- Then and there
- Thenceforth
- There is room for improvement
- There you are
- Therefor
- Therefrom
- Thermal
- Thermal equator
- Thimble-rig
- Thin skinned
- Thing
- Think again
- Think big
- Think fit
- Think little
- Think well of
- Thinker
- Thiswise
- Thither
- Thiyyas
- Tholas
- Thong
- Thorium
- Thoroughfare
- Thoroughness
- Those
- Thou
- Though
- Thoughtful
- Three times five
- Three-quarter
- Threefold
- Threesome
- Threnody
- Thriller
- Thrips
- Throat-pain
- Throbbing
- Throe
- Thrust
- Thruster
- Thud
- Thug life
- Thumb-mark
- Thumburu
- Thunder
- Thunderous
- Thursday
- Thwart
- Thymol seeds
- Thyroid
- Thyroxin
- Tied to one's mother's apron strings
- Tied-house
- Tiff
- Tiger by the tail
- Tiger skin
- Tight corner of spot
- Tight-lipped
- Tight-rope
- Tighten
- Tigon
- Tigress
- Til oil
- Tile
- Tile-stone
- Till
- Time-fuze
- Time-switch
- Timely
- Times
- Timesheet
- Timetested
- Timidity
- Timidly
- Timpani
- Tin man
- Tinctorial
- Tire
- Tirelessly
- Tiresome
- Titchy
- Tithe
- Title bar
- Title-role
- Titled
- Titmouse
- Titration
- To be asthmatic
- To be bewildered
- To be coagulated
- To be covered
- To be crambed
- To be delivered
- To be peeled off
- To be petrified
- To be pleased
- To be rolled
- To be rubbed off
- To be satiated