Karl Kostlin
Karl Köstlin is the name of the following people:
- Karl von Köstlin (lawyer) (1827–1909), German lawyer and prison director
- Karl Köstlin (director) (1886–1960), German director, screenwriter and actor
- Karl Heinrich Gotthilf von Köstlin (1787-1859), German physician
- Karl Reinhold von Köstlin (1819–1894), German Protestant theologian, esthete and literary historian
- Karl Wilhelm Gottlieb von Köstlin (1785–1854), German Protestant theologian and university professor