TTY may refer to:

• Teleprinter or teletypewriter (TTY), 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

• Tampere University of Technology (Tampereen Teknillinen Yliopisto), in Finland
• Torque-to-yield fastener