Theth National Park (Albanian:Parku Kombëtar i Thethit) is a national park in extreme northern Albania declared by government decree in 1966. It covers an area of 2,630 hectares and is located along the Theth River. The main attractions in the park are the Grunas Waterfall and the Lock-in Tower.

Valbonë Valley National Park is adjacent to it and was declared a national park in 1996. It is proposed that the two parks, along with the areas in Montenegro and Kosovo form a tri-border Bjeshket e Nemuna National Park.

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Coordinates: 42°24′00″N 19°46′48″E / 42.4°N 19.78°E / 42.4; 19.78

Theth (Definite Albanian form: Thethi) is a community in the Shalë municipality, Shkodër District, Shkodër County, northern Albania.

The community is at the centre of the Theth National Park, an area of outstanding natural beauty.

Local tradition asserts a single common ancestor for the community (one Ded Nika) and suggests that the population moved to Theth some 300 to 350 years ago in order to preserve their (Catholic) Christian traditions.

Visiting Theth in the early 20th century, the traveller Edith Durham said:

I think no place where human beings live has given me such an impression of majestic isolation from all the world.

Durham described Theth as a "bariak" of some 180 houses and also observed that it was almost free from the tradition of blood feud (known in the Albanian language as Gjakmarrja) which so blighted other parts of the Albanian highlands.

Theth remains remote. It is most easily accessible by a 25 km unmade road from the village of Boga which is impassible during the winter months and is not generally suitable at any time of the year for motor vehicles without off-road capabilities.

A national park is a reserve of natural, semi-natural, or developed land that a sovereign state declares or owns. Although individual nations designate their own national parks differently (for example, see Martin Luther King, Jr. Memorial in the United States), an international organization, the International Union for Conservation of Nature (IUCN), and its World Commission on Protected Areas, has defined National Parks as its category II type of protected areas. While ideas for this type of national park had been suggested previously, the United States established the first such one, Yellowstone National Park, in 1872. The largest national park in the world meeting the IUCN definition is the Northeast Greenland National Park, which was established in 1974. According to the IUCN, there were 6,555 national parks worldwide in 2006 that meet its criteria.

In 1969 the IUCN (International Union for the Conservation of Nature and Natural Resources) declared a national park to be a relatively large area with particular defining characteristics. A national park was deemed to be a place