The burgstall of Dietrichstein Castle, also called the Diederichstein Ruins (Ruine Diederichstein), is the site of an old, probably high mediaeval, aristocratic, castle, situated high above the valley of the River Trubach in the municipality of Pretzfeld in the Upper Franconian county of Forchheim in Bavaria, Germany.
The burgstall is freely accessible at all times and is used today as a viewing point.