1823 1824 1825 - 1826 - 1827 1828 1829
| Decades: |
1790s 1800s 1810s - 1820s - 1830s 1840s 1850s
| Centuries: |
18th century - 19th century - 20th century
List of state leaders in 1826
- February 11 - University College London is founded, under the name University of London.
- April 1 - Samuel Morey patents the internal combustion engine.
- June 14-15 – The Auspicious Incident: Mahmud II, sultan of Ottoman Empire, crushes the last mutiny of janissaries in Istanbul
- July 26 - Last auto de fe.
- September 3 - The USS Vincennes commanded by William Finch, leaves New York City to become first United States warship to circumnavigate globe.
- First railway tunnel built in route between Liverpool and Manchester in England
- Cholera epidemic begins in India
- Argentina becomes a federation
- The British crown colony of the Strait Settlements is established.
- January 12 - William Chapman Rawlston, banker and financier
- January 26 - Louis Favre, engineer Gotthard tunnel (d. 1879)
- February 16 - Joseph Victor von Scheffel, poet (d. 1886)
- February 16 - Julia Grant, First Lady, wife of President Ulysses S. Grant (d. 1902)
- March 29 - Wilhelm Liebknecht, journalist and politician (d. 1900)
- May 3 - King Charles XV of Sweden and Norway
- May 4 - Frederic Edwin Church, painter
- July 4 - Stephen Foster songwriter and poet, (d. 1864)
- November 13 - Charles Frederick Worth couturier (d. 1895)
- November 24 - Carlo Collodi, Italian writer, the creator of Pinocchio
- January 17 - Juan CrisÃ³stomo Arriaga, composer
- March 29 - Johann Heinrich Voß, German poet (b. 1751)
- July 4 - Thomas Jefferson, Third US President
- July 4 - John Adams, Second US President
- July 8 - Luther Martin, one of the Founding Fathers of the United States
- November 23 - Johann Elert Bode, German astronomer
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