Henry: Portrait of a Serial Killer is an American movie directed by John McNaughton and starring Michael Rooker, Tom Towles, and Tracy Arnold.

Filmed in 1985 and budgeted on a mere $125,000, it was supposed to be released in 1986, but was caught in a firestorm in controversy for its gruesomely unforgiving violence. Threatened with the dreaded "X" MPAA rating, it caused a fierce debate between people who called it brilliant filmmaking (including the Village Voice's Ellliot Stein, who called one of the best films of 1986) and those who called it disgustingly shallow. Eventually, it was released nationwide in 1990 without an MPAA rating.

Henry is the story of a mass murderer (played by Michael Rooker) who kills not for revenge or money, but just for fun and to relieve boredom along with his idiot friend, Otis (Tom Towles), fresh out of prison and looking for a job. Otis' sister Becky (Tracy Arnold) moves in with them and finds the fact he killed his mother fascinating.

Based loosely on the confessions of Texas serial killer Henry Lee Lucas, Henry is a mixture of crime drama and horror, and is considered by many one of the best horror films of the 1980s. Some scenes are painfully disturbing to some such as a scene where Henry and Otis invade a home, kill a family and videotape the entire incident. This is an example of a cult film.