China 
Africa 
- Voodoo death
- Vorapaxar
- Voretigene neparvovec
- Voriconazole
- Vorinostat
- Vorozole
- Vortex mixer
- Vortioxetine
- Vowel reduction
- Voxel based morphometry
- Voxilaprevir
- Vpr
- Vpspr
- Vpx
- Vroman effect
- Vulgaxanthin
- Vulnerable plaque
- Vulva
- Vulval cancer
- Vulval vestibule
- Vulvar cancer
- Vulvar intraepithelial neoplasia
- Vulvar vestibulitis
- Vulvectomy
- Vulvitis
- Vulvodynia
- Vulvoplasty
- Vulvovaginitis
- W-18
- WADA test
- WAGR syndrome
- WAIS
- WASH
- WAY-100135
- WAY-100635
- WFDC2
- WHIM syndrome
- WHO Model List of Essential Medicines
- WHO Surgical Safety Checklist
- WI-38
- WNK1
- WOMAC
- WRKY transcription factors
- WW domain
- Waardenburg syndrome
- Wada test
- Waddell's signs
- Wagner's disease
- Waist
- Waist circumference
- Waist hip ratio
- Waist to height ratio
- Wait list control group
- Waiting in healthcare
- Wake therapy
- Wakefulness
- Waldenstrom macroglobulinemia
- Waldeyer's tonsillar ring
- Walker
- Walker-Warburg syndrome
- Walking boot
- Wallace rule of nines
- Wallenberg syndrome
- Wallerian degeneration
- Walnut oil
- Walnuts
- Wandering
- Wandering atrial pacemaker
- Wandering cells
- Wandering spleen
- Wandering womb
- War on Cancer
- Warburg Micro syndrome
- Warburg effect
- Warburg hypothesis
- Warfarin
- Warfarin resistance
- Warm autoimmune hemolytic anemia
- Warm compress
- Warm compresses
- Warm-blooded
- Warming up
- Warning signs of suicide
- Warsaw breakage syndrome
- Wartenberg's sign
- Warthin's tumor
- Warthin-Starry stain
- Warts
- Wasabi
- Washed red blood cells
- Washing
- Wassel classification
- Wassermann test
- Waste incinerator
- Waste management
- Waste to energy
- Waste water
- Wastewater
- Wastewater treatment
- Wastewater-based epidemiology
- Wasting
- Wasting syndrome
- Watchful waiting
- Water absorption
- Water aerobics
- Water birth
- Water caltrop
- Water clusters
- Water deprivation
- Water gas
- Water intoxication
- Water lily sign
- Water maze
- Water memory
- Water molecules
- Water pollution
- Water purification
- Water resources
- Water retention
- Water scarcity
- Water shortages
- Water soluble vitamins
- Water treatment
- Water treatment plant
- Water window
- Water's view
- Waterborne diseases
- Watercress
- Waterhouse-Friderichsen syndrome
- Waters view
- Watson-Schwartz test
- Wave
- Wavelength
- Wax esters
- Waxes
- Waxing
- Waxy corn
- Waxy flexibility
- Weakness
- Weaning
- Weaver syndrome
- Weaver-Dunn procedure
- Web Accessibility Initiative
- Webbed neck
- Weber test
- Weber's syndrome
- Weber-Christian disease
- Weber-Fechner law
- Wechsler Intelligence Scale
- Wechsler Intelligence Scale for Children