In demonology Andrealphus is a Great Marquis of Hell, who has under his rule thirty legions of demons. He teaches Astronomy, all mathematical sciences, and Geometry. He makes men very subtle and cunning, and good disputers. Andrealphus can also transform a man into the likeness of a bird.

He is depicted as a peacock that makes great noises, but after a while changing his shape into a man.

Other spelling: Androalphus.

See also The Lesser Key of Solomon, Ars Goetia.