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1822 (MDCCCXXII) was a common year starting on Tuesday of the Gregorian calendar and a common year starting on Sunday of the Julian calendar, the 1822nd year of the Common Era (CE) and Anno Domini (AD) designations, the 822nd year of the 2nd millennium, the 22nd year of the 19th century, and the 3rd year of the 1820s decade. As of the start of 1822, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923.
- January 1 - The Greek Constitution of 1822 is adopted by the First National Assembly at Epidaurus.
- January 7 – The first group of freed slaves from the United States arrive to the west coast of Africa, founding Monrovia on April 25.
- January 9 - The Portuguese prince Pedro I of Brazil decides to stay in Brazil against the orders of the Portuguese King João VI, beginning the Brazilian independence process.
- January 13 – The design of the modern-day flag of Greece is adopted by the First National Assembly at Epidaurus, for their naval flag.
- January 14 - Greek War of Independence: Acrocorinth is captured by Theodoros Kolokotronis and Demetrios Ypsilantis.
- February 6 – Chinese junk Tek Sing sinks in the South China Sea, with the loss of around 1,600 people on board.
- February 9 – The invading Haitian forces, led by Jean-Pierre Boyer, arrive in Santo Domingo, to overthrow the newly founded Dominican Republic.
- February 24 – The first Swaminarayan temple, Kalupur Swaminarayan Mandir at Ahmedabad in the British Raj, is inaugurated.
- March 31 – Greek War of Independence – Chios massacre: 20,000 Greeks on the island of Chios are slaughtered by Ottoman troops, and 23,000 exiled.
- April 25 – The American Colonization Society lands at Cape Mesurado on the West African coast, after purchasing 60 miles of coastline. The settlement will soon become Monrovia, as the nation of Liberia is established to fill the ACS mission of freeing black American slaves and sending them "back to Africa". , reprinted by Cambridge University Press, 2013
- April 30 – British Foreign Secretary George Canning moves, in the House of Commons, to repeal a law that prohibited Roman Catholic peers from sitting or voting in the House of Lords; the motion passes, 235-223, on its second reading, but the House of Lords declines to pass it. 
- May 24 – Battle of Pichincha: Simón Bolívar secures the independence of Quito.
- May 25 – Christos Palaskas and Alexis Noutsos are executed by Odysseas Androutsos' forces.
- May 26 – Grue Church fire: 116 people are killed, in the biggest fire disaster in Norway's history.
- June 6 – Alexis St. Martin is accidentally shot in the stomach, which leads the way to William Beaumont's studies on digestion.
- July 3 – Charles Babbage publishes a proposal for a difference engine, a forerunner of the modern computer, for calculating logarithms and trigonometric functions. Construction of an operational version will proceed under British Government sponsorship (1823–32), but it will never be completed.
- July 8 – The Chippewas turn over a huge tract of land in Ontario to the United Kingdom.
- July 13 – Greek War of Independence: Greeks defeat Ottoman forces at Thermopylae.
- July 26 – Guayaquil Conference: José de San Martín arrives in Guayaquil, Ecuador, to meet with Simón Bolívar.
- July 27 – Guayaquil Conference: Simón Bolívar and General José de San Martín meet in Guayaquil, which Bolívar later annexes.
- July 31 – The last public whipping is carried out in Edinburgh.
- August 12 – St David's College (the modern-day University of Wales, Lampeter) is founded in Wales by Thomas Burgess, Bishop of St David's.
- August 15–29 – The Visit of King George IV to Scotland takes place.
- August 22 – English ship Orion lands at Yerba Buena, now named San Francisco, under the command of William A. Richardson.
- September 7 – Brazilian independence: Brazil declares its independence from Portugal.
- September 8–13 – Battle of Nauplia: In a series of naval engagements, the Ottoman Fleet fails to break through the Greek Fleet, under Admiral Andreas Vokos Miaoulis.
- September 11 – Galileo Galilei's Dialogue Concerning the Two Chief World Systems (1632) is permitted by the Roman Catholic Church to be published.
- September 16
- September 22 – Portugal approves its first Constitution.
- September 27 – Jean-François Champollion announces his success in deciphering Egyptian hieroglyphs, using the Rosetta Stone, in a letter to the Académie des Inscriptions et Belles-Lettres in Paris (based on the work of Thomas Young).
- October 8 – [The Galunggung volcano erupts on West Java, and is followed four days later by a second, more violent outburst; the two events kill more than 4,000 people and destroy 114 villages. .
- October 12 – Pedro, Crown Prince of Portugal, is declared the constitutional Emperor of Brazil, as Pedro the First.
- October 31 – Emperor Agustín de Iturbide of the First Mexican Empire dissolves the country's Congress of the Union, and replaces it with a military junta.
- October–December – Congress of Verona: Russia, Austria and Prussia approve French intervention in Spain.
- November 9 – Action of 9 November 1822: USS Alligator (1820) engages three pirate schooners off Cuba, as part of the West Indies anti-piracy operations of the United States.
- November 13
- November 19 – An earthquake near Valparaíso, Chile kills around 200, causes a tsunami and raises the coastal area.
- December 1 – Pedro I is crowned, as the first Emperor of Brazil.
