Down the Ancient Staircase () is a 1975 Italian-French drama film directed by Mauro Bolognini.
In Italy, in 1930, Professor Bonaccorsi, renowned psychiatrist, conducts research on madness in the asylum where he works as a doctor in Tuscany. He has three mistresses: Bianca, his assistant; Carla, a colleague's wife; and Francesca, the wife of the asylum's director.