Joseph Balsamo aka Count Cagliostro

Orson Welles

Marie Antoinette/Lorenza

Nancy Guild

Gitano

Akim Tamiroff

Alexandre Dumas, Jr.

Raymond Burr

Zoraida

Valentina Cortese

Gilbert de Rezel

Frank Latimore

Mme. du Barry

Margot Grahame

Viscount de Montagne

Stephen Bekassy

Alexandre Dumas Sr.

Berry Kroeger

Chambord/Monk

Gregory Gay

Dr. Franz Anton Mesmer

Charles Goldner

King Louis XVI / Innkeeper

Lee Kresel

King Louis XV

Robert Atkins

De Remy

Nicholas Bruce

Chico

Franco Corsaro

Anielo Mele

Joseph Balsamo as a Child

Annielo Mele

Court President

Ronald Adam

Crown Prosecutor

Bruce Belfrage

Dr. Duval / Baron von Minden

Alexander Danaroff

Lee Lenoir

Gaston / Beniamino Balsamo (as Leon Lenoir)

Leonardo Scavino

Maria Balsamo

Tamara Shayne

Giovanni Van Hulzen

Minister of Justice

Joop van Hulzen

Dr. Mesmer's Friend

Peter Trent

Boehmer

Giuseppe Varni

Tatiana Pavlowa

Grieving Mother

Tatyana Pavlova

(uncredited)

Harriet Medin

(uncredited)

Valentino Bruchi

(uncredited)

Silvana Mangano

(uncredited)

Ludmilla Dudarova

(uncredited)

Rosina Galli

(uncredited)

Filippo Minelli

(uncredited)

Michele Sakara

(uncredited)

Nicholas Soussanin

(uncredited)

Milly Vitale