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The SUBE card (standing for Sistema Único de Boleto Electrónico; literal English translation: Unique Electronic Ticket System) is a contactless smart card system introduced in Argentina in February 2009. It is used on public transport services within the Buenos Aires metropolitan area and other Argentine cities and was promoted by the Argentine Secretary of Transportation. It is valid on a number of different travel systems across the city including the Underground, buses and trains.

One of the benefits of this change is that it has helped speed passengers on to the bus. People no longer had to wait to be issued a printed receipt as they each enter the bus. Environmentally this should help reduce emissions of carbon dioxide and nitrogen because buses don't have to idle as long while passengers load, helping improve air quality in the city. The electronic ticket is eliminating the printed receipts thus lowering the amount of littering in the city. The city, in turn, no longer have to process, collect, count, and transport coinage received in payment of some 11 million trips per day.