Karl von Eckartshausen (; â ) was a German Catholic mystic, writer, and philosopher.
Karl von Eckartshausen was born in Haimhausen, Bavaria. Eckartshausen studied philosophy and Bavarian civil law in Munich and Ingolstadt.
Von Eckartshausen was the author of The Cloud upon the Sanctuary, a work of Christian mysticism which was later taken up by occultists. It was translated into English by Isabelle de Steiger.
He joined the order of the Illuminati founded by Adam Weishaupt, but "withdrew his membership soon after discovering that this order only recognized enlightenment through human reason."
Von Eckartshausen was acquainted with Johann Georg Schröpfer, an early pioneer of phantasmagoria, and himself experimented with the use of magic lanterns to create "ghost projections" in front of an audience of four or five people. He died in Munich at the age of 50.
The Cloud upon the Sanctuary was given a high status in the Hermetic Order of the Golden Dawn, particularly by Arthur Edward Waite. It is known to have attracted English author and the founder of Thelema, Aleister Crowley, to the Order.