Trenes de Buenos Aires (TBA) (In English: Trains of Buenos Aires) was a private company that operated commuter rail services over the 5 ft 6 in (1,676 mm) broad gauge Sarmiento and Mitre lines of Buenos Aires. The company, owned by Claudio and Mario Cirigliano, also operated long-distance services on the General Mitre Railway to central-western Argentina and on the General Urquiza Railway to northern Argentina and Uruguay on the international Tren de los Pueblos Libres.

Railway privatisation in Argentina was a process which began in 1989 under the presidency of Carlos Menem, following a series of neoliberal economic reforms. This primarily consisted of breaking up the state-owned railway company Ferrocarriles Argentinos (FA) and allowing the former lines to be operated by private companies instead of the state.