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This is a list of selected January 20 anniversaries that appear in the "On this day" section of the Main Page. To suggest a new item, in most cases, you can be bold and edit this page. Please read the selected anniversaries guidelines before making your edit. However, if your addition might be controversial or on a day that is or will soon be on the Main Page, please post your suggestion on the talk page instead.

Please note that the events listed on the Main Page are chosen based more on relative article quality and to maintain a mix of topics, not based solely on how important or significant their subjects are. Only four to five events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is generally not posted this year if it is also the subject of the scheduled featured article, featured list or picture of the day.

To report an error when this appears on the Main Page, see Main Page errors. Please remember that this list defers to the supporting articles, so it is best to achieve consensus and make any necessary changes there first.

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Blurb Reason
; Army Day in Mali refimprove
1320 – After reuniting Poland, Władysław I Łokietek was crowned king in Kraków. refimprove
1523Christian II was forced to abdicate as both king of Denmark and king of Norway. refimprove section
1576León in Guanajuato, Mexico, was founded by order of Viceroy Martín Enríquez de Almanza of New Spain. refimprove section
1785Tây Sơn forces of Vietnam annihilated an invading Siamese army who were attempting to restore Nguyễn Ánh to the throne. refimprove section
1839 – Chilean troops decisively defeated the forces of the Peru-Bolivian Confederation at the Battle of Yungay in the Ancash Region of Peru, effectively ending the War of the Confederation. refimprove/unreferenced sections
1840William II became King of the Netherlands after his father William I abdicated the throne. refimprove
1877 – The Constantinople Conference concluded with the Great Powers declaring the need for political reforms, which the Ottoman Empire refused to undertake, later resulting in the Russo-Turkish War. Date uncited
1885LaMarcus Adna Thompson, sometimes called the "Father of Gravity", patented the roller coaster. refimprove sections
1921 – The first Turkish Constitution was ratified by the Grand National Assembly, enshrining the principle of national sovereignty. refimprove
1946 – Favouring stronger executive power than the draft constitution for the French Fourth Republic provided, Charles de Gaulle resigned as president of the Provisional Government. refimprove sections
1980 – The United States announced it would boycott the Summer Olympics in Moscow unless the Soviet Union withdrew from Afghanistan within one month. unreferenced section
1981Iran hostage crisis: Iran released the final 52 American hostages after 444 days in captivity. appears on November 4
2001 – As a result of the EDSA Revolution of 2001, Gloria Macapagal Arroyo succeeded into the presidency after her predecessor, Joseph Estrada, resigned from office. refimprove section
Myles Coverdale |d|1569| Too much uncited

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Notes

January 20: Day of Nationwide Sorrow in Azerbaijan (1990)

Icelandic financial crisis protesters
Icelandic financial crisis protesters
More anniversaries: