In demonology Malthus is an Earl of Hell, commanding 26 legions of demons, who is said to have a rough voice when speaking.

Malthus builds towers and fills them with ammunition and weapons, and sends warriors to the place he is requested to.

He is depicted in the shape of a stork.

Other spellings: Halphas, Malthas, Malthous.

See also The Lesser Key of Solomon, Ars Goetia.