1831 in Wales

Centuries:	17th; 18th; 19th; 20th; 21st;
Decades:	1810s; 1820s; 1830s; 1840s; 1850s;
See also:	List of years in Wales; Timeline of Welsh history 1831 in The United Kingdom Scotland Elsewhere

This article is about the particular significance of the year 1831 to Wales and its people.

Incumbents

28 April–1 June – In the UK general election:
- Robert Fulke Greville is defeated in Pembrokeshire by Sir John Owen of Orielton.^[1]
- Edward Lloyd-Mostyn, 2nd Baron Mostyn becomes MP for Flintshire.
- John Jones of Ystrad is injured in rioting during the election at Carmarthen, causing polling there to be postponed.^[2]
3 June – The Merthyr Rising reaches its climax.^[3]
5 August – Charles Darwin travels from Shrewsbury to Llangollen with his tutor, Rev Adam Sedgwick, to carry out geological studies. They remain in Wales for more than two weeks.^[4]
17 August – The paddle steamer Rothsay Castle is wrecked at the eastern end of the Menai Strait with the loss of 93 lives.^[5]
August – John Jones of Ystrad holds the constituency of Carmarthen.
22 October – John Jones of Ystrad and Robert Fulke Greville fight a duel at Tafarnspite.
Repeal of the slate tax.
Port Talbot ironworks opens.
William Rees (Gwilym Hiraethog) becomes a minister.

Y Drysorfa a Calvinistic Methodist publication, restarts under the editorship of John Parry

13 January – William Hugh Evans, minister and author (d. 1909)
May – Dewi Havhesp, poet (d. 1884)
3 May – Sir Walter Vaughan Morgan, Lord Mayor of London (d. 1916)
16 May – David E. Hughes, musician and professor of music (d. 1900)
21 July – Edward Lewis, Welsh-born New Zealand clergyman (d. 1913)
16 October – John Jones (Eos Bradwen), composer (d. 1899)
8 December
- William Dykins, poet (d. 1872)
- Edward Payson Evans, historian and linguist (d. 1917)
14 December – Griffith John, missionary (d. 1912)
20 December – William T. Davies, Governor of Pennsylvania (d. 1912)
date unknown – William Davies (Gwilym Teilo), writer (d. 1892)

7 January – Edward "Celtic" Davies, author, 74
17 April – Sir Thomas Mostyn, 6th Baronet, politician, 54
8 June – Sarah Siddons, actress, 75
11 August – Cradock Glascott, Evangelical clergyman and associate of the Wesley brothers, 88
13 August – Dic Penderyn, labourer, 23 (executed)

^ "OWEN, Sir John, 1st bt. (1776-1861), of Orielton, Pemb". History of Parliament Online. Retrieved 11 February 2019.
^ David Williams. "JONES, JOHN (1777-1842), 'of Ystrad', politician". Dictionary of Welsh Biography. National Library of Wales. Retrieved 11 February 2019.
^ David Egan (1 January 1987). People, Protest, and Politics: Case Studies in Nineteenth Century Wales. Gomer Press. ISBN 978-0-86383-350-2.
^ Lucas, Peter (1 January 2010). "The recovery of time past: Darwin at Barmouth on the eve of the Beagle". Darwin Online. Retrieved 21 January 2010.
^ Joseph Adshead (1834). A Circumstantial Narrative of the Wreck of the Rothsay Castle Steampacket: On Her Passage from Liverpool to Beaumaris, August 17, 1831 ... Hamilton, Adams, and Company. p. 169.