William of Jülich (died 1304) was a Flemish political leader.
William of Jülich may refer to:
(died 1176) (died 1207) William III, Count of Jülich (died 1219) William IV, Count of Jülich (died 1278) William I, Duke of Jülich (died 1361), count of Jülich as William V William II, Duke of Jülich (died 1393) William I of Guelders and Jülich (1364-1402), duke of Jülich as William III William IV, Duke of Jülich-Berg (died 1511) William, Duke of Jülich-Cleves-Berg (1516-1592), duke of Jülich as William V, nicknamed "the Rich"