1831 in Wales

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

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

Incumbent[]

28 April–1 June – In the UK general election:
- Robert Fulke Greville is defeated in Pembrokeshire by .^[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

13 January – , 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 – (Eos Bradwen), composer (d. 1899)
8 December
- , 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 – , writer (d. 1892)

^ "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.