Dürnstein is a town in the Wachau Valley in Krems-Land, Austria.
Dürnstein was first mentioned in 1192, when, in the castle above the town, King Richard I Lionheart of England was held captive by Duke Leopold V of Austria after their dispute during the Third Crusade.
Richard had personally offended Leopold by casting down his standard from the walls at the Battle of Acre, and the duke suspected that King Richard ordered the murder of his cousin Conrad of Montferrat in Jerusalem.
In consequence Pope Celestine III excommunicated Leopold for capturing a fellow crusader. The duke finally gave the custody of Richard to Emperor Henry VI, who imprisoned Richard at Trifels Castle.
Durnstein Castle was almost completely destroyed by the troops of the Swedish Empire under Field Marshal Lennart Torstenson in 1645.
Dürnstein Abbey was established in 1410 by Canons Regular from Třeboň and from 1710 rebuilt in a Baroque style according to plans by Joseph Munggenast, Jakob Prandtauer and Matthias Steinl. The monastery was dissolved by order of Emperor Joseph II in 1788 and fell to the Herzogenburg Priory.
During the War of the Third Coalition the Battle of Dürenstein was fought nearby on November 11, 1805.