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. (November 2015)
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was a leap year starting on Tuesday of the Gregorian calendar and a leap year starting on Sunday of the Julian calendar, the 1828th year of the Common Era (CE) and Anno Domini (AD) designations, the 828th year of the 2nd millennium, the 28th year of the 19th century, and the 9th year of the 1820s decade. As of the start of 1828, the Gregorian calendar was
12 days ahead of the Julian calendar, which remained in localized use until 1923.
- January 4 – Jean Baptiste Gay, vicomte de Martignac succeeds the Comte de Villèle, as Prime Minister of France.
- January 8 - The Democratic Party of the United States is organized.
- January 22 – Arthur Wellesley, 1st Duke of Wellington succeeds Lord Goderich as Prime Minister of the United Kingdom.
- February 19 – The Boston Society for Medical Improvement is established in the United States.
- February 21 – The first American-Indian newspaper in the United States is published, named "Cherokee Phoenix".
- February 22 – Treaty of Turkmenchay: By this Russian-Persian peace treaty signed on February 10 at Torkamanchay, Persia (Iran), the latter country is forced irrevocably to cede the territories of the Erivan Khanate (most of present-day central Armenia and the northern Iğdır Province of Turkey), the Nakhichevan Khanate (most of the modern-day Nakhchivan Autonomous Republic of Azerbaijan), the remainder of the Talysh Khanate (southeastern Azerbaijan), and the Ordubad and Mughan regions (also part of modern-day Azerbaijan) to Imperial Russia. By this and the Treaty of Gulistan (1813) it has now lost all its territories north of the Aras River, comprising modern-day Georgia, Dagestan, Azerbaijan and Armenia to Russia. Armenians from Persian Azerbaijan are to be resettled in the Caucasus.
- March 3 – Dom Pedro I, Emperor of Brazil and former King of Portugal, signs a document "to complete my abdication of the Portuguese crown" (made in 1826), to renounce all claims in favor of his daughter Queen Maria II, and to declare "indubitable proof" that he wishes Portugal to be "perpetually separated from the Brazilian nation....in such a manner as may render even the idea of reunion impracticable." 
- March 18 – Simón Bolívar, President of Colombia (and former President of Venezuela, Peru and Bolivia), departs from the capital at Bogotá, in order to help his ally, General José Antonio Páez, suppress an uprising near the Venezuelan border, but is sidetracked by another rebellion in Cartagena. 
- October 26 – English naturalist and explorer William John Burchell collects the only known specimen of Parabouchetia brasiliensis, an exceptionally rare member of the nightshade family Solanaceae, in central Brazil.
- November 11 – Greek War of Independence: the London Protocol entails the creation of an autonomous Greek state under Ottoman suzerainty, encompassing the Morea and the Cyclades.
- November 12 – Anouvong, ruler of the Kingdom of Vientiane, is deposed and the kingdom is annexed by Siam. During the war, the city of Vientiane is obliterated by Siamese forces.
- December 1 – Decembrist revolution (Argentina): Juan Lavalle, returning to Buenos Aires with troops that fought in the Cisplatine War, deposes the provincial governor Manuel Dorrego, reigniting the Argentine Civil Wars.
- December 3 – United States presidential election, 1828: Andrew Jackson is elected President of the United States, defeating incumbent John Quincy Adams in a landslide.
- December 28 The province of Echigo, Japan is hit by a 6.8 magnitude earthquake, killing roughly 30,000 people.
- December 30 – Publication (begun on January 14) of Franz Schubert's song cycle Winterreise is concluded posthumously.
