 Montgomery CliftSigmund Freud | Sigmund Freud |
 Susannah YorkCecily Koertner | Cecily Koertner |
 Larry ParksDr. Joseph Breuer | Dr. Joseph Breuer |
 Susan KohnerMartha Freud | Martha Freud |
 Eileen HerlieFrau Ida Koertner | Frau Ida Koertner |
 Fernand LedouxDr. Charcot | Dr. Charcot |
 David McCallumCarl von Schlossen | Carl von Schlossen |
 Rosalie CrutchleyFrau Amalia Freud | Frau Amalia Freud |
 David KossoffJacob Freud | Jacob Freud |
 Joseph FürstHerr Jacob Koertner | Herr Jacob Koertner |
| AAlexander MangoBabinsky | Babinsky |
 Leonard SachsBrouhardier | Brouhardier |
 Eric PortmanDr. Theodore Meynert | Dr. Theodore Meynert |
 John HustonNarrator (voice) (uncredited) | Narrator (voice) (uncredited) |
| OOl Abdou(uncredited) | (uncredited) |
 Manfred AndraeStudent Doctor (uncredited) | Student Doctor (uncredited) |
| VVictor BeaumontDr. Guber (uncredited) | Dr. Guber (uncredited) |
 Allan CuthbertsonWilkie (uncredited) | Wilkie (uncredited) |
 Eduard LinkersDr. Torsch (uncredited) | Dr. Torsch (uncredited) |
 Ferdy MayneQuestioner at Final Lecture (uncredited) | Questioner at Final Lecture (uncredited) |
 Elisabeth Neumann-ViertelFrau Bernays (uncredited) | Frau Bernays (uncredited) |
 Maria PerschyMagda (uncredited) | Magda (uncredited) |
 Moira RedmondNora Wimmer (uncredited) | Nora Wimmer (uncredited) |
 Charles Regnier(uncredited) | (uncredited) |
 Stefan SchnabelChairman of Medical Profession in Vienna (uncredited) | Chairman of Medical Profession in Vienna (uncredited) |
