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