1823

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December 2: The Monroe Doctrine is introduced by U.S. President James Monroe.

August 18: The Demerara rebellion of 1823 is started by 10,000 black slaves in British Guiana.

April 7: The "Hundred Thousand Sons of Saint Louis", a French infantry force, begin an attack on Spain that lasts until November.

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Events

January–March

January 22 – By secret treaty signed at the Congress of Verona, the Quintuple Alliance gives France a mandate to invade Spain for the purpose of restoring Ferdinand VII (who has been captured by armed revolutionary liberals) as absolute monarch of the country.
January 23 – In Paviland Cave on the Gower Peninsula of Wales, William Buckland inspects the "Red Lady of Paviland", the first identification of a prehistoric (male) human burial (although Buckland dates it as Roman).<ref>Template:Cite journal</ref>
February 3
- Jackson Male Academy, precursor of Union University, opens in Tennessee.
- Gioachino Rossini's opera Semiramide is first performed, at La Fenice in Venice.
February 10 – The first worldwide carnival parade takes place in Cologne, Prussia.
February 11 – Carnival tragedy of 1823: About 110 boys are killed during a stampede at the Convent of the Minori Osservanti in Valletta, Malta.
February 15 (approx.) – The first officially recognised gold is found in Australia, by surveyor James McBrien at Fish River, near Bathurst, New South Wales, predating the Australian gold rushes.
February 20 – Explorer James Weddell's expedition to Antarctica reaches latitude 74°15' S and longitude 34°16'45" W: the southernmost position any ship has reached at this time.
March 15 – Sailor Benjamin Morrell erroneously reports the existence of the island of New South Greenland near Antarctica.<ref>Template:Cite book</ref>
March 19 – Emperor Agustín de Iturbide of Mexico abdicates, thus ending the short-lived First Mexican Empire.

April–June

April 7 – French forces, the "Hundred Thousand Sons of Saint Louis", cross the Spanish border at the Bidasoa River
April 10 – Siege of Pamplona begins in Navarre as French troops besiege the city's garrison
April 13 – Franz Liszt, 11, gives a concert in Vienna, after which he is personally congratulated by Ludwig van Beethoven.<ref>According to Gustav Schilling.</ref>
May 5 – Emperor Pedro I of Brazil inaugurates Brazil's first Assembleia Geral, with 50 Senators and 102 Deputies.<ref>Template:Cite book</ref>
May 7 – Mikhail Semyonovich Vorontsov in appointed as Governor-General of Novorossiya (New Russia), the portion of Russian Empire bordering the Black Sea (in modern days it constitutes southern regions of Ukraine).<ref>"Mikhail Semyonovich Vorontsov", in Encyclopædia Britannica 28 (1910) p. 213.</ref>
May 9 – Russian author Alexander Pushkin begins work on his verse novel Eugene Onegin.<ref>Template:Cite book</ref>
May 23 – The rebel Spanish government withdraws from Madrid to Seville following the French advance
May 25
- The Duke of Angoulême, commander of the invading French forces, establishes a regency in Madrid on behalf of Ferdinand VII who remains a captive of the Spanish government
- The Catholic Association, a campaign for religious emancipation, begins in Ireland at a meeting of 13 people at a bookseller's house on Capel Street in Dublin.<ref>Robert Huish, The Memoirs Private and Political of Daniel O'Connell, Esq., M.P., His Times and Contemporaries (W. Johnston, 1836) p129</ref>
June 5 – Raffles Institution is established (as the Singapore Institution) by the founder of Singapore, Sir Stamford Raffles.

