- Viscosity index
- Viscous liquids
- Vise
- Visible spectrum
- Visual artifacts
- Visual perception
- Vitamins
- Vitrification
- Voice coil
- Voice over IP
- Void
- Void coefficient
- Void ratio
- Volatile
- Volatilisation
- Volatility
- Volcanic
- Volcanic ash
- Volcanic glass
- Volcanic rock
- Volta potential
- Voltaic piles
- Volume element
- Volume fraction
- Volume rendering
- Volumetric display
- Volumetric flow rate
- Volumetric heat capacity
- Volute
- Vomiting
- Vortex
- Vortex generators
- Vugs
- Vulcanization
- Vulnerable plaque
- WFI
- WIMP
- Wafer
- Waffle slab
- Wankel engine
- Warren trusses
- Washer
- Washing machine
- Waspaloy
- Waste characterisation
- Waste heat
- Waste heat recovery unit
- Waste management
- Waste oil
- Waste-to-energy
- Wastewater treatment
- Watch
- Water chlorination
- Water conservation
- Water content
- Water cooling
- Water cycle
- Water filters
- Water fluoridation
- Water footprint
- Water gas
- Water hammer
- Water heating
- Water industry
- Water landing
- Water level
- Water model
- Water of crystallization
- Water pollution
- Water potential
- Water purification
- Water quality
- Water resources
- Water scarcity
- Water security
- Water softening
- Water splitting
- Water supply
- Water supply network
- Water table
- Water tanks
- Water towers
- Water treatment
- Water turbines
- Water vapor
- Water wheels
- Water-cement ratio
- Water-gas shift reaction
- Water-use efficiency
- Waterfalls
- Waterproofing
- Waterways
- Wattle and daub
- Wattmeter
- Wave base
- Wave function
- Wave interference
- Wave soldering
- Wave-particle duality
- Waveguides
- Wavelength
- Wavenumber
- Wax
- Weak base
- Wear
- Weather balloons
- Weather forecasting
- Weathering
- Weathering steel
- Weber number
- Wedges
- Weep
- Weibull distribution
- Weighted arithmetic mean
- Weir
- Weldability
- Welding
- Welding helmet
- Welding joints
- Well logging
- Wet-bulb temperature
- Wetlands
- Wetsuit
- Wetting
- Wetting transition
- Wharf
- Wheelbase
- Wheels
- Whisker
- White Portland cement
- White blood cells
- White matter
- White metal
- White noise
- Wholesaling
- Wi-Fi
- Wi-Fi 6
- Wi-Fi hotspot
- Wide-angle x-ray scattering
- Wide-bandgap semiconductors
- Wiedemann-Franz law
- Wilhelmy plate
- Wind engineering
- Wind farms
- Wind power
- Wind tunnel
- Windage
- Wing fences
- Wingsail
- Wingtip vortices