Filth is a 2013 psychological black comedy crime thriller film written and directed by Jon S. Baird, based on Irvine Welsh's 1998 novel Filth. The film was released on 27 September 2013 in Scotland, 4 October 2013 elsewhere in the United Kingdom and in Ireland, and on 30 May 2014 in the United States. It stars James McAvoy, Jamie Bell, and Jim Broadbent.

Filth marked the final film role of David Soul, in a cameo role.

Set in Edinburgh, the film follows misanthropic Detective Sergeant investigating a murder case, beset with mental health problems following the end of his marriage. He suffers from borderline personality disorder, feelings of guilt over the death of his brother, a newfound need to cross-dress as his wife, and (eventually) suicidal ideation.