1829 in the United Kingdom
- 8 January – hanging of body-selling murderer William Burke in Edinburgh. His associate William Hare, who has testified against him, is released.
- 26 January – first performance of Douglas Jerrold's comic nautical melodrama Black-Eyed Susan; or, All in the Downs at the Surrey Theatre in Lambeth; it will run for a new record of well over 150 performances.
- 1–2 February – York Minster is extensively damaged in a fire started by Jonathan Martin (who is subsequently acquitted of arson on the grounds of insanity).
- 21 March – a duel is fought between the Prime Minister (the Duke of Wellington) and George Finch-Hatton, 10th Earl of Winchilsea, in Battersea Fields, provoked by the Duke's support for Catholic emancipation and foundation of the secular King's College London. Deliberately off-target shots are fired by both and honour is satisfied without injury.
- 27 March – Zoological Society of London receives its royal charter.
- April–September – the composer Felix Mendelssohn pays his first visit to Britain. This includes the first London performance of his concert overture to A Midsummer Night's Dream and his trip to Fingal's Cave.
- 13 April – passage of the Roman Catholic Relief Act by Parliament of the United Kingdom granting Catholic Emancipation.
- 5 June – slave trade: HMS Pickle captures the armed slave ship Voladora off the coast of Cuba.
- 10 June – the Oxford University Boat Club wins the first inter-university Boat Race, rowed at Henley-on-Thames.
- 19 June – Robert Peel's Metropolitan Police Act establishes the Metropolitan Police Service.
- 30 June – Henry Robinson Palmer files a patent application for corrugated iron for use in buildings.
- 4 July – George Shillibeer begins operating the first bus service in London.
- 2–3 August – the "Muckle Spate", a great flood of the River Findhorn which devastates much of Strathspey, Scotland, washing away many bridges.
- 14 August – King's College London founded by Royal Charter
- 29 September – the first police officers of the Metropolitan Police Service, known by the nicknames "bobbies" or "peelers", go on patrol in London.
- 8 October – George Stephenson's steam locomotive, The Rocket, defeats John Ericsson's Novelty and thus wins The Rainhill Trials held near Liverpool.
- 4 December – in the face of fierce opposition, British Lord William Bentinck carries a regulation declaring that all who abet suttee in India are guilty of culpable homicide.
- 13 December – last British hanging for forgery – Thomas Maynard.
- Undated – last of the Bounty mutineers dies at Pitcairn Island.
- Anglo-Ashanti war (1823–1831)
- Thomas Carlyle's essay Signs of the Times.
- Thomas Love Peacock's novel The Misfortunes of Elphin (anonymous).
- Walter Scott's novel Anne of Geierstein (anonymous).
- 17 January – Catherine Booth, the Mother of The Salvation Army (died 1890)
- 10 April – William Booth, the founder of The Salvation Army (died 1912)
- 8 June – John Everett Millais, painter (died 1896)
- 14 July – Edward White Benson, Archbishop of Canterbury (died 1896)
- John Lowther du Plat Taylor, founder of the Army Post Office Corps (died 1904)
- 25 January – William Shield, composer, violinist and violist (born 1748)
- 28 January – William Burke, murderer and grave robber, executed (born 1792, Ireland)
- 8 May – Charles Abbot, 1st Baron Colchester, barrister, statesman, Speaker of the House of Commons (born 1759)
- 10 May – Thomas Young, physician and linguist (born 1773)
- 29 May – Sir Humphry Davy, chemist (born 1778)
- 27 June – James Smithson, mineralogist, chemist and sponsor of the Smithsonian Institution (born 1765)
- Gillan, Don (2007). "Longest Running Plays in London and New York". Retrieved 2011-02-15.
- Balston, Thomas (1945). The Life of Jonathan Martin.
- Grove, George (1 October 1904). "Mendelssohn's Scotch Symphony". The Musical Times. 45 (740): 644. JSTOR 904111.
- Penguin Pocket On This Day. Penguin Reference Library. 2006. ISBN 0-14-102715-0.
- "Foundations of The Boat Race". The Xchanging Boat Race. Theboatrace.org. Retrieved 2012-03-29.
- Thomson, Nick (2011). Corrugated Iron Buildings. Oxford: Shire Publications. pp. 7–8. ISBN 978-0-7478-0783-4.
- "Icons, a portrait of England 1820–1840". Archived from the original on 22 September 2007. Retrieved 2007-09-12.
- Mcewen, Lindsey J.; Werritty, Alan (2007). "The Muckle Spate of 1829: the physical and societal impact of a catastrophic flood on the River Findhorn, Scottish Highlands". Transactions of the Institute of British Geographers. 32: 66–89. doi:10.1111/j.1475-5661.2007.00232.x.