Stig Järrel as Caligula

Alf Kjellin as Jan-Erik Widgren

Mai Zetterling as Bertha Olsson

Olof Winnerstrand as Headmaster

Gösta Cederlund as Pippi

Hugo Björne as Dr. Nilsson

Olav Riégo as Mr. Widgren

Märta Arbin as Mrs. Widgren

Jan Molander as Pettersson

Gunnar Björnstrand as Teacher

Birger Malmsten as Kreutz, student

Stig Olin as Sandman, student

Richard Lund as Teacher (uncredited)

Carl-Olof Alm as

Gunnar Almqvist as

Ingmar Bergman as

Rolf Bergström as

Bengt Carenborg as

Nils Dahlgren as

Bengt Dalunde as

Edvard Danielsson as

Curt Edgard as

Sten Gester as

Palle Granditsky as

Carl-Einar Gregmar as

Gunnar Hedberg as

Gustaf Hedström as

Torsten Hillberg as

Nils Hultgren as

Allan Linder as

Lennart Nyberg as

Anders Nyström as

Bengt Persson as

Arne Ragneborn as

Bertil Solberg as

Greta Stave as

Lillie Wästfeldt as

John Zacharias as

Tom Österholm as