I Know That You Know That I Know (Italian: Io so che tu sai che io so) is a 1982 Italian comedy-drama film directed by Alberto Sordi, who is also the co-protagonist with the Italian actress Monica Vitti. It was entered into the 13th Moscow International Film Festival where it won a Special Prize. The film's sets were designed by the art directors Lorenzo Baraldi and Massimo Tavazzi. It was shot on location around Rome.