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1830 (MDCCCXXX) was a common year starting on Friday of the Gregorian calendar and a common year starting on Wednesday of the Julian calendar, the 1830th year of the Common Era (CE) and Anno Domini (AD) designations, the 830th year of the 2nd millennium, the 30th year of the 19th century, and the 1st year of the 1830s decade. As of the start of 1830, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1923. It is known in European history as a rather tumultuous year with the Revolutions of 1830 in France, Belgium, Poland, Switzerland and Italy.
|Ab urbe condita||2583|
|Balinese saka calendar||1751–1752|
|British Regnal year||10 Geo. 4 – 1 Will. 4|
|Chinese calendar||己丑年 (Earth Ox)|
4526 or 4466
— to —
庚寅年 (Metal Tiger)
4527 or 4467
|- Vikram Samvat||1886–1887|
|- Shaka Samvat||1751–1752|
|- Kali Yuga||4930–4931|
|Japanese calendar||Bunsei 13 / Tenpō 1|
|Julian calendar||Gregorian minus 12 days|
|Minguo calendar||82 before ROC|
|Thai solar calendar||2372–2373|
1956 or 1575 or 803
— to —
1957 or 1576 or 804
|Wikimedia Commons has media related to 1830.|
- January 11 – LaGrange College (now the University of North Alabama) begins operation, becoming the first publicly chartered college in Alabama.
- January 12 – 27 – Webster–Hayne debate: Robert Y. Hayne of South Carolina debates the question of states' rights vs. federal authority with Daniel Webster of Massachusetts, in the United States Congress.
- January 13 – The Great Fire of New Orleans begins.
- February 3 – The London Protocol establishes the full independence and sovereignty of Greece from the Ottoman Empire, as the final result of the Greek War of Independence.
- February 5 – A fire destroys the Argyll Rooms in London, where the Philharmonic Society of London presents concerts, but firefighters are able to prevent its further spread by use of their new equipment, steam-powered fire engines.
- March 12 – Craig vs. Missouri: The United States Supreme Court rules that state loan certificates are unconstitutional, because they are bills of credit emitted by a state in violation of Article I, Section 10 of the Constitution.
- March 26 – The Book of Mormon is published in Palmyra, New York.
- March 28 – The Java War ends.
- April 6 – Joseph Smith and five others organize the Church of Christ (later renamed the Church of Jesus Christ of Latter Day Saints), the first formally organized church of the Latter Day Saint movement, in northwestern New York.
- May 13 – Ecuador separates from Gran Colombia.
- May 15 – The Royal Swedish Yacht Club (KSSS) is founded.
- May 28 – The United States Congress passes the Indian Removal Act, authorizing the President to negotiate with Native Americans in the United States for their removal from their ancestral homelands.
- June 26 – William IV succeeds his brother George IV, as King of Great Britain.
- July 5 – France invades Algeria (see French Algeria).
- July 11 – Uruguay adopts its present-day flag.
- July 13 – The General Assembly's Institution (now the Scottish Church College), one of the pioneering institutions that ushered in the Bengali renaissance, is founded by Alexander Duff and Raja Ram Mohan Roy, in Calcutta, India.
- July 17 – Barthélemy Thimonnier is granted a patent (#7454) for a sewing machine in France; it chains stitches at 200/minute.
- July 18 – Uruguay adopts its first constitution.
- July 20 – Greece grants citizenship to Romaniote Jews.
- July 27 – France: The July Revolution begins (see also 1830 in France).
- August 2 – Charles X of France abdicates the throne, in favor of his grandson Henry.
- August 9 – France: Louis Philippe becomes King of the French.
- August 13 – France: Duc de Broglie becomes Prime Minister.
- August 25 – The Belgian Revolution begins.
- August 31 – Edwin Beard Budding is granted a patent for the invention of the lawn mower.
- September 15 – The Liverpool and Manchester Railway opens, the world's first intercity passenger railway operated solely by steam locomotives.
- September 27 – The Belgian Revolution ends.
- October 4 – The Provisional Government in Brussels declares the creation of the independent state of Belgium, in revolt against the United Kingdom of the Netherlands.
- October – The Regeneration in Switzerland begins; more liberal constitutions are adopted in most cantons.
- November 2 – France: Jacques Laffitte succeeds the Duc de Broglie, as Prime Minister.
- November 8 – Ferdinand II becomes King of the Two Sicilies.
- November 22 – The Whig Charles Grey, 2nd Earl Grey succeeds Arthur Wellesley, 1st Duke of Wellington, as Prime Minister of the United Kingdom.
- November 29 – The Polish insurrection begins in Warsaw against Russian rule.
- December 5 – Hector Berlioz's most famous work, Symphonie fantastique, has its world premiere in Paris.
- December 20 – The independence of Belgium is recognized by the Great Powers.
