Madrid is the capital city of Spain, and the largest municipality in the Community of Madrid. The city has a population of almost 3.2 million with approximately 6.5 million. It is the third-largest city in the European Union, after London and Berlin, and its metropolitan area is the third-largest in the European Union after London and Paris. The municipality itself covers an area of 604.3 km². Madrid houses the headquarters of the World Tourism Organization (UNWTO), belonging to the United Nations Organization (UN), the Ibero-American General Secretariat (SEGIB), the Organization of Ibero-American States (OEI), and the Public Interest Oversight Board (PIOB).

Its landmarks include 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; a large number of 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 completes the shortcomings of the other two museums. Cibeles Palace and Fountain have become one of the monument symbols of the city.

Madrid is home to two world-famous football clubs, Real Madrid and Atlético de Madrid. Due to its economic output, high standard of living, and market size, Madrid is considered the major financial centre of Southern Europe and the Iberian Peninsula; it hosts the head offices of the vast majority of major Spanish companies, such as Telefónica, Iberia, and Repsol. Madrid is the 17th most liveable city in the world according to Monocle magazine.