Schloss Johannisburg is a schloss in the town of Aschaffenburg, in Franconia, in the state of Bavaria, Germany. It was erected between 1605 and 1614 by the architect Georg Ridinger for Johann Schweikhard von Kronberg, Prince Bishop of Mainz. Until 1803, it was the second residence of the Archbishop and Prince Elector of Mainz. It is constructed of red sandstone, the typical building material of the Spessart, the hills near Aschaffenburg.