Ostanes (from Greek Ὀστάνης), also spelled Hostanes and Osthanes, was the pen-name used by several pseudo-anonymous authors of Greek and Latin works from Hellenistic period onwards. Together with Pseudo-Zoroaster and Pseudo-Hystaspes, Ostanes belongs to the group of pseudepigraphical "Hellenistic Magians", that is, a long line of Greek and other Hellenistic writers who wrote under the name of famous "Magians". While Pseudo-Zoroaster was identified as the "inventor" of astrology, and Pseudo-Hystaspes was stereotyped as an apocalyptic prophet, Ostanes was imagined to be a master sorcerer.