- Turing machine
- Turing patterns
- Turing test
- Turing-complete
- Turmeric
- Turn
- Turnbuckles
- Turned
- Turner syndrome
- Turning
- Turning radius
- Turning vanes
- Turnkey
- Turnover number
- Turnstile antenna
- Turpentine
- Turquoise
- Turret punch
- Turtle
- Turtle graphics
- TurtleBot
- Tuyeres
- Twaron
- Tweel
- Tween 20
- TweetDeck
- Twelve
- Twenty-foot equivalent unit
- Twiddle factor
- Twilight
- Twill
- Twin
- Twin bridges
- Twin paradox
- Twin prime
- Twinning
- Twist
- Twisted pair
- Twitching motility
- Two electrons
- Two-dimensional chromatography
- Two-dimensional electron gas
- Two-dimensional flow
- Two-dimensional gas
- Two-dimensional gel electrophoresis
- Two-dimensional liquid
- Two-dimensional materials
- Two-dimensional polymers
- Two-dimensional semiconductors
- Two-electron atom
- Two-element boolean algebra
- Two-factor authentication
- Two-fluid model
- Two-phase flow
- Two-phase locking
- Two-photon absorption
- Two-photon microscopy
- Two-point discrimination
- Two-port network
- Two-sample hypothesis testing
- Two-stroke
- Two-stroke engines
- Two-way communication
- Two-way radios
- Two-wheeler
- Twofish
- Tyloxapol
- Tympanic cavity
- Tympanometry
- Type 2 diabetes
- Type A personality
- Type II collagen
- Type III errors
- Type V collagen
- Type material
- Type metal
- Type specimens
- Type strain
- Type systems
- Type theory
- Type variable
- Type-V collagen
- Type-ii superconductors
- Typedef
- Typhoid fever
- Typographical errors
- Tyramine
- Tyres
- Tyrian Purple
- Tyrosinase
- Tyrosine
- Tyrosine aminotransferase
- Tyrosine kinase
- Tyrosine kinase 2
- Tyrosine kinase inhibitor
- Tyuyamunite
- U waves
- U-87 MG
- U-Net
- U-battery
- U-matrix
- U-shaped valleys
- U3O8
- U937
- UART
- UAV
- UCL
- UCP1
- UCP2
- UCSF Chimera
- UCTD
- UDMH
- UDP
- UDP-glucose pyrophosphorylase
- UDP-glucuronosyltransferase
- UFD
- UGT1A1
- UGT2B7
- UGV
- UHD
- UHV
- UICC
- ULD
- ULF
- ULPA
- ULSD
- UML
- UNIFAC
- UPDRS
- UPFC
- UPGMA
- UPS
- UPnP
- URDF
- URI
- URIs
- URL
- URL shortening
- URN
- URTI
- USB
- USB 3
- USB flash drive
- USB hardware
- USB hub
- USB-C
- USDA soil taxonomy
- USLE
- USRP