John Phillip Law

Diabolik

Marisa Mell

Eva Kant

Michel Piccoli

Inspector Ginko

Adolfo Celi

Ralph Valmont

Claudio Gora

Police Chief

Mario Donen

Sgt. Danek

Renzo Palmer

Mr. Hammond

Caterina Boratto

Lady Clark

Lucia Modugno

Prostitute

Annie Gorassini

Rose

Carlo Croccolo

Lorry Driver

Lidia Biondi

Policewoman

Andrea Bosic

Bank Manager

Federico Boido

Joe

Tiberio Mitri

Valmont's Henchman #1

Isarco Ravaioli

Valmont's Henchman #2

Giorgio Sciolette

Dr. Ferrar

Terry-Thomas

Minister of Interior / Minister of Finance

Giulio Donnini

Dr. Vernier (uncredited)

Edward Febo Kelleng

Sir Harold Clark (uncredited)

Sandro Dori

Stud (uncredited)

Giorgio Gennari

Rudy (uncredited)

Giuseppe Fazio

Tony (uncredited)

Massimo Ciprari

Fake Diplomat (uncredited)

Franco Bellucci

Fake Diplomat (uncredited)

Orlando Pallamari

Mr. Hammond's Secretary (uncredited)

Francesco Mulè

(uncredited)

Angela Palmieri

Dr. Vernier's Nurse (uncredited)

Milena Zampana

Party Guest (uncredited)

Raniero Dorascenzi

Party Guest (uncredited)

Vezio Natili

Party Guest (uncredited)

Lella Cattaneo

Party Guest (uncredited)

Renzo Granelli

Party Guest (uncredited)

Mario Ingrassia

Party Guest (uncredited)

Filippo Perego

Party Guest (uncredited)

Augusto Innocenzi

Party Guest (uncredited)

Domenico Ravenna

Party Guest (uncredited)

Silvio Klein

Journalist at Press Conference (uncredited)

Oscar Sciamanna

Journalist (uncredited)

Regina Elena Bisio

Old Woman at the Morgue (uncredited)