Bad Santa (known as Badder Santa on the unrated DVD) is a 2003 American Christmas criminal black comedy film directed by Terry Zwigoff, and starring Billy Bob Thornton, Tony Cox, Brett Kelly, Lauren Graham, Lauren Tom, Bernie Mac, and John Ritter. This was John Ritter's last film appearance before his death on September 11, 2003. The Coen brothers are credited as executive producers. The film was released in the United States on November 21, 2003.

The film was screened out of competition at the 2004 Cannes Film Festival.

An unrated version was released on DVD on March 5, 2004 and on Blu-ray Disc on November 20, 2007 as Bad(der) Santa. A director's cut DVD was released in November 2006; it features Zwigoff's cut of the film (including an audio commentary with him and the film's editor), which is three minutes shorter than the theatrical cut and ten minutes shorter than the unrated version. More: en.wikipedia.org.