Princess Stéphanie of Windisch-Graetz (April 4, 1909 in Ploskovice, Bohemia – May 29, 2005 in Uccle, Belgium) was the daughter of Prince Otto Weriand of Windisch-Graetz (1873–1952) and Archduchess Elisabeth Marie of Austria (1883–1963), only child of Crown Prince Rudolf of Austria and Princess Stéphanie of Belgium.
She was the great-grandchild of Emperor Franz-Joseph and Empress Elisabeth ('Sissi') of Austria.
She was also the great-grandchild of King Leopold II of Belgium.
Her full name was Stéphanie Eleonore Maria Elisabeth Kamilla Philomena Veronika zu Windisch-Grätz in German, and Stéphanie Éléonore Marie Élisabeth Camille Philomène Véronique de Windisch-Grätz in French.
She may have been named after her maternal grandmother, Princess Stéphanie of Belgium.