When the Mad Aunts Arrive (German: Wenn die tollen Tanten kommen) is a 1970 West German musical comedy film directed by Franz Josef Gottlieb and starring Rudi Carrell, Ilja Richter, and Chris Roberts. In one of a group of films during the era inspired by the cross-dressing plot of Charley's Aunt, two men end up at a Carinthian hotel resort disguised as females. This leads to confusion during their romantic pursuit of woman.

The film was shot on location in Munich and the Wörthersee in Austria. The film's sets were designed by Eberhard Schröder.