- Tempered glass
- Tempering
- Tennis elbow
- Tensile testing
- Tensiometers
- Tensioner
- Tensor fields
- Tensors
- Terahertz radiation
- Teratology
- Terephthalic acid
- Terminal ballistics
- Terphenyl
- Terracotta
- Tessellation
- Test methods
- Test tube
- Tetrachloroethylene
- Tetracyanoquinodimethane
- Tetrad
- Tetraethyl orthosilicate
- Tetraethylammonium
- Tetrafluoroethylene
- Tetragonal crystal system
- Tetrahedron
- Tetrahydrofuran
- Tetramers
- Tetramethylammonium hydroxide
- Tetramethylethylenediamine
- Tetramethyllead
- Tetrasodium pyrophosphate
- Texels
- Textile
- Textile recycling
- Texture
- Texture mapping
- Thallium
- Thallium iodide
- Thaumasite
- Theoretical plates
- Thermal adhesive
- Thermal battery
- Thermal bridges
- Thermal comfort
- Thermal conduction
- Thermal contact conductance
- Thermal decomposition
- Thermal desorption spectroscopy
- Thermal diffusivity
- Thermal diodes
- Thermal efficiency
- Thermal effusivity
- Thermal emittance
- Thermal energy
- Thermal energy storage
- Thermal engineering
- Thermal equilibrium
- Thermal expansion
- Thermal insulation
- Thermal management
- Thermal mass
- Thermal oxidation
- Thermal paste
- Thermal pollution
- Thermal radiation
- Thermal reservoir
- Thermal runaway
- Thermal shock
- Thermal spraying
- Thermal stress
- Thermal transmittance
- Thermistors
- Thermite
- Thermochemistry
- Thermocouples
- Thermodynamic activity
- Thermodynamic equilibrium
- Thermodynamic system
- Thermodynamic temperature
- Thermodynamics
- Thermoeconomics
- Thermoelectric cooling
- Thermoelectric effect
- Thermoforming
- Thermogravimetric analysis
- Thermoluminescence
- Thermoluminescent dosimeter
- Thermomechanical processing
- Thermometers
- Thermonatrite
- Thermoplastic elastomer
- Thermoplastic olefin
- Thermoplastics
- Thermoregulation
- Thermoset polymer matrix
- Thermosetting polymer
- Thermosiphon
- Thermostat
- Thiazide
- Thickening agents
- Thin sections
- Thin-film bulk acoustic resonator
- Thin-film interference
- Thiocyanate
- Thiols
- Thiomargarita namibiensis
- Thionyl chloride
- Thiosulfate
- Third rail
- Thixotropy
- Thorium
- Thorium dioxide
- Thorium fuel cycle
- Thorium-232
- Thorium-based nuclear power
- Thousandths of an inch
- Three-dimensional space
- Three-phase electric power
- Thrombosis
- Thromboxane A2
- Thrombus
- Thrust
- Thumb
- Thunderbolt
- Thymol
- Thymol blue
- Thymolphthalein
- Tidal barrages
- Tidal force
- Tidal power
- Tide
- Tight junctions
- Tight oil
- Tilt-up
- Tiltrotor
- Time dilation
- Time standard
- Tin
- Tin chloride
- Tin oxide
- Tinning
- Tinplate
- Tire balance
- Tires
- Tissue
- Tissue engineering
- Titanate
- Titanite
- Titanium
- Titanium alloys