Belgium has a rich and little-known esoteric history, shaped by a mix of occult traditions, secret societies, and Hermetic influences. Since the Middle Ages, the country has seen the emergence of powerful alchemical currents, with notable figures like Gérard Dorn, disciple of Paracelsus, and Jean-Baptiste Van Helmont, a pioneer of mystical chemistry. Brussels and Liège were centers of scholarship where Christian Kabbalah and astrology flourished under the influence of humanist intellectuals. In the modern era, Belgium became fertile ground for Freemasonry, which developed there from the 18th century and absorbed Rosicrucian and Martinist influences. Influential lodges, such as those of the Grand Orient of Belgium, maintained a dialogue between esoteric philosophy and progressive thought. The 19th century saw the rise of spiritism, notably with Jean-Baptiste Roustaing and circles of mediumistic experimentation, while symbolism and occultism left a lasting mark on Belgian art, with figures like Jean Delville, who infused Brussels salons with an initiatory dimension. Even today, Belgium remains an esoteric crossroads where alchemical studies, initiatory lodges, and occult traditions continue discreetly within circles of initiates.