Dan Simmons is an American science fiction and horror writer. He is the author of the Hyperion Cantos and the Ilium/Olympos cycles, among other works that span the science fiction, horror, and fantasy genres, sometimes within a single novel.

Simmons's genre-intermingling Song of Kali (1985) won the World Fantasy Award. He also writes mysteries and thrillers, some of which feature the continuing character Joe Kurtz.