Year 1840 (MDCCCXL) was a leap year starting on Wednesday (link will display the full calendar) of the Gregorian calendar (or a leap year starting on Monday of the 12-day slower Julian calendar).
Events of 1840
January - June
- January 3 - One of the predecessor papers of the Herald Sun of Melbourne, Australia, The Port Phillip Herald, is founded.
- January 10 - Uniform penny postage introduced in the UK.
- January 13 - The steamship Lexington burns and sinks in icy waters, four miles off the coast of Long Island: 139 died, only 4 survived.
- January 19 - Captain Charles Wilkes circumnavigates Antarctica, claiming what became known as Wilkes Land for the United States.
- January 20
- January 22 - British colonists reach New Zealand. Official founding date of Wellington.
- February - Rhodes blood libel against the Jews of Rhodes.
- February 5 - The murder of a Capuchin friar and his Greek servant leads to the Damascus affair, a highly publicized case of blood libel against the Jews of Damascus.
- February 6 - Treaty of Waitangi, document granting British sovereignty in New Zealand, is signed.
- February 10 - Queen Victoria of the United Kingdom marries Prince Albert of Saxe Coburg-Gotha.
- February 11 - Gaetano Donizetti's opera La Fille du Regiment premieres in Paris.
- March 1
- April 15 - King's College Hospital opens in Portugal Street, London.
- May 1 - Britain issues the Penny Black, world's first postage stamp.
- May 6 - The Penny Black, world's first postage stamp becomes valid for the pre-payment of postage.
- May 7 - The Great Natchez Tornado: A massive tornado strikes Natchez, Mississippi during the early afternoon hours. Before it was over, 317 people had lost their lives and 109 were injured. It is the second deadliest tornado in U.S. history.
- May 21 - New Zealand is declared a British colony.
July - December
Undated
The frigate Belle-Poule brings back the remains of Napoléon to France.
Ongoing events
Births
January - June
- January 3 - Father Damien, Belgian missionary priest (d. 1889)
- January 22 - Ernest Roland Wilberforce, English bishop (d. 1907)
- January 23 - Ernst Abbe, German physicist (d. 1905)
- January 26 - John Clayton Adams, British landscape artist (d. 1906)
- February 4 - Hiram Stevens Maxim, American firearms inventor (d. 1916)
- February 5 - John Boyd Dunlop, Scottish inventor (d. 1921)
- February 21 - Murad V, Ottoman Sultan (d. 1904)
- February 22 - August Bebel, German politician (d. 1913)
- February 23 - Carl Menger, Austrian economist (d. 1921)
- February 29 - John Philip Holland, Irish inventor (d. 1914)
- March 28 - Emin Pasha, German doctor and African administrator (d. 1892)
- April 2 - Emile Zola, French writer (d. 1902)
- April 22 - Odilon Redon, French painter (d. 1916)
- April 27 - Edward Whymper, English mountaineer (d. 1911)
- May 7 - Pyotr Ilyich Tchaikovsky, Russian composer (d. 1893)
- May 13 - Alphonse Daudet, French writer (d. 1897)
- June 2 - Thomas Hardy, English writer (d. 1928)
- June 10 - Theodor Philipsen Danish painter (d. 1920)
July - December
Deaths
January - June
- January 6 - Fanny Burney, English novelist (b. 1752)
- January 22 - Johann Friedrich Blumenbach, German anthropologist (b. 1752)
- February 13 - Nicolas Joseph Maison, French marshal and Minister of War (b. 1770)
- April 25 - Siméon-Denis Poisson, French mathematician, geometer, and physicist (b. 1781)
- May 1 - Joseph Williamson, philanthropist and builder of Williamson's tunnels (b. 1769)
- May 6 - Demetrius Augustine Gallitzin, Russian aristocrat and priest (b. 1770)
- May 7 - Caspar David Friedrich, German artist (b. 1774)
- May 11 - Thomas Cooper, American political philosopher (b. 1759)
- May 26 - Sidney Smith, British admiral (b. 1764)
- May 27 - Nicolò Paganini, Italian violinist and composer (b. 1782)
- June 7 - King Frederick William III of Prussia (b. 1770)
July - December
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