Heinz Rühmann as Dr. Johannes Pfeiffer/Hans Pfeiffer

Karin Himboldt as Eva Knauer

Hilde Sessak as Marion

Erich Ponto as Professor Crey, genannt Schnauz

Paul Henckels as Professor Bömmel

Hans Leibelt as Gymnasialdirektor Knauer, genannt Zeus

Lutz Götz as Oberlehrer Dr. Brett

Hans Richter as Rosen

Clemens Hasse as Rudi Knebel

Rudi Schippel as Streber Luck

Georg-Michael Wagner as Ackermann

Hedwig Wangel as Haushälterin bei Crey

Anneliese Würtz as Witwe Windscheidt

Margarete Schön as Frau Direktor Knauer

Max Gülstorff as Herr Oberschulrat

Egon Vogel as Musiklehrer Fridolin

Ewald Wenck as Kastellan Kliemke

Albert Florath as Mitglied der Bowlenrunde

Karl Etlinger as Mitglied der Bowlenrunde

Georg H. Schnell as Mitglied der Bowlenrunde

Georg Vogelsang as Mitglied der Bowlenrunde