1799 in Great Britain

• Monarch – George III
• Prime Minister – William Pitt the Younger (Tory){{cite web |title=History of William Pitt 'The Younger' - GOV.UK |url=https://www.gov.uk/government/history/past-prime-ministers/william-pitt |website=www.gov.uk |access-date=1 July 2023 |language=en}}
• Foreign Secretary – Lord Grenville

• 9 January – Prime Minister William Pitt the Younger introduces an income tax of two shillings to the pound{{cite book|title=Penguin Pocket On This Day|publisher=Penguin Reference Library|isbn=0-14-102715-0|year=2006}} to raise funds for Great Britain's war effort in the French Revolutionary Wars.
• 20 March–21 May – British troops lend aid to the Ottoman defenders against the French Siege of Acre.{{cite book|last=Williams|first=Hywel|title=Cassell's Chronology of World History|publisher=Weidenfeld & Nicolson|location=London|year=2005|isbn=0-304-35730-8|page=[https://archive.org/details/cassellschronolo0000will/page/348 348]|url=https://archive.org/details/cassellschronolo0000will/page/348}}
• 4 May – Battle of Seringapatam: British forces defeat the Sultan of Mysore; his kingdom is divided between the Honourable East India Company and Hyderabad.{{cite book|last=Palmer|first=Alan|last2=Palmer|first2=Veronica|year=1992|title=The Chronology of British History|publisher=Century Ltd|location=London|pages=237–238|isbn=0-7126-5616-2}}
• 1 July – Britain allies with Russia, Austria, Portugal, Naples, and the Ottoman Empire against France.
• 12 July – Parliament passes:
• The Combination Act to outlaw trade unions.{{cite web|url=https://www.bbc.co.uk/history/british/launch_tl_british.shtml|title=BBC History British History Timeline|accessdate=2007-09-04|archiveurl= https://web.archive.org/web/20070909012414/http://www.bbc.co.uk/history/british/launch_tl_british.shtml|archivedate=2007-09-09}}
• Unlawful Societies Act to outlaw clandestine radical societies and require a printer's imprint on all published material.{{cite web|title=Unlawful Societies Act 1799|work=vlexJustis|url=https://vlex.co.uk/vid/unlawful-societies-act-1799-808113257|accessdate=2023-03-15}}
• 15–19 August – A combined French and Spanish fleet stands off the south west coast of England.Lloyd's List.
• 27 August – Anglo-Russian invasion of Holland: Britain and Russia send an expedition to the Batavian Republic.
• 30 August – Anglo-Russian invasion of Holland: Vlieter Incident – A squadron of the Batavian Republic's navy, commanded by Rear-Admiral Samuel Story, surrenders to the British Royal Navy under Sir Ralph Abercromby and Admiral Sir Charles Mitchell near Wieringen without joining action.
• 6 October – Anglo-Russian invasion of Holland: Battle of Castricum – Franco-Dutch forces defeat the Russo-British expedition force.
• 9 October – Sinking of {{HMS|Lutine|1779}}, a famous treasure wreck, in the West Frisian Islands.
• 16 October – Action of 16 October 1799: A Spanish treasure convoy worth more than £600,000 is captured by the Royal Navy off Vigo.
• 18 October – Anglo-Russian invasion of Holland: Capitulation of Anglo-Russian expedition forces in North Holland.
• 23 October – The River Severn ferry at The Tuckies, Jackfield, Shropshire capsizes and 28 workers from Coalport China Works are drowned.{{cite book|first=Neil|last=Clarke|title=Crossing the River: Fords and Ferries on the Shropshire Severn|location=Derby|publisher=Railway and Canal Historical Society|year=2015|isbn=978-0-901461-62-9|pages=43–44}}
• 5 November – HMS Sceptre is wrecked in a storm in Table Bay, South Africa, with the loss of 349 and 41 survivors.{{cite book|title=The United Service Magazine|chapter=The Autobiography of Sir John Barrow|url=https://archive.org/details/bub_gb_C6sktnjjNBIC|pages=[https://archive.org/details/bub_gb_C6sktnjjNBIC/page/n187 337]|year=1847|accessdate=2008-11-04|publisher=H. Colburn}}
• The Religious Tract Society is established as an evangelical publisher in Paternoster Row, London; as The Lutterworth Press the imprint continues into the 21st century.

• Anglo-Spanish War, 1796–1808
• French Revolutionary Wars, War of the Second Coalition

• January – James Meadows Rendel, civil engineer (died 1856)
• 12 January – Priscilla Susan Bury, botanist (died 1872)
• 8 February – John Lindley, botanist (died 1865)
• 16 March – Anna Atkins, botanist and photographer (died 1871){{cite book|first=Catharine M. C.|last=Haines|title=International Women in Science: A Biographical Dictionary to 1950|location=Santa Barbara|publisher=ABC-CLIO|year=2001|isbn=978-1-57607-090-1|page=10}}
• 29 March – Edward Smith-Stanley, 14th Earl of Derby, Prime Minister (died 1869)
• 17 April – Eliza Acton, cookery writer (died 1859)
• 13 May – Catherine Gore, author (died 1861)
• 21 May – Mary Anning, paleontologist (died 1847)
• 23 May – Thomas Hood, poet (died 1845)
• 18 June – William Lassell, astronomer (died 1880)
• 25 June – David Douglas, Scottish botanist (died 1834 in Hawaii)
• 8 September – James Bowman Lindsay, Scottish inventor (died 1862)
• 21 December – Ignatius Spencer, priest (died 1864)
• James Townsend Saward, barrister and forger (date of death unknown)
• Approximate date – William Simson, Scottish-born painter (died 1847)

• 26 January – Gabriel Christie, Scottish-born general and settler in Montreal (born 1722)
• 26 May – James Burnett, Lord Monboddo, Scottish judge and comparative linguist (born 1714)
• 14 June – Sir Patrick Warrender, Scottish soldier and politician (born 1731){{cite web | url = http://www.historyofparliamentonline.org/volume/1754-1790/member/warrender-patrick-1731-99 | title = WARRENDER, Patrick (1731-99), of Lochend, Haddington.|publisher= History of Parliament Online |accessdate =20 March 2018}}
• 4 August – John Bacon, sculptor (born 1740)
• 5 August – Richard Howe, 1st Earl Howe, admiral (born 1726)
• 25 August – John Arnold, watchmaker (born 1736)
• 3 September – William Thomas, academic and Chancellor of Llandaff Cathedral (born 1726){{cite DWB|id=s-THOM-WIL-1734|title=Thomas, William (1734-1799), cleric and antiquary|author=Hywel David Emanuel|publisher=National Library of Wales|access-date=26 November 2020}}
• 6 October – William Withering, physician (born 1741)
• 4 November – Josiah Tucker, economist (born 1713){{cite book|author=Ruth Savage|title=Philosophy and Religion in Enlightenment Britain: New Case Studies|url=https://books.google.com/books?id=8zTVtbQQuKsC&pg=PA240|date=26 April 2012|publisher=OUP Oxford|isbn=978-0-19-922704-4|page=240}}

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Category:1799 by country

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Category:1790s in Great Britain