Kun may refer to:
- Kun (鯤) and Peng, two forms of a creature from Chinese mythology
- Kun is the name of the moon-god in Finnish mythology
- Kunqu or Kun Opera, a Chinese opera genre
- kun (君), a Japanese honorific
- the kun'yomi (音) reading of Kanji
- one of a pair of mountain peaks in the Nun Kun massif in Kashmir, India
- nickname of Argentine footballer Sergio Agüero
- The Arabic verb (كن) "to be" in imperative form, supposedly the Word Allah uttered to create the universe.
- a named place in the Papua region of Indonesia
- the IATA airport code for Kaunas Airport in Kaunas, Lithuania
- Béla Kun, a Hungarian communist politician.
- In Star Wars Kun is the Emperor's grandson/Triclops son.
- Used in Bamboo clothing (bamboo viscose) "It is anti-bacterial with a unique anti-bacterial agent named kun".