The Retiro Park or Parque del Buen Retiro, popularly known as the Retiro, is a historic garden and public park located in Madrid.

Considered one of the main tourist attractions of the city, it houses numerous architectural, sculptural and landscape ensembles from the 17th to 21st centuries, among which the Monument to Alfonso XII, the Crystal Palace, the Big Pond, the Parterre, the Puerta de Felipe IV, the Royal Astronomical Observatory and the source of the Artichoke; and even earlier, such as the hermitage of San Pelayo and San Isidoro, of Romanesque origin.

It was built in the first half of the seventeenth century as part of the landscaping project developed for the Buen Retiro Palace, an old royal possession created by the Count-Duke of Olivares for the enjoyment of Felipe IV, of whom it was his patron.

Its use as an urban park dates back to 1767, the year in which Carlos III allowed the public to enter for recreational purposes and, definitely, from 1868, when it came under the ownership of the Madrid City Council.

Due to the damage caused by the War of Independence (1808-1814), its current appearance is the result of the interventions carried out in the 19th and 20th centuries, although original designs and elements from the 17th and 18th centuries survive.

With an area of 118 hectares and a perimeter of 4 km, it administratively belongs to the Retiro district, named after the park.

It is delimited to the north by the streets of Alcalá and O'Donnell, to the south by that of the poet Esteban Villegas, to the west by that of Alfonso XII and to the east by Avenida de Menéndez Pelayo.

Within its limits there are more than 19,000 trees, representative of 167 species, including six specimens included in the list of unique trees in the Community of Madrid.