- January 22 – Dora d'Istria, Romanian-Albanian writer (d. 1888)
- January 23 – Saigō Takamori, Japanese samurai (d. 1877)
- February 8 – Jules Verne, French science fiction author (d. 1905)
- March 13 – Sébastien Lespès, French admiral (d. 1897)
- March 17 – Patrick Cleburne, Irish soldier, Confederate general (d. 1864)
- March 18 – Randal Cremer, English politician, pacifist, recipient of the Nobel Peace Prize (d. 1908)
- March 20 – Henrik Ibsen, Norwegian playwright (d. 1906)
- March 24 – Horace Gray, Associate Justice of the Supreme Court of the United States (d. 1902)
- April 17 – Johanna Mestorf, German prehistoric archaeologist (d. 1909)
- April 20 – Josephine Butler, British social reformer (d. 1906)
- April 29 – Étienne Stéphane Tarnier, French obstetrician, inventor (d. 1897)
- May 8
- May 12 – Dante Gabriel Rossetti, English poet, painter (d. 1882)
- June 21 – Ferdinand André Fouqué, French geologist, petrologist (d. 1904)
- June 25 – Johannes Gijsbert Vogel, Dutch painter (d. 1915)
- July 9 – Luigi Oreglia di Santo Stefano, Italian Catholic churchman (d. 1913)
- July 23 – Jonathan Hutchinson, English physician (d. 1913)
- July 28 – Iosif Gurko, Russian field marshal (d. 1901)
- July 31 – Ignacio de Veintemilla, 11th President of Ecuador (d. 1908)
- August 6 – Andrew Taylor Still, American father of osteopathy (d. 1917)
- August 17 – Maria Deraismes, French feminist (d. 1894)
- August 28 – William A. Hammond, American military physician, neurologist and 11th Surgeon General of the United States Army (1862–1864) (d. 1900)
- September 8
- September 9 (O.S. August 28) – Leo Tolstoy, Russian writer (d. 1910)
- October 2 – Charles Floquet, Prime Minister of France (d. 1896)
- October 20 – Horatio Spafford, American author of the hymn It Is Well with My Soul (d. 1888)
- October 26 – William M. Robbins, U.S. Representative from North Carolina (d. 1905)
- October 31 – Joseph Swan, English physicist, chemist (d. 1914)
- November 17 – Milton Wright, American bishop of the United Brethren Church, father of aviation pioneers the Wright brothers (d. 1917)
- November 19 – Rani Lakshmibai, queen of the Maratha-ruled princely Indian state of Jhansi (d. 1858)
- November 26 – René Goblet, Prime Minister of France (d. 1905)
- December 8 – Clinton B. Fisk, American temperance movement leader (d. 1890)
- January 10 – François de Neufchâteau, French politician, intellectual (b. 1750)
- February 11 – DeWitt Clinton, 6th Governor of New York, United States Senator (b. 1769)
- March 12 – Jack Randall, early English boxing champion
- April 16 – Francisco Goya, Spanish painter (b. 1746)
- May 8 – Mauro Giuliani, Italian composer (b. 1781)
- May 16 – William Congreve, British rocket pioneer (b. 1772)
- May 28 – Daikokuya Kōdayū, Japanese castaway (b. 1751)
- June 1 – Lyncoya Jackson, second adopted son of American President Andrew Jackson (b. c. 1811)
- June 21 – Leandro Fernández de Moratín, Spanish dramatist, poet (b. 1760)
- July 9
- July 15 – Jean-Antoine Houdon, French sculptor (b. 1741)
- July 21 – Charles Manners-Sutton, Archbishop of Canterbury (b. 1755)
- August 23 – John Foster, 1st Baron Oriel, Irish politician (b. 1740)
- September 20 – George Bethune English, American explorer, writer (b. 1797)
- September 22 – Shaka, most influential leader of the Zulu Kingdom (b. 1787)
- September 25 – Charlotta Seuerling, Swedish musician (b. 1783)
- November 5 – Maria Feodorovna (Sophie Dorothea of Württemberg), Empress of Paul I of Russia (b. 1759)
- November 19 – Franz Schubert, Austrian composer (b. 1797)
- December 4 – Robert Jenkinson, 2nd Earl of Liverpool, Prime Minister of the United Kingdom (b. 1770)
- December 22
- ^ Portugal; or, Who is the lawful Successor to the Throne (London: John Richardson, 1828) p126
- ^ John Lynch, Simón Bolívar: A Life (Yale University Press, 2007) p233
- ^ British and Foreign State Papers.
- ^ John Clark Marshman, History of India from the Earliest Period to the Close of the East India Company's Government (William Blackwood and Sons, 1876) p357; reprinted by Cambridge University Press, 2010)
- ^ "Japan", in Encyclopedia of Hurricanes, Typhoons, and Cyclones, by David Longshore (Infobase Publishing, 2010) p272