Cast from Theorem
Terence Stamp
The Visitor
Silvana Mangano
Lucia, the Mother
Massimo Girotti
Paolo, the Father
Anne Wiazemsky
Odetta, the Daughter
Andrés José Cruz Soublette
Pietro, the Son
Laura Betti
Emilia, the Servant
Ninetto Davoli
Angelino, the Messenger
Carlo De Mejo
Lucia's first lover
Adele Cambria
Emilia, the Second Servant
Luigi Barbini
Boy at the station
Giovanni Ivan Scratuglia
Lucia's second lover
Alfonso Gatto
Doctor
Cesare Garboli
Interviewer (uncredited)
Susanna Pasolini
Old Peasant (uncredited)