Buenos Aires Underground

The Buenos Aires Underground (Spanish: Subterráneo de Buenos Aires), locally known as Subte ( Spanish: [ˈsuβte]), is a rapid transit system that serves the area of the city of Buenos Aires, Argentina. The first section of this network (Plaza de Mayo–Plaza Miserere) opened in 1913, making it the 13th earliest subway network in the world and the first underground railway in Latin America, the Southern Hemisphere, and the Spanish-speaking world, with the Madrid Metro opening nearly six years later, in 1919. As of 2025, Buenos Aires is the only Argentine city with a metro system.

Currently, the underground network's six lines—A, B, C, D, E, and H—comprise 56.7 kilometers (35.2 mi) of routes that serve 90 stations. The network is complemented by the 7.4-kilometre-long (4.6 mi) Line P, an 18 station premetro line. Traffic on subterranean lines moves on the left because Argentina drove on the left at the time the system opened. Over a million passengers use the network, which also provides connections with the city's extensive commuter rail and bus rapid transport networks.