The term ‘Being’ traverses the depth-psychology corpus as one of its most contested and foundational axes, extending far beyond any single discipline into ontology, phenomenology, mystical philosophy, and linguistic theory. Heidegger’s Being and Time furnishes the dominant modern treatment: Being is not an entity but the condition of possibility for all entities, and Dasein is the being for whom its own Being is an issue — the inquiry into Being is thus simultaneously an inquiry into the structure of human existence, temporality, and care. Plotinus offers a rival and complementary tradition in which Being is identified with the Intellectual Principle, possesses eternal stability, and is coextensive with Intellect, yet remains subordinate to the One that transcends Being altogether. Plato’s Parmenides and Sophist introduce the ancient aporia: if the One is, what is the character of its Being? — and the Sophist’s discovery that Not-being is the principle of otherness running through all things remains a touchstone for every subsequent discussion. Against these metaphysical traditions, Derrida exposes how ‘Being’ is entangled with grammatical and linguistic operations — the copula, the third-person singular of ‘is’ — revealing that ontological categories may be projections of particular linguistic states. Simondon subordinates Being to individuation, insisting that the theory of phases of being must precede ontology proper. Henry Corbin, as cited by Miller, marks the confusing of Being with a supreme being as ‘the metaphysical catastrophe.’ Together these voices chart a field of irreducible tension between Being as ground, Being as event, and Being as grammatical artifact.