1780 was a leap year starting on Saturday (see link for calendar).
Events
- January 16 - American Revolutionary War: Battle of Cape St. Vincent
- February - League of Armed Neutrality alliance formed between Denmark, Sweden, and Russia.
- March 26 - The British Gazette and Sunday Monitor, the first Sunday newspaper in Britain
- April 16 - The University of Münster in Münster, North Rhine-Westphalia, Germany is founded
- May 12 - American Revolutionary War: Charleston, South Carolina is taken by British forces.
- May 29 - American Revolutionary War: Loyalist forces under Col. Banastre Tarleton kill surrendering American soldiers in the Waxhaw Massacre.
- August 16 - American Revolutionary War: Battle of Camden - The British defeat the Americans near Camden, South Carolina.
- September 25 – Benedict Arnold flees to British-held New York
- October 2 - American Revolutionary War: British spy John Andre is hanged by American forces.
- October 7 - Overmountain Men defeat British forces under Major Patrick Ferguson at the Battle of King's Mountain.
- October 10-16 – Great hurricane flattens the islands of Barbados, Martinique and St. Eustatius
- November 29 - Maria Theresa of Austria dies and her Habsburg dominions pass to her ambitious son, Joseph II, who has already been Holy Roman Emperor since 1765.
Births
Deaths
- February 14 - William Blackstone, English jurist (b. 1723)
- February 17 - Andreas Felix von Oefele, German historian and librarian (b. 1706)
- February 18 - Kristijonas Donelaitis, Lithuanian poet (b. 1714)
- March 26 - Charles I, Duke of Brunswick-Lüneburg (b. 1713)
- May 18 - Charles Hardy, British governor of Newfoundland
- June 3 - Thomas Hutchinson, American colonial governor of Massachusetts (b. 1711)
- July 4 - Prince Charles Alexander of Lorraine, Austrian military leader (b. 1712)
- July 14 - Charles Batteux, French philosopher (b. 1713)
- August 3 - Étienne Bonnot de Condillac, French philosopher (b. 1715)
- August 29 - Jacques-Germain Soufflot, French architect (b. 1713)
- September 4 - John Fielding, English magistrate and social reformer (b. 1721)
- September 8 - Enoch Poor, American Revolutionary general (b. 1736)
- October 17 - William Cookworthy, English chemist (b. 1705)
- November 26 - Sir James Denham Steuart, 4th Baronet, British economist (b. 1712)
- November 29 - Empress Maria Theresa of Austria (b. 1717)
- December 26 - John Fothergill, English physician (b. 1712)
- Thomas Dilworth, British cleric and writer
1780
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