The House of the Prince (Spanish: Casita del Príncipe) is an eighteenth-century building located in El Escorial, Spain. It was designed by the neoclassical architect Juan de Villanueva as the private residence of the heir to the Spanish throne Charles, Prince of Asturias. The word casita is the diminutive of the Spanish word for "house". Such buildings gave their royal occupants the opportunity to escape some of the formalities of court life. The Petit Trianon at Versailles offers a French example of the phenomenon.
Casita del Príncipe (El Pardo): Villanueva designed another building called Casita del Príncipe, for the same royal client. This later building is also in the proximity of a royal palace, that of El Pardo.
Casita del Infante: Villaneuva designed another house in El Escorial, the Casita del Infante, for the Prince's younger brother Gabriel.