:1803 in Wales

• Lord Lieutenant of Anglesey – Henry Paget{{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, 5th Duke of Beaufort (until 11 October); Henry Somerset, 6th Duke of Beaufort (from 4 November){{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 – John Vaughan
• 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 – vacant until 1804
• 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 – Thomas Harley{{cite book|author=Jonathan Williams|title=The History of Radnorshire|publisher=R. Mason|year=1859|page=115}}

• Bishop of Bangor – William Cleaver{{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}}{{cite book|title=The Monthly Review Or Literary Journal Enlarged|publisher=Porter|year=1780|page=95}}{{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}}
• 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 – Lewis Bagot (until 4 June); Samuel Horsley{{cite book|title=The Apostolical Succession in the Church of England|publisher=James Parkes and Company|year=1866|page=15}}
• Bishop of St Davids – Lord George Murray (until 3 June); Thomas Burgess (from 24 July){{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}}

• 26 June - First public assembly of the South Wales Unitarian Association.
• Robert Saunderson of Liverpool settles at Bala and becomes official printer to the Calvinistic Methodist Society, working for Thomas Charles.
• 17 July - Thomas Burgess is consecrated Bishop of St David's.{{cite book|title=The Imperial Magazine, Or, Compendium of Religious, Moral, & Philosophical Knowledge|url=https://books.google.com/books?id=mYAAAAAAYAAJ&pg=PA689|year=1825|pages=689}}
• September - A new company, the Union Iron World Company, is formed to run Rhymney ironworks, after Benjamin Hall takes it over.{{cite book|author=Arthur Clark|title=The Story of Monmouthshire|url=https://books.google.com/books?id=Tx1UAAAAYAAJ|year=1962|publisher=C. Davies|isbn=978-0-9506618-0-3|page=80}}
• date unknown
• Rhys Davies (Y Glun Bren) preaches from the mounting-block in front of the Black Lion Inn at Talybont in Cardiganshire, beginning Independent Methodist activity there.
• Pascoe Grenfell contracts to trade in copper in the Swansea area.{{cite book | last = Todd | first = A. C. | title = The industrial archaeology of Cornwall | publisher = David and Charles | location = Newton Abbot | year = 1972 | isbn = 9780715355909 | page=22}}
• Thomas Johnes sets up a private printing press to publish translations of French medieval chronicles.
• Dunraven Castle is built, near Southerndown.
• Benjamin Heath Malkin begins his travels in South Wales.
• Paeonia mascula is discovered growing on the island of Steep Holm - the only species of peony native to the British Isles.{{Cite web |url=http://www.thepeonysociety.org/Steep_Holm.html |title=The Peony Society - Steep Holm |access-date=2011-01-12 |archive-url=https://web.archive.org/web/20110728100222/http://www.thepeonysociety.org/Steep_Holm.html |archive-date=2011-07-28 |url-status=dead }}

• J. T. Barber - A Tour Throughout South Wales and Monmouthshire
• Robert Davies (Bardd Nantglyn) - Barddoniaeth
• William Owen Pughe - Geiriadur Cymraeg-Saesneg

• 10 May - Christopher Rice Mansel Talbot, landowner, industrialist and politician, owner of Margam Castle (died 1890){{cite book|author1=John Hodgson|author2=John Hodgson-Hinde|title=A History of Northumberland: The topography and local antiquities, arranged in parishes. 3 v|url=https://books.google.com/books?id=k55nAAAAMAAJ&pg=PA212|year=1827|publisher=E. Walker|pages=212}}
• 29 June - Peter Maurice, priest and writer (died 1878)
• 15 September - Charles Octavius Swinnerton Morgan, politician, historian and antiquary (died 1888)[https://www.britishmuseum.org/the_museum/departments/prehistory_