Editing 1823 (section)

=== January–June ===
[[File:Edward Jenner. Oil painting. Wellcome V0023503.jpg|thumb|right|110px|[[Edward Jenner]]]]
[[File:Louis-Nicolas Davout (1770-1823), duc d'Auerstaedt, prince d'Eckmül, maréchal de France - Pierre Gautherot.jpg|thumb|right|110px|[[Louis-Nicolas Davout]]]]
* [[January 21]]
** [[Gideon Olin]], American politician (b. 1743)
** [[Cayetano José Rodríguez]], Argentine representative to the Congress of Tucumán
* [[January 22]] – [[John Julius Angerstein]], Russian-born English merchant, insurer and art collector (b. 1735)
* [[January 26]] – [[Edward Jenner]], English physician, medical researcher (b. 1749)
* [[January 27]] – [[Charles Hutton]], English mathematician (b. 1737)
* [[January 28]] – [[Return J. Meigs Sr.]], American colonel (b. 1740)
* [[February 9]] – [[Agnes Ibbetson]], English plant physiologist (b. 1757)
* [[February 7]] – [[Ann Radcliffe]], English writer (b. 1764)
* [[February 21]] – [[Charles Wolfe]], Irish poet (b. 1791)
* [[March 1]] – [[Pierre-Jean Garat]], French Basque opera singer (b. 1764)
* [[March 5]] – [[Magdalena Rudenschöld]], Swedish conspirator (b. 1766)
* [[March 14]]
** [[Charles François Dumouriez]], French general (b. 1739)
** [[John Jervis, 1st Earl of St Vincent]], British Royal Navy admiral (b. 1735)
* [[March 18]]
** [[Jean-Baptiste Bréval]], French cellist (b. 1753)
** [[Henry Brockholst Livingston]], [[Associate Justice of the Supreme Court of the United States]] (b. 1757)
* [[March 19]] – [[Adam Kazimierz Czartoryski]], Polish aristocrat and patron of the arts (b. 1734)
* [[April 18]] – [[George Cabot (senator)|George Cabot]], American politician (b. 1752)
* [[June 1]] – [[Louis-Nicolas Davout]], French marshal (b. 1770)
* [[June 19]] – [[William Combe]], English writer, poet and adventurer (b. 1742)