Events from the year1806 in theUnited Kingdom.

• Monarch –George III
• Prime Minister –William Pitt the Younger (Tory) (until 23 January);William Grenville, 1st Baron Grenville (Coalition) (starting 11 February)
• Foreign Secretary –Henry Phipps, 1st Earl of Mulgrave (until 7 February)Charles James Fox (from 7 February)Charles Grey, Viscount Howick (from 24 September)
• Secretary of War –Lord Castlereagh (until 5 February)William Windham (from 5 February)

• 5 January – The body ofHoratio Nelson, 1st Viscount Nelson, lies in state in the Painted Hall ofGreenwich Hospital, London.
• 8 January –Battle of Blaauwberg: British infantry force troops of theBatavian Republic in theDutch Cape Colony to withdraw.
• 9 January
  • The Dutch commandant ofCape Town surrenders to British forces. On 10 January, formal capitulation is signed under theTreaty Tree in Papendorp (modern-dayWoodstock).
  • Lord Nelson is given astate funeral and interment atSt Paul's Cathedral in London, attended bythe Prince of Wales.^[1]
• 18 January – TheDutch Cape Colony capitulates to British forces, the origin of its status as acolony within theBritish Empire.
• 23 January –William Pitt the Younger dies aged 46 at Bowling Green House onPutney Heath of a gastrointestinal tract complaint and is succeeded as wartimePrime Minister by his cousinLord Grenville.
• 6 February –Battle of San Domingo: The BritishRoyal Navy gains a victory over the French offSanto Domingo.
• 11 February –Ministry of All the Talents formed by Grenville.
• 20 March – Construction begins ofDartmoor Prison, to houseprisoners of war.^[2]
• 8 April – Proceedings for theimpeachment ofHenry Dundas, 1st Viscount Melville (on the initiative ofSamuel Whitbread) for themisappropriation of public money at theAdmiralty begin; he will beacquitted in the lastimpeachment trial ever held in theHouse of Lords.
• 16 May – TheOrder in Council of 16 May 1806 declares all ports fromBrest (France) to theElbe to be under a state ofblockade by the Royal Navy.^[3]
• 4 July –Invasion of Naples (War of the Third Coalition):Battle of Maida inCalabria – British forces defeat the French.
• 7 July – Start of the firstGentlemen v Players cricket match (discontinued in 1963).^[4][5]
• 10 July –Vellore Mutiny, the first instance of a mutiny by theIndiansepoys against theBritish East India Company.
• 23 July –British invasions of the River Plate: A British expeditionary force of 1,700 men lands on the left bank of theRío de la Plata and invadesBuenos Aires.
• 18 August – Englishseal hunterAbraham Bristow discovers theAuckland Islands.^[6][7]
• 7 October –Carbon paper patented byRalph Wedgwood.^[2]
• 20 October –HMS Athenienne (1800) is wrecked in theStrait of Sicily with the loss of 347 of the 488 onboard.
• 29 October to 17 December – aGeneral election seesGrenville continue as Prime Minister.
• 21 November –Napoleon'sBerlin Decree initiates theContinental System, blocking the import of British manufactured goods to the rest of Europe.^[8]

• Supposedly secret 'Delicate Investigation' by senior statesmen into the life of Caroline of Brunswick, the Prince of Wales's estranged wife, finds "no foundation" for allegations against her morals.^[9]
• Annual British iron production reaches 260,000 tons.

• Anglo-Spanish War, 1796–1808
• Napoleonic Wars, 1803–1815

• A New System of Domestic Cookery, 1st edition, "by A Lady" (Maria Eliza Rundell) published in London byJohn Murray.
• Rhymes for the Nursery by sistersJane andAnn Taylor published in London, including Jane's "The Star" ("Twinkle, Twinkle, Little Star").^[10][11][12]

• 1 February –Jane Williams (Ysgafell), writer (died 1885)
• 6 March –Elizabeth Barrett Browning, poet (died 1861)
• 9 April –Isambard Kingdom Brunel, engineer (died 1859)
• 21 April –George Cornewall Lewis, statesman (died 1863)
• 4 May –William Fothergill Cooke, inventor (died 1879)
• 20 May –John Stuart Mill, philosopher (died 1873)
• 27 June –Augustus De Morgan, mathematician, logician (died 1871)
• 10 November –Alexander Milne, admiral (died 1896)
• 11 December
  • William Prowting Roberts, Chartist lawyer (died 1871)
  • Alfred Swaine Taylor, toxicologist, "father of British forensic medicine" (died 1880)

• c. January?? –Mungo Park, Scottish explorer (born 1771)
• 23 January –William Pitt the Younger,Prime Minister (born 1759)^[13]
• 19 February –Elizabeth Carter, writer (born 1717)
• 20 February –Lachlan McIntosh, Scottish-born American military and political leader (born 1725)
• 17 March –David Dale, Scottish philanthropist (born 1739)
• 23 March –George Pinto, composer (born 1785)
• 24 May –John Campbell, 5th Duke of Argyll, Scottish field marshal (born 1723)
• 10 July –George Stubbs, painter (born 1724)
• 13 September –Charles James Fox, statesman (born 1749)
• 22 October –Thomas Sheraton, furniture designer (born 1751)
• 23 November –Roger Newdigate, politician (born 1719)
• 29 December –Charles Lennox, 3rd Duke of Richmond, politician (born 1735)

• 1806 in the United Kingdom
• Years of the 19th century in the United Kingdom
• 1806 by country
• 1806 in Europe
• 1800s in the United Kingdom

• Articles with short description
• Short description is different from Wikidata
• Use dmy dates from October 2020