- Then and then itself
- Thence
- Thereat
- Therefore
- Therein
- Thereof
- Thereto
- Thereupon
- Therewith
- Therm
- Thermo current
- Thermocol
- Thimble
- Thin air
- Thin on the ground
- Thin thing
- Thine
- Things
- Think back to
- Think for oneself
- Think over
- Think up
- Thinking
- Thinned
- Thio
- Third degree
- Third man
- Third party
- Third world
- Thirstily
- Thirty
- Thiruvanchikulam
- Thoughtfulness
- Thousandth
- Thraldom
- Thrash
- Thread
- Thread-worm
- Threadfin bream
- Threat
- Three
- Three kinds
- Three months
- Throne
- Through and through
- Throughout
- Throw
- Throw away
- Throw down the glove
- Throw light on
- Throw mud at
- Throw-off
- Tibetan
- Tibia
- Tic
- Ticcit
- Tick
- Tick-tock
- Ticker-tape
- Ticket counter
- Tickler
- Tidbit
- Tide
- Tide-mark
- Tideway
- Tidily
- Tidy up
- Tie for
- Tie-beam
- Tie-breaker
- Tilt at
- Tilth
- Timbre
- Timbuktu
- Time
- Time and again
- Time and tide waits for no man
- Time factor
- Time killing
- Time measuring
- Time travel
- Time-exposure
- Time-worn
- Timebound
- Timescale
- Timetable
- Timing
- Timorous
- Tiredly
- Tiredness
- Tireless
- Tiresomeness
- Tiring
- Tissue culture
- Titanium
- Tithe barn
- Title
- Title-holder
- Titrate
- Tits