Gian Maria Volonté as Enrico Mattei

Luigi Squarzina as liberal journalist

Peter Baldwin as William McHale

Renato Romano as journalist

Franco Graziosi as Minister of State partecipations

Gianfranco Ombuen as Mr. Ferrari, the engineer

Elio Jotta as head of the Committee of Inquiry

Luciano Colitti as Irnerio Bertuzzi

Edda Ferronao as Mrs. Mattei

Accursio Di Leo as Sicilian character

Terenzio Cordova as police officer

Giuseppe Lo Presti as Sicilian character

Camillo Milli as TV journalist

Aldo Barberito as Mauro De Mauro

Jean Rougeul as French journalist

Dario Michaelis as Carabinieri officer

Vittorio Fanfoni as journalist

Nino Drago as journalist

Néstor Garay as journalist

Felice Fulchignoni as Sicilian character

Sennuccio Benelli as Self / journalist

Furio Colombo as Mattei's assistant

Ugo Zatterin as Self / journalist

Blaise Morrissey as American oilman

Gianni Farneti as Self / journalist

Alessio Baume as "Time" journalist

Umberto D'Arrò as Self / journalist

Salvo Licata as Self / journalist

Giuseppe Rosselli as Self / journalist

Ferruccio Parri as Self (archival footage)

Michele Pantaleone as Self

Arrigo Benedetti as Self

Thyraud De Vosjoli as Self

Francesco Rosi as Self (uncredited)

Andrea Artoni as Self / flight assistant (uncredited)

Edy Biagetti as Mattei's bodyguard (uncredited)