Plaza de Maipú is an underground metro station on Line 5 of the Santiago Metro, in Santiago, Chile. The station is located under the Plaza de Armas of Maipú. It was formerly the deepest station in the Santiago Metro system at 28 metres (92 ft) deep. However, this has since been surpassed by the Line 3 platforms at Puente Cal y Canto station. The station was opened on 3 February 2011 as the southwestern terminus of the extension of the line from Pudahuel to Plaza de Maipú.