Deep Red (Italian: Profondo rosso), also known as The Hatchet Murders, is a 1975 Italian giallo film directed by Dario Argento and co-written by Argento and Bernardino Zapponi. It stars David Hemmings as a musician who investigates a series of murders performed by a mysterious figure wearing black leather gloves. The cast also stars Daria Nicolodi, Gabriele Lavia, Macha Méril, and Clara Calamai. The film's score was composed and performed by Goblin, the first in a long-running collaboration with Argento.

The film was released during the height of the "giallo craze" of Italian popular cinema, and was a critical and commercial success. Retrospective reviews have been equally positive, and the film is considered one of the genre's definitive entries, as well as one of Argento's best works.