Astrampsychus the Magician is a pseudonymous figure of the 2nd century CE to whom works of divination and magic were attributed. He is presented as either a Persian magus or an Egyptian sage, a literary construct designed to lend authority to the texts ascribed to him. His name, suggesting astral or mystical phenomena, and his Persian association reflect the Greco-Roman view of Eastern occult expertise.

The primary works attributed to him are The Oracles of Astrampsychus, a popular numerical lot-oracle for personal questions surviving in Greek manuscripts, and The Oneirocriticon of Astrampsychus, a dream-interpretation manual sometimes associated with him. His significance lies in the reception of his attributed texts. The Oracles of Astrampsychus was a widely used divinatory tool, providing valuable evidence for non-elite beliefs and popular ritual practice in the Roman Empire.

As a pseudonym, "Astrampsychus" functioned as an authoritative brand, similar to Hermes Trismegistus, conferring ancient wisdom upon works of magic and divination.