Lovecraft’s horror stories have become not just a literary cult like many others, but a tangible cult of the occult. The Cthulhu Mythos of the Old Gods with Unspeakable names are evoked and worshipped, and respected practitioners of the esoteric use the symbolism and mythos as the basis of a magical system. This essay examines some of the individuals, orders and doctrines of the adherents of the Cthulhu Mythos.
An excellent article by K R Bolton: The Influence of H P Lovecraft on Occultism. From The Irish Journal of Gothic and Horror Studies.