)
- Wisconsin Surgical Society (WSS)
- Women's Army Corps (WAC)
- Women's Dermatologic Society (WDS)
- Women's Medical Association of New York City (WMANYC)
- Workers’ Compensation Institute (WCI)
- World Academy of Pain Medicine United (WAPMU)
- World Allergy Organization (WAO)
- World Association for Disaster and Emergency Medicine (WADEM)
- World Association of (Anatomic and Clinical) Pathology Societies (WAPS)
- World Association of Societies of Pathology and Clinical Pathology (WASP)
- World Confederation for Physical Therapy (WCPT)
- World Council of Enterostomal Therapists (WCET)
- World Doctors Orchestra (WDO)
- World Federation for Mental Health (WFMH)
- World Federation for the Protection of Animals (WFPA)
- World Federation for Ultrasound in Medicine and Biology (WFUMB)
- World Federation of Anesthesiological Societies (WFAS)
- World Federation of Hemophilia (WFH)
- World Federation of Neurology (WFN)
- World Federation of Neurosurgical Societies (WFNS)
- World Federation of Occupational Therapists (WFOT)
- World Federation of Orthodontists (WFO)
- World Federation of Parasitologists (WFP)
- World Federation of Public Health Associations (WFPHA)
- World Federation of Scientific Workers (WFSW)
- World Federation of Societies of Anesthesiology (WFSA)
- World Federation of the Deaf (WFD)
- World Health Assembly (WHA)
- World Health Organization (WHO)
- World Health Research Center (WHRC)
- World Institute of Pain (WIP)
- World Medical Association (WMA)
- World Medical Periodicals (WMP)
- World Medical Relief (WMR)
- World Organization of National Colleges, Academies, and Academic Associations of General Practitioners (WONCA)
- World Professional Association for Transgender Health (WPATH)
- World Psychiatric Association (WPA)
- World Sterilization Congress (WSC)
- Wound Care Learning Network (WCLN)
- Wound Healing Society (WHS)
- Wyoming Medical Society (WMS)
- Yoga Alliance (YA)
- Zero to Three (ZTT)