Landestrost Castle (German: Schloss Landestrost) is a castle in the Weser renaissance style that was built between 1573-84 in Neustadt am Rübenberge in the north German state of Lower Saxony. Integrated into fortifications, together with the town, it developed into an urban fortress typical of the 16th century. The castle was the representative residence and administrative headquarters of its master, Duke Eric II of Brunswick-Lüneburg.