1812 in Wales

• Lord Lieutenant of Anglesey – Henry Paget, Earl of Uxbridge (until 13 March); Henry Paget, 1st Marquess of Anglesey (from 28 April){{cite book|author=Edward Breese|title=Kalendars of Gwynedd; or, Chronological lists of lords-lieutenant [&c.] ... for the counties of Anglesey, Caernarvon, and Merioneth|year=1873|page=24}}{{cite book | author=J.C. Sainty | author-link=John Sainty (civil servant) | title=List of Lieutenants of Counties of England and Wales 1660-1974 | publisher=Swift Printers (Sales) Ltd | location=London | year=1979}}{{cite book | last = Nicholas | first = Thomas | title = Annals and antiquities of the counties and county families of Wales | publisher = Genealogical Pub. Co | location = Baltimore | year = 1991 | isbn = 9780806313146 | page=695}}{{cite book|title=Cylchgrawn Hanes Cymru|publisher=University of Wales Press|year=1992|page=169}}
• Lord Lieutenant of Brecknockshire and Monmouthshire – Henry Somerset, 6th Duke of Beaufort{{cite book| author=Edwin Poole|title=The Illustrated History and Biography of Brecknockshire from the Earliest Times to the Present Day: Containing the General History, Antiquities, Sepulchral Monuments and Inscriptions|publisher=Edwin Poole|year=1886|page=378}}
• Lord Lieutenant of Caernarvonshire – Thomas Bulkeley, 7th Viscount Bulkeley{{cite book|author=Edward Breese|title=Kalendars of Gwynedd; or, Chronological lists of lords-lieutenant [&c.] ... for the counties of Anglesey, Caernarvon, and Merioneth|year=1873|page=26}}
• Lord Lieutenant of Cardiganshire – Thomas Johnes
• 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{{cite journal|journal=Old Wales: Monthly Magazine of Antiquities for Wales and the Borders|title=not known|author-link=William Retlaw Williams|publisher="Old Wales" Office|year=1907|volume=3|page=106}}
• Lord Lieutenant of Glamorgan – John Stuart, 1st Marquess of Bute{{cite book | last = Nicholas | first = Thomas | title = Annals and antiquities of the counties and county families of Wales | publisher = Genealogical Pub. Co | location = Baltimore | year = 1991 | isbn = 9780806313146 | page=612}}
• Lord Lieutenant of Merionethshire - Sir Watkin Williams-Wynn, 5th Baronet{{cite book|author=Edward Breese|title=Kalendars of Gwynedd; or, Chronological lists of lords-lieutenant [&c.] ... for the counties of Anglesey, Caernarvon, and Merioneth|year=1873|page=29}}
• Lord Lieutenant of Montgomeryshire – Edward Clive, 1st Earl of Powis{{cite web|author=R. G. Thorne|url=http://www.historyofparliamentonline.org/volume/1790-1820/member/clive-edward-1754-1839|title=Clive, Edward, 2nd Baron Clive (1754-1839), of Walcot, Salop|website=The History of Parliament: the House of Commons 1790-1820|date=1986|access-date=13 November 2021}}
• Lord Lieutenant of Pembrokeshire – Richard Philipps, 1st Baron Milford{{cite DWB|id=s-PHIL-PIC-1491|title=Philipps family, of Picton|author=Bertie George Charles|date=1959|access-date=19 October 2021}}
• Lord Lieutenant of Radnorshire – George Rodney, 3rd Baron Rodney{{cite book|author=Jonathan Williams|title=The History of Radnorshire|publisher=R. Mason|year=1859|page=115}}{{cite book|author=William Stockdale|title=Stockdale's Peerage of the United Kingdom|year=1833|page=86}}

• Bishop of Bangor – Henry Majendie{{cite book | last = Fryde | first = E. B. | title = Handbook of British chronology | publisher = New York Cambridge University Press | location = Cambridge England | year = 1996 | isbn = 9780521563505 | page=292}}{{cite book|author= Thomas Duffus Hardy|title=Fasti Ecclesiae Anglicanae: Or A Calendar of the Principal Ecclesiastical Dignitaries in England and Wales...|publisher= University Press|year=1854|page=305}}
• Bishop of Llandaff – Richard Watson{{cite book|author=John Henry James|title=A History and Survey of the Cathedral Church of SS. Peter, Paul, Dubritius, Teilo, and Oudoceus, Llandaff|publisher=Western Mail|year=1898|page=16}}
• Bishop of St Asaph – William Cleaver{{cite book|title=The Church of the people and free church penny magazine|year=1859|page=179}}{{cite book|title=The Apostolical Succession in the Church of England|publisher=James Parkes and Company|year=1866|page=15}}
• Bishop of St Davids – Thomas Burgess{{cite book|author= Thomas Duffus Hardy|title=Fasti Ecclesiae Anglicanae: Or A Calendar of the Principal Ecclesiastical Dignitaries in England and Wales...|publisher= University Press|year=1854|page=307}}{{cite book|title=The Monthly Review Or Literary Journal Enlarged|publisher=Porter|year=1780|page=95}}{{cite book|title=The Later Correspondence of George III, Volume 3|author=George III (King of Great Britain)|publisher=University Press|year=1967|page=434}}{{cite web |title=Records of Past Fellows: Burgess, Thomas |url=https://catalogues.royalsociety.org/CalmView/Record.aspx?src=CalmView.Persons&id=NA3174&pos=1 |website=The Royal Society |access-date=30 October 2020}}

