Editing 1821 (section)

== Deaths ==

=== January–June ===
[[File:Jacques-Louis David - The Emperor Napoleon in His Study at the Tuileries - Google Art Project.jpg|thumb|right|110px|[[Napoleon Bonaparte]]]]
* [[January 4]] – [[Elizabeth Ann Seton]], American saint (b. 1774)
* [[January 5]] – [[Carlo Porta]], Milanese poet (b. 1775)
* [[January 19]] – [[Alexandru Suţu]], prince of Moldavia (b. 1758)
* [[February 23]] – [[John Keats]], British poet (b. 1795)<ref>{{Cite web|title=BBC – History – Historic Figures: John Keats (1795–1821)|url=https://www.bbc.co.uk/history/historic_figures/keats_john.shtml|website=bbc.co.uk|access-date=January 3, 2017}}</ref>
* [[February 26]] – [[Joseph de Maistre]], French-Savoyard philosopher (b. 1753)
* [[March 4]] – [[Princess Elizabeth of Clarence]], daughter of [[William IV of the United Kingdom|William, Duke of Clarence (later King William IV)]] (b. 1820)
* [[March 13]] – [[John Hunter (Royal Navy officer)|John Hunter]], second Governor of New South Wales (b. 1737)
* [[April 10]] – [[Patriarch Gregory V of Constantinople]] (b. 1746)
* [[April 20]] – [[Franz Karl Achard]], German chemist, physicist and biologist (b. 1753)
* [[April 23]] – [[Pierre de Ruel, marquis de Beurnonville]], French general (b. 1752)
* [[May 2]] – [[Hester Thrale]], Welsh diarist and friend of Dr Johnson (b. 1741)<ref>{{cite book|author1=Marilyn Bailey Ogilvie|author2=Joy Dorothy Harvey|author-link=Marilyn Bailey Ogilvie|author2-link=Joy Harvey|title=The Biographical Dictionary of Women in Science: L-Z|url=https://books.google.com/books?id=LTSYePZvSXYC&pg=PA1026|year=2000|publisher=Taylor & Francis|isbn=978-0-415-92040-7|pages=1026}}</ref>
* [[May 5]] – [[Napoleon Bonaparte]], French Emperor and general (b. 1769)<ref>{{Cite web |title=Napoleon I {{!}} Biography, Achievements, & Facts |url=https://www.britannica.com/biography/Napoleon-I |website=Encyclopedia Britannica |access-date=11 July 2021 |language=en}}</ref>
* [[May 19]] –  [[Camille Jordan (politician)|Camille Jordan]], French politician (b. 1771)
* [[June 7]] – [[Tudor Vladimirescu]], Wallachian rebel leader (b. c. 1780)
* [[June 17]] – [[Martín Miguel de Güemes]], Argentine military leader (b. 1785)
* [[June 19]] – [[Peter Ochs]], Swiss politician (b. 1752)
* [[June 23]] – [[Louise Marie Adélaïde de Bourbon-Penthièvre, Duchess of Orléans]], heiress, wife of [[Philippe Égalité]] (b. 1753)
* [[June 30]] – [[José Fernando de Abascal y Sousa]], viceroy of Peru (b. 1743)

=== July–December ===
[[File:John William Polidori by F.G. Gainsford.jpg|thumb|right|110px|[[John William Polidori]]]]
* [[July 4]] – [[Richard Cosway]], English artist (b. 1742)
* [[July 14]] – [[Pedro Juan Caballero (politician)|Pedro Juan Caballero]], Paraguayan captain (b. 1786) (suicide)
* [[July 17]] – [[Fulgencio Yegros]], Paraguayan general and politician (b. 1780)
* [[August 7]] – [[Caroline of Brunswick]], Queen of the United Kingdom (b. 1768)
* [[August 20]] – [[Dorothea von Medem]], Latvian diploma, duchess of Courland (b. 1761)
* [[August 24]] – [[John William Polidori]], English physician, writer (b. 1795) (suicide)<ref>{{Cite journal|last=Viets|first=Henry R.|date=1961|title="By The Visitation Of God": The Death Of John William Polidori, M.D., In 1821|journal=The British Medical Journal|volume=2|issue=5269|pages=1773–1775|doi=10.1136/bmj.2.5269.1773|jstor=20356143|pmid=14037964|pmc=1970869|issn=0007-1447}}</ref>
* [[September 4]] – [[José Miguel Carrera]], Chilean general, founding father (b. 1785)
* [[September 10]] – [[Johann Dominicus Fiorillo]], German painter, art historian (b. 1748)
* [[September 14]] – [[Heinrich Kuhl]], German naturalist, zoologist (b. 1797)
* [[October 4]] – [[Marie-Louise Lachapelle]], French [[obstetrician]] (b. 1769)
* [[October 6]] – [[Anders Jahan Retzius]], Swedish chemist, botanist (b. 1742)
* [[October 8]] – [[Juan O'Donojú]], viceroy of New Spain (b. 1762)
* [[October 11]] – [[John Ross Key]], American judge, lawyer, father of songwriter [[Francis Scott Key]] (b. 1754)
* [[October 21]] – [[Dorothea Ackermann]], German actress (b. 1752)
* [[November 8]] – [[Jean Rapp]], French general (b. 1771)
* [[December 4]] – [[John Henniker-Major, 2nd Baron Henniker]], British politician (b. 1752)
* [[December 7]] – King [[Pōmare II]] of Tahiti (b. 1782)
* [[December 12]] – [[Phoebe Hessel]], British female soldier (b. 1713)