This is a list of selected December 6 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. Before doing so, please review the selected anniversaries guidelines. If your suggestion is potentially controversial or relates to a day currently or soon to appear on the Main Page, post it on the talk page instead.
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December 6: Independence Day in Finland (1917); Constitution Day in Spain
- 1534 – Over 200 Spanish settlers led by conquistador Sebastián de Belalcázar (pictured) founded what is now Quito, Ecuador.
- 1768 – The first weekly installment of the first edition of the Encyclopædia Britannica was released in Edinburgh, Scotland.
- 1865 – Slavery in the United States was officially abolished when the Thirteenth Amendment to the U.S. Constitution was ratified.
- 1917 – A ship in Halifax Harbour carrying trinitrotoluene (TNT) and picric acid caught fire after a collision with another ship and exploded, devastating Halifax, Nova Scotia, Canada.
- 1922 – The Irish Free State, the first independent Irish state to be recognised by the British government, came into existence, one year to the day after the signing of the Anglo-Irish Treaty.
- 1989 – The École Polytechnique massacre: Twenty-five year-old Marc Lépine killed fourteen women and injured ten women and four men at the École Polytechnique in Montreal, Quebec.
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