Joe is a 1970 American drama film written by Norman Wexler and directed by John G. Avildsen. It stars Peter Boyle, Dennis Patrick, and Susan Sarandon in her film debut.After his daughter's drug overdose, a business executive attacks and kills her drug-dealing boyfriend. When he and a new friend are robbed by hippies, the duo decide to perform a vigilante attack at a hippie commune in Upstate New York. The mass murder of hippies goes as planned, but the executive realizes that his daughter was among the victims.

The film's plot coincidentally resembled a real-life mass murder in Detroit, where the killer had killed his own daughter. The real-life killer gained publicity for his actions, and received letters of support by hundreds of parents. The film has received praise for its black comedy-style satire of social class.