The Northern Territory is a federal territory of Australia, occupying much of the centre of the mainland continent, as well as the central northern regions. It shares borders with Western Australia to the west (129th meridian east), South Australia to the south (26th parallel south), and Queensland to the east (138th meridian east).

To the north, the territory is bordered by the Timor Sea, the Arafura Sea and the Gulf of Carpentaria. Despite its large area—over 1,349,129 square kilometres (520,902 sq mi), making it the third largest Australian federal division—it is sparsely populated. With a population of 227,025 it is the least populous of Australia's eight major states and territories.

The history of the Northern Territory began over 40,000 years ago when Indigenous Australians settled the region. Makassan traders began trading with the indigenous people of the Northern Territory for trepang from at least the 18th century onwards, and very likely for 300 years prior to that.

The coast of the territory was first seen by Europeans in the 17th century. The British were the first Europeans to attempt to settle the coastal regions in the 19th century; however no attempt was successful until the establishment of a settlement at Port Darwin in 1869. Today the economy is based on tourism, especially Kakadu National Park in the Top End and the Uluru-Kata Tjuta National Park (Ayers Rock) in central Australia, and mining.

The capital city is Darwin. The population is not concentrated in coastal regions but rather along the Stuart Highway. The other major settlements are (in order of size) Alice Springs, Katherine, Nhulunbuy, and Tennant Creek.

Residents of the Northern Territory are often known simply as 'Territorians'.

Indigenous Australians have lived in the present area of the Northern Territory for an estimated 40,000 years, and extensive seasonal trade links existed between them and the peoples of what is now Indonesia for at least five centuries.

With the coming of the British, there were four early attempts to settle the harsh environment of the northern coast, of which three failed in starvation and despair. The Northern Territory was part of New South Wales from 1825 to 1863, except for a brief time from February to December 1846, when it was part of the short lived colony of North Australia. It was part of South Australia from 1863 to 1911. Under the administration of South Australia, the overland telegraph was constructed between 1870 and 1872.

A railway was also built between Palmerston and Pine Creek between 1883 and 1889. The economic pattern of cattle raising and mining was established so that by 1911 there were 513,000 cattle. Victoria River Downs was at one time the largest cattle station in the world. Gold was found at Grove Hill in 1872 and at Pine Creek, Brocks Creek, Burrundi, and copper was found at Daly River.

On 1 January 1911, a decade after federation, the Northern Territory was separated from South Australia and transferred to Commonwealth control. Alfred Deakin opined at this time "To me the question has been not so much commercial as national, first, second, third and last. Either we must accomplish the peopling of the northern territory or submit to its transfer to some other nation."

For a brief time between 1927 and 1931 the Northern Territory was divided into North Australia and Central Australia at the 20th parallel of South latitude. Soon after this time, parts of the Northern Territory were considered in the Kimberley Plan as a possible site for the establishment of a Jewish Homeland, understandably considered the "Unpromised Land".

During World War II, most of the Top End was placed under military government. This is the only time since Federation that an Australian state or territory has been under military control. After the war, control for the entire area was handed back to the Commonwealth.

Indigenous Australians had struggled for rights to fair wages and land. An important event in this struggle was the strike and walk off by the Gurindji people at Wave Hill Cattle Station in 1966. The Commonwealth Government of Gough Whitlam set up the Woodward Royal Commission in February 1973, which set to inquire into how land rights might be achieved in the Northern Territory. Justice Woodward's first report in July 1973 recommended that a Central Land Council and a Northern Land Council be established in order to present to him the views of Aboriginal people. In response to the report of the Royal Commission a Land Rights Bill was drafted, but the Whitlam Government was dismissed before it was passed.

The Aboriginal Land Rights (Northern Territory) Act 1976 was eventually passed by the Fraser Government on 16 December 1976 and began operation on the following Australia Day (26 January 1977).

In 1978 the Territory was granted responsible government, with a Legislative Assembly headed by a Chief Minister.

During 1996 the Northern Territory was briefly one of the few places in the world with legal voluntary euthanasia, until the Federal Parliament overturned the legislation. Before the overriding legislation was enacted, three people committed suicide through voluntary euthanasia, a practice orchestrated by Dr. Philip Nitschke.

