Thirteen Under One Hat (German: Dreizehn unter einem Hut) is a 1950 West German comedy film directed by Johannes Meyer and starring Inge Landgut, Volker von Collande and Ruth Leuwerik. It was shot at the Bendestorf Studios near Hamburg and on location around Bacharach, Assmannshausen, Kaub and Oberwesel in the Rhineland. The film's sets were designed by the art director Franz Schroedter. It is noted as marking the film debut of Leuwerik, a major star of postwar German cinema.
Evelyne, the daughter of a wealthy industrialist, is in love with the car mechanic Wolfgang who runs a garage with his friends Inge and Rudi. He seemingly shows no interest but Evelyne persists to win over his affections. During a trip to the River Rhine with other friends, Evelyne follows and keeps committing minor acts of sabotage in order to bring Wolfgang and herself closer. Eventually he falls for her, while Inge finds love with Rudi.