Madrid ( mə-DRID; Spanish: [maˈðɾið] ) is the capital and most populous municipality of Spain. It has almost 3.4 million inhabitants and a metropolitan area population of approximately 7 million. It is the second-largest city in the European Union (EU), and its monocentric metropolitan area is the second-largest in the EU. The municipality covers 604.3 km2 (233.3 sq mi) geographical area. Madrid lies on the River Manzanares in the central part of the Iberian Peninsula at about 650 meters above mean sea level. The capital city of both Spain and the surrounding autonomous community of Madrid (since 1983),: 44  it is also the political, economic, and cultural centre of the country. The climate of Madrid features hot summers and cool winters. The primitive core of Madrid, a walled military outpost, dates back to the late 9th century, under the Emirate of Córdoba. Conquered by Christians in 1083 or 1085, it consolidated in the Late Middle Ages as a sizeable town of the Crown of Castile. The development of Madrid as administrative centre fostered after 1561, as it became the permanent seat of the court of the Hispanic Monarchy.

The Madrid urban agglomeration has the fourth-largest GDP

in the European Union and its influence in politics, education, entertainment, environment, media, fashion, science, culture, and the arts all contribute to its status as one of the world's major global cities. Madrid is considered the major financial centre and the leading economic hub of the Iberian Peninsula and of Southern Europe. The metropolitan area hosts major Spanish companies such as Telefónica, Iberia, BBVA and FCC.: 45  It concentrates the bulk of banking operations in the country and it is the Spanish-speaking city generating the largest number of webpages.: 45 

Madrid houses the headquarters of the UN's World Tourism Organization (UNWTO), the Ibero-American General Secretariat (SEGIB), the Organization of Ibero-American States (OEI), and the Public Interest Oversight Board (PIOB). It also hosts major international regulators and promoters of the Spanish language: the Standing Committee of the Association of Spanish Language Academies, headquarters of the Royal Spanish Academy (RAE), the Instituto Cervantes and the Foundation of Urgent Spanish (FundéuRAE). Madrid organises fairs such as FITUR, ARCO, SIMO TCI and the Madrid Fashion Week. Madrid is home to two world-famous football clubs, Real Madrid and Atlético Madrid.

While Madrid possesses modern infrastructure, it has preserved the look and feel of many of its historic neighbourhoods and streets. Its landmarks include the Plaza Mayor, the Royal Palace of Madrid; the Royal Theatre with its restored 1850 Opera House; the Buen Retiro Park, founded in 1631; the 19th-century National Library building (founded in 1712) containing some of Spain's historical archives; many national museums, and the Golden Triangle of Art, located along the Paseo del Prado and comprising three art museums: Prado Museum, the Reina Sofía Museum, a museum of modern art, and the Thyssen-Bornemisza Museum, which complements the holdings of the other two museums. The mayor is José Luis Martínez-Almeida from the People's Party.