The Fan is a 1981 American psychological thriller film directed by Edward Bianchi and starring Lauren Bacall, Michael Biehn, James Garner, and Maureen Stapleton. The plot follows a famous stage and film actress named Sally Ross (Bacall) who is stalked by a violent, deranged fan (Biehn), who begins killing those around her. The screenplay by Priscilla Chapman and John Hartwell was based on the 1977 novel of the same title by Bob Randall.


Douglas Breen, a deranged young New York City record store clerk, writes a rambling letter to stage and film star Sally Ross, reading: "Dear Miss Ross, I am your greatest fan, because unlike the others, I want nothing from you. The only thing that matters to me is your happiness."