- Vorticity
- Vorticity confinement
- Vorticity equation
- Vostok
- Voting
- Voussoirs
- Voxel
- Vroman effect
- Vugs
- Vulcanization
- Vulnerability assessment
- Vulnerability databases
- Vulnerability scanner
- Vulnerable plaque
- Vycor
- WAF
- WAIS
- WAN
- WASH-1400
- WAT
- WAV
- WBGT
- WBS
- WCAG
- WCET
- WCF
- WDM
- WEP
- WEPP
- WFI
- WFQ
- WGS84
- WI-38
- WIMP
- WKB approximation
- WLAN
- WLCSP
- WLTP
- WMA
- WML
- WMS
- WMV
- WOMAC
- WORM
- WOT
- WPA
- WPC
- WPF
- WPKI
- WS-Addressing
- WS-Policy
- WSDL
- WSGI
- WSMO
- WUE
- WWAN
- WYSIWYG
- Waardenburg syndrome
- Wackestone
- Wafer
- Wafer bonding
- Wafer dicing
- Wafer fabrication
- Wafer testing
- Wafer-level packaging
- Waffle slab
- Wagons
- Waist
- Wait
- Wake
- Wake turbulence
- Wake-on-LAN
- Wald test
- Walk-around
- Walkability
- Walker
- Walkway
- Wall
- Wall footing
- Wall-plug efficiency
- Wallace tree
- Walled gardens
- Wallerian degeneration
- Wallpaper groups
- Walnut
- Walsh diagrams
- Walsh functions
- Wankel engine
- WannaCry ransomware attack
- Wannier functions
- War on cancer
- Warburg effect
- Ward's method
- Warehousing
- Warm core rings
- Warm dense matter
- Warp
- Warp knitting
- Warping
- Warren trusses
- Warts
- Wash load
- Washburn's equation
- Washer
- Washing machine
- Wason selection task
- Waspaloy
- Wasserstein GAN
- Waste
- Waste characterisation
- Waste collection
- Waste collector
- Waste compaction
- Waste heat
- Waste heat recovery
- Waste heat recovery unit
- Waste hierarchy
- Waste management
- Waste minimisation
- Waste oil
- Waste pickers
- Waste products
- Waste reduction
- Waste sorting
- Waste stabilization ponds
- Waste tires
- Waste treatment
- Waste treatment technologies
- Waste valorization
- Waste-to-energy
- Waste-to-energy plants
- Wastegate
- Wastewater treatment
- Wastewater-based epidemiology
- Wasting
- Watch
- Watch glass
- Watchdog timer
- Watchful waiting
- Watchkeeping
- Water abstraction
- Water activity
- Water balance
- Water bath
- Water bottles
- Water brake
- Water chemistry
- Water chiller
- Water chlorination
- Water clarity