Mistress Moon (German: Frau Luna) is a 1941 German musical comedy film directed by Theo Lingen and starring Lizzi Waldmüller, Fita Benkhoff and Irene von Meyendorff. An operetta film, it is based on the stage work Frau Luna composed by Paul Lincke. It was shot at the Halensee Studios in Berlin. The film's sets were designed by the art directors Heinrich Beisenherz and Alfred Bütow.