Zoroaster — the Iranian prophet and founder of Mazdaism, known in his own tradition as Zarathustra — enters the depth-psychology corpus along two principal axes. The first is mythological-comparative: Joseph Campbell treats Zoroaster as a pivotal figure in the history of dualistic cosmology, charting how the prophet’s vision of a universe bifurcated between Ahura Mazda and Angra Mainyu generated the cosmic-historical framework — twelve millennia of conflict culminating in the Saoshyant — that would profoundly shape Gnostic, Jewish apocalyptic, and early Christian thought. Campbell reads Zoroaster’s birth as the decisive eschatological turning point built into the myth’s own structure. The second axis is depth-psychological: Jung, in his Zarathustra seminars, treats the historical Zoroaster as the archetypal substrate that Nietzsche unconsciously appropriated, arguing that Nietzsche’s Zarathustra recapitulates — and dangerously inflates — the profile of the ancient prophet: monotheistic reformer, opponent of magic, inaugurator of moral dualism, ultimately absorbed into the archetype of the Wise Old Man. Hans Jonas situates Iranian dualism as one of the three foundational forces shaping the Hellenistic religious world, making Zoroastrianism structurally central to any genealogy of Gnosticism. Henry Corbin, meanwhile, places Zoroaster within Suhrawardi’s theosophy of light, where the prophet anchors an Ishraqiyya lineage of illuminationist wisdom. Taken together, these treatments reveal Zoroaster as an irreducible node at the intersection of eschatology, moral dualism, prophetic psychology, and the history of Light-metaphysics.