Trenes de Buenos Aires (TBA) (In English: Trains of Buenos Aires) is a privately-owned company which, on 27 May 1995, took over the concession, granted by the Argentine government as part of railway privatisation during the presidency of Carlos Menem, for the operation of commuter rail services in Buenos Aires, Argentina over the 5 ft 6 in (1,676 mm) broad gauge Sarmiento Line and Mitre Line.
The company also forms part of the consortium Unidad de Gestión Operativa Ferroviaria de Emergencia (UGOFE) which operates other commuter rail services in Buenos Aires.
In addition to the commuter rail services on Sarmiento and Mitre Line, TBA also runs daily long-distance passenger trains from Estación Retiro to the cities of Rosario, Santa Fe, and points between, in northern Argentina. Including all its commuter and long-distance services, the company runs approximately 1,000 trains per day and conveys about 147.7 million passengers annually, or 500,000 daily.
Since 2004 the company also forms part of UGOFE, a consortium with Metrovías and Ferrovías, which took over the running of commuter rail services on Belgrano Sur Line, Roca Line and San Martín Line in Buenos Aires after concessions granted to Metropolitano S.A. for the operation of these services were revoked.