You Should Have Left is a 2020 American psychological horror film written and directed by David Koepp, based on the 2017 book of the same name by Daniel Kehlmann. It stars Kevin Bacon and Amanda Seyfried. Jason Blum served as a producer through his Blumhouse Productions banner.

David Koepp is an American screenwriter and director. He is the ninth most successful screenwriter of all time in terms of U.S. box office receipts with a total gross of over $2.3 billion. Koepp has achieved both critical and commercial success in a wide variety of genres: thriller, science fiction, comedy, action, drama, crime, superhero, horror, adventure, and fantasy.