The Duchess of Swabia was the wife of the Duke of Swabia, ruler of the Duchy of Swabia which existed from 915 to 1313 as part of the Kingdom of Germany.
If the duke was unmarried there was no duchess.
This is a list of holders of the title.
† Not to be confused with Hedwig of Bavaria (c.778 to c.835), wife of Count Welf (died c.825) and mother of Holy Roman Empress Judith of Bavaria (died 843)