Unusual Suspects is an American television documentary program on Investigation Discovery. The program debuted on June 21, 2010. It showcases many of the most shocking and difficult cases in law enforcement history, and also sheds light on the investigations that led to the arrest of the culprits. On June 17, 2016, the show was cancelled after eight seasons, due to notices of termination by Discovery. In October 2017, a sequel returned to Investigation Discovery, Unusual Suspects: Deadly Intent; Investigation Discovery officially presents it on its website as a new production on its first season.

A second sequel, Unusual Suspects: Welcome To ChildHorror, is in development with three seasons, as it resolves around Children killing their own parents.