Let Sleeping Cops Lie also known as Don't Wake a Sleeping Cop (French: Ne réveillez pas un flic qui dort) is a French crime film released in 1988, directed by José Pinheiro, starring Alain Delon and Michel Serrault. The screenplay is written by Alain Delon and José Pinheiro based on the novel Clause de style by Frédéric H. Fajardie.

The movie tells the story of police inspector Eugéne Grindel (Delon) who investigates the secret illegal ultra-right police organization which mete out justice on a fast track.

Let Sleeping Cops Lie is the last film of a group of popular movies released in the 1980s and starring Alain Delon, which share a visual and narrative style, beginning with Jacques Deray's Three Men to Kill (1980). It was the least successfully commercially.

Alain Delon, also being the film’s producer, dedicated the work to the memory of actor Jean Gabin.