John Phillip Law
Role: Diabolik
Marisa Mell
Role: Eva Kant
Michel Piccoli
Role: Inspector Ginko
Adolfo Celi
Role: Ralph Valmont
Claudio Gora
Role: Police Chief
Mario Donen
Role: Sgt. Danek
Renzo Palmer
Role: Mr. Hammond
Caterina Boratto
Role: Lady Clark
Lucia Modugno
Role: Prostitute
Annie Gorassini
Role: Rose
Carlo Croccolo
Role: Lorry Driver
Lidia Biondi
Role: Policewoman
Andrea Bosic
Role: Bank Manager
Tiberio Mitri
Role: Valmont's Henchman #1
Isarco Ravaioli
Role: Valmont's Henchman #2
Giorgio Sciolette
Role: Dr. Ferrar
Terry-Thomas
Role: Minister of Interior / Minister of Finance
Giulio Donnini
Role: Dr. Vernier (uncredited)
Edward Febo Kelleng
Role: Sir Harold Clark (uncredited)
Sandro Dori
Role: Stud (uncredited)
Giorgio Gennari
Role: Rudy (uncredited)
Giuseppe Fazio
Role: Tony (uncredited)
Massimo Ciprari
Role: Fake Diplomat (uncredited)
Franco Bellucci
Role: Fake Diplomat (uncredited)
Orlando Pallamari
Role: Mr. Hammond's Secretary (uncredited)
Francesco Mulè
Role: (uncredited)
Angela Palmieri
Role: Dr. Vernier's Nurse (uncredited)
Milena Zampana
Role: Party Guest (uncredited)
Raniero Dorascenzi
Role: Party Guest (uncredited)
Vezio Natili
Role: Party Guest (uncredited)
Lella Cattaneo
Role: Party Guest (uncredited)
Renzo Granelli
Role: Party Guest (uncredited)
Mario Ingrassia
Role: Party Guest (uncredited)
Filippo Perego
Role: Party Guest (uncredited)
Augusto Innocenzi
Role: Party Guest (uncredited)
Domenico Ravenna
Role: Party Guest (uncredited)
Silvio Klein
Role: Journalist at Press Conference (uncredited)
Oscar Sciamanna
Role: Journalist (uncredited)
Regina Elena Bisio
Role: Old Woman at the Morgue (uncredited)