Princess Stephanie of Windisch-Graetz (9 July 1909 in Ploskovice, Bohemia – 7 September 2005 in Uccle, Belgium) was the daughter of Archduchess Elisabeth Marie of Austria (1883–1963), only child of Crown Prince Rudolf of Austria and Princess Stéphanie of Belgium, and Prince Otto Weriand of Windisch-Graetz (1873–1952).

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.

Her mother came to live in Brussels with the four children and Princess Clementine of Belgium offered a friendly refuge to Stéphanie.

In 1921, Archduchess Elisabeth had begun a relationship with the Austrian socialist member of parliament Leopold Petznek, whom she eventually married in 1948.

She had one child by her second husband: During her long life, Stéphanie traveled extensively, especially in Africa, where her brother François-Joseph lived in Kenya, and also in South America, particularly in Argentina.