Complete Unknown is a 2016 American-British drama mystery thriller film, directed by Joshua Marston, from a screenplay by Marston and Julian Sheppard. It stars Rachel Weisz, Michael Shannon, Kathy Bates and Danny Glover. It had its world premiere at the Sundance Film Festival on January 25, 2016. The film was released on August 26, 2016, by Amazon Studios and IFC Films.