The population of the Northern Territory in late 2006 was estimated at 212,600 This was an 1.8% increase from the 2001 Australian Bureau of Statistics report, and the population represents 1% of the total population of Australia.

The estimated population of the Northern Territory at the end of 2008 was 221,100. The population grew 2.2% which was the second largest growth in the country with Queensland after Western Australia which grew 2.4%.

The Northern Territory's population is the youngest in Australia and has the largest proportion under 15 years of age and the smallest proportion aged 65 and over. The median age of residents of the Northern Territory is 30.3 years, almost six years younger than the national median age.

More than 100 nationalities are represented in the Northern Territory's population, including more than 50 organisations representing different ethnic groups.

The 2006 Census revealed that of the Northern Territory's population, 68.4% is of European descent. 64,491 (30.6%) English with 44,662 (20.2%), Irish with 14,346 (6.8%), Scottish with 11,759 (5.6%), German with 7,729 (3.7%) and Italian with 3,308 (1.5%). Indigenous Australian people make up 32.5% of the Northern Territory's population, while Chinese people with 4,081 make up (1.9%).

Indigenous Australians own some 49% of the land. The life expectancy of Aboriginal Australians is well below that of non-Indigenous Australians in the Northern Territory, a fact that is mirrored elsewhere in Australia. ABS statistics suggest that Indigenous Australians die about 11 years earlier than the average Australian. There are Aboriginal communities in many parts of the territory, the largest ones being the Pitjantjatjara near Uluru, the Arrernte near Alice Springs, the Luritja between those two, the Warlpiri further north, and the Yolngu in eastern Arnhem Land.

In terms of birthplace, according to the 2006 census 13.8% of the population were born overseas. 2.6% of Territorians were born in England, 1.7% in New Zealand, 1.0% in Philippines, 0.6% in the United States and 0.5% in East Timor.

More than 54% of Territorians live in Darwin, located in the territory's north (Top End). The greater Darwin metropolitan area and nearby Palmerston is home to 120,900 people. Less than half of the territory's population live in the rural Northern Territory.

There are many very small settlements scattered across the territory, but the larger population centres are located on the single paved road that links Darwin to southern Australia, the Stuart Highway, known to locals simply as "the track".

The Northern Territory is also home to two spectacular natural rock formations, Uluru (Ayers Rock) and Kata Tjuta (The Olgas), which are sacred to the local Aboriginal peoples and which have become major tourist attractions.

In the northern part of the territory lies Kakadu National Park, which features breathtaking wetlands and native wildlife. To the north of that lies the Arafura Sea, and to the east lies Arnhem Land, whose regional centre is Maningrida on the Liverpool River delta. There is an extensive series of river systems in the Northern Territory. These rivers include: the Alligator Rivers, Daly River, Finke River, McArthur River, Roper River, Todd River and Victoria River.

The Northern Territory has two distinctive climate zones.

The northern end, including Darwin, has a tropical climate with high humidity and two seasons, the wet (November to April) and dry season (May to October). During the dry season nearly every day is warm and sunny, and afternoon humidity averages around 30%. There is very little rainfall between May and September. In the coolest months of June and July, the daily minimum temperature may dip as low as 14 °C (57 °F), but very rarely lower, and frost has never been recorded.

The wet season is associated with tropical cyclones and monsoon rains. The majority of rainfall occurs between December and March (the southern hemisphere summer), when thunderstorms are common and afternoon relative humidity averages over 70% during the wettest months. On average more than 1,570 mm (62 in) of rain falls in the north. Rainfall is highest in north west coastal areas, where rainfall averages from 1,800-2,100mm.

The central region is the desert centre of the country, which includes Alice Springs and Ayers Rock, and is semi-arid with little rain usually falling during the hottest months from October to March. Central Australia receives less than 250 mm (9.8 in) of rain per year.

The highest temperature recorded in the territory was 48.3 °C (118.9 °F) at Finke on 1 and 2 January 1960. The lowest temperature was −7.5 °C (18 °F) at Alice Springs on 12 July 1976.

The Northern Territory's economy is largely driven by mining, which is concentrated on energy producing minerals, petroleum and energy and contributes around $2.5 billion to the gross state product and employs over 4,600 people. Mining accounts for 26 per cent of the gross state product in 2006 - 2007 compared to just 7 per cent nationally.

