In demonology Amaymon is a Prince of Hell, and according to some grimoires, the only one who has power on Asmodai.

A curious use is attributed to this demon, showing how much concerns Asmodai to him, and his importance in the hellish hierarchy; it is that when Asmodai appears under request, the conjurer must stand on his feet and be valiant and respectful, because if he does not, Amaymon will deceive him and doom all his work.

Amaymon is said to have a deadly poisonous breath.

All kings and princes of Hell must hold a silver ring in the middle finger of their left hand against their faces when they are before him as a protection from the flaming breath of the demon when he enrages.

According to Pseudomonarchia Daemonum he is the king of the West, although for some translations of The Lesser Key of Solomon he is king of the East (Although some translations of The Lesser Key of Solomon consider Belial, Beleth, Asmodai and Gaap, not giving detail on the cardinal point they rule).

Other spellings: Amaimon, Amoymon.

See also The Lesser Key of Solomon, Ars Goetia.