What is the status of Antarctica in terms of visa regulation? Does one need a visa to visit Antarctica? If so, which country does issue such a visa?
There are seven countries which have territorial claims on parts of Antarctica: Britain, France, Australia, New Zealand, and Norway, which all recognize each other's claims; and Chile and Argentina, whose claims are disputed.
In practice, however, all claims are suspended under international treaty, and there are no checkpoints or immigration officers. For most people, a visit to Antarctica consists of a flight over it or a ride on a ship through its waters, neither involving disembarkation and thus both avoiding immigration formalities.
Land tourism does exist, and a permit is required. The vast majority of visitors will arrive by commercial ship or helicopter, and the tour operator is responsible for obtaining the necessary permits. You may, of course, need a visa for the country where your tour is departing from.
To land on the continent in a private vessel such as a yacht, you would need to obtain a permit yourself from your own government, if your country is a signatory to the Antarctic Treaty System. For example, Britons would apply to the Foreign and Commonwealth Office, Polar Regions Department; Americans would file the DS-4131 Advance Notification Form – Tourist and Other Non-Governmental Activities in the Antarctic Treaty Area with the Department of State’s Office of Ocean and Polar Affairs
Due to Antartica's extreme physical conditions and remoteness, only a few dozen yachts make the trip each year, and there are special yachting guidelines for Antarctic cruises.
For a list of tour operators, see the International Association of Antarctica Tour Operators.