In demonology Amdukias is a demon that has thirty legions of demons under his command (29 to other authors). He has the rank of Great Duke. Amdukias is associated with the thunder, being said that his voice is heard during storms. In other cites, all types of musical instruments can be heard but not seen when he appears. He can make trees bend at the conjurer's will.

He is depicted as a human with claws instead of hands and feet, the head of a unicorn, and a trumpet to symbolise his powerful voice. According to other sources, this demon is depicted as a unicorn, and changes into a man under the request of the conjurer.

Other spellings: Ambduscias, Amduscias, Amdusias.

See also The Lesser Key of Solomon, Ars Goetia.