RTN may refer to:

  • Random telegraph noise
  • Raytheon Company (stock symbol)
  • Recursive transition network
  • Register transfer notation, a type of specification language for synchronous digital circuits
  • Reticular thalamic nucleus
  • Retro Television Network, a television network in United States
  • Return key
  • Rotarian
  • Routing transit number, a code used by the banking system in United States
  • Royal Thai Navy
  • RTN, the former callsign of the NRN TV station in Lismore, New South Wales, Australia
  • Racetrack Television Network, a North American horse and greyhound racing network
  • RTN (Switzerland), radio broadcaster