The economy has continued to grow during the 2005 - 2006 financial year from the past two financial years. Between 2003 and 2006 the gross state product had risen from $8,670 million to $11,476 million and increase of 32.4 per cent. During the three years to 2006 - 2007 the Northern Territory gross state product grew by an average annual rate of 5.5 per cent. Gross state product per capita in the Northern Territory ($72,496) is higher than any Australian state or territory, and is also higher than the gross domestic product per capita for Australia ($54,606). This can be attributed to the recent mining and resources boom.

The Northern Territory's exports were up 19 per cent during 2005 - 2006. The largest contributor to the territory's exports was: oil and gas (33.4 per cent), iron-ore (20. per cent), other manufacturing (5.9 per cent) and agriculture (4.9 per cent). Imports to the Northern Territory totalled $2,887.8 million which consisted of mainly machinery and equipment manufacturing (58.4 per cent) and petroleum, coal, chemical and associated product manufacturing (17.0 per cent).

The principal mining operations are bauxite at Gove Peninsula where the production is estimated to increase 52.1 per cent to $254 million in 2007-08. Manganese at Groote Eylandt, production is estimated to increase 10.5 per cent to $1.1 billion which will be helped by the newly developed mines include Bootu Creek and Frances Creek. Gold is estimated to increase 21.7 per cent to $482 million at the Union Reefs plant. Uranium at Ranger Uranium Mine.

Tourism is one of the major industries on the Northern Territory. Iconic destinations such as Uluru and Kakadu make the Northern Territory a popular destination for domestic and international travellers. Diverse landscapes, spectacular waterfalls, wide open spaces, aboriginal culture, wild and untamed wildlife, all create a unique opportunity for the visitor to immerse themselves in the natural wonder that the Northern Territory offers. Images of Uluru (Ayers Rock) are recognised around the world ensuring that Tourism in the Northern Territory will remain a vital component of its future. In 2005-06, 1.38 million people visited the Northern Territory. They stayed for 9.2 million nights and spent over $1.5 billion.

The territory is well known for being promoted with the slogan "You'll Never Never Know if you Never Never Go". This was implemented as a result of the Kennedy Review in 1992.

The Northern Territory is the most sparsely populated state or territory in Australia. From its establishment in 1869 the Port of Darwin  was the major Territory supply for many decades. It was damaged in the 1942 Japanese air raids and subsequently restored. In the late 1960s improved roads in adjoining States linking with the Territory, port delays and rapid economic development led to uncertainty in port and regional infrastructure development. As a result of the Commission of Enquiry established by the Administrator, port working arrangements were changed, berth investment deferred and a port masterplan prepared. Extension of rail transport was then not considered because of low freight volumes.

Despite its sparse population there is a network of sealed roads, including two National Highways, linking with adjoining States and connecting the major Territory population centres,and some other centres such as Uluru (Ayers Rock), Kakadu and Litchfield National Parks. The Stuart Highway, known as "The Track", runs north to south, connecting Darwin and Alice Springs to Adelaide. Some of the sealed roads are single lane bitumen. Many unsealed (dirt) roads connect the more remote settlements.

The Adelaide-Darwin Railway, a new standard gauge railway, connects Adelaide via Alice Springs with Darwin, replacing earlier narrow gauge railways which only went north as far as Alice Springs.

The Northern Territory was one of the few remaining places in the world with no speed restrictions on public roads. Since 1 January 2007 a default speed limit of 110 km/h applies on roads outside of urban areas (Inside urban areas of 40, 50 or 60 km/h). Speeds of up to 130 km/h are permitted on some major highways, such as the Stuart Highway.

Since the introduction of a universal 130 km/h speed limit in 2006, together with the introduction of demerit (penalty) points for speeding, the Territory's road toll has risen markedly. The road toll for 2009 to November 7, however, is under half of that for the same period in 2008 and lower than for the same period in the previous four years.

Darwin International Airport is the major domestic and international airport for the territory. Several smaller airports are also scattered throughout the Territory and are served by smaller airlines; including Alice Springs Airport, Ayers Rock Airport, Katherine Airport and Tennant Creek Airport.