William of Brunswick may refer to: William of Winchester, Lord of Lüneburg (1184–1213) William I, Duke of Brunswick-Lüneburg (c. 1270–1292) William II, Duke of Brunswick-Lüneburg (1300–1369) William the Victorious, Duke of Brunswick-Lüneburg (c. 1392–1482) William IV, Duke of Brunswick-Lüneburg (c. 1425–1503) William the Younger, Duke of Brunswick-Lüneburg (1535–1592) William, Duke of Brunswick-Grubenhagen (c. 1298–1360) William Augustus, Duke of Brunswick-Harburg (1564–1642) Augustus William, Duke of Brunswick-Wolfenbüttel (1662–1731) August Wilhelm, Duke of Brunswick-Bevern (1715–1781) Charles William Ferdinand, Duke of Brunswick-Wolfenbüttel (1735–1806) Frederick William, Duke of Brunswick-Wolfenbüttel (1771–1815) William, Duke of Brunswick (1806–1884)