|Centuries:||18th century – 19th century – 20th century|
|Decades:||1790s 1800s 1810s – 1820s – 1830s 1840s 1850s|
|Years:||1824 1825 1826 – 1827 – 1828 1829 1830|
Year 1827 (MDCCCXXVII) was a common year starting on Monday (link will display the full calendar) of the Gregorian Calendar (or a common year starting on Saturday of the 12-day slower Julian calendar).
- Also see: List of years in Art.
Events of 1827
January - June
- February 20 - South America: Battle of Ituzaingo or Passo do Rosário - A force of the Brazilian Imperial Army meets Argentinean- Uruguayan troops in combat.
- February 28 - The Baltimore & Ohio Railroad is incorporated, becoming the first railroad in America offering commercial transportation of both people and freight.
- March 7 - Brazilian marines sail up the Rio Negro and attack the temporary naval base of Carmen de Patagones, Argentina. They are defeated by the local citizens.
- March 7 - Shrigley Abduction: Ellen Turner, a wealthy heiress in Cheshire, England, is abducted by Edward Gibbon Wakefield, the future politician in colonial New Zealand.
- March 16 - Freedom's Journal, the first African-American owned and published newspaper in the United States, is founded in New York City by John Russwurm.
- April - Ottoman Algeria: Husain Dei slaps the French consul Decalina on the face, eventually leading to war and French rule in Algeria.
- April 7- 8 - Battle of Monte Santiago: Naval engagement between a squadron of the Brazilian Imperial Navy and Argentinean vessels. Major Brazilian victory.
- April 10 - UK: George Canning succeeds Lord Liverpool as British Prime Minister.
- April 24 - Greek War of Independence: The Battle of Phaleron is fought.
- May 21 - The Maryland Democratic Party is founded by supporters of Andrew Jackson in Baltimore and hosts its first meeting at the Baltimore Atheneum.
July - December
- July 6 - Greek War of Independence: The Treaty of London between France, Britain, and Russia, demands that the Turks agree to an armistice in Greece.
- July 14 - Kingdom of Hawaii: Diocese of Honolulu founded.
July 14-Augustin-Jean Fresnel dies
- August 31 - UK: Frederick John Robinson, 1st Viscount Goderich, becomes Prime Minister of the UK, following the death of George Canning.
- September 4 - Finland: Great Fire of Turku.
- September 22 - Joseph Smith Jr. obtains the Book of Mormon, for him to translate.
- October 1 - Russo-Persian War, 1826-1828: The Russians under Ivan Paskevich storm Yerevan, ending a millennium of Muslim domination in Eastern Armenia.
- October 20 - Greek War of Independence: Battle of Navarino - British, French, and Russian naval forces destroy the Turko-Egyptian fleet in Greece.
- Laos: King Anouvong of Vientiane declares war on Siam and successfully attacks Nakhon Ratchasima (the Siamese later invade Vientiane and nearly destroy the whole city).
- Englishman John Walker invents the first friction match which he names Lucifer.
- Egypt: Cairo University School of Medicine is established as the first African medical school in the Middle East.
|Ab urbe condita||2580|
|British Regnal year||7 Geo. 4 – 8 Geo. 4|
|Chinese calendar|| 丙戌年十二月初四日
— to —丁亥年十一月十四日
|- Vikram Samvat||1883–1884|
|- Shaka Samvat||1749–1750|
|- Kali Yuga||4928–4929|
|- Ǹrí Ìgbò||827–828|
|Japanese calendar|| Bunsei 10
|Juche calendar||N/A (before 1912)|
|Julian calendar||Gregorian minus 12 days|
|Minguo calendar||85 before ROC
|Thai solar calendar||2370|
- March 8 - Wilhelm Bleek, German linguist (d. 1875)
- April 5 - Joseph Lister, English surgeon (d. 1912)
- April 8 - Ramón Emeterio Betances, Puerto Rican politician, medical doctor and diplomat (d. 1898)
- May 11 - Jean-Baptiste Carpeaux, French sculptor and painter (d. 1875)
- May 19 - Paul-Armand Challemel-Lacour, French statesman (d. 1896)
- May 21 - William P. Sprague, American politician from Ohio (d. 1899)
- May 27 - Samuel F. Miller, American politician (d. 1892)
- June 12 - Johanna Spyri, Swiss author (d. 1901)
- July 13 - Hugh O'Brien, Mayor of Boston (d. 1895)
- July 17 - Sir Frederick Augustus Abel, British chemist (d. 1902)
- September 30 - Ellis H. Roberts, American politician (d. 1918)
- November 10 - J.T. Wamelink, American composer (d. 1910)
- November 26 - Ellen G. White, American religious leader (d. 1915)
- 3 December- Jain Acharya Rajendrasuri, religious reformer (d. 1906)
- January 5 - Prince Frederick, Duke of York and Albany, Heir-Presumptive to the British Throne. (b. 1763)
- February 19 - Armand Augustin Louis de Caulaincourt, French general and diplomat (b. 1773)
- March 5
- Pierre-Simon Laplace, French mathematician (b. 1749)
- Alessandro Volta, Italian physicist (b. 1745)
- March 26 - Ludwig van Beethoven, German composer (b. 1770)
- May 27 - Melesina Trench, Irish born writer and socialite (b. 1768)
- April 29- Deborah Sampson, first American female soldier (b.1760)
- August 8 - George Canning, Prime Minister of the United Kingdom (b. 1770)
- August 12 - William Blake, English poet and artist (b. 1757)
- November 7 - Maria Theresia of Tuscany, Queen of Saxony (b. 1767)
- December 3 - Servando Teresa de Mier, preacher (b. 1765)