Gone Baby Gone is a 2007 American neo-noir crime thriller film directed by Ben Affleck in his directorial debut. Affleck co-wrote the screenplay with Aaron Stockard based on the 1998 novel of the same name by Dennis Lehane. The film stars Casey Affleck and Michelle Monaghan as two Boston private investigators hunting for a young girl abducted from her single mother's apartment in Dorchester. The supporting cast includes Morgan Freeman, Ed Harris, and Amy Ryan. It was the final film to be released by The Ladd Company before its closure on December 19, 2007.

Released on October 19, 2007, Gone Baby Gone was well-received by critics and grossed $34 million worldwide against a $19 million budget. Ben Affleck was lauded for his directing debut by critics, while Amy Ryan received an Oscar nomination for Best Supporting Actress.