July–September

July 1 – The Congress of Central America declares absolute independence from Spain, Mexico and any other foreign nation, including North America, and a republican system of government is established.
July 4 – Royal assent is given to several significant Acts of Parliament in the United Kingdom, after the Home Secretary (and future Prime Minister) Robert Peel had worked to get approval by Parliament. Approved are the Judgment of Death Act 1823, effectively abolishing the death penalty for over 100 offences and ;<ref name=CBH>Template:Cite book</ref> allowing judges to commute sentences for capital offences (other than murder or treason) to imprisonment or transportation.;<ref>Template:Cite web</ref> the Transportation Act allowing convicts transported to the colonies to be employed on public works.<ref name=CBH/> On July 10, the Gaols Act 1823 is given assent, beginning the process of prison reform based on the campaign of Elizabeth Fry.<ref name=CBH/>
July 15 – The Basilica of Saint Paul Outside the Walls in Rome is almost completely destroyed by fire.<ref name=Fires>"Fires, Great", in Walford, Cornelius, ed. The Insurance Cyclopeadia: Being an Historical Treasury of Events and Circumstances Connected with the Origin and Progress of Insurance. C. & E. Layton, 1876. p.71.</ref>
July 28 – The first theatrical adaptation of the Frankenstein story, Presumption; or, the Fate of Frankenstein, opens at the Royal Opera House, Covent Garden in London. On August 29, Mary Shelley attends a performance, the only version of her novel she will ever see.<ref>Template:Cite web</ref>
August 1 – William Pitt Amherst arrives in Calcutta with Lady Amherst to become the new Governor-General of India.<ref>The Cambridge Modern History, Volume 11 (Macmillan, 1909) p727.</ref>
August 4 – Felipe Enrique Neri, Baron de Bastrop, the Mexican government administrator in charge of Anglo-American immigration into Mexico's state of Coahuila y Tejas, allows Stephen F. Austin to put together an 11-man police force, that will later be expanded to become the Texas Ranger Division.<ref>Robert M. Utley, Lone Star Justice: The First Century of the Texas Rangers (Oxford University Press, 2002)</ref>
August 5 – The Royal Hibernian Academy is founded in Dublin.<ref>Template:Cite book</ref>
August 16 – Tsar Alexander I of Russia draws up a secret "manifesto", designating his second younger brother Nikolai to succeed him, bypassing Nikolai's older brother, Grand Duke Konstantin. The existence of the manifesto is revealed on Alexander's death in 1825.<ref>Donald J. Raleigh and A.A. Iskenderov, The Emperors and Empresses of Russia: Reconsidering the Romanovs (Routledge, 2015)</ref>
August 18 – Demerara rebellion of 1823: In the British colony of Demerara-Essequibo (modern-day Guyana in South America), an insurrection of 10,000 black slaves begins; it is suppressed after three days, but hundreds of suspects are executed in the reprisals that follow.<ref>Gelien Matthews, Caribbean Slave Revolts and the British Abolitionist Movement (LSU Press, 2006) p21</ref>
August 20 – Pope Pius VII dies after a reign of more than 23 years that began on March 14, 1800; he is remembered for crowning Napoleon Bonaparte as Emperor of France.<ref name=Coulombe>Charles A. Coulombe, Vicars of Christ: A History of the Popes (Citadel Press, 2003) pp393-397</ref>
August 24 – Hugh Glass gets mauled by a sow grizzly while on a fur trapping expedition in the Missouri Territory and has to crawl 200 miles for help.<ref>As featured in the 2002 novel The Revenant and 2015 film of the same title.</ref>
August 31 – Battle of Trocadero: French infantry of the "Hundred Thousand Sons of Saint Louis" capture the fort of Trocadero and turn its guns on Cádiz.
September 10 – Simón Bolívar is named President of Peru.
September 17 – Pamplona surrenders to French forces after a five-month siege.
September 22 – Joseph Smith first goes to the place near Manchester, New York, where the golden plates are stored, having been directed there by God through an angel (according to what he writes in 1838).
September 23 – First Anglo-Burmese War: Burmese forces attack the British on Shapura, an island close to Chittagong.
September 28 – Roman Catholic Cardinal Annibale della Genga is elected Pope Leo XII.<ref name=Coulombe/>
September 30 – Cádiz surrenders to the French and Ferdinand VII of Spain is restored to his throne, immediately repealing the liberal Spanish Constitution of 1812. Despite French advice, he begins an era of repression against his opponents known as the Ominous Decade

October–December

October 5 – The Lancet medical journal is founded by Thomas Wakley in London.
October 22 – Simón Bolívar writes to Paraguayan dictator José Gaspar Rodríguez de Francia to release his friend the explorer Aimé Bonpland under threat of invasion. Rodríguez never responds to the letter.
November 3 – An explosion at the Rainton Colliery Company's Plain Pit mine at Chilton Moor in the north-east of England, kills at least 57 coal miners.<ref>Template:Cite book</ref>
November 7 – General Rafael del Riego is executed in Madrid for high treason
November – According to tradition, William Webb Ellis invents the sport of rugby football at Rugby School in England.<ref name=CBH/>
December 2 – James Monroe first introduces the Monroe Doctrine in the State of the Union address, declaring that any European attempts to recolonize the Americas would be considered a hostile act towards the United States.

Undated

The first Anglo-Ashanti War begins.
British expedition up the St. Clair River; site of Corunna surveyed as a potential capital for Upper Canada.<ref>Template:Cite web</ref>
Olbers' paradox is described by the German astronomer Heinrich Wilhelm Olbers.
Work begins on the British Museum in London, designed by Robert Smirke, and the Altes Museum in Berlin, designed by Karl Friedrich Schinkel.
The Oxford Union is founded as a student debating society in England.

Births

January–June

File:Wilhelm Siemens.jpg

Carl Wilhelm Siemens

File:Sultan Abdülmecid - Google Art Project.jpg

Abdülmecid I

January 1 – Sándor Petőfi, Hungarian poet, revolutionary (d. 1849)
January 3 – Robert Whitehead, English engineer, inventor (d. 1905)
January 8 – Alfred Russel Wallace, British naturalist, biologist (d. 1913)
January 11 – Pierre Philippe Denfert-Rochereau, French military officer and politician (d. 1878)
January 27 – Édouard Lalo, French composer (d. 1892)
February 15 – Li Hongzhang, Chinese politician, general and diplomat (d. 1901)
February 28
- Frederick Francis II, Grand Duke of Mecklenburg-Schwerin (d. 1883)
- Ernest Renan, French philosopher, philologist, historian and writer (d. 1892)
March 3 – John George Adair, Scots-Irish businessman and landowner; also known as "Black Jack" for his eviction of 244 people in 1861; financier of JA Ranch (d. 1885)
March 8 – Gyula Andrássy, 4th Prime Minister of Hungary (d. 1890)
March 14 – Théodore de Banville, French writer (d. 1891)
March 18 – Antoine Chanzy, French general and colonial governor (d. 1883)
April 1 – Simon Bolivar Buckner, American soldier, politician and Confederate soldier (d. 1914)
April 3 – William M. Tweed, American political boss (d. 1878)
April 4 – Carl Wilhelm Siemens, German engineer (d. 1883)
April 24 – Sebastián Lerdo de Tejada, 27th President of Mexico (d. 1889)
April 25 – Abdülmecid I, Ottoman Sultan (d. 1861)
May 2 – Emma Hardinge Britten (b. Emma Floyd), English-born spiritualist (d. 1899)
May 9 – Sir Frederick Weld, 6th Prime Minister of New Zealand (d. 1891)
May 15
- Thomas Lake Harris, American poet (d. 1906)
- Youssef Bey Karam, Lebanese nationalist leader (d. 1889)<ref>Template:Cite web</ref>
May 17 – Henry Eckford, British horticulturist (d. 1905)
May 22 – Solomon Bundy, American politician (d. 1889)
May 26 – William Pryor Letchworth, American businessman, philanthropist, founder of Letchworth State Park, New York
July 6 – Sophie Adlersparre, Swedish feminist (d. 1895)
June 21 – Jean Chacornac, French astronomer (d. 1873)

July–December

File:Max Muller.jpg

Max Müller

File:SirMackenzieBowell.jpg

Mackenzie Bowell

July 9 (date uncertain) – Phineas Gage, improbable American head injury survivor (d. 1860)
July 18
- Félix du Temple de la Croix, French Army Captain, aviation pioneer (d. 1890)
- Leonard Fulton Ross, American Civil War general (d. 1901)
July 23 – Coventry Patmore, English poet (d. 1896)
August 3 – Thomas Francis Meagher, American Civil War general (d. 1867)
August 4 – Oliver P. Morton, American politician (d. 1877)
August 5 – Eliza Tibbets, mother of the California orange industry (d. 1898)
August 10
- Hugh Stowell Brown, Manx preacher (d. 1886)
- Charles Keene, English artist, illustrator (d. 1891)
August 11 – Charlotte Mary Yonge, English author (d. 1901)
August 13 – Goldwin Smith, English historian (d. 1910)
August 14 – Karel Miry, Belgian composer (d. 1889)
August 15 – Orris S. Ferry, American Civil War general and politician (d. 1875)
August 23 – Nil Izvorov, Bulgarian Orthodox priest and venerable (d. 1905)
September 16 – Ludwik Teichmann, Polish anatomist (d. 1895)
September 28 – Alexandre Cabanel, French painter (d. 1889)
November 1 – Lascăr Catargiu, 4-time prime minister of Romania (d. 1899)
November 8 – Joseph Monier, French inventor (d. 1906)
November 16 – Henry G. Davis, American politician (d. 1916)
November 18 – Charles H. Bell, American politician (d. 1893)
November 21 – Andrzej Jerzy Mniszech, Polish painter (d. 1905)
November 25 – Henry Wirz, Swiss-born American Confederate military officer, prisoner-of-war camp commander (d. 1865)
December 6 – Friedrich Max Müller, German-born Orientalist (d. 1900)
December 9 – Rosalie Olivecrona, Swedish women's rights activist (d. 1898)
December 13 – Ferdinand Büchner, German composer (d. 1906)
December 22 – Thomas Wentworth Higginson, American Unitarian minister, abolitionist (d. 1911)
December 27 – Sir Mackenzie Bowell, 5th Prime Minister of Canada (d. 1917)