Our Lady of Darkness (1977) is an urban fantasy novel by American author Fritz Leiber. The novel is distinguished for three elements: the heavily autobiographical elements in the story, the use of Jungian psychology that informs the narrative, and its detailed description of "megapolisomancy", a fictional occult science. It was originally published in shorter form as The Pale Brown Thing.

Fritz Reuter Leiber Jr. was an American writer of fantasy, horror, and science fiction. With writers such as Robert E. Howard and Michael Moorcock, Leiber is one of the fathers of sword and sorcery.