Lemminkäinen or Lemminki is a prominent figure in Finnish mythology. He is one of the heroes of the Kalevala, where his character is a composite of several separate heroes of oral poetry. He is usually depicted as young and good-looking, with wavy red hair.

Finnish mythology commonly refers of the folklore of Finnish paganism, of which a modern revival is practiced by a small percentage of the Finnish people. It has many shared features with Estonian and other Finnic mythologies, but also with neighbouring Baltic, Slavic and, to a lesser extent, Norse mythologies.