Peter Levenda is an author who focuses primarily on occult history. He is best known for his book Unholy Aliance, which is about Esoteric Hitlerism and Nazi occultism.
Levenda is also believed to be "Simon", the author of The Simon Necronomicon, a purported grimoire that derives its title from H.P. Lovecraft's fictional Necronomicon, featured in Lovecraft's Cthulhu Mythos stories. The assessment of Peter Levenda as the author of the Simon Necronomicon is based upon the following sources:
The U.S. Copyright Office registration for Simon's Gates of the Necronomicon lists the author as "Peter Levenda, whose pseudonym is Simon".