Sigismund of Austria, Duke, then Archduke of Further Austria (October 26, 1427 – March 4, 1496) is a Habsburg archduke of Austria and ruler of Tirol from 1446 to 1490.

Sigismund (or Siegmund, sometimes also spelled Sigmund) is born in Innsbruck; his parents are Frederick IV, Duke of Austria and Anna of Brunswick.

He is a first cousin of Frederick III, Holy Roman Emperor, who serves as regent until 1446.