This collection, written by leading Lacanian psychoanalytic theorists and practitioners, is a unique exploration of the novel aspects of perversion from the perspective of cruelty—a psychoanalytic study that has never been sufficiently undertaken in an English-speaking world. Instead of reducing the notion of perversion to cultural representations, a historical discourse or a clinical diagnosis, the authors in this collection draw on Freud, Kant, Hegel, Marquis de Sade, Derrida, Deleuze and Žižek to untie the knot of “psychic cruelty” intrinsic to perversion and therefore “de-sexualize” perverted acts. They do so by theorizing perversion in psychoanalytic concepts of the Oedipus complex, the-Name-of-the-Father and jouissance, and furthermore in the perspective of the clinics of neurosis and psychosis, in dialogue with a clinical praxis, philosophy and literature.