STT may refer to:
- Cyril E. King Airport, an airport on St. Thomas in the U.S. Virgin Islands
- Soft tissue therapy, a kind of massage
- Spin torque transfer, a computer hardware technology
- Spinothalamic tract, a sensory pathway originating in the spinal cord
- Stabilimento Tecnico Triestino, a shipbuilding company based in Trieste, Italy
- State Street Corp., a financial services company based in Boston, Massachusetts
- State transition table, a concept in automata theory and sequential logic
- Stewarton railway station
- Speech to Text the process of digitally converting audio into text
- STT Telkom, a telecommunication engineering school
- Singapore Technologies Telemedia, a company owned by Temasek Holdings
- STT Communications, a subsidiary
- A standard Turing test
- Suomen Tietotoimisto, a Finnish news agency
- Spread Tow Tape, a tape made by the Spread Tow technique, first step in making a Spread Tow Fabric.
- Super Talent Technology, a computer memory company
- Syntactic Tree Transformations, in logic: an algorithm used to reduce signed propositional formulas.
- Securities Transaction Tax - a tax paid on all buying/selling of securities in the capital markets.
- Student Talk Time, A term used to in TEFL methodology to define the amount of time the student speaks during an English language lesson.