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Ghosts.Kaidan (怪談) is a Japanese word consisting of two kanji: 怪 (kai) meaning "strange, mysterious, rare or bewitching apparition" and 談 (dan) meaning "talk" or "recited narrative." In its broadest sense, kaidan refers to any ghost or horror story, but it has an old-fashioned ring to it that carries the connotation of Edo period Japanese folktales.

The term is no longer as widely used in Japanese as it once was: J-Horror books and films such as Ju-on and Ring would more likely be labelled by the katakana horā (ホラー, horā? "horror") or the standard Japanese kowai hanashi (怖い話, kowai hanashi? "scary story"). Kaidan is only used if the author/director wishes to specifically bring an old fashioned air into the story.