Mountain Crystal is a 1949 Austrian-German historical drama film directed by Harald Reinl and featuring a cast of unknown actors including Franz Eichberger, Hans Renz and Cilli Greif. It is a mountain film based on the 1845 classic novella Rock Crystal by Adalbert Stifter. The film's sets were designed by the Austrian art director Fritz Jüptner-Jonstorff. It was the directorial debut of Reinl who went on to become a successful film director.