Buin is a city and commune of Chile, in the Maipo Province, Metropolitan Region of Santiago, which forms part of Greater Santiago. It is a city composed of the towns of Maipo, Viluco, Linderos, Valdivia de Paine, Alto Jahuel, Los Guindos and El Recurso. Buin is located about 35 km (22 mi) south of Santiago in the Maipo Valley wine region.