Mysterious Shadows () is a 1949 Austrian drama film directed by G. W. Pabst and starring Paul Hubschmid, Ilse Werner, and Elfe Gerhart. It was shown at the Venice Film Festival. It was shot at the Rosenhügel Studios in Vienna and at the Hoher Dachstein ice caves. The film's sets were designed by the art director Isabella Schlichting and Werner Schlichting.
Dr. Wittich is a passionate speleologist who devotes more time to his research than to his fiancée, Cornelia. As a result, she turns to the wealthy industrialist Roy, whom she eventually marries. However, her heart truly belongs to the explorer, and she is drawn back to him. When they finally venture together into a cave system in the Pyrenees and explore its "mysterious depths," they perish within it.