Template:Encyclopedia Westarctica:This month in history/December
- 01 December - The Antarctic Treaty is signed by the United States. (1959)
- 05 December - The Achaean Royal Charter is decreed by the Consul-General. (2002)
- 05 December - Westarctica is incorporated as a non-profit corporation in the state of California. (2014)
- 10 December - Michael Cary is awarded the 2022 Westarctica Conservation Scholarship. (2022)
- 11 December - Sir Charles Ross is appointed Foreign Minister of Westarctica. (2022)
- 14 December - Norwegian explorer Roald Amundsen becomes the first person to reach the South Pole. (1911)
- 18 December - American Antarctic explorer, Paul A. Siple is born in Montpelier, Ohio. (1908)
- 18 December - The Baron of Abele is appointed Commissioner of Elections in preparation to elect the next Prime Minister of Westarctica. (2018)
- 25 December - The Ecumenical Church of Westarctica is founded. (2018)
- 28 December - Grand Duke Travis marries Prince-Consort Dinny in a civil ceremony in Los Angeles, California. (2016)
- 30 December - At the conclusion of the 2008 Transition of Power, the Duke of Moulton-Berlin assumed the throne of Westarctica as Grand Duke Jon-Lawrence. (2008)