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Sigismund Korybut (Lithuanian: Žygimantas Kaributaitis; Belarusian: Жыгімонт Карыбутавіч; Polish: Zygmunt Korybutowicz; Czech: Zikmund Korybutovič; Ukrainian: Жиґимонт Корибутович or Сигізмунд Корибутович, c. 1395 – 1435 near Vilkmergė) was a duke from the Korybut dynasty, best known as a military commander of the Hussite army and a governor of Bohemia and Prague during the Hussite Wars.
Sigismund was most likely born in Novhorod-Siverskyi to Dymitr Korybut, son of Algirdas, Grand Duke of Lithuania, and Anastasia, daughter of Grand Prince Oleg of Ryazan, and raised in the court of Korybut's brother (his uncle) Jogaila (Władysław Jagiełło) in Kraków since 1404. Sigismund was rumored to be expected to become his successor on the Polish throne. Being just an adolescent, he commanded his own banner of the Army of the Crown in the victorious Battle of Grunwald in 1410.
His elder sister, Olena (Helena) had been married to an important magnate of Bohemian kingdom, duke Jan of Opava and Ratiborz.