Weird West is a term used for the hybrid genres of fantasy Western, horror Western and science fiction Western. The term originated with DC's Weird Western Tales in 1972, but the idea is older as the genres have been blended since the 1930s, possibly earlier, in B-movie Westerns, comic books, movie serials and pulp magazines. Individually, the hybrid genres combine elements of the Western genre with those of fantasy, horror and science fiction respectively.

A science fiction Western is a subgenre or cross-genre that uses traditional Western plots and settings, while incorporating science fiction elements such as futuristic technology or aliens. The post-apocalyptic Western and steampunk Western fall within this subgenre.