Year 1805 (MDCCCV) was a common year starting on Tuesday (link will display the full calendar) of the Gregorian calendar (or a common year starting on Sunday of the 12-day slower Julian calendar).
Events of 1805
January–March
April – July
October–December
Undated
Ongoing events
Births
January–June
July–December
- July 29 – Alexis de Tocqueville, French historian (d. 1859)
- August 4 – William Rowan Hamilton, Irish mathematician (d. 1865)
- August 29 – Frederick Maurice, English theologian (d. 1872)
- November 14 – Fanny Mendelssohn, German composer and pianist (d. 1847)
- November 28 – John Lloyd Stephens, American traveler, diplomat and Mayanist archaeologist (d. 1852)
- December 22 – John Obadiah Westwood, British entomologist (d. 1893)
- December 23 – Joseph Smith, Jr., American prophet, founder of The Church of Jesus Christ of Latter-day Saints (Mormonism) (d. 1844)
Deaths
January–June
- January 9 – Noble Wimberly Jones, American Continental Congressman (b. 1723)
- January 18 – John Moore, Archbishop of Canterbury (b. 1730)
- January 23 – Claude Chappe, French telecommunication pioneer (b. 1763)
- February 25 – Thomas Pownall, British colonial statesman (b. 1722)
- March 4 – Jean-Baptiste Greuze, French painter (b. 1725)
- May 7 – William Petty, 2nd Earl of Shelburne, Prime Minister of the United Kingdom (b. 1737)
- May 9 – Friedrich Schiller, German playwright (b. 1759)
- May 25 – William Paley, English philosopher (b. 1743)
- May 28 – Luigi Boccherini, Italian composer (b. 1743)
- June 19 – Louis-Jean-François Lagrenée, French painter (b. 1724)
July–December
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