Negation occupies a peculiarly privileged position in the depth-psychology corpus, functioning simultaneously as a logical operator, a psychological defence, a metaphysical ground, and an instrument of liberation. The field inherits at least four distinct traditions. From Freud, negation (Verneinung) enters psychology as the intellectual surrogate of repression: to say ‘No’ is to mark what cannot be consciously owned while nonetheless disclosing it. Hillman presses this insight further, locating negation within senex consciousness, where the either/or structure of contradiction freezes opposition into mutual exclusion and names even the unconscious as a negative opponent of ego. Giegerich, working in a Hegelian register, redeploys negation dialectically: the soul’s logical life demands a ‘negation of negation’ — an accomplished, self-cancelling movement that does not settle into simple subversion but raises consciousness to a new logical status through Aufhebung. McGilchrist and the mystical tradition (Eckhart, Kabbalah, Tao Te Ching) offer a cosmogonic reading: negation is the primordial, creative emptying that makes room for Being itself. Indian philosophy, represented by Watts and the Sunyavada, treats negation as the via negativa par excellence, voiding all conceptual grasping. Kalsched adds the clinical dimension: the disavowal or ‘denial of negation’ forecloses mourning and symbol-formation, trapping the subject in traumatic literalism. What unites these registers is a shared intuition that negation is never merely privative but is generative — the productive ‘No’ through which psyche, cosmos, and language articulate themselves.