When a Stranger Calls is a 1979 American psychological horror film written and directed by Fred Walton, co-written by Steve Feke, and starring Charles Durning, Carol Kane, Colleen Dewhurst and Tony Beckley. Its plot follows Jill Johnson, a young woman being terrorized by a psychopathic killer while babysitting, the killer's stalking of another woman, his returning to torment Jill years later, and a detective's trying to find him. Rachel Roberts, Ron O'Neal, Carmen Argenziano, and Rutanya Alda appear in supporting roles. The film derives its story from the folk legend of "the babysitter and the man upstairs".

Charles Edward Durning was an American actor who appeared in over 200 movies, television shows and plays. Durning's best-known films include The Sting (1973), Dog Day Afternoon (1975), The Muppet Movie (1979), True Confessions (1981), Tootsie (1982), Dick Tracy (1990), and O Brother, Where Art Thou? (2000). He was nominated for the Academy Award for Best Supporting Actor for both The Best Little Whorehouse in Texas (1982) and To Be or Not to Be (1983). Prior to his acting career, Durning served in World War II and was decorated for valor in combat.