The Royal Site of San Lorenzo de El Escorial, commonly known as El Escorial, is a historical residence of the King of Spain, in the town of San Lorenzo de El Escorial, about 45 kilometres northwest of the capital, Madrid, in Spain. It is one of the Spanish royal sites and has functioned as a monastery, basilica, royal palace, pantheon, library, museum, university, school and hospital. It is situated 2.06 km up the valley from the town of El Escorial.
El Escorial comprises two architectural complexes of great historical and cultural significance: the royal monastery itself and La Granjilla de La Fresneda, a royal hunting lodge and monastic retreat about five kilometres away. These sites have a dual nature; that is to say, during the 16th and 17th centuries, they were places in which the power of the Spanish monarchy and the ecclesiastical predominance of the Roman Catholic religion in Spain found a common architectural manifestation. El Escorial was, at once, a monastery and a Spanish royal palace. Originally a property of the Hieronymite monks, it is now a monastery of the Order of Saint Augustine. It is also a boarding school.