TNN may refer to:

  • One of the former names of the U.S. TV channel Spike:
    • The Nashville Network
    • The National Network
    • TNN Motor Sports/TNN Sports, aired motorsports events from 1983–2003
  • Times News Network, Indian news agency
  • TNN, airport code of Tainan Airport
  • TNN Bass Tournament of Champions, Super Nintendo Entertainment System and Mega Drive/Genesis fishing game
  • TNN Motorsports Hardcore Heat, racing video game for the Dreamcast system
  • The Nethernet, multiplayer game overlain on Firefox
  • True News Network, channel of Thailand's cable satellite television operator, TrueVisions
  • "Total No Noise" series of products by Zalman
  • One of the abbreviations for the protein Tenascin