Eli Raphael Roth is an American film director, screenwriter, producer, and actor. As a director and producer, he is most closely associated with the horror genre, namely splatter films, having directed the films Cabin Fever (2002) and Hostel (2005).

Knock Knock is a 2015 thriller film directed by Eli Roth, who also co-wrote the script with Guillermo Amoedo and Nicolás López. The film stars Keanu Reeves, Lorenza Izzo and Ana de Armas. The film was released on October 9, 2015, by Lionsgate Premiere. Knock Knock is a remake of Death Game, which was directed by Peter S. Traynor and starred Sondra Locke and Colleen Camp. All three individuals had a hand in the production of Knock Knock, while Camp also had a cameo in the newer film.