I Was Jack Mortimer (German: Ich war Jack Mortimer) is a 1935 German thriller film directed by Carl Froelich and starring Anton Walbrook, Eugen Klöpfer, and Sybille Schmitz. It was shot at the Tempelhof Studios in Berlin. The film's sets were designed by the art director Franz Schroedter. It is an adaptation of the 1933 novel of the same title by Alexander Lernet-Holenia.