Ego Entropy Suppression designates the mechanism by which the ego-organization — understood as a relatively stable, high-level regulatory structure — actively constrains the entropic, unconstrained flow of psychic and neural process that characterizes primary states of consciousness. The term receives its most explicit neurodynamic formulation in Carhart-Harris’s entropic brain hypothesis, where entropy suppression is cast as the defining operation of normal waking consciousness: the brain functions just below criticality, and the ego apparatus is the principal instrument of that sub-critical constraint, furnishing reality-testing, metacognition, and self-awareness. This formulation finds deep resonances, if not identical language, throughout the depth-psychology corpus. Freud’s structural theory implies an ego whose negating and repressive functions constitute precisely such a suppressive regime. Neumann extends this into an ethics of repression and suppression, arguing that the ego’s identification with collective values systematically excludes shadow contents, generating psychic costs commensurate with the severity of the constraint. Hillman reads the senex-dominated ego as a petrifying, entropy-suppressing formation that purchases order at the cost of vitality. The convergence of these traditions — clinical-psychoanalytic, analytical-psychological, and cognitive-neurodynamic — reveals that ego entropy suppression is not merely a neuroscientific metaphor but a structural principle debated across a century of depth-psychological inquiry, with persistent tension between its adaptive value and its pathological potential.