Uncanniness — the German Unheimlichkeit, literally ‘not-at-home-ness’ — occupies a decisive position in the depth-psychological corpus, functioning simultaneously as an ontological, phenomenological, and psychodynamic category. Heidegger furnishes the most systematic treatment: in Being and Time, uncanniness names the primordial condition of thrownness in which Dasein, stripped of its everyday absorption in the ‘they,’ confronts the nullity of its ground. Anxiety is its vehicle, and the ‘call of conscience’ its occasion; uncanniness thus becomes the very disclosure-structure of authentic selfhood. Rudolf Otto traces a cognate phenomenon in the religious domain, locating in the ‘feeling of something uncanny’ the germinal form of numinous dread from which all daemonic and divine representation grows — a thesis that situates uncanniness at the origin of religious history itself. Erich Neumann extends the concept into depth psychology proper, reading the uncanniness of neurotic and psychotic manifestation as the triumph of the unconscious over ego-consciousness. Walter F. Otto and Irvin Yalom invoke the term, respectively, to characterise virginal nature’s irreducible strangeness and the existential groundlessness encountered in desert-place experiences. Across these registers, uncanniness is never mere aesthetic eeriness but a threshold phenomenon: the point at which familiar world-structures collapse and the being of existence presses forward undisguised.