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This article is about the year 1804.
|Centuries:||18th century – 19th century – 20th century|
|Decades:||1770s 1780s 1790s – 1800s – 1810s 1820s 1830s|
|Years:||1801 1802 1803 – 1804 – 1805 1806 1807|
|1804 in topic:|
|Archaeology – Architecture – Art – Literature – Music|
|Australia – Brazil - Canada – France – Germany – Mexico – Philippines – South Africa – United Kingdom – United States|
|Rail Transport – Science – Sports|
|Lists of leaders|
|Colonial Governors – State leaders|
|Birth and death categories|
|Births – Deaths|
|Establishments and disestablishments categories|
|Establishments – Disestablishments|
|French Republican calendar||12–13|
|Ab urbe condita||2557|
|British Regnal year||44 Geo. 3 – 45 Geo. 3|
|Chinese calendar||癸亥年 (Water Pig)
4500 or 4440
— to —
甲子年 (Wood Rat)
4501 or 4441
|- Vikram Samvat||1860–1861|
|- Shaka Samvat||1726–1727|
|- Kali Yuga||4905–4906|
|Japanese calendar||Kyōwa 3 / Bunka 1
|Julian calendar||Gregorian minus 12 days|
|Minguo calendar||108 before ROC
|Thai solar calendar||2346–2347|
|Wikimedia Commons has media related to 1804.|
- January 1 – Haiti gains independence from France and becomes the first black republic, having the only successful slave revolt ever.
- February 14 – The First Serbian Uprising begins as an intro into Serbian Revolution. By 1817, Principality of Serbia proclaims self-rule from Ottoman Empire, thus becoming the first nation-state in Europe.
- February 15 – New Jersey becomes the last northern state to abolish slavery.
- February 16 – First Barbary War: Stephen Decatur leads a raid to burn the pirate-held frigate USS Philadelphia at Tripoli to deny her further use by the captors.
- February 18 – Ohio University is chartered by the Ohio General Assembly.
- February 21 – The Cornishman Richard Trevithick's newly built Penydarren steam locomotive operates on the Merthyr Tramroad between Penydarren in Merthyr Tydfil and Abercynon in South Wales, following several trials since February 13, the world's first locomotive to work on rails.
- February – The 1804 Haiti Massacre, an ethnic cleansing, eradicates the white population on Haiti; it is not stopped until 22 April.
- March 7
- March 10 – Louisiana Purchase: In St. Louis, a formal ceremony is conducted to transfer ownership of Louisiana Territory from France to the United States.
- March 17 – First performance of Friedrich Schiller's play Wilhelm Tell, at Weimar under the direction of Johann Wolfgang von Goethe.
- March 21 – The Napoleonic Code is adopted as French civil law.
- April 2 – Forty merchantmen are wrecked when a convoy led by the HMS Apollo runs aground off Portugal.
- April 4 – Samuel Taylor Coleridge aboard The Speedwell sails to the Mediterranean
- April 5 – High Possil meteorite, the first recorded meteorite to fall in Scotland in modern times, falls at High Possil.
- April 26 – Henry Addington resigns as Prime Minister of the United Kingdom.
- May 10 – William Pitt the Younger begins his second term as Prime Minister of the United Kingdom.
- May 14 – The Lewis and Clark Expedition departs from Camp Dubois and begins their historic journey by traveling up the Missouri River.
- May 18 – Napoleon Bonaparte is proclaimed Emperor of the French by the French Senate.
- May 21 – Père Lachaise Cemetery a 118 acres (0.48 km2) cemetery in Paris, France is opened.
- June 9 – Beethoven's Symphony No. 3 in E–flat premiered in Vienna.
- June 15 – The Twelfth Amendment to the U.S. Constitution is ratified by New Hampshire, and arguably becomes effective (subsequently vetoed by the Governor of New Hampshire).
- July 11 – Alexander Hamilton is shot during a duel with Aaron Burr and dies the next day.
- July 27 – The Twelfth Amendment to the U.S. Constitution ratified by Tennessee, removing doubt surrounding adoption.
- August 20 – Lewis and Clark Expedition: The Corps of Discovery, whose purpose is to explore the Louisiana Purchase, suffers its only death when Sergeant Charles Floyd dies, apparently from acute appendicitis.
- September 1 – German astronomer K. L. Harding discovers the asteroid Juno.
- November 3 – The Treaty of St. Louis is signed by Quashquame and William Henry Harrison; controversy surrounding the treaty eventually causes the Sauk people to ally with the British during the War of 1812 and is the main cause of the Black Hawk War of 1832.
- November 20 – Said bin Sultan, Sultan of Muscat and Oman starts to rule.
- November 30 – The Democratic-Republican-controlled United States Senate begin an impeachment trial against Federalist-partisan Supreme Court of the United States Justice Samuel Chase on charges of political bias (he is acquitted by the United States Senate of all charges on March 1, 1805).
