The Nightmare Before Christmas (also known as Tim Burton's The Nightmare Before Christmas) is a 1993 American gothic stop motion animated musical fantasy film directed by Henry Selick in his feature directorial debut and produced and conceived by Tim Burton. It tells the story of Jack Skellington, the King of "Halloween Town", who stumbles upon "Christmas Town" and schemes to take over the holiday. Danny Elfman wrote the songs and score and provided the singing voice of Jack. The principal voice cast includes Chris Sarandon, Catherine O'Hara, William Hickey, Ken Page, Paul Reubens, Glenn Shadix and Ed Ivory.

The Nightmare Before Christmas originated from a poem written by Burton in 1982 while he was working as an animator at Walt Disney Productions. With the critical success of Vincent that same year, Burton began to consider developing the film as either a short film or a half-hour television special, to no avail. Over the years, Burton's thoughts regularly returned to the project, and, in 1990, he made a development deal with Walt Disney Studios. Production started in July 1991 in San Francisco; Disney initially released the film through the Touchstone Pictures label because the studio believed the film would be "too dark and scary for kids".

The Nightmare Before Christmas premiered at the New York Film Festival on October 9, 1993, and was given a limited release on October 13, before its wide theatrical release on October 29. The film was met with commercial and critical success upon release, earning praise for its animation, particularly the innovation of stop-motion as an art form, as well as its characters, songs, and score. While initially a modest box office hit, it has since garnered a large cult following and is widely regarded as one of the greatest animated films of all time. It was nominated for the Academy Award for Best Visual Effects, a first for an animated film, but lost to Jurassic Park. Thirteen years after its initial release, the film was reissued by Walt Disney Pictures and was re-released annually in Disney Digital 3-D from 2006 until 2010.

In 2023, the film was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically or aesthetically significant."