Sigismund I

Sigismund I may refer to:


 * Sigismund of Burgundy (died 524), King of the Burgundians
 * Sigismund I, Prince of Anhalt-Dessau (died 1405)
 * Sigismund, Holy Roman Emperor (1368–1437)
 * Sigismund I of Lithuania (c. 1365 – 1440)
 * Sigismund, Archduke of Austria (1427–1496)
 * Sigismund of Bavaria (1439–1501), Duke of Bavaria
 * Sigismund I the Old (1467–1548), King of Poland and Grand Duke of Lithuania