My Bloody Valentine is a 1981 Canadian slasher film directed by George Mihalka and written by John Beaird. It stars Paul Kelman, Lori Hallier, and Neil Affleck. The plot tells about a group of young adults who decide to throw a Valentine's Day party, only to incur the vengeful wrath of a maniac in mining gear who begins a killing spree.

Conceived and produced entirely over the course of around a year, the film was shot on location in Sydney Mines, Nova Scotia, in the fall of 1980. It was theatrically released on February 11, 1981 by Paramount Pictures, coinciding with the Valentine's holiday. Despite a mixed response from critics and grossing $5.7 million at the box office, the film has developed a large cult following over the years since its release.

My Bloody Valentine faced notable censorship, having a total of nine minutes cut by the Motion Picture Association of America due to the amount of violence and gore.