The term ‘oracle’ occupies a rich and contested space in the depth-psychology corpus, drawing together classical scholarship, Jungian synchronicity theory, and comparative religion. Three principal registers emerge. First, the phenomenology of Greek oracular practice: Jaynes traces a six-stage ‘decadence’ from raw bicameral voice to scripted textual pronouncement, while Rohde documents the Delphic oracle’s mediating authority over hero-cult and purification rites, and Burkert anatomizes the material apparatus — incubation chambers, labyrinths, hallucinogens — that sustained oracular experience at sites such as Trophonios and the Nekyomanteion. Detienne’s account of the Trophonius oracle foregrounds the ritual drama of memory and forgetting (Lethe and Mnemosyne) that frames oracular descent. Second, the I Ching as oracle: Wilhelm, Ritsema-Karcher, and Jung treat the yarrow-stalk procedure as a legitimate oracular system grounded not in theistic audition but in synchronicity and the self-organization of psychic strata inaccessible to consciousness. Jung’s Bollingen experiments with the text and his collaboration with Richard Wilhelm make the I Ching the paradigmatic ‘oracle book’ for analytical psychology. Third, the prophetic-mantic dimension: Otto links Dionysian prophecy to sacred madness, while Beekes traces the Greek verbal root that distinguishes consulting an oracle from delivering one. Taken together, these positions frame the oracle as a site where collective unconscious contents become audible — whether through inspired priestess, ritual descent, or stochastic chance.