TTY may refer to:
Communications and technology
- Teleprinter or teletypewriter, an electromechanical typewriter paired with a communication channel
- Sometimes used more generally for any type of computer terminal
- May also be used to refer to a virtual console in Unix-like operating systems
- Another name for a telecommunications device for the deaf (TDD), a teleprinter designed for persons with hearing or speech difficulties
- tty (Unix), a command found in Unix-like operating systems
Other uses
- Tampere University of Technology (Tampereen Teknillinen Yliopisto), in Finland
- Torque-to-yield fastener