- January 7 – Albert Bierstadt, German-American painter (d. 1902)
- January 21 – Liu Kunyi, Chinese general (d. 1902)
- January 23 – Gaston Alexandre Auguste, Marquis de Galliffet, French general (d. 1909)
- January 31 – James G. Blaine, 28th and 31st United States Secretary of State (d. 1893)
- February 3 – Robert Gascoyne-Cecil, 3rd Marquess of Salisbury, Prime Minister of the United Kingdom (d. 1903)
- February 8 – Abdülaziz, Ottoman Sultan (d. 1876)
- February 16 – Lars Hertervig, Norwegian painter (d. 1902)
- March 15 – Paul Heyse, German writer, Nobel Prize laureate (d. 1914)
- March 30 – Mihály Zsupánek Slovene writer, poet and soldier in Hungary (d. 1898? 1905)
- May 5 – John Batterson Stetson, American hat maker (d. 1906)
- May 9 – Harriet Lane, Acting First Lady of the United States (d. 1903)
- May 10 – François-Marie Raoult, French chemist (d. 1901)
- May 14 – Antonio Annetto Caruana, Maltese archaeologist, author (d. 1905)
- May 29 – Louise Michel, French anarchist (d. 1905)
- April 9 – Eadweard Muybridge, English photographer, pioneer of photographic studies of motion (d. 1904)
- April 19 – Pierre Paul Dehérain, French chemist, botanist (d. 1902)
- April 21 – Clémence Royer, French anthropologist (d. 1902)
- June 1 – Martha Hooper Blackler Kalopothakes, American missionary, journalist, translator (d. 1871)
- June 5 – Carmine Crocco, Italian brigand (d. 1905)
- June 22 – Theodor Leschetizky, Polish pianist, professor and composer (d. 1915)
- July 8 – Frederick W. Seward, American politician (d. 1915)
- July 10 – Camille Pissarro, French painter (d. 1903)
- July 20 – Fanny Janauschek, Czech-born actress (d. 1904)
- July 21 – John H. Lewis, American politician (d. 1929)
- July 22 – William Sooy Smith, American civil engineer and general (d. 1816)
- July 25 – John Jacob Bausch, German-American optician who co-founded Bausch & Lomb (d. 1926)
- August 18 – Emperor Franz Joseph I of Austria (d. 1916)
- August 26 – Daniel Webster Jones, American Latter-day Saint pioneer (d. 1915)
- September 2 – William P. Frye, American politician (d. 1911)
- September 8 – Frédéric Mistral, French writer, Nobel Prize laureate (d. 1914)
- September 12 – William Sprague IV, American politician from Rhode Island (d. 1915)
- September 15 – Porfirio Díaz, 29th President of Mexico (d. 1915)
- September 17 – Maria Theresia Bonzel, German Roman Catholic nun and saint (d. 1905)
- September 20 – Edward James Reed, British naval architect, author, politician, and railroad magnate (d. 1906)
- September 22 – Caroline Webster Schermerhorn Astor, prominent American socialite (d. 1908)
- October 10 – Queen Isabella II of Spain (d. 1904)
- November 7 – Emanuele Luigi Galizia, Maltese architect, civil engineer (d. 1907)
- November 22 – Karl Christian Bruhns, German astronomer (d. 1881)
- December 5 – Christina Rossetti, English poet (d. 1894)
- December 10 – Emily Dickinson, American poet (d. 1886)
- December 16 – Kálmán Tisza, 9th Prime Minister of Hungary (d. 1902)
- December 17 – Jules de Goncourt, French writer (d. 1870)
- December 21 – Bartolomé Masó, Cuban patriot (d. 1907)
- January 7
- January 19 – Johann Schweighäuser, German classical scholar (b. 1742)
- January 25 – Benito de Soto, Galician pirate (b. 1805)
- February 2 – Manoel da Costa Ataíde, Brazilian painter (b. 1762)
- February 22 – William Badger, master shipbuilder (b. 1752)
- February 23 – Jean-Pierre Norblin de La Gourdaine (Jan Piotr Norblin), French-born Polish painter (b. 1740)
- March 2 – Samuel Thomas von Sömmerring, German physician, anatomist (b. 1755)
- March 7 – Jacques Villeré, first Creole governor of Louisiana (b. 1761)
- March 16 – Sir Robert Farquhar, British merchant, colonial governor and politician (b. 1776)
- March 17 – Laurent de Gouvion Saint-Cyr, French marshal (b. 1764)
- April 14 – Erike Kirstine Kolstad, Norwegian actress (b. 1792)
- June 1 – Swaminarayan (Sahajanand Swami), Indian yogi, central figure in Swaminarayan Hinduism (b. 1781)
- June 4 – Antonio José de Sucre, Venezuelan revolutionary leader, statesman (b. 1795)
- June 26 – King George IV of the United Kingdom (b. 1762)
- August 6 – David Walker, African-American abolitionist (b. 1796)
- August 24 – Louis Jean Pierre Vieillot, French ornithologist (b. 1748)
- September 18 – William Hazlitt, English essayist (b. 1778)
- September 23
- October 4 – Ludwig Yorck von Wartenburg, Prussian military leader (b. 1759)
- October 5 – Dinicu Golescu, Romanian writer (b. 1777)
- October 31 – Petar I Petrović-Njegoš, ruler of Montenegro (b. 1747)
- November 8 – Francis I of the Two Sicilies (b. 1777)
- November 18 – Adam Weishaupt, German philosopher (b. 1748)
- November 30 – Pope Pius VIII, Italian pontiff (b. 1761)
- December 6 – Morton Eden, 1st Baron Henley, British diplomat (b. 1752)
- December 8 – Benjamin Constant, Swiss writer (b. 1767)
- December 17 – Simón Bolívar, Venezuelan revolutionary leader, statesman (b. 1783)
- "Fires, Great", in The Insurance Cyclopeadia: Being an Historical Treasury of Events and Circumstances Connected with the Origin and Progress of Insurance, Cornelius Walford, ed. (C. and E. Layton, 1876) p72
- https://www.fws.gov/bisonrange/timeline.htm Timeline of American Bison