• 20 June - Creation of The Kidwelly and Llanelli Canal and Tramroad Company.{{cite book | last = Wood | first = Andy | title = Abandoned & vanished canals of Ireland, Scotland and Wales | publisher = Amberley Publishing | location = Stroud England | year = 2015 | isbn = 9781445648699 }}
• Summer - Percy Bysshe Shelley stays at Nantgwyllt in the Elan Valley with his wife Harriet.
• September - Rioting occurs at Nefyn over enclosures.{{cite book|author=Caernarvonshire (Wales). County Record Office|title=Caernarvonshire records: the Caernarvonshire Record Office, twenty-one years 1947-1968: a catalogue of an exhibition held at Caernarvon, 19-26 October 1968|url=https://books.google.com/books?id=CFwKAQAAMAAJ|year=1968|publisher=County Record Office (County Archivist)|isbn=9780901337009 }}
• 17 September - The celebration of the completion of the embankment, later known as the 'Cob' in Porthmadog
• 30 December - A brig, the Fortune, is wrecked on The Smalls, Pembrokeshire, with the loss of 10 or 11 lives.{{Cite news |title=NAVAL INTELLIGENCE |newspaper=Liverpool Mercury etc |date=8 January 1813 |issue=80 }}
• 1 October - Balloonist James Sadler flies over the north Wales coastline in an unsuccessful attempt to cross the Irish Sea.Mark Davies: King of all balloons : the adventurous life of James Sadler, the first English aeronaut, Stroud, Gloucestershire : Amberley [2015], {{ISBN|978-1-4456-5308-2}}
• Opening of:
• Monmouthshire and Brecon Canal between Newport and Brecon.{{cite book|author=Charles Hadfield|title=Introducing Canals: A Guide to British Waterways Today|url=https://books.google.com/books?id=mf4JAAAAMAAJ|year=1955|publisher=Benn}}
• Aberdare branch of Glamorganshire Canal.

• Felicia Hemans - The Domestic Affections and Other Poems{{cite journal|author=Tricia Lootens|title=Hemans and Home: Victorianism, Feminine "Internal Enemies", and the Domestication of National Identity|journal=PMLA|volume = 109|publisher=Modern Language Association|issue=2|date=March 1994|pages=238–253|jstor = 463119|doi = 10.2307/463119}}
• Benjamin Millingchamp - A Sermon preached at St. Peter's Church, Carmarthen, on Thursday, July 4, 1811{{cite book|author=Benjamin Millingchamp|title=A Sermon Preached at St. Peter's Church, Carmarthen, on Thursday, July the 4th, 1811y|url=https://books.google.com/books?id=CSs4wQEACAAJ|year=1812|publisher=Printed and sold, by order of the Society for Promoting Christian Knowledge and Church Union in the Diocese of St. David's, by Jonathan Harris}}
• The New Flora Britannica (with illustrations by Sydenham Teak Edwards)

• Lewis Hopkin - Y Fêl Gafod
• Hugh Jones - Arwyrain Amaethyddiaeth

• Owen Dafydd - Ballad of the Brynmorgan Explosion

• 6 January - Catherine Glynne, future wife of William Ewart Gladstone (d. 1900){{cite book | last = Shkolnik | first = Esther | title = Leading ladies: a study of eight late Victorian and Edwardian political wives | publisher = Garland | location = New York | year = 1987 | isbn = 9780824078324 | page=69}}
• 3 February - Robert Elis (Cynddelw), poet and lexicographer (d. 1875)
• 3 April - Henry Richard, pacifist politician (d. 1888){{cite book|author=D. Ben Rees|title=Vehicles of Grace and Hope: Welsh Missionaries in India, 1800-1970|url=https://books.google.com/books?id=8rMKm-Ee1dYC&pg=PA185|year=2002|publisher=William Carey Library|isbn=978-0-87808-505-7|pages=185}}
• 19 May - Lady Charlotte Guest, translator and philanthropist (d. 1895){{Cite EB1911|wstitle=Schreiber, Lady Charlotte Elizabeth}}

• 15 January - Theophilus Jones, historian, 52{{Cite encyclopedia|first=Brynley F. |last=Roberts |authorlink=Brynley F. Roberts |title=Jones, Theophilus (1759–1812) |encyclopedia=Oxford Dictionary of National Biography |publisher=Oxford University Press |year=2004 |edition=online |doi=10.1093/ref:odnb/15085 }} {{subscription required}}
• 13 March - Henry Bayly Paget, 1st Earl of Uxbridge, Lord Lieutenant of Anglesey, 77{{cite book | last = Griffith | first = John | title = Pedigrees of Anglesey and Carnarvonshire families, with their collateral branches in Denbighshire, Merionethshire, and other parts | publisher = Bridge Books | location = Wrexham, Clwyd | year = 1985 | isbn = 9780950828558 | page=57}}
• May - Thomas Owen, clergyman and translator, 62
• 27 November (bur.) - Jane Cave, poet, c. 58

• 1812 in Ireland

{{reflist}}

Wales