Hastur Lord is a science fantasy novel by American writers Deborah J. Ross and Marion Zimmer Bradley in the Darkover series. It was first published by in hardcover by DAW Books in 1996. The book falls in the part of the Darkover timeline that the author called "Against the Terrans: The Second Age (after the Comyn)". Hastur Lord is an allegory, illustrating the consequences to a religiously pluralistic planet, when a small group of monotheistic fundamentalists tries to impose their will on a larger society that doesn't share their views.