He Knows You're Alone
- Jaar: 1980
- Land: United States of America
- Genre: Horror
- Studio: Metro-Goldwyn-Mayer, Lansbury/Beruh Productions
- Trefwoord: insanity, detective, shower, blackout, bride, stalker, murder, urban legend, decapitation, serial killer, maniac, stripping, psycho killer, funhouse, dance studio, stabbed to death
- Regisseur: Armand Mastroianni
- Gips: Caitlin O'Heaney, Elizabeth Kemp, Dana Barron, Don Scardino, Tom Hanks, James Rebhorn