1780 in Wales

Centuries:	16th; 17th; 18th; 19th; 20th;
Decades:	1760s; 1770s; 1780s; 1790s; 1800s;
See also:	List of years in Wales; 1780 in Great Britain Ireland Scotland

This article is about the particular significance of the year 1780 to Wales and its people.

Incumbent[]

January - Admiral Sir Thomas Foley plays an important role in the relief of Gibraltar.
1 July - Anthony Bacon acquires the lease of the Hirwaun ironworks.
26 August - succeeds to the Rûg estate.^[1]
29 September - Sir Watkin Lewes is elected Lord Mayor of London.
marries his cousin Margaret and acquires the Madryn estate.^[2]
The Ladies of Llangollen settle at Plas Newydd.
Richard Price devises the "Northampton Tables" for calculating actuarial valuation for assurance and pensions.
The development of Ebbw Vale Steelworks begins.

Henry Mills of Llanidloes impresses Thomas Charles so much with his singing that he is appointed to supervise the improvement of congregational singing in the district.^[3]

10 February - James Henry Cotton, Dean of Bangor (died 1862)
15 April - Angharad Llwyd, antiquary (died 1866)
14 May - Sir Thomas Frankland Lewis, politician (died 1855)
7 October - Wyndham Lewis, MP (died 1838)
date unknown
- Dic Aberdaron (Richard Robert Jones), traveller and linguist (died 1843)^[4]
- Thomas Prothero, lawyer and businessman (died 1853)^[5]

^ Welsh Biography Online. Accessed 31 March 2016
^ Thomas Richards. "PARRY (and JONES-PARRY) family, Madryn, Llŷn". Welsh Biography Online. National Library of Wales. Retrieved 27 May 2018.
^ Owain Edwards; Trevor Herbert. "Mills family". Grove Music Online. Retrieved 27 May 2018.
^ Humphreys, H. The Celebrated Cambrian Linguist, or the History of Dick Aberdaron (Carnarvon: H. Humphreys, 1866).
^ Welsh Biography Online, Prothero, Thomas.
^ Robert Thomas Jenkins. "MEREDITH , Sir JOHN (1714-1780), lawyer, of Brecon". Welsh Biography Online. National Library of Wales. Retrieved 27 May 2018.
^ David Jenkins. "GLYNNE family, of Hawarden, Flints". Welsh Biography Online. National Library of Wales. Retrieved 27 May 2018.
^ Davies, Sir William Llewelyn (2007). "Thomas, Richard (1753–1780), cleric, transcriber and collector of manuscripts, and genealogist". Welsh Biography Online. National Library of Wales. Retrieved 31 March 2009.