- December 2 – Coronation of Napoleon I: At the cathedral of Notre Dame de Paris, Napoleon crowns himself as the first Emperor of the French in a thousand years. Witnessing this, Simón Bolívar dedicates himself to liberating Venezuela from Spanish rule.
- December 3 – Thomas Jefferson defeats Charles C. Pinckney in the United States presidential election.
- December 12 – Spain declares war on Britain
- The Nguyễn dynasty emperor Gia Long changes his country's official name from Đại Việt to Việt Nam.
- Morphine is first isolated from the opium poppy by the German pharmacist, Friedrich Sertürner.
- Matthew Flinders recommends that New Holland be renamed Australia (from the Latin "australis" meaning "of the south").
- World population reaches 1 billion people.
- January 1 – James Fannin, Texas revolutionary (d. 1836)
- January 10 – Élie Frédéric Forey, Marshal of France (d. 1872)
- January 20 – Eugène Sue, French novelist (d. 1857)
- January 21 – Eliza Roxcy Snow, American poet (d. 1887)
- February 7 – John Deere, American industrialist (d. 1886)
- March 8 – Alvan Clark, telescope manufacturer (d. 1887)
- March 14 – Johann Strauss Senior, Austrian composer (d. 1849)
- March 17 – Jim Bridger, American trapper and explorer (d. 1881)
- March 20 – Neal S. Dow, mayor of Portland and Father of Prohibition (d. 1897)
- April 26 – Charles Goodyear, American politician (d. 1876)
- May 16 – Elizabeth Peabody, Transcendental activist, educator (d. 1894)
- June 1
- June 24 – Willard Richards, American religious leader (d. 1854)
- July 4 – Nathaniel Hawthorne, American writer (d. 1864)
- July 20 – Richard Owen, Anatomist, paleontologist, and zoologist (d. 1892)
- July 28 – Ludwig Feuerbach, German philosopher (d. 1872)
- September 8 – Eduard Mörike, German poet (d. 1875)
- September 14
- October 18 – Mongkut, Rama IV, King of Thailand (d. 1868)
- November 18 – Alfonso Ferrero La Marmora, Italian general and statesman (d. 1878)
- November 23 – Franklin Pierce, 14th President of the United States (d. 1869)
- December 10 – Carl Gustav Jacob Jacobi, German mathematician (d. 1851)
- December 13 – Joseph Howe, Canadian politician (d. 1873)
- December 21 – Benjamin Disraeli, Prime Minister of the United Kingdom (d. 1881)
- December 23 – Charles Augustin Sainte-Beuve, French literary critic (d. 1869)
- Eugénie Luce, French educator (d. 1882)
- James Mackay, Scottish-born New Zealand politician (d. 1875)
- Andrew Nicholl, Northern Irish painter (d. 1886)
- January 4 – Charlotte Ramsey Lennox, British author and poet (b. 1727)
- January 15 – Dru Drury, English entomologist (b. 1725)
- February 6 – Joseph Priestley, English chemist (b. 1733)
- February 12 – Immanuel Kant, German philosopher (b. 1724)
- March 3 – Giovanni Domenico Tiepolo, painter (b. 1727)
- March 16 – Henrik Gabriel Porthan Finnish writer and historian (b. 1739)
- March 21 – Louis Antoine, Duke of Enghien (executed) (b. 1772)
- March 30 – Victor-François, 2nd duc de Broglie, Marshal of France (b. 1718)
- April 9 – Jacques Necker, French statesman (b. 1732)
- April 11 – Miklós Küzmics, Hungarian Slovenes writer, Catholic priest (b. 1737)
- April 15 – Jean-Charles Pichegru, French general (strangled in prison) (b. 1761)
- July 12 – Alexander Hamilton, American statesman (killed in a duel) (b. 1755)
- September 4 – Richard Somers, American naval officer (killed in battle)
- October 2 – Nicolas-Joseph Cugnot, French steam vehicle pioneer (b. 1725)
- October 8 – Thomas Cochran (judge), Canadian judge (b. 1777)
- November 5 – Maria Anna Adamberger, actress (b. 1752)
- November 23 – Richard Graves, English writer (b. 1715)
- December 18 – Jacob ben Wolf Kranz, maggid (b. c. 1740)
- Rattenbury, Gordon; Lewis, M. J. T. (2004). Merthyr Tydfil Tramroads and their Locomotives. Oxford: Railway and Canal Historical Society. ISBN 0-901461-52-0.
- Penguin Pocket On This Day. Penguin Reference Library. 2006. ISBN 0-14-102715-0.
- "Our timeline". Bible Society. Retrieved 2010-11-26.
- "Luce Ben Aben School of Arab Embroidery I, Algiers, Algeria". World Digital Library. 1899. Retrieved 2013-09-26.