Guardia Marina Zañartu Airport (Spanish: Aeropuerto Guardia Marina Zañartu) (IATA: WPU, ICAO: SCGZ) is an airport serving the town of Puerto Williams on the north shore of Navarino Island in the Magallanes Region of Chile.

The island is at the southern tip of Chile, and is across a narrow strait from Argentina called Beagle Channel.

It is the world's southernmost airport with regular scheduled flights.

The runway is on a small peninsula running parallel to the island's shore, and approaches to either end are partially over the water.

This article about an airport in Chile is a stub.