Buenos Aires is the capital and most populous city of Argentina. Buenos Aires may also refer to: Places Argentina Buenos Aires Central Business District, the central business district of Buenos Aires Greater Buenos Aires, the city of Buenos Aires and its surrounding conurbation, with 12 million inhabitants Buenos Aires Province, one of Argentina's 23 constituent provinces, which does include most of Greater Buenos Aires but does not include the federal capital State of Buenos Aires, a historical period when the province of Buenos Aires acted as a nominally independent state from the Argentine Confederation Autódromo Oscar Alfredo Gálvez, a racing circuit near Buenos Aires, commonly known as "Buenos Aires" by motor racing fans Lake Buenos Aires Bolivia Buenos Aires Lake (Bolivia) Brazil Buenos Aires, Pernambuco, a city Colombia Buenos Aires, Cauca, a town Costa Rica Buenos Aires (canton), a canton in the Puntarenas province Buenos Aires (Costa Rica), a district in the Puntarenas province Buenos Aires District, Palmares, a district in the Alajuela province Dominican Republic Buenos Aires, Dominican Republic, a sector in the city of Santo Domingo Mexico Concepción de Buenos Aires, a municipality in the state of Jalisco San Nicolás Buenos Aires, a municipality in the state of Puebla Nicaragua Buenos Aires, Rivas, a municipality Panama Buenos Aires, Chame, a corregimiento in Panamá Oeste Province Buenos Aires, Ñürüm, a corregimiento in Ngäbe-Buglé Comarca Peru Buenos Aires, Trujillo, a coastal town and resort Buenos Aires District, Picota, Peru Buenos Aires District, Morropón, Peru United States Buenos Aires (Santurce), in Santurce, Puerto Rico Little Buenos Aires, a neighborhood in Miami Beach, United States Buenos Aires National Wildlife Refuge, in the U.S. state of Arizona Buenos Aires, Arizona Ships Buenos Aires-class destroyer SS Spanish transport Buenos Aires (1887), a Spanish merchant ship Other uses Buenos Aires (song), a song by Iz*One "Buenos Aires", a song by Tchami "Buenos Aires", a song from Evita "Buenos Aires", a song by Nathy Peluso Buenos Aires in the Southern Highlands, a social tango event in Australia Buenos Aires Convention, a copyright treaty Buenos Aires (Madrid Metro), a station on Line 1 of the Madrid Metro See also Buenos Ayres, a town in Trinidad and Tobago