- Dec 1 Jacques Charles and Nicolas Roberts make first untethered ascension with gas hydrogen balloon in Paris
- Dec 4 General Washington bids officers farewell at Fraunce's Tavern, NYC
- Dec 9 First execution at Newgate Jail in London (now the site of the Central Criminal Court aka the Old Bailey), relocated from Tyburn (now the site of Marble Arch)
Historic Event
Dec 18 British King George III dismisses Duke of Portland's government
Historic Event
Dec 19 William Pitt the Younger becomes the youngest ever British Prime Minister at age 24
Historic Event
Dec 23 US General George Washington resigns his military commission as Commander-in-Chief of the Army to Congress
- Dec 31 Import of African slaves banned by all of the Northern US states