Tor Books is an American book publishing company. It is one of two imprints of Tom Doherty Associates, LLC, based in New York City. It is noted for its science fiction and fantasy books. Tom Doherty Associates also publishes mainstream fiction, mystery, and some military history books under its Forge imprint. Tom Doherty Associates, LLC, was formed by Tom Doherty in 1980, and sold to St. Martin's Press in 1986. Along with St. Martin's Press, Henry Holt, and Farrar Straus Giroux, it is now part of the Holtzbrinck group.