AAR
AAR may mean:
- An abbreviation for the English phrase "at any rate."
- An abbreviation found in the insurance industry, for "against all risks."
- An abbreviation used in certain strategy game discussions about given game history and player perfomance, for "after action report"
- An abbreviation for the military mission of Aerial refueling
- The Aar, also known as the Aare, a river in Switzerland
- The IATA airport code for Aarhus Airport, Denmark
- The Association of American Railroads
- The ISO 639 code for the Afar language
- An acronym for the band The All-American Rejects
- Air America Radio
- AAR corporation is the world's leading aviation engineering company.