1820 in Wales

This article is about the particular significance of the year 1820 to Wales and its people.

Incumbents

 * Lord Lieutenant of Anglesey – Henry Paget, 1st Marquess of Anglesey
 * Lord Lieutenant of Brecknockshire and Monmouthshire – Henry Somerset, 6th Duke of Beaufort
 * Lord Lieutenant of Caernarvonshire – Thomas Bulkeley, 7th Viscount Bulkeley
 * Lord Lieutenant of Cardiganshire – William Edward Powell
 * Lord Lieutenant of Carmarthenshire – George Rice, 3rd Baron Dynevor
 * Lord Lieutenant of Denbighshire – Sir Watkin Williams-Wynn, 5th Baronet
 * Lord Lieutenant of Flintshire – Robert Grosvenor, 1st Marquess of Westminster
 * Lord Lieutenant of Glamorgan – John Crichton-Stuart, 2nd Marquess of Bute
 * Lord Lieutenant of Merionethshire – Sir Watkin Williams-Wynn, 5th Baronet
 * Lord Lieutenant of Montgomeryshire – Edward Clive, 1st Earl of Powis
 * Lord Lieutenant of Pembrokeshire – Richard Philipps, 1st Baron Milford
 * Lord Lieutenant of Radnorshire – George Rodney, 3rd Baron Rodney


 * Bishop of Bangor – Henry Majendie
 * Bishop of Llandaff – Herbert Marsh (until 28 April); William Van Mildert (from 31 May)
 * Bishop of St Asaph – John Luxmoore
 * Bishop of St Davids – Thomas Burgess

Events

 * 29 January – The Prince of Wales becomes King George IV of the United Kingdom upon the death of his father, King George III.
 * 14 April – At the completion of the United Kingdom general election:
 * Henry Paget, later Marquess of Anglesey, is elected as member for Anglesey.
 * Wyndham Lewis is elected for Cardiff.
 * Christopher Cole is re-elected for Glamorganshire.
 * 24 June – The Honourable Society of Cymmrodorion is revived, having been in abeyance since 1787.
 * date unknown
 * The first "colliery school" in the South Wales coalfield is established at Hirwaun.
 * Thomas Price (Carnhuanawc) founds a Welsh school at Gelli Felen.
 * Crawshay Bailey becomes a partner at Nant-y-glo ironworks with his brother, Joseph Bailey.
 * Tondu Ironworks is built by Sir Robert Price.
 * John Scandrett Harford meets Bishop Thomas Burgess and offers to donate the site of Lampeter Castle for the construction of St David's College.

New books

 * Felicia Hemans – The Sceptic
 * John Jones (Tegid) – Traethawd ar Gadwedigaeth yr Iaith Gymraeg
 * Robert Jones – Drych yr Amseroedd
 * William Probert - Y Gododdin (first English translation)

Music

 * Edward Jones – Hen Ganiadau Cymru

Births

 * 13 May – Robert Owen, theologian (d. 1902)
 * 21 May – Sir Thomas Lloyd, 1st Baronet, politician and landowner (d. 1877)
 * 22 May – Sir Watkin Williams-Wynn, 6th Baronet, politician (d. 1885)
 * 20 June – Thomas Essile Davies (Dewi Wyn o Essyllt), poet (d. 1891)
 * 5 September – Evan Jones (Ieuan Gwynedd), minister and journalist (d. 1852)

Deaths

 * 20 January – Eliezer Williams, clergyman and genealogist, 75
 * 29 January – King George III of the United Kingdom, Prince of Wales 1751–1760, 81
 * 6 May – Wilmot Vaughan, 2nd Earl of Lisburne, landowner, 64
 * 16 June – Thomas Jones of Denbigh, Methodist preacher and writer, 64
 * 27 June – William Lort Mansel, bishop and academic, 67
 * 23 August – Edward Randles, harpist, 57
 * 28 August – Henry Mills, musician, 63