Mansfeld Castle, also known as Burg Mansfeld, is a castle complex in Mansfeld in the Mansfeld-Südharz district in Saxony-Anhalt.
The castle hill bears the ruins of an important fortress as well as the ruins of three castles of the Mansfeld dynasty of counts and the completely preserved Mansfeld Castle Church.
Long before the first documented mention in 1229, a Romanesque fortification existed as the seat of the old Mansfeld dynasty of counts. The name Mansfeld was first mentioned in 973. During excavations, the remains of a keep and a wall in opus spicatum construction were found, which can be dated to the second half of the 11th century. In 1060, a Count Hoyer von Mansfeld is known as the landowner. In 1229, the old dynasty of counts died out with Burchard I and the castle fell into disrepair after his daughters Gertrud and Sophie divided the county; one was married to a burgrave of Neuenburg from the Meinhering dynasty, the other to a burgrave of Querfurt. The son of the second, Count Burchard V of Querfurt, also became Count of Mansfeld in 1260 and took up residence at the castle in 1264. Major repairs are likely to have been carried out at this time. He founded the second line of the Counts of Mansfeld, who were also lords of Schraplau from 1267 to 1412.