Schloss Johannisberg is a castle and winery in the village of Johannisberg to the west of Wiesbaden, Hesse, in the Rheingau wine-growing region of Germany. It has been making wine for over 900 years. The winery is most noted for its claim to have "discovered" late harvest wine. The castle is a venue of the Rheingau Musik Festival, made available by co-founder Tatiana von Metternich-Winneburg.