ATR

ATR may refer to:

Aviation

• ATR (aircraft manufacturer) an Italian-French aircraft manufacturer
  • ATR 42 airliner
  • ATR 72 airliner

Music

• All That Remains (band), an American heavy metal band
• Atari Teenage Riot, a German techno band performing "digital hardcore" music
  • ATR (song), a song by ATR

Science and technology

• Advanced Test Reactor, nuclear research reactor at the Idaho National Laboratory, US
• Air Transport Rack, standards for plug-in electronic modules in aviation and elsewhere; various suppliers eg. ARINC
• Answer to reset, a message output by a contact Smart Card
• Ataxia telangiectasia and Rad3 related, a protein involved in DNA damage repair
• Attenuated total reflectance in infrared spectroscopy
• Automatic target recognition, recognition ability
• Autothermal reforming, a natural gas reforming technology
• Advanced tongue root, a phonological feature in linguistics

Other uses

• Absent Teacher Reserve, of teachers in New York City, US
• Americans for Tax Reform, US
• Registered art therapist
• Atmore (Amtrak station), Amtrak station code ATR
• ATR: All Terrain Racing, a video game
• ATR.1 certificate, in trade between EU and Turkey
• ATR (company) (Auto-Teile-Ring), Germany
• Average True Range, a market volatility indicator
• ATR (TV channel), a Crimean Tatar TV Channel
• African Traditional Religion