Seven states maintain a territorial claim on eight territories in Antarctica. These countries have tended to site their scientific observation and study facilities in Antarctica within their claimed territory.

It is sometimes said that the Antarctic Treaty defers or suspends these claims. However, Article IV § 2 states: “No acts or activities taking place while the present Treaty is in force shall constitute a basis for asserting, supporting or denying a claim to territorial sovereignty in Antarctica. No new claim, or enlargement of an existing claim, to territorial sovereignty shall be asserted while the present Treaty is in force” neither deferring nor suspending existing claims.

Seven sovereign states had made eight territorial claims to land in Antarctica south of the 60° S parallel before 1961. These claims have been recognized only between the countries making claims in the area. All claim areas are sectors, with the exception of Peter I Island. None of these claims have an indigenous population. The South Orkney Islands fall within the territory claimed by Argentina and United Kingdom; and the South Shetland Islands fall within the areas claimed by Argentina, Chile, and the United Kingdom. The UK, France, Australia, New Zealand and Norway all recognize each others' claims, which do not overlap. Prior to 1962, British Antarctic Territory was a dependency of the Falkland Islands and also included South Georgia and the South Sandwich Islands. The Antarctic areas became a separate overseas territory following the ratification of the Antarctic Treaty. South Georgia and the South Sandwich Islands remained a dependency of the Falkland Islands until 1985 when they too became a separate overseas territory.

The Antarctic ( /ænˈtɑrktɪk/ or  /ænˈtɑrtɪk/) is a polar region, specifically the region around the Earth's South Pole, opposite the Arctic region around the North Pole. The Antarctic comprises the continent of Antarctica and the ice shelves, waters, and island territories in the Southern Ocean situated south of the Antarctic Convergence. The region covers some 20% of the Southern Hemisphere, of which 5.5% (14 million km²) is the surface area of the continent itself.

The maritime part of the region constitutes the area of application of the international Convention for the Conservation of Antarctic Marine Living Resources (CCAMLR), where for technical reasons the Convention uses an approximation of the Convergence line by means of a line joining specified points along parallels of latitude and meridians of longitude. The implementation of the Convention is managed through an international Commission headquartered in Hobart, Australia by an efficient system of annual fishing quotas, licenses and international inspectors on the fishing vessels, as well as satellite surveillance.

The British Antarctic Territory (BAT) is a sector of Antarctica claimed by the United Kingdom as one of its 14 British Overseas Territories. It comprises the region south of 60°S latitude and between longitudes 20°W and 80°W, forming a wedge shape that extends to the South Pole. The Territory was formed on 3 March 1962, although the UK's claim to this portion of the Antarctic dates back to Letters Patent of 1908 and 1917. The area now covered by the Territory includes three regions which, before 1962, were administered by the British as separate dependencies of the Falkland Islands: Graham Land, the South Orkney Islands, and the South Shetland Islands. Since the Antarctic Treaty came into force in 1961, Article 1 of which states "The treaty does not recognize, dispute, nor establish territorial sovereignty claims; no new claims shall be asserted while the treaty is in force", most countries do not recognise territorial claims in Antarctica.

The Territory overlaps the Antarctic claims of Argentina (Argentine Antarctica) and Chile (Antártica Chilena Province). It is inhabited by the staff of research and support stations operated and maintained by the British Antarctic Survey and other organisations, and stations of Argentina, Chile and other countries. There are no native inhabitants.