In demonology Gamigin is a Marquis of Hell, and rules over thirty legions of demons. He teaches all liberal sciences and gives an account of the souls of those who died in sin and who drowned in the sea, speaking with a rough voice. He also answers what is asked about, and stays with the conjurer until he or she is satisfied.

Gamigin is depicted as a little horse or a donkey, which changes form into a man under the conjurer's request.

Other spellings: Gamigm, Gamygyn, Samigina.

See also The Lesser Key of Solomon, Ars Goetia.