|Covid-19|Monarch - George III
Prime Minister - Frederick North, Lord North, (Tory)
16 January - American Revolutionary War: British naval victory at the Battle of Cape St. Vincent over a Spanish squadron.
8 March - American Revolutionary War: The League of Armed Neutrality is formed by Russia to try to prevent the Royal Navy from searching neutral vessels for contraband.
26 March - The British Gazette and Sunday Monitor, the first Sunday newspaper in Britain, begins publication.
4 May - The first Epsom Derby horse race is run on Epsom Downs, Surrey. The victor is Diomed.
12 May - American Revolutionary War: Charleston, South Carolina is taken by British forces.
2 June - An Anti-Catholic mob led by Lord George Gordon marches on Parliament leading to the outbreak of the Gordon Riots in London.
7 June - The Gordon Riots are ended by the intervention of troops. About 285 people are shot dead, with another 200 wounded and around 450 arrested.
July - Robert Raikes initiates a Sunday school movement, in Gloucester.
10 July - American Revolutionary War: 6,000 French troops led by Jean-Baptiste Donatien de Vimeur, comte de Rochambeau land in Newport, Rhode Island but are pinned down by the British.
September - Outbreak of the Second Anglo-Mysore War in India.
9 August - American Revolutionary War: Spanish admiral Luis de Córdova y Córdova captures a British convoy totalling 55 vessels amongst Indiamen, frigates and other cargo ships off Cape St. Vincent.
16 August - American Revolutionary War: Battle of Camden - The British defeat the Americans near Camden, South Carolina.
2 October - American Revolutionary War: British spy John André is hanged by American forces.
7 October - American Revolutionary War: Patriot militia defeat the Loyalist militia at the Battle of Kings Mountain.
20 November - American Revolutionary War: Britain declares war on the Dutch Republic to stop it from joining the League of Armed Neutrality.
20 December - Outbreak of the Fourth Anglo-Dutch War.
The Duke of Richmond calls, in the House of Lords, for manhood suffrage and annual parliaments, which are rejected.
William Cavendish, 5th Duke of Devonshire, begins development of Buxton Crescent and the Devonshire Royal Hospital to promote Buxton in the Derbyshire Peak District as a spa resort.
The market town of Middleton, Dorset, is demolished by order of the landowner, Joseph Damer, Lord Milton, and the population moved to a new model village, Milton Abbas.
The original Craven Cottage is built by William Craven, 6th Baron Craven, in London.
25 February - John Sumner, Archbishop of Canterbury (died 1862)
21 May - Elizabeth Fry, humanitarian (died 1845)
26 December - Mary Fairfax Somerville, mathematician (died 1872)
14 February - William Blackstone, jurist (born 1723)
12 May - Herod, racehorse (born 1758)
18 May - Charles Hardy, governor of Newfoundland (born c. 1714)
3 June – Thomas Hutchinson, American-born last governor of Massachusetts Bay Colony (born 1711)
4 September - John Fielding, magistrate and social reformer (born 1721)
2 October - John André, British Army officer of the American Revolutionary War (executed) (born 1750)
17 October - William Cookworthy, chemist (born 1705)
26 November - Sir James Denham Steuart, 4th Baronet, economist (born 1712)
26 December - John Fothergill, physician (born 1712)
date unknown - Thomas Dilworth, cleric and writer (year of birth unknown)
1780 in Great Britain Wikipedia
Events from the year 1780 in Great Britain.