Constance of Austria (German: Konstanza; Polish: Konstancja; Lithuanian: Konstancija; 24 December 1588 – 10 July 1631) was Queen of Poland and Grand Duchess of Lithuania as the second wife of King-Grand Duke Sigismund III Vasa and the mother of King John II Casimir.

[1][2] Constance was a daughter of Charles II of Austria and his niece, Maria Anna of Bavaria.

Her paternal grandparents were Ferdinand I, Holy Roman Emperor and Anna of Bohemia and Hungary (1503–1547).

She represented the interests of the Habsburg family in Poland, and influenced the appointments of positions in the court, government and church.

In 1623 Constance bought Żywiec from Mikołaj Komorowski, which was forbidden by law to the members of the royal family and caused misunderstandings with the Parliament.