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Silent Night, Deadly Night is a 1984 American Christmas slasher film directed by Charles E. Sellier Jr., and starring Robert Brian Wilson, Lilyan Chauvin, Gilmer McCormick, Toni Nero and Linnea Quigley. The film follows the life of Billy Chapman, who, as a child, witnesses his parents' brutal double murder on Christmas Eve by a man disguised as Santa Claus. His subsequent upbringing in a dysfunctional Catholic orphanage and untreated post-traumatic stress disorder lead him toward a psychological breakdown in adulthood, and he emerges as a spree killer donning a Santa suit during the holiday.

Inspired by a draft screenplay by Paul Caimi, producers Scott Schneid and Dennis Whitehead developed the story for the film over the course of several years, eventually commissioning screenwriter Michael Hickey to complete a redeveloped screenplay. Producer Ira Barmak, who had recently secured a contract to produce several low-budget films for Tri-Star Pictures, became attached to the project. Principal photography occurred mainly in Heber City and Midway, Utah in the late spring of 1984 under the working title Slayride.

Silent Night, Deadly Night received significant controversy from the public due to its graphic depiction of a killer clad in a Santa suit, an element that was highlighted in the film's promotional artwork and television advertisements. As a result, it initially received scathing reviews from critics which fueled the public backlash even further. Tri-Star Pictures released the film in a limited theatrical release on November 9, 1984 in the Midwestern and Northeastern United States with the hopes of giving it a more wider release later in December. However, the controversy and public backlash caused Tri-Star to pull the film out of theaters just a week after its initial release and the planned wide release was cancelled. Despite its brief release, the film was a modest financial success, earning $2.5 million against a $750,000 budget.

The film has gone on to develop a cult following and spawned a series, consisting of four sequels, as well as a loose remake in 2012 and a reboot in 2025.