1780 in Wales

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

Incumbents

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 - Edward Williames Salusbury Vaughan succeeds to the Rûg estate.
29 September - Sir Watkin Lewes is elected Lord Mayor of London.
unknown dates
*Thomas Parry Jones-Parry marries his cousin Margaret and acquires the Madryn estate.
*The Ladies of Llangollen settle at Plas Newydd.
*St David's Club established in Aberystwyth, the oldest gentlemen's club in Wales.
*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.