Instinct occupies a contested and generative position across the depth-psychology corpus, functioning simultaneously as a biological given, a psychic structuring force, and a domain of potential pathology when denied or injured. Freud established the foundational frame: instinct stands on the frontier between the somatic and the psychic, a measure of demand made upon the mind for work, differentiated not by intrinsic quality but by source and aim. Jung inherited this problematic and substantially complicated it. For Jung, instinct is not merely a compulsive biological drive but a pattern-forming agency whose ‘partie supérieure’ can achieve spiritual expression; the archetype, famously, is the instinct’s perception of itself. He enumerated five instinctual groups—hunger, sexuality, activity, reflection, and creativity—the last being distinctively human. Hillman, drawing on Jung, situates instinct and fantasy image on a single spectrum, resisting Freud’s sublimation model. Levine foregrounds survival instincts as the evolutionary substrate of consciousness, arguing that their dissociation underlies trauma. Estés treats injury to basic instinct as a clinical category with cultural and spiritual dimensions. McGilchrist and Hogenson each press the question of instinct’s relationship to innate knowledge and archetypal patterning. Klein anchors instinct in Freud’s life-and-death polarity. Across the corpus the central tension remains: whether instinct is the bedrock upon which psyche builds, or whether psyche transforms instinct into something categorically new.