- January 2 – Rudolf Clausius, German physicist (d. 1888)
- January 6
- January 9 – Carol Benesch, Silesian and Romanian architect (d. 1896)
- January 12 – Étienne Lenoir, Belgian engineer (d. 1900)
- January 25 – Charles Reed Bishop, preeminent businessman, philanthropist in Hawaii (d. 1915)
- January 28 – Alexander Mackenzie, 2nd Prime Minister of Canada (d. 1892)
- February 4 – Edward Fitzgerald Beale, American Navy Lieutenant, explorer (d. 1893)
- February 16 – Sir Francis Galton, English explorer, biologist (d. 1911)
- c. March – Harriet Tubman (born Araminta Ross), African-American abolitionist, humanitarian and spy (d. 1913)
- March 4 – Jules Antoine Lissajous, French mathematician (d. 1880)
- March 14 – Teresa Cristina of the Two Sicilies, Empress consort of Brazil (d. 1889)
- April 3 – Edward Everett Hale, American writer (d. 1909)
- April 16 – Robert Luther, German astronomer (d. 1900)
- April 26 – Frederick Law Olmsted, American landscape architect (d. 1903)
- April 27 – Ulysses S. Grant, 18th President of the United States (d. 1885)
- May 3 – István Bittó, 7th Prime MInister of Hungary (d. 1903)
- May 18 – Mathew Brady, American photographer (d. 1896)
- May 20 – Frédéric Passy, French economist, recipient of the Nobel Peace Prize (d. 1912)
- May 26 – Edmond de Goncourt, French writer (d. 1896)
- May 11 – Henry Baker Tristram, English clergyman, ornithologist. (d. 1906)
- June 10 – John Jacob Astor III, American businessman (d. 1890)
- July 4 – Jean-Baptiste Claude Eugène Guillaume, French sculptor (d. 1905)
- July 19 – Princess Augusta of Cambridge (d. 1916)
- July 20 – Gregor Mendel, Czech geneticist (d. 1884)
- July 21
- July 25 – Andrew Bryson, American admiral (d. 1892)
- August 27 – William Hayden English, American politician (d. 1896)
- October 4 – Rutherford B. Hayes, 19th President of the United States (d. 1893)
- October 6 – Benjamin F. Isherwood, American admiral, United States Navy Engineer-in-Chief (d. 1915)
- December 10 – César Franck, Belgian composer, organist (d. 1890)
- December 24 – Matthew Arnold, English poet (d. 1888)
- December 27 – Louis Pasteur, French microbiologist, chemist (d. 1895)
- January 10 – Bathilde d'Orléans, French princess (b. 1750)
- January 16 – Elisabeth Berenberg, German banker (b. 1749)
- January 21 – Marie-Aimée Lullin, Swiss entomologist (b. 1751)
- January 24 – Ali Pasha of Yanina, ruler of European Turkey (b. 1741)
- February 10 – Prince Albert of Saxony, Duke of Teschen (b. 1738)
- February 24 – Thomas Coutts, British banker (b. 1735)
- February 27 – John Borlase Warren, British admiral (b. 1753)
- April 14 – Edmund Butcher, English Unitarian minister (b. 1757)
- April 20 – Allegra Byron, illegitimate daughter of Lord Byron (b. 1817)
- May 17 – Armand-Emmanuel de Vignerot du Plessis, Duc de Richelieu, Prime Minister of France (b. 1766)
- May 27 – Augustus, Duke of Saxe-Gotha-Altenburg (b. 1772)
- June 25 – E. T. A. Hoffmann, German Romantic author (b. 1776)
- July 8 – Percy Bysshe Shelley, English poet (b. 1792)
- August 4 – Kristjan Jaak Peterson, Estonian poet (b. 1801)
- August 12 – Robert Stewart, Viscount Castlereagh, British foreign secretary (suicide) (b. 1769)
- August 25 – William Herschel, German-born English astronomer (b. 1738)
- September 8 – Sophie de Condorcet, politically active French salonist, feminist (b. 1764)
- October 26 – Mahmud Dramali Pasha, Ottoman vizier (b. c. 1780)
- October 31 – Jared Ingersoll, U.S. presidential candidate (b. 1749)
- November 24– Zofia Potocka, Greek-Polish noble and agent (b. 1760)
- date unknown
- ^ Dadrian, Vahakn N. (1999). Warrant for Genocide: Key Elements of Turko-Armenian Conflict. New Brunswick: Transaction Publishers. p. 153. ISBN 1560003898.
- ^ "The Republic of Liberia, Its Products and Resources", by Gerald Ralston, in The Nautical Magazine and Naval Chronicle (October 1862) p520
- ^ Rev. James Taylor, The Age We Live in: A History of the Nineteenth Century, from the Peace of 1815 to the Present Time (William Mackenzie Co., 1882) p286
- ^ Hyman, Anthony (1982). Charles Babbage: pioneer of the computer. Oxford University Press. p. 51ff. ISBN 0-19-858170-X.
- ^ Prebble, John (1988). The King's Jaunt: George IV in Scotland, August 1822 'One and Twenty Daft Days'. London: Collins. ISBN 0-00-215404-8.
- ^ Mungo Ponton, Earthquakes and Volcanoes: Their History, Phenomena, and Probable Causes (T. Nelson and Sons, 1870) pp223-225
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