Princess Elizaveta Ostrogska (1539–1582), also known as Elżbieta or Halshka, was a Ruthenian heiress, the only child of Prince Illia Ostrogski and Beata Kościelecka.

When she was 14, her uncle Konstanty Wasyl Ostrogski (against the will of her mother) made her marry Dymitr Sanguszko, starost of Kaniv, Cherkasy and Zhytomyr.

Soon Dymitr needed to flee because of Infamy and conflict with Sigismund II Augustus I, but he was captured and killed by Marcin Zborowski in the Jaroměř in 1554.

When she became a widow for the third time, her uncle Konstanty Wasyl made her give him and his son Janusz part of her fortune.

There is a legend about one of the Szamotuły castle towers, that it was the prison for a "dark princess", whose face was hidden behind an iron mask by her husband.