Cerro Castillo is a hamlet (Spanish: caserío) east of Torres del Paine National Park, and is the head of Torres del Paine commune, in Magallanes Region.
The village is close to the Argentine border. The Chilean customs and immigration offices serving the border crossing (officially known as Rio Don Guillermo) are located in the village.
Coordinates: 51°15′33″S 72°20′42″W / 51.25917°S 72.34500°W / -51.25917; -72.34500