AUN or Aun may refer to:

Aun, a mythical Swedish king Aun (surname), an Estonian-language surname ASEAN University Network, an Asian university association A-un, the Japanese transliteration of the word "om" Aunn Komano, a fictional character in Hidden Star in Four Seasons from the video game series Touhou Project

Transportation Auburn Municipal Airport (California) (FAA LID code: AUN), a public airport in California Common Sky (ICAO code: AUN), a former Austrian aviation company

See also Avun, a village in Azerbaijan