| in?=
| cp=18th century
| c=19th century
| cf=20th century
| yp1=1800
| yp2=1801
| yp3=1802
| year=1803
| ya1=1804
| ya2=1805
| ya3=1806
| dp3=1770s
| dp2=1780s
| dp1=1790s
| d=1800s
| dn1=1810s
| dn2=1820s
| dn3=1830s
}}
1803 was a Common Year Starting On Saturday (see link for calendar).
Events
- January 4 - William Symington demostrates his '' Charlotte Dundas '', the "first practical steamboat".
- January 30 - Monroe and Livingston sail for Paris to discuss, and possibly buy, New Orleans . They end completing the Louisiana Purchase .
- February 21 - Edward Despard and six others are hanged, drawn and quartered for plotting to Assassinate king George III and to destroy the Bank Of England
- February 24 - The Supreme Court Of The United States , in '' Marbury V. Madison '', establishes the principle of Judicial Review .
- March 1 - Ohio is admitted as the 17th U.S. State , retroactive from August 7 , 1953 .
- April 30 - Louisiana Purchase made by the United States from France .
- March 12 - Port Gibson, MS is chartered
- May 18 - The United Kingdom redeclares war on France after France refused to withdraw from Dutch territory.
- July 4 - The Louisiana Purchase is announced to the American people.
- July 5 - The Convention Of Artlenburg leads to the French occupation of Hanover (which had been ruled by the British king).
- July 23 - Robert Emmet 's uprising in Ireland begins
- July 26 - The Wagonway between Wandsworth and Croydon is opened, being the first public railway line of the world.
- August 3 – British begin Second Anglo-Maratha War against Sindhia of Gwalior
- September 20 - Irish rebel Robert Emmet is executed
- September 23 - The Battle Of Assaye in India – British-lead troops defeat Maratha forces
- October 20 - Senate ratifies the Louisiana Purchase Treaty, doubling the size of the United States.
- November 30 - At the Cabildo building in New Orleans , Spanish representatives Governor Manuel De Salcedo and the Marqués De Casa Calvo , officially transfer Louisiana Territory to French representative Prefect Pierre Clément De Laussat (just 20 days later, France had transferred the same land to the United States as the Louisiana Purchase ).
Ongoing events
Births
- February 2 - Albert Sidney Johnston , American Confederate general (d. 1862 )
- February 15 - John Sutter , American pioneer (d. 1880 )
- April 7 - Flora Tristan , French feminist (d. 1844 )
- April 30 - Albrecht Graf Von Roon , Prime Minister Of Prussia (d. 1879 )
- May 12 - Justus Von Liebig , German chemist (d. 1873 )
- May 24 - Charles Lucien Bonaparte , French naturalist and ornithologist (d. 1857 )
- May 25 - Edward George Bulwer-Lytton , English novelist and playwright (d. 1873 )
- May 25 - Ralph Waldo Emerson , American writer (d. 1882 )
- June 24 - George James Webb , English-born composer (d. 1887 )
- July 24 - Adolphe Charles Adam , French composer (d. 1856 )
- July 31 - John Ericsson , Swedish inventor and engineer (d. 1889 )
- September 4 - Sarah Childress Polk , First Lady Of The United States (d. 1891 )
- September 27 - Samuel Francis Du Pont , American admiral (d. 1865 )
- September 28 - Prosper Mérimée , French writer (d. 1870 )
- November 14 - Jacob Abbott , American writer (d. 1879 )
- November 29 - Christian Doppler , Austrian mathematician (d. 1853 )
- December 11 - Hector Berlioz , French composer (d. 1869 )
Deaths
- January 18 - Ippolit Bogdanovich , Russian poet (b. 1743 )
- January 23 - Arthur Guinness , Irish brewer (b. 1725 )
- February 9 - Jean François De Saint-Lambert , French poet (b. 1716 )
- February 18 - Johann Wilhelm Ludwig Gleim , German poet (b. 1719 )
- February 20 - Marie Dumesnil , French actress (b. 1713 )
- March 14 - Friedrich Gottlieb Klopstock , German poet (b. 1724 )
- April 2 - Sir James Montgomery, 1st Baronet , Scottish politician and judge (b. 1721 )
- April 7 - Toussaint L'Ouverture , Haitian revolutionary (b. 1743 )
- June 24 - Matthew Thornton , American signer of the Declaration of Independence (b. 1714 )
- September 5 - Pierre Choderlos De Laclos , French general and author (b. 1741 )
- September 15 - Gian Francesco Albani , Italian Catholic cardinal (b. 1719 )
- October 2 - Samuel Adams , American revolutionary leader (b. 1722 )
- October 26 - Granville Leveson-Gower, 1st Marquess Of Stafford , English politician (b. 1721 )
- November 23 - Roger Newdigate , English politician (b. 1719 )
- December 18 - Johann Gottfried Herder , German philosopher and writer (b. 1744 )
- December 30 - Francis Lewis , American signer of the Declaration of Independence (b. 1713 )
- Jacques-Donatien Le Ray , French "Father of the American Revolution" (b. 1726 )
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