China 
Africa 
- Theoretical plates
- Theory of mind
- Theory of planned behavior
- Theory of reasoned action
- TheraSphere
- Theranostics
- Therapeutic Use Exemption
- Therapeutic alliance
- Therapeutic angiogenesis
- Therapeutic assessment
- Therapeutic cloning
- Therapeutic community
- Therapeutic drug monitoring
- Therapeutic effect
- Therapeutic endoscopy
- Therapeutic food
- Therapeutic gardens
- Therapeutic hypothermia
- Therapeutic inertia
- Therapeutic misconception
- Therapeutic nihilism
- Therapeutic plasma exchange
- Therapeutic relationship
- Therapeutic touch
- Therapeutic ultrasound
- Therapeutic use
- Therapeutic vaccines
- Therapeutic window
- Therapeutics
- Therapist
- Thermal burns
- Thermal cycler
- Thermal cycling
- Thermal energy
- Thermal imaging
- Thermal imaging cameras
- Thermal shift assay
- Thermal stability
- Thermodynamic system
- Thermodynamics
- Thermogenesis
- Thermogenin
- Thermography
- Thermogravimetric analysis
- Thermolysin
- Thermoplastic elastomers
- Thermoplastics
- Thermoreceptors
- Thermoregulation
- Thermostability
- Thermotaxis
- Thermotherapy
- Thermotoga
- Thermotoga maritima
- Thermotropism
- Thermus
- Thermus aquaticus
- Theta rhythm
- Thetan
- Thiacloprid
- Thiadiazoles
- Thiamazole
- Thiamethoxam
- Thiamine
- Thiamine deficiency
- Thiamine monophosphate
- Thiamine pyrophosphatase
- Thiamine pyrophosphate
- Thiamine transporter
- Thiamine triphosphate
- Thiamylal
- Thiazide
- Thiazide-like diuretic
- Thiazole
- Thiazolidine
- Thick ascending limb
- Thick filament
- Thickened fluids
- Thielavia
- Thienamycin
- Thienopyridine
- Thiethylperazine
- Thigh
- Thigmotaxis
- Thimet oligopeptidase
- Thin basement membrane disease
- Thin filament
- Thin ideal
- Thin layer chromatography
- Thioacetal
- Thioacetamide
- Thioamide
- Thioanisole
- Thiobacillus
- Thiobarbituric acid
- Thiocarbamate
- Thiocarbohydrazide
- Thiocolchicoside
- Thiocyanate
- Thiodiglycol
- Thioesterase
- Thioesters
- Thioethers
- Thioflavin
- Thioglycolate broth
- Thioinosinic acid
- Thioketal
- Thiol group
- Thiolase
- Thiolates
- Thiols
- Thiolysis
- Thiomer
- Thiomersal
- Thionamide
- Thionein
- Thionine
- Thionyl chloride
- Thiopental
- Thioperamide
- Thiophene
- Thiophosphate
- Thioproline
- Thiopurine
- Thiopurine methyltransferase
- Thioredoxin
- Thioridazine
- Thiosemicarbazide
- Thiosemicarbazone
- Thiotepa
- Thiothixene
- Thiourea
- Thioureas
- Third degree atrioventricular block
- Third heart sound
- Third metacarpal
- Third metacarpal bone
- Third metatarsal bone
- Third molars
- Third occipital nerve
- Third ventricle
- Third-generation sequencing
- Third-party reproduction
- Thirst
- Thistle
- Thiyl radicals
- Thomas test
- Thompson test
- Thomsen disease
- Thomsen-Friedenreich antigen