Your Vice Is a Locked Room and Only I Have the Key (Italian: Il tuo vizio è una stanza chiusa e solo io ne ho la chiave) is a 1972 giallo film directed by Sergio Martino. The picture stars Edwige Fenech, Luigi Pistilli, and Anita Strindberg. The film revolves around a depraved writer and his mistreated wife, whose fragile relationship is complicated further after several murders occur nearby, while the author's beautiful niece suddenly comes to visit.

Your Vice Is a Locked Room and Only I Have the Key was Martino's fourth giallo film. The film uses many elements from Edgar Allan Poe's 1843 short story "The Black Cat" and acknowledges this influence in the film's opening credits. The title of the film is a reference to Martino's first one, The Strange Vice of Mrs. Wardh (Lo strano vizio della Signora Wardh, 1971), in which the killer leaves the phrase as a note to his victim. The victim in that film was played by Fenech. The film has been released under several alternate titles, including Gently Before She Dies, Eye of the Black Cat and Excite Me!.