How to Kill a Judge (Italian: Perché si uccide un magistrato), also known as The Murder of a Magistrate and Why Does One Kill a Magistrate?, is a 1974 Italian crime-thriller film directed by Damiano Damiani. It is the final chapter in the Damiani's trilogy about mafia, after The Day of the Owl and Confessions of a Police Captain. It was released on DVD by Blue Underground in March 2006.