Editing 1820 (section)

=== January–June ===
[[File:Allan Ramsay - King George III in coronation robes - Google Art Project.jpg|110px|thumb|King [[George III of the United Kingdom|George III]]]]
*[[January 17]] – [[Daniel Albert Wyttenbach]], Swiss-born academic (b. 1746)
*[[January 23]] – [[Prince Edward, Duke of Kent and Strathearn]], member of British Royal Family and father of [[Queen Victoria]]  (b. 1767)
*[[January 29]] – King [[George III of the United Kingdom]] (b. 1738)
*[[February 5]] – [[William Drennan]], Irish physician, poet and radical politician (b. 1754)
*[[February 11]] – [[Karl von Fischer]], German architect (b. 1782)
*[[February 14]] – [[Charles Ferdinand, Duke of Berry]], French noble (stabbed) (b. 1778)<ref name="Ewald1868"/>
*[[March 11]] – [[Benjamin West]], Anglo-American painter of historical scenes (b. 1738)<ref>{{cite book|author=Charles Edwards Lester|title=The Democratic Age: Statesmanship, Science, Art, Literature, and Progress|url=https://books.google.com/books?id=gXsAAAAAYAAJ&pg=PA204|year=1858|publisher=Hale, Valentine & Company|pages=204}}</ref>
*[[March 22]] – [[Stephen Decatur]], American sailor (b. 1779)<ref>{{cite book|author=United States. Congress|title=Congressional Record: Proceedings and Debates of the ... Congress|url=https://books.google.com/books?id=7zs4AQAAMAAJ&pg=PA3133|year=1939|publisher=U.S. Government Printing Office|pages=3133}}</ref>
*[[April 8]] – [[Thomas Douglas, 5th Earl of Selkirk]], Scottish-born philanthropist (b. 1771)
*[[April 20]] – [[James Morris III]], Continental Army officer from Connecticut (b. 1752)
*[[May 30]] – [[William Bradley (giant)|William Bradley]], Britain's tallest ever man (b. 1787)
*[[June 6]] – [[Henry Grattan]], Irish politician (b. 1746)
*[[June 9]] – [[Wilhelmina of Prussia, Princess of Orange]] (b. 1751)
*[[June 19]] – Sir [[Joseph Banks]], English naturalist and botanist (b. 1743)<ref>{{cite book|author=Edward Edwards|title=Lives of the Founders of the British Museum (etc.) 1570-1870|url=https://books.google.com/books?id=GWloAAAAcAAJ&pg=PA28|year=1870|publisher=Trübner|pages=28}}</ref>
*[[June 20]] – [[Manuel Belgrano]], Argentine politician, general in the Independence War (b. 1770)<ref>{{cite book|author=United States. Office of Inter-American Affairs|title=Air-Mail Feature and Radio Service|url=https://books.google.com/books?id=trJOmjWmVaYC|year=1945|page=2}}</ref>