A ghost story is any piece of fiction, or drama, that includes a ghost, or simply takes as a premise the possibility of ghosts or characters' belief in them. The "ghost" may appear of its own accord or be summoned by magic. Linked to the ghost is the idea of a "haunting", where a supernatural entity is tied to a place, object or person. Ghost stories are commonly examples of ghostlore.
Colloquially, the term "ghost story" can refer to any kind of scary story. In a narrower sense, the ghost story has been developed as a short story format, within genre fiction. It is a form of supernatural fiction and specifically of weird fiction, and is often a horror story.