The Australian Antarctic Territory (AAT) is a part of Antarctica. It was claimed by the United Kingdom and placed under the authority of the Commonwealth of Australia in 1933.
It is the largest territory of Antarctica claimed by any nation. Since the Antarctic Treaty came into force in 1961, Article 4 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.
AAT consists of all the islands and territory south of 60°S and between 45°E and 160°E, except for Adélie Land (136°E to 142°E), which divides the territory into Western AAT (the larger portion) and Eastern AAT. It is bounded by Queen Maud Land in the West and by Ross Dependency in the East. The area is estimated at 5,896,500 km².
The territory is inhabited by the staff of research stations. The Australian Antarctic Division administers the area primarily by maintaining three year-round stations (Mawson, Davis and Casey), which support various research projects.
Face value | Family number | English name | Scientific name
| 1959.01 | 16.12.1959 | Definitives | | |
| 2s/3d | 16 | Emperor Penguin Aptenodytes forsteri | |
| 1966.01 | 28.09.1966 | Definitives | | |
| 2c | 16 | Emperor Penguin Aptenodytes forsteri | |
| 1973.01 | 05.08.1973 | Definitives | | |
| 7c | 16 | Adelie Penguin Pygoscelis adeliae | |
| 20c | 17 | Wandering Albatross Diomedea exulans | |
| 20c | 16 | Adelie Penguin Pygoscelis adeliae | |
| 1983.01 | 06.04.1983 | Regional wildlife | 5v strip | |
| 27c | 17 | Light-mantled Albatross Phoebetria palpebrata | |
| 27c | 32 | Macquarie Shag Leucocarbo purpurascens | |
| 27c | 16 | Royal Penguin Eudyptes schlegeli | |
| 27c | 18 | Antarctic Prion Pachyptila desolata | |
| 1985.01 | 07.08.1985 | Antarctic scenes | | |
| 1$ | 16 | Emperor Penguin Aptenodytes forsteri | |
| 1988.01 | 20.07.1988 | Environment, conservation and technology | 5v set | |
| 37c | 16 | Emperor Penguin Aptenodytes forsteri | |
| 37c | 16 | Adelie Penguin Pygoscelis adeliae | |
| 37c | 17 | Grey-headed Albatross Thalassarche chrysostoma | |
| 1992.01 | 14.05.1992 | Antarctic wildlife | | |
| 45c | 16 | Adelie Penguin Pygoscelis adeliae | |
| 85c | 18 | Northern Giant Petrel Macronectes halli | |
| 1.20$ | 16 | Emperor Penguin Aptenodytes forsteri | |
| 1993.01 | 14.01.1993 | Antarctic wildlife | | |
| 1$ | 16 | Royal Penguin Eudyptes schlegeli | |
| 1.50$ | 16 | King Penguin Aptenodytes patagonicus | |
| 2000.01 | 24.07.2000 | Antarctic penguins | | |
| 45c | 16 | Emperor Penguin Aptenodytes forsteri | |
| 45c | 16 | Adelie Penguin Pygoscelis adeliae | |
| 2001.01 | 17.05.2001 | Australians in the Antarctic | 20v sheet | |
| 5c | 16 | Adelie Penguin Pygoscelis adeliae | |
| 45c | 16 | Emperor Penguin Aptenodytes forsteri | |
| 2001.02 | 11.09.2001 | WWF | 4v set | |
| 45c | 16 | Adelie Penguin Pygoscelis adeliae | |
| 45c | 16 | Adelie Penguin Pygoscelis adeliae | |
| 45c | 16 | Adelie Penguin Pygoscelis adeliae | |
| 2002.01 | 02.07.2002 | Australian Antarctic research | 4v set | |
| 45c | 17 | Wandering Albatross Diomedea exulans | |
| 45c | 16 | Adelie Penguin Pygoscelis adeliae | |
| 2003.01 | 15.04.2003 | Antarctic ships | 4v set | |
| 1.45$ | 16 | Adelie Penguin Pygoscelis adeliae | |
| 2004.01 | 13.02.2004 | Mawson station 1954 - 2004 | 4v set | |
| 1.45$ | 16 | Emperor Penguin Aptenodytes forsteri | |
| 50c | 16 | Royal Penguin Eudyptes schlegeli | |
| 50c | 16 | Royal Penguin Eudyptes schlegeli | |
| 1$ | 16 | Royal Penguin Eudyptes schlegeli | |
| 1$ | 16 | Royal Penguin Eudyptes schlegeli | |
| 2007.02 | WWF | Booklet | 2007.01 |
| 50c | 16 | Royal Penguin Eudyptes schlegeli | |
| 50c | 16 | Royal Penguin Eudyptes schlegeli | |
| 2008.01 | 16.09.2008 | Polar year | 4v set | |
| 1.10$ | 16 | Emperor Penguin Aptenodytes forsteri | |
| 2008.02 | 16.09.2008 | Polar year | 4v sheet | 2008.01 |
| 1.10$ | 16 | Emperor Penguin Aptenodytes forsteri | |
| 2009.01 | 04.03.2009 | Preserve the polar regions and glaciers | 2v set | |
| 55c | 18 | Snow Petrel Pagodroma nivea | |
| 2009.02 | 04.03.2009 | Preserve the polar regions and glaciers | 2v sheet | 2009.01 |
| 55c | 18 | Snow Petrel Pagodroma nivea | |
| 2011.01 | 02.08.2011 | Antarctic expedition | 5v set | |
| 60c | 17 | Black-browed Albatross Thalassarche melanophris | |
| and | 16 | Gentoo Penguin Pygoscelis papua | |
| 2011.02 | 02.08.2011 | Antarctic expedition | 5v sheet | 2011.01 |
| 60c | 17 | Black-browed Albatross Thalassarche melanophris | |
| and | 16 | Gentoo Penguin Pygoscelis papua |
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