Il coltello di ghiaccio (lit. English: Knife of Ice) is a 1972 giallo film directed by Umberto Lenzi and starring Carroll Baker, Evelyn Stewart, and George Rigaud. Both Baker and Stewart featured in several other films helmed by Lenzi. The film follows a mute woman who finds herself in danger when a serial killer begins stalking the Spanish countryside. The title takes its name from a quote attributed to Edgar Allan Poe, in which he refers to fear as a "knife of ice which penetrates the senses down to the depth of conscience"; the quote, however, was a fabrication by the filmmakers.

The film marked the fourth and final collaboration between actress Baker and director Lenzi, after she had starred in three of his previous films: So Sweet... So Perverse, Orgasmo, and A Quiet Place to Kill.

Elements of the film's script and direction have been cited as being reminiscent of works by fellow Italian Lucio Fulci. AllMovie's Robert Firsching has noted that Il coltello di ghiaccio "should prove fascinating to genre devotees."