Space Western is a subgenre of science fiction that transposes themes of American Western books and film to a backdrop of futuristic space frontiers.

One notable hybrid of Westerns and science fiction is the television series Firefly and its cinematic follow-up Serenity. This series not only used Western ideas such as the lawless frontier and the spiritually wounded veteran, but also included Western elements in costuming, design and dialogue. The back-story of Firefly has been called a deliberate echo of the post-American-Civil-War setting of many Westerns, with a hero who fought for the losing side.

Other examples include:

The Beast Master - Andre Norton

Time Enough for Love - Robert A. Heinlein

A Princess of Mars - Edgar Rice Burroughs

Bravestarr

Ghosts of Mars