Fräulein Kreutune (フロイライン＝クロイトゥーネ Furoirain Kuroitūne?) is a character introduced in Shinyaku Toaru Majutsu no Index. She is a mysterious, seemingly human, woman who has existed since the age of witch hunts, and by the time of the Ichihanaran Festival Arc, was imprisoned inside the Windowless Building until being freed through the efforts of Kamijou Touma and Thor.