Punta Médanos Lighthouse, Maritime navigation lighthouse in La Costa Partido, Argentina

Punta Médanos Lighthouse is a 59-meter metal tower with a truncated-pyramid shape and three legs, topped by a gallery and a large lantern with a red dome. The tower is painted in horizontal red and white bands, and a service building sits beneath the gallery. A house stands at its base.

The lighthouse was prefabricated in France in 1890 by Barbier, Bénard et Turenne, shipped in 1891 and assembled on site, entering service on 9 July 1893. It was declared a national historical monument on 10 November 2010.

The lighthouse takes its name from Punta Médanos, a cape Magellan's expedition sighted on 7 February 1520 and named Cabo Santa Polonia; the name later shifted to the cape's present position. Its red and white bands make it a landmark for sailors and for travellers on Route 11 between Mar de Ajó and Pinamar.

The tower is not open to visitors, but historical exhibits at its base can be seen from Friday to Sunday. The lighthouse stands off Route 11, roughly midway between Mar de Ajó and Pinamar, about 15 km north of Punta Médanos and 500 m from the high-tide line.

This lighthouse was built using cast iron at a height and scale rarely seen in South American lighthouses of that era, making it an unusual engineering choice. The material allowed the structure to endure coastal weather for over a century with minimal structural damage.