Silent Night, Deadly Night 4: Initiation is a 1990 American supernatural horror film directed by Brian Yuzna, written by Yuzna, Woody Keith, and Arthur Gorson, and starring Maud Adams, Tommy Hinkley, Allyce Beasley, Clint Howard and Neith Hunter. It focuses on a Los Angeles newspaper reporter who, while investigating the unexplained death of a woman, becomes entangled with a coven of Lilith-worshipping witches who are preparing her for a ritual on Christmas Eve. The fourth installment in the Silent Night, Deadly Night film series, it bears no resemblance to the previous films, as it drops the storyline of the Billy Chapman character entirely.

The film was developed from a screenplay by Keith, which was reshaped by Yuzna after he was hired to direct the film. Yuzna incorporated additional elements such as the coven's focus on Lilith, as well as many of the insect creatures and visual references to Franz Kafka's The Metamorphosis. Principal photography occurred in Los Angeles in the spring of 1990, with the elaborate special effects crafted by Screaming Mad George.

Silent Night, Deadly Night 4: Initiation was released directly-to-video in the United States by LIVE Entertainment on November 21, 1990. In the United Kingdom, it was released under the alternative title Bugs. It is followed by Silent Night, Deadly Night 5: The Toy Maker (1991).