Archipiélago de Juan Fernández National Park (Spanish pronunciation: [ˈxwaɱ feɾˈnandes]) is a national park located in the Pacific Ocean 665 kilometres west of Chile's mainland port of San Antonio, in the Juan Fernández Archipelago.

The volcanic origin and remote location of the islands isolate them from the flora and fauna species of continental South America.

Alejandro Selkirk Island is mostly covered with grassland from 0 to 400 m (1,300 ft), interspersed with wooded ravines (quebradas), home to dry forests of Myrceugenia and Zanthoxylum fagara.

The treeline is at approximately 950 m (3,100 ft), above which is alpine shrubland and grassland, dominated by temperate Magellanic vegetation such as Acaena, Dicksonia, Drimys, Empetrum, Gunnera, Myrteola, Pernettya, and Ugni.

One of the main predators of endemic vegetable species, and responsible for the great extensions of grassland, is the Juan Fernández Goat.

CONAF carries out ongoing work to control this and other invasive species, including mice, rats, true thrushes, sparrow and feral cats.

[6] Three endemic species dominate the montane forests of the archipelago: Drimys confertifolia on both main islands; Nothomyrcia fernandeziana on Robinson Crusoe; and Myrceugenia schulzei on Alexander Selkirk.

[7] The Juan Fernández Archipelago has a very limited fauna, with no native land mammals,[8] reptiles, or amphibians.

Robinson Crusoe Island is home to an endemic and endangered hummingbird, the Juan Fernández firecrown (Sephanoides fernandensis).

[9] The endemic Juan Fernandez spiny lobster (without claws) lives in the marine waters (Jasus frontalis).