Once - 30 de Diciembre is a station on Line H of the Buenos Aires Underground and is located at the intersection of Pueyrredón and Rivadavia avenues in the neighbourhood of Balvanera. From here, passengers may transfer to the Plaza Miserere station on line A and, through it, transfer to the Once railway station, the central terminal of the Domingo Faustino Sarmiento Railway and Sarmiento Line.

The station was inaugurated on two occasions. The civil engineering was inaugurated 31 May 2007, but the opening for passenger service was held on 18 October 2007. The station was opened as the northern terminus of the inaugural section of the line, with Humberto I, Venezuela, Caseros and Inclán stations. On 6 December 2010 the line was extended to Corrientes.

The Studio of Architects Berdichevsky-Cherny participated In the design of the station.

Once station underground hallways to connect with line A at Plaza Miserere station

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• Plaza Miserere
• Palacio de Aguas Corrientes
• Abasto de Buenos Aires

Media related to Once (Subte de Buenos Aires) at Wikimedia Commons