|Centuries:||18th century – 19th century – 20th century|
|Decades:||1790s 1800s 1810s – 1820s – 1830s 1840s 1850s|
|Years:||1823 1824 1825 – 1826 – 1827 1828 1829|
|1826 in topic:|
|Archaeology – Architecture – Art – Literature – Music|
|Australia – Brazil - Canada – Denmark - France – Germany – Mexico – Norway - Philippines - Portugal– Russia - South Africa – Spain - Sweden - 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|
|Ab urbe condita||2579|
|British Regnal year||6 Geo. 4 – 7 Geo. 4|
|Chinese calendar||乙酉年 (Wood Rooster)
4522 or 4462
— to —
丙戌年 (Fire Dog)
4523 or 4463
|- Vikram Samvat||1882–1883|
|- Shaka Samvat||1747–1748|
|- Kali Yuga||4926–4927|
|Japanese calendar||Bunsei 9
|Julian calendar||Gregorian minus 12 days|
|Minguo calendar||86 before ROC
|Thai solar calendar||2368–2369|
|Wikimedia Commons has media related to 1826.|
1826 (MDCCCXXVI) was a common year starting on Sunday (dominical letter A) of the Gregorian calendar and a common year starting on Friday (dominical letter C) of the Julian calendar, the 1826th year of the Common Era (CE) and Anno Domini (AD) designations, the 826th year of the 2nd millennium, the 26th year of the 19th century, and the 7th year of the 1820s decade. As of the start of 1826, the Gregorian calendar was 12 days ahead of the Julian calendar, which remained in localized use until 1918.
- January 15 – The French newspaper Le Figaro begins publication in Paris, initially as a weekly.
- January 30 – The Menai Suspension Bridge, built by engineer Thomas Telford, is opened between the island of Anglesey and the mainland of Wales.
- February 8 – Unitarian Bernardino Rivadavia becomes the first President of Argentina.
- February 11
- February 13 – The American Temperance Society is founded.
- February 24 – Treaty of Yandabo ends First Anglo-Burmese War, Britain gains Assam, Manipur, Rakhine and Tanintharyi.
- April 1 – Samuel Morey patents an internal combustion engine.
- April 10 – Third Siege of Missolonghi ends with the massacre of thousands of the Greek defenders by the Ottoman besiegers.
- May 28 – Pedro I of Brazil abdicates as King of Portugal.
- June – Photography: Nicéphore Niépce makes a true photograph.
- June 14–15 – The Auspicious Incident: Mahmud II, sultan of Ottoman Empire, crushes the last mutiny of janissaries in Istanbul.
- June 21 – Greek War of Independence: Attempted Ottoman–Egyptian invasion of Mani begins.
- June 22 – The Pan-American Congress of Panama tries (unsuccessfully) to unify the republics of the Americas.
- Early July – Ludwig van Beethoven puts the finishing touches on the String Quartet in C sharp Minor, Opus 131, the jewel in the crown of his late string quartets.
- July 4 – Former US Presidents Thomas Jefferson and John Adams both die on the 50th Anniversary of the signing of the United States Declaration of Independence.
- July 26 – The last auto-da-fé is held in Valencia.
- August – The town of Crawford Notch suffers a landslide. Those killed include the Willey family, after whom Mount Willey is named.
- August 10 – The first Cowes Regatta is held on the Isle of Wight in the UK.
- August 18 – Explorer Alexander Gordon Laing becomes the first European to reach Timbuktu.
- September 21 – Construction of the Rideau Canal begins in Canada.
- October 1 – Opening of the Monkland and Kirkintilloch Railway in Scotland.
- October 7 – The first train operates over the Granite Railway in Massachusetts.
- December 21 – Fredonian Rebellion: American settlers in Mexican Texas make the first attempt to secede from Mexico, establishing the Republic of Fredonia, which will survive for just over a month.
- December 25
- The Eggnog Riot breaks out at the United States Military Academy in West Point, New York during the early morning hours, but is squelched by Christmas chapel service.
- Major Edmund Lockyer arrives at King George Sound to take possession of the western part of Australia, establishing a settlement near Albany.
- The first railway tunnel is built en route between Liverpool and Manchester in England.
- The British East India Company colony of the Straits Settlements is established.
- Aniline is first isolated from the destructive distillation of indigo by Otto Unverdorben.
- Ludwig van Beethoven composes the Große Fuge.
- Mahmud II's council orders the janissaries to drill in the European manner.
- January 1 – Mikhail Loris-Melikov, Russian statesman and general (d. 1888)
- January 12 – William Chapman Ralston, banker and financier (d. 1875)
- January 26 – Louis Favre, Swiss engineer (d. 1879)
- January 27
- January 30 – Robert F. R. Lewis, American naval officer (d. 1881)
- February 7 – James Edward Jouett, American admiral (d. 1902)
- February 15 – George Johnstone Stoney, Anglo-Irish physicist (d. 1911)
- February 16
- March 4
- March 24 – Matilda Joslyn Gage, pioneering feminist (d. 1898)
- March 29 – Wilhelm Liebknecht, German journalist and politician (d. 1900)
- April 3 – Cyrus K. Holliday, cofounder of Topeka, Kansas, and first president of the Atchison, Topeka and Santa Fe Railway (d. 1900)
- April 6 – Gustave Moreau, French painter (d. 1898)
- April 26 – George Hull Ward, American general (d. 1863)
- May 3 – King Charles XV of Sweden and Norway (d. 1872)
- May 4 – Frederic Edwin Church, American painter (d. 1900)
- May 24 – Marie Goegg-Pouchoulin, Swiss national and international women's rights activist and pacifist (d. 1899)
- May 26 – Richard Christopher Carrington, English astronomer (d. 1875)
- June 24 – George Goyder, surveyor-general of South Australia (d. 1898)
- July 4
- July 31 – William S. Clark, American chemist and 3rd President of the Massachusetts Agricultural College
- August 7 – Samuel McLean, American congressman (d. 1877)
- August 11 – Andrew Jackson Davis, American cobbler (d. 1910)
- August 21 – Karl Gegenbaur, German anatomist and professor (d. 1903)
- September 17 – Bernhard Riemann, German mathematician (d. 1866)
- November 13 – Charles Frederick Worth, English couturier (d. 1895)
- November 24 – Carlo Collodi, Italian writer (d. 1890)
- November 27 – Jonathan Young, United States Navy commodore (d. 1885)
- December 3 – George B. McClellan, American general (d. 1885)
- William Daniel (politician), American temperance movement leader (d. 1897)
- Cetshwayo kaMpande, Zulu king (d. 1884)
- January 3 – Louis-Gabriel Suchet, French marshal (b. 1770)
- January 17 – Juan Crisóstomo Arriaga, Spanish composer (b. 1806)
- March 29 – Johann Heinrich Voss, German poet (b. 1751)
- April 25 – Karl Ludwig von Phull, German military leader (b. 1757)
- May 7 – Sophie Hagman, Swedish ballerina and royal mistress (b. 1758)
- May 16 – Elizabeth Alexeievna (Louise of Baden), Empress Consort of Russian Emperor Alexander I (b. 1779)
- May 16 – Joseph Holt, 1798 United Irish rebel general (b. 1756)
- June 3 – Nikolay Karamzin, reformer of the Russian language (b. 1766)
- June 5 – Carl Maria von Weber, German composer (b. 1786)
- June 7 – Joseph von Fraunhofer, German optician (b. 1787)
- July 4
- July 5 – Stamford Raffles, British colonial governor and founder of Singapore (b. 1781)
- July 8 – Luther Martin, delegate to the American Constitutional Convention (b. 1746)
- July 22 – Giuseppe Piazzi, Italian astronomer (b. 1746)
- August 13 – René Laennec, French physician (b. 1781)
- August 15 – Hanne Tott, Danish circus artist and circus manager (b. 1771)
- November 23 – Johann Elert Bode, German astronomer (b. 1747)
- "Icons, a portrait of England 1820-1840". Archived from the original on September 22, 2007. Retrieved 2007-09-12.
- Penguin Pocket On This Day. Penguin Reference Library. 2006. ISBN 0-14-102715-0.
- Awdry, Christopher (1990). Encyclopaedia of British Railway Companies. Wellingborough: Patrick Stephens Ltd. ISBN 1-85260-049-7.
- "Granite Railway". Britannica Online Encyclopedia. Retrieved 2008-05-19.
- "The First Railroad in America". Catskill Archive. Granite City B.P.O.E. - Quincy Lodge No. 943. 1924. Retrieved 2008-05-19.