The Residential Palace Darmstadt is the former residence and administrative seat of the landgraves of Hesse-Darmstadt and from 1806 to 1919 of the Grand Dukes of Hesse-Darmstadt. It is located in the centre of the city of Darmstadt. The palace consists of an older Renaissance part and an 18th century Baroque part. As of 2023, the castle is the seat of the Technische Universität Darmstadt and the German-Polish Institute.