Silent Night, Deadly Night is a 1984 American slasher film directed by Charles E. Sellier Jr., and starring Robert Brian Wilson, Lilyan Chauvin, Gilmer McCormick, Toni Nero, and Linnea Quigley. The story concerns a young man named Billy Chapman, who suffers from post-traumatic stress over witnessing his parents' murder on Christmas Eve by a man disguised as Santa Claus and his subsequent upbringing in an abusive Catholic orphanage. In adulthood, the Christmas holiday leads him into a psychological breakdown, and he emerges as a spree killer donning a Santa suit.

The film was released by Tri-Star Pictures on November 9, 1984; it received substantial controversy over its promotional material and content, which featured a killer Santa Claus. In addition to receiving mixed reviews, it was pulled from theaters a week after its release. However, it was a success during its opening week, grossing $2.5 million on a budget of $750,000. Since its release, it has developed a cult following and spawned a series, consisting of four sequels, with the fourth and fifth installments having no connection to the original film, as well as a loose remake in 2012. Another reboot is in development.