The Intellectual Realm — variously designated as the Intellectual Kosmos, the Intelligible Sphere, or the Noetic World — occupies a privileged structural position across multiple traditions represented in the depth-psychology corpus. In Plotinus, whose Enneads provide the corpus’s most sustained treatment, the Intellectual Realm is neither an abstract logical domain nor a spatially delimited place, but the living, self-contemplating totality of Authentic Being in which Intellect, its objects, and Real Existence form a single luminous unity. The tension that animates Plotinus’s account is between the Intellectual Realm as a self-sufficient plenum — complete, eternal, without novelty or movement — and its necessary downward expression through Soul into temporal existence. Corbin’s scholarship on Ibn Arabi introduces a cognate but distinct modality: a hierarchy of worlds in which the Intellectual Realm is surrounded above and below by the Divine Presence and the imaginal ‘alam al-mithal, complicating any simple two-tier Platonism. Von Franz bridges these traditions psychologically, reading the intermediary ‘imaginal-psychoid realm’ between Platonic ideas and coarse matter as the locus where archetypal contents acquire ordering efficacy. For Aurobindo, the intellectual sphere is a derivative, not a primal, level of cosmic consciousness, subordinate to the supramental. The Intellectual Realm thus functions as a contested border-zone: sublime yet secondary, necessary yet insufficient.