Los Glaciares National Park is a federal protected area in Santa Cruz Province, Argentina.

The park covers an area of 7269 km2, making it the largest national park in the country. Established on 11 May 1937, it hosts a representative sample of Magellanic subpolar forest and west Patagonian steppe biodiversity in good state of conservation. In 1981, it was declared a World Heritage Site by UNESCO.

The park's name refers to the giant ice cap in the Andes, the largest outside of Antarctica, Greenland and Iceland, feeding 47 large glaciers, of which 13 flow towards the Atlantic Ocean. In other parts of the world, glaciers start at a height of at least 2,500 m above mean sea level, but due to the size of the ice cap, these glaciers begin at only 1,500 m, sliding down to 200 m. Los Glaciares borders Torres del Paine National Park to the south in Chilean territory.
This park shows a scenario of mountains, lakes and woods, including a large portion of the Andes practically under ice and snow to the west, and the arid Patagonian steppe to the east.

Its name refer to the glaciers that are born on the Ice Caps - the largest continental ice extension after Anctartica- which occupies almost half its area. Also known as Patagonic Continental Ice, creates 47 big glaciers, 13 of which flow to the Atlantic. There are also more than 200 smaller glaciers, unconnected to the Ice Caps.

Los Glaciares National Park is located in the area known as Austral Andes in Argentina, in the south west of Santa Cruz on the border with Chile.

As a result of the enormous pressure of the antique ice and the subsequent thaw, three big lakes, two of them inside the NP appeared: Lago Argentino and Lago Viedma, the waters of which flow as Rio Santa Cruz to the Atlantic Ocean crossing the province.

Los Glaciares, of which 30% is covered by ice, can be divided in two parts, each corresponding with one of the two elongated big lakes partially contained by the park. Lake Argentino, 1,466 km2 and the largest in Argentina, is in the south, while Lake Viedma, 1,100 km2, is in the north. Both lakes feed the Santa Cruz River that flows down to lower part Puerto Santa Cruz on the Atlantic. Between the two halves is a non-touristic zone without lakes called Zona Centro.

The northern half consists of part of Viedma Lake, the Viedma Glacier and a few minor glaciers, and a number of mountains very popular among fans of climbing and trekking, including Mount Fitz Roy and Cerro Torre.

The southern part has, as well as a number of smaller ones, the major glaciers which flow into Lake Argentino: Perito Moreno Glacier, Upsala Glacier, and Spegazzini Glacier. Typical excursion boats travel between icebergs to visit Bahía Onelli, and the otherwise inaccessible Spegazzini and Upsala. Perito Moreno is reachable by land.

The mountains hold most of the humidity from the Pacific Ocean, letting through only the ice coldness and creating the arid Patagonian steppe on the Argentine side of the range. This area is habitat for ñandúes, guanaco, cougar, and South American gray fox, the latter of which has suffered from the invasion of the cattle industry and are endangered. The guanaco, while not endangered, has had a dramatic decline in historic population due to large scale grazing of livestock throughout much of Patagonia. There are over 100 species of birds in the area (condors, eagles, and others). Between the ice and the Patagonian steppe there is a fertile area of Magellanic subpolar forests composed mainly of lengas and guindos, but also ñires. Within these more hospitable areas also live huemul deer and torrent duck.

Los Glaciares is a major attraction for international tourists. Starting points of tours are the village of El Calafate at the shore of Lake Argentino but outside the park, where the park's administration has its headquarters, and El Chaltén village in the northern part of the park, at the foot of the Fitz Roy. Other touristic points in the park include Lago del Desierto and Lago Roca.

It was also used as one of the filming locations for "Return of the Ice", the second episode of the speculative science documentary series The Future is Wild.
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