Maipú is a census-designated city and commune of Chile located in Santiago Province, Santiago Metropolitan Region, integrated into the Greater Santiago conurbation. It was founded on February 16, 1821 and it is the place of the Battle of Maipú (April 5, 1818), where Chile's independence was consolidated. Inhabitants are mostly part of a young middle class.
According to the 2002 census, Maipú was the second largest commune in Chile, behind Puente Alto. However, the National Statistics Institute estimates that as of 2006, Maipú has surpassed the latter in population.