Night's Black Agents is a collection of fantasy and horror short stories by American writer Fritz Leiber. It was released in 1947 and was the author's first book. The book's title is taken from Macbeth, Act III, scene ii. It was published by Arkham House in an edition of 3,084 copies. Most of the stories originally appeared in the magazines Unknown and Weird Tales. Three were first published in this book. The last two stories showcase Leiber's Sword and Sorcery heroes Fafhrd and the Gray Mouser.