Coordinates: 23°0′S 143°0′E / 23°S 143°E / -23; 143 Queensland is the second-largest and third-most populous state of Australia, located in the northeast of the country. It is bordered by the Northern Territory, South Australia and New South Wales to the west, southwest and south respectively. To the east, Queensland is bordered by the Coral Sea and Pacific Ocean. Queensland has a population of 4,580,700, concentrated along the coast and particularly in the state's South East. The state is the world's sixth largest subnational entity, with an area of 1,852,642 km2. The capital and largest city in the state is Brisbane, Australia's third largest city. Referred to as the 'Sunshine State', Queensland is home to 10 of Australia's 30 largest cities and is the nation's third largest economy.

Queensland was first occupied by Indigenous Australians and Torres Strait Islanders, who arrived at least 40,000 years ago. The first European to land in Queensland was Dutch navigator Willem Janszoon in 1607. In 1770, Lieutenant James Cook claimed the east coast of Australia for the Kingdom of Great Britain. The colony of New South Wales was founded in 1788 by Governor Arthur Phillip at Sydney; New South Wales at that time included all of what is now Queensland, Victoria and Tasmania. Queensland was explored in subsequent decades until the establishment of a penal colony at Brisbane in 1824 by John Oxley. Penal transportation ceased in 1839 and free settlement permitted in 1842. Queensland was separated from New South Wales, forming a self-governing colony, on 6 June 1859, a date now celebrated state-wide as Queensland Day. Queensland achieved statehood with the Federation of Australia on 1 January 1901.

Australia ( /əˈstreɪljə/), officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent as well as the island of Tasmania and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area. Neighbouring countries include Indonesia, East Timor and Papua New Guinea to the north; the Solomon Islands, Vanuatu and New Caledonia to the north-east; and New Zealand to the south-east.

For at least 40,000 years before European settlement in the late 18th century, Australia was inhabited by indigenous Australians, who belonged to one or more of roughly 250 language groups. After discovery by Dutch explorers in 1606, Australia's eastern half was claimed by Great Britain in 1770 and settled through penal transportation to the colony of New South Wales from 26 January 1788. The population grew steadily in subsequent decades; the continent was explored and an additional five self-governing Crown Colonies were established.