Seabury Grandin Quinn was an American government lawyer, journalist, and pulp magazine author, most famous for his stories of the occult detective Jules de Grandin, published in Weird Tales.

Occult detective fiction is a subgenre of detective fiction that combines the tropes of the main genre with those of supernatural, fantasy and/or horror fiction. Unlike the traditional detective who investigates murder and other common crimes, the occult detective is employed in cases involving ghosts, demons, curses, magic, vampires, undead, monsters and other supernatural elements. Some occult detectives are portrayed as being psychic or in possession of other paranormal or magical powers.