One Tough Cop is a 1998 American action crime film. It was directed by Bruno Barreto and written by Jeremy Iacone. The movie stars Stephen Baldwin as the protagonist and first-person narrator Bo Dietl, a real-life New York City detective who wrote the book that the film is based on. Chris Penn costars as Dietl's partner. Gina Gershon, Mike McGlone and Paul Guilfoyle also play key roles.