Knock Knock
- Tahun: 2015
- Negara: Chile, Germany, United States of America
- Genre: Horror, Thriller
- Studio: Sobras International Pictures, UFA, Black Bear Pictures, Camp Grey, Elevated Films, Movie Trailer House, Dragonfly Entertainment, Voltage Pictures
- Kata kunci: adultery, infidelity, cake, disc jockey, rain, architect, seduction, torture, art, home invasion, extramarital affair, threesome, seductress, erotic thriller, married man
- Pengarah: Eli Roth
- Pelakon: Keanu Reeves, Lorenza Izzo, Ana de Armas, Aaron Burns, Colleen Camp, Ignacia Allamand