Simon Louis du Ry (January 13, 1726 in Kassel - August 23, 1799 in Kassel) was a classical architect.
Simon Louis du Ry was the son of the Huguenot architect Charles du Ry and grandson of Paul du Ry of Kassel. He was from a French refugee family, who after the revocation of the Edict of Nantes by Louis XIV had to leave France and went to Hesse under Landgrave Charles. After studying in and educational trips to France and Italy he returned to Kassel, Germany and became chief architect on the court after the death of this father.
Under Frederic of Hesse he was responsible for the transformation of the old and partly destroyed town of Kassel into a modern capital. The Königsplatz (Kings square) and the Friedrichsplatz (Frederics square) remain the main squares in Kassel.
Simon Louis du Ry designed and executed many castles and palaces including: