- Titanium dioxide
- Titanium isopropoxide
- Titanium oxide
- Titanium powder
- Titanium sublimation pump
- Titanium tetrachloride
- Titanocene dichloride
- Titration
- Tobacco
- Tobacco smoke
- Tocopherol
- Toluene
- Tonalite
- Tongs
- Tonicity
- Tonne of oil equivalent
- Tool steel
- Tooth
- Tooth decay
- Tooth enamel
- Topaz
- Topography
- Topsoil
- Torque
- Torque tester
- Torr
- Torsion
- Torsion constant
- Torsion spring
- Torsional vibration
- Torus
- Total cost of ownership
- Total inorganic carbon
- Touchscreens
- Toughness
- Tourmaline
- Tournaisian
- Tower
- Tower blocks
- Toxic epidermal necrolysis
- Toxic waste
- Toxicity
- Toxins
- Trabeculectomy
- Trace
- Trace elements
- Trace gases
- Traction
- Trade-offs
- Traffic barrier
- Traffic calming
- Traffic engineering
- Traffic flow
- Tragedy of the commons
- Trailer
- Trailing edge
- Trails
- Train
- Train station
- Trainer aircraft
- Trajectory
- Trams
- Transceivers
- Transcription
- Transcription factors
- Transfer molding
- Transferrin
- Transfersomes
- Transform faults
- Transformation matrix
- Transformer oil
- Transformers
- Transgranular fracture
- Transistor
- Transition metals
- Transition zone
- Translation
- Transmission towers
- Transmittance
- Transmitters
- Transonic
- Transparency
- Transparent ceramics
- Transpiration
- Transport phenomena
- Transportation engineering
- Transpose
- Transuranic waste
- Transuranium elements
- Transverse plane
- Transverse waves
- Trapezoid
- Trass
- Traveling wave reactor
- Travertine
- Treadmills
- Tremie
- Trial and error
- Triangular prism
- Triangulation
- Triaxial shear test
- Triazine
- Tribology
- Tribometers
- Tributyl phosphate
- Tributyltin
- Tributyltin oxide
- Tricalcium aluminate
- Tricalcium phosphate
- Trichlorosilane
- Triclinic crystal system
- Tridymite
- Triethylamine
- Triethylborane
- Trifluoroacetic acid
- Triglycerides
- Trimethylamine
- Trimethylgallium
- Trimethylolpropane triglycidyl ether
- Trimmer
- Triodes
- Trip hammers
- Triphenylphosphine
- Triple bonds
- Triple point
- Triplet oxygen
- Triplet state
- Tritiated water
- Tritium
- Trituration
- Troilite
- Trona
- Tropical cyclones
- Troubleshooting
- Troughs
- Trusses
- Trypsin
- Tsunamis
- Tube
- Tube bending
- Tuff
- Tufting
- Tuned mass dampers
- Tungsten
- Tunica intima
- Tunnel magnetoresistance
- Tunnels
- Turbidite
- Turbidity currents
- Turbines