Mysticism and esotericism are two intimately related strands of the Western tradition. Despite their close connections, however, scholars tend to treat them separately. Whereas the study of Western mysticism enjoys a long and established history, Western esotericism is a young field. The Cambridge Handbook of Western Mysticism and Esotericism examines both of these traditions together. The volume demonstrates that the roots of esotericism almost always lead back to mystical traditions, while the work of mystics was bound up with esoteric or occult preoccupations. It also shows why mysticism and esotericism must be examined together if either is to be understood fully. Including contributions by leading scholars, this volume features essays on such topics as alchemy, astrology, magic, Neoplatonism, Kabbalism, Renaissance Hermetism, Freemasonry, Rosicrucianism, numerology, Christian theosophy, spiritualism, and much more. This Handbook serves as both a capstone of contemporary scholarship and a cornerstone of future research.