ATR may refer to:

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

In phonetics, advanced tongue root and retracted tongue root, abbreviated ATR or RTR, are contrasting states of the root of the tongue during the pronunciation of vowels in some languages, especially in West and East Africa but also in Kazakh and Mongolian. It used to be suggested that it was the basis for the distinction between tense and lax vowels in European languages such as German, but it is no longer seems tenable.