Ida of Austria (c.1055-September 1101), daughter of Rapoto IV of Cham, also known as Itha, was the wife of Leopold II of Austria, and the mother of Leopold III. She was known as one of the great beauties of her day.

Ida joined the Crusade of 1101, and in September of that year was among those ambushed at Heraclea by the sultan Kilij Arslan I. Ekkehard of Aura reports that Ida was killed in the fighting, but rumors persisted that she survived, and was carried off to a harem. Later legends claimed that she was the mother of the Muslim hero Zengi, but this is quite impossible on chronological grounds.