Buenos Aires ( or , ) is the capital and largest city of Argentina, and the second-largest metropolitan area in South America. It is located on the western shore of the estuary of the Río de la Plata, on the continent's southeastern coast. The Greater Buenos Aires conurbation, which also includes several Buenos Aires Province districts, constitutes the third-largest conurbation in Latin America, with a population of around fifteen and a half million.

Buenos Aires, denominada legalmente Ciudad de Buenos Aires o Ciudad Autónoma de Buenos Aires, es la capital de la República Argentina y el principal núcleo urbano del país. Está situada en la región centro-este del país, sobre la orilla occidental del Río de la Plata, en la llanura pampeana.