The Fifth Cord

The Fifth Cord
Directed by	Luigi Bazzoni
Produced by	Manolo Bolognini
Screenplay by	Mario di Nardo Mario Fanelli Luigi Bazzoni
Based on	The Fifth Cord by David McDonald Devine (as D.M. Devine)
Starring	Franco Nero Silvia Monti Rossella Falk Edmund Purdom Maurizio Bonuglia Pamela Tiffin
Music by	Ennio Morricone
Cinematography	Vittorio Storaro
Edited by	Eugenio Alabiso
Production company	B.R.C. Produzione S.r.l. Dario S.r.c.
Distributed by	Jumbo Cinematografica
Release date	28 August 1971
Running time	90 minutes
Country	Italy
Language	Italian

The Fifth Cord (Italian: Giornata nera per l'ariete, lit. "Black day for Aries") is a 1971 Italian giallo film directed by Luigi Bazzoni. The film's Italian title reprises Dario Argento's practice of using animals in the titles of his thriller films. The film is based on a novel with the same name by D.M. Devine.

AllMovie called it an "outstanding giallo thriller".