Halberg Castle is a German castle built between 1877 and 1880 on Halberg mountain near Saarbrücken. The castle is located in the area of the former municipality of Brebach, which was merged with Fechingen to form Brebach-Fechingen in 1959 and incorporated into Saarbrücken in 1974. The castle complex, which was designed by the architects Edwin Oppler and Ferdinand Schorbach for Carl Ferdinand von Stumm-Halberg, is the second largest neo-Gothic secular building in Saarland after the St. Johann Town Hall despite renovations and partial demolition after World War II.