Navarino Island (Spanish: Isla Navarino) is a large Chilean island, with an area of 2,514 km² (971 sq mi) and a coastline of 510 km (320 mi). It is located between Isla Grande de Tierra del Fuego, to the north, and Cape Horn, to the south. The island forms part of the Commune of Cabo de Hornos, the southernmost commune in Chile and in the world, belonging to Antártica Chilena Province in the XII Region of Magallanes and Chilean Antarctica. Its population is concentrated primarily in the communal capital, Puerto Williams, and in small settlements like Puerto Navarino, Río Guanaco and Puerto Toro. The highest point of the island is Pico Navarino at 1,195 m (3,921 ft). The island is a popular destination for fly-fishers.

History and archaeology may be the most valuable resource of Navarino Island and its adjacent sectors.^{[citation needed]} It is considered to have dense concentrations of Yahgan archeological sites in the world. The Yahgan were nomadic people, known for building temporary settlements on a seasonal basis. Their middens show dependency on fishing for food, and on a range of vegetables they gathered.^{[citation needed]}

There is a Megalithic Yaghan archaeological site dating to about 10,000 years ago near Wulaia Bay. Numerous remains of huts surrounded by ring middens have been found on the lowland terraces.

Interest in the Yahgan culture attracts tourists. At the regional museum, the Martin Gusinde Anthropological Museum, exhibits the Yaghan culture: their dwellings, fish traps, and crafts; and the remains of the 19th-century English missions can be seen. Aquatic birds, and the geology and botany of the island, also attract tourists.

The countries disagreed about the sovereign rights over the zone and Snipe, an uninhabitable islet between Picton Island and Navarino Island, claimed by both. Chileans call the waterway around the islet Beagle Channel, but in Argentina they called it Moat channel on the grounds that the Beagle Channel, allegedly, went south around Navarino Island.

The waters around Navarino Island were the location of the Snipe incident between Chile and Argentina in 1958. It was the result of a disputed border line in the Beagle Channel.

In 1971, both countries agreed to British led arbitration to be followed, if necessary, with a binding decision by a panel of five international judges under British auspicices. Arbitration proved unsuccessful and in 1977 judges ruled that the islands belong to Chile. However, in 1978 Argentina rejected the decision and began preparing for military action, Operation Soberanía, bringing the countries to the brink of war. In 1984, after the Argentine defeat in the Falklands war with Britain, and following a national referendum, a new democratic Argentine government signed a treaty with Chile accepting the islands belonged to Chile.

Jacques l'Hermite's fleet were the first Europeans to disembark at the Navarino Island, in 1624. They recorded the native name of the island as Wulla. HMS Beagle visited the island under the command of Phillip Parker King and Robert FitzRoy as part of a survey started in 1829. They named the island after then-recent Battle of Navarino (1827) which was a turning point of the Greek War of Independence against the Ottoman Empire.