The Palacio de los Castejones is a plateresque 16th-century palace located in Soria, Spain. It is located at the Aduana Vieja street next to other renaissance palaces of the city. It was built by the Castejón family, which is of great weight in this region of Castile. In the nearby village of Agreda, there is another palace called Palacio de los Castejón.