This article is about the particular significance of the year 1833 to Wales and its people.
- 29 January - In the United Kingdom general election, Sir John Edwards, 1st Baronet, defeats Tory candidate Panton Corbett to win the enlarged constituency of Montgomery for the Liberals.
- 2 April - Launch of HMS Royal William at Pembroke Dock. This is the first ship to be built there with over 100 guns.
- 26 May - John Etherington Welch Rolls of The Hendre, Monmouth, marries Elizabeth Long, granddaughter of the 7th Earl of Northesk. They are the parents of John Rolls, 1st Baron Llangattock.
- Isaac Williams becomes Dean of Trinity College, Oxford.
- Lady Charlotte Bertie marries John Josiah Guest.
- Adrian Stephens invents the steam whistle as a safety device for use at Dowlais Ironworks; he fails to patent it.
- The community of Gomer, Ohio, is founded in the USA by Welsh settlers.
- Abbey Cwmhir Hall is constructed on the site of an earlier house.
Arts and literature
- 9 January - Sir Thomas Foley, admiral, 75
- 29 January - Thomas Evans, poet, 66
- 6 February - Robert Waithman, lord mayor of London, 69
- 26 February - Richard Jones, minister and writer, 61
- 4 May - William Morgan, scientist and actuary 82
- 16 August - John Edwards-Vaughan, politician, 61
- 1 October - Thomas Beynon, archdeacon of Cardigan and patron of the arts, 88