Samuel Guy Endore, born Samuel Goldstein and also known as Harry Relis, was an American novelist and screenwriter. During his career he produced a wide array of novels, screenplays, and pamphlets, both published and unpublished. A cult favorite of fans of horror, he is best known for his novel The Werewolf of Paris (1933), which occupies a significant position in werewolf literature, much in the same way that Dracula (1897) does for vampire literature. Endore is also known for his left-wing novel of the Haitian Revolution, Babouk: The Story of A Slave. He was nominated for a screenwriting Oscar for The Story of G.I. Joe (1945), and his novel Methinks the Lady. .. (1946) was the basis for Ben Hecht's screenplay for Whirlpool (1949).

The Werewolf of Paris (1933) is a horror novel as well as a work of historical fiction by American writer Guy Endore. The novel follows Bertrand Caillet, the eponymous werewolf, throughout the tumultuous events of the Franco-Prussian War and the Paris Commune of 1870–71. Some literature experts have compared this book with Dracula of Bram Stoker and they have identified it as the Dracula of Werewolves.