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

Crematoria Operator (uncredited)

Wolfgang Hillinger

Valmont's Henchman (uncredited)

Angela Palmieri

Dr. Vernier's Nurse (uncredited)

Regina Elena Bisio

Old Woman at the Morgue (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)

Guido Barlocci

Party Guest (uncredited)

Umberto Fantoni

Party Guest (uncredited)

Ugo Ballester

Journalist at Press Conference (uncredited)

Enzo Mondino

Journalist at Press Conference (uncredited)

Carlo Micolano

Journalist at Press Conference (uncredited)

Ferruccio Fregonese

Journalist at Press Conference (uncredited)

Angelo Casadei

Journalist at Press Conference (uncredited)

Mario Pascucci

Journalist at Press Conference (uncredited)

Silvio Klein

Journalist at Press Conference (uncredited)

Bruno Degni

Journalist at Press Conference (uncredited)

Oscar Sciamanna

Reporter (uncredited)