January–June
- January 23 – William Pitt the Younger, Prime Minister of the United Kingdom (b. 1759)
- February 2 – Rétif de la Bretonne, French writer (b. 1734)
- February 16 – Franz von Weyrother, Austrian general (b. 1755)
- February 19 – Elizabeth Carter, English writer (b. 1717)
- February 20 – Lachlan McIntosh, Scottish-born American military and political leader (b. 1725)
- March 23 – George Pinto English composer (b. 1785)
- March 30 – Georgiana Cavendish, Duchess of Devonshire (b. 1757)
- April 9 – William V of Orange (b. 1748)
- April 22 – Pierre-Charles Villeneuve, French admiral (stabbed) (b. 1763)
- May 24 – John Campbell, 5th Duke of Argyll, British field marshal (b. 1723)
- June 23 – Mathurin Jacques Brisson, French naturalist (b. 1723)