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 slasher film directed by Sergio Martino and starring Edwige Fenech, Luigi Pistilli, and Anita Strindberg. The film revolves around a depraved writer and his mistreated wife, whose fragile relationship is further complicated by local murders and the arrival of the writer's beautiful niece.

The film was Martino's fourth giallo. It 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 film's title derives from Martino's earlier The Strange Vice of Mrs. Wardh, in which the titular character (played by Fenech) receives a note containing a similar phrase. The film has been released under several alternative titles, including Gently Before She Dies, Eye of the Black Cat, and Excite Me.