Black Mass is a 2015 American biographical crime drama film directed by Scott Cooper and written by Mark Mallouk and Jez Butterworth, based on the 2001 book Black Mass: The True Story of an Unholy Alliance Between the FBI and the Irish Mob by Dick Lehr and Gerard O'Neill. The film has an ensemble cast including Johnny Depp, Joel Edgerton, Benedict Cumberbatch, Kevin Bacon, Jesse Plemons, Peter Sarsgaard, Rory Cochrane, Adam Scott, Julianne Nicholson, Dakota Johnson and Corey Stoll.

The film follows the criminal career of infamous American mobster James "Whitey" Bulger (Depp). Principal photography of the film began on May 19, 2014 in Boston, and wrapped on August 1, 2014. It had its world premiere at the 72nd Venice International Film Festival and was released by Warner Bros. worldwide on September 18, 2015. It received generally positive reviews and grossed $99 million.