Retiro is a barrio (district) in Buenos Aires, Argentina. Located in the northeast end of the city, Retiro is bordered on the south by the Puerto Madero and San Nicolás barrios, and on the west by the Recoleta barrio.
Retiro is one of the largest hubs of transportation services in Argentina, and is home to many high-end stores and residential areas popular among both local wealthy gentry and expatriate executives. About 26,000 of its people, however, including thousands of illegal immigrants, live in the "Villa 31" shantytown built along the Port of Buenos Aires from the 1930s onwards. Local and long distance rail service heading to the north originate from Estación Retiro (Retiro train terminal), also a major long-distance bus terminal (Terminal de Ómnibus) is located adjacent to the station, subte line C of the Buenos Aires Metro system and numerous local public bus services, this area is always teeming with commuters and traffic on weekdays.
A major thoroughfare is Avenida del Libertador, which becomes Avenida Leandro N. Alem past the Retiro train terminal. Avenida Leandro Alem runs north-to-south along the Buenos Aires Central Business District, which Retiro shares with the San Nicolás ward; the Retiro section of the business district is centered around the Catalinas Norte office park, initially built in the 1970s over docklands developed a century earlier by Francisco Seeber. Other principal streets and avenues in Retiro are Santa Fe, Córdoba, and Libertador Avenues, pedestrian Florida Street, and Avenida 9 de Julio.