Bruno S. as Kaspar Hauser

Walter Ladengast as Professor Daumer

Brigitte Mira as Haushälterin Käthe

Willy Semmelrogge as Ringmaster

Kidlat Tahimik as Hombrecito, the Indian

Hans Musäus as Unknown Man

Michael Kroecher as Lord Stanhope

Henry van Lyck as Calvary Captain

Enno Patalas as Pastor Fuhrmann

Volker Elis Pilgrim as Pastor #2

Volker Prechtel as Hiltel, the prison guard

Gloria Doer as Frau Hiltel

Helmut Döring as Little King

Andi Gottwald as young Mozart

Herbert Achternbusch as country boy #1

Wolfgang Bauer as country boy #2

Walter Steiner as country boy #3

Clemens Scheitz as Registrar

Johannes Buzalski as Police Officer

Willy Meyer-Fürst as Doctor

Florian Fricke as Florian

Alfred Edel as Logic Professor

Franz Brumbach as bear showman

Herbert Fritsch as Mayor

Wilhelm Bayer as employee of the captain

Peter Gebhart as man who finds Kaspar

Otto Heinzle as old priest

Dorothea Kraft as little girl

Dr. Walter Pflaum as Doctor #2

Dr. Heinz Niemöller as Doctor #3

Peter-Udo Schönborn as crier

Markus Weller as Julius

Reinhard Hauff as Bauer - role was cut