- Transpose
- Transposition
- Transposition of the great vessels
- Transposon mutagenesis
- Transposons
- Transpression
- Transrapid
- Transrectal ultrasound
- Transshipment
- Transshipment problem
- Transsphenoidal surgery
- Transtension
- Transtheoretical model
- Transthoracic echocardiogram
- Transthyretin
- Transudate
- Transuranic
- Transuranic waste
- Transuranium elements
- Transurethral resection of the prostate
- Transversal
- Transversalis fascia
- Transversality condition
- Transverse
- Transverse colon
- Transverse engine
- Transverse isotropy
- Transverse mode
- Transverse plane
- Transverse sinus
- Transverse waves
- Transversus abdominis
- Trap rock
- Trapdoor function
- Trapezius
- Trapezoid
- Trapezoidal distribution
- Trapezoidal rule
- Trapped ions
- Trash
- Trash rack
- Trass
- Trastuzumab emtansine
- Trauma
- Trauma center
- Trauma team
- Traumatology
- Traveler's diarrhea
- Traveling microscope
- Traveling wave antenna
- Traveling wave reactor
- Traveling-wave antenna
- Travelling microscope
- Travelling salesman problem
- Traversal using relays around NAT
- Traverse
- Travertine
- Tread
- Treadle
- Treadmill desk
- Treadmills
- Treatment planning
- Treatment-resistant depression
- Tree
- Tree decomposition
- Tree kernel
- Tree traversal
- Tree-depth
- Treebanks
- Treemaps
- Treewidth
- Trefftz method
- Trefoil
- Trehalase
- Trehalose
- Trellis
- Tremie
- Tremolite
- Trench
- Trench foot
- Trend
- Trend analysis
- Trend line
- Trend-stationarity
- Trepanning
- Trephine
- Treponema pallidum
- Trevorite
- Triac
- Triacetin
- Triage
- Trial and error
- Trial pit
- Triangle graph
- Triangle inequality
- Triangle mesh
- Triangle strip
- Triangle waves
- Triangular distribution
- Triangular matrix
- Triangular prism
- Triangulation
- Triatomic molecules
- Triaxial shear test
- Triazene
- Triazine
- Triazole
- Tribocorrosion
- Triboelectric effect
- Tribofilm
- Tribology
- Triboluminescence
- Tribometers
- Tribosystem
- Tribromoacetic acid
- Tributary
- Tributyl phosphate
- Tributylamine
- Tributyltin
- Tributyltin oxide
- Tributyrin
- Tricalcium aluminate
- Tricalcium phosphate
- Tricarboxylic acid
- Triceps
- Trichinella
- Trichlorfon
- Trichloroacetic acid
- Trichlorobenzene
- Trichloroethylene
- Trichlorofluoromethane
- Trichlorophenol
- Trichlorosilane
- Trichostatin A
- Trichothecenes
- Trichromacy
- Trichromatic
- Trichrome stain
- Trichrome staining
- Tricine
- Trickle-bed reactor
- Trickling filters
- Triclinic
- Triclinic crystal system
- Triclocarban
- Triclopyr
- Triclosan
- Tricresyl phosphate
- Tricubic interpolation
- Tricuspid regurgitation