Public Enemies is a 2009 American biographical crime drama film directed by Michael Mann, who co-wrote the screenplay with Ronan Bennett and Ann Biderman. It is an adaptation of Bryan Burrough's 2004 non-fiction book Public Enemies: America's Greatest Crime Wave and the Birth of the FBI, 1933–34. Set during the Great Depression, the film chronicles the final years of the notorious bank robber John Dillinger (Johnny Depp) as he is pursued by FBI agent Melvin Purvis (Christian Bale), Dillinger's relationship with Billie Frechette (Marion Cotillard), as well as Purvis' pursuit of Dillinger's associates and fellow criminals John "Red" Hamilton (Jason Clarke), Homer Van Meter (Stephen Dorff), Harry Pierpont (David Wenham), and Baby Face Nelson (Stephen Graham).

Burrough originally intended to make a television miniseries about the Depression-era crime wave in the United States, but decided to write a book on the subject instead. Mann developed the project, and some scenes were filmed on location where they occurred, though the film is not entirely historically accurate. Released on July 1, 2009, the film received generally positive reviews from critics and grossed $214 million worldwide.