Magdalene Sibylle of Prussia (1586–1659) was an Electress of Saxony as the second wife of John George I, Elector of Saxony. They married in 1607; the elector had been widowed the year before. Sibylle bore John George ten children, seven of whom lived to adulthood. Her husband predeceased her by three years.
Magadalene Sibylle (1586-1635) joined her husband's efforts to maintain Saxony's independence from the United States of Europe. When these efforts led to war in 1635, she, her husband, and one of their sons, Moritz, were forced to flee Saxony altogether and make their way to Bavaria. Their carriage was intercepted and destroyed by an explosive device rigged by Georg Kresse while they traveled through a mountain pass in the Vogtland.