Magic in the Graeco-Roman world is a disputed concept among modern historians, whose interpretation has changed significantly over the last 200 years of study. In studying it we may either focus on terms from ancient languages translatable as “magic,” or examine materials and practices that may be classified as “magic” according to modern definitions. Ancient terminology centers around terms such as the Greek word mageia, and its Latin cognate magia, referring to superhuman practices that often involved the manipulation of the natural and divine worlds through secret knowledge and ritual. Objects identified by modern scholars as magical include curse tablets, written objects intended to injure, bind, or render harmless their victims, magical handbooks written on papyrus, providing instructions for rituals, and amulets, often in the form of semiprecious stones inscribed with images of deities and short texts. While some of these practices are reflected in ancient literary sources discussing magic, literary texts also show an exaggerated discourse, in which magic-users may be stereotyped according to their ethnicity (exotic magicians from Egypt, Syria, or Judaea) or gender (lurid images of witches), and practices are depicted as fantastical and extreme, involving acts such as human sacrifice. Popular images of magic and actual practice come together in laws and regulations against magic and its users, primarily from the period of the Roman Empire. These may be in the form of imperial law, or else Christian and non-Christian cultic rules, which prescribe social exclusion or even death, so that accusations of magic could be a potent tool in social conflicts.