In demonology Zepar is a Great Duke of Hell, who tries to seduce women, and if requested by them, he can change his shape into that of their beloved man, but makes them sterile. He has twenty-six legions of demons under his command. Other grimoires say that he makes women love men and brings them together in love. According to other authors, Zepar tries to seduce men by means of pederasty.

He is depicted as a soldier with red clothes and armour.

See also The Lesser Key of Solomon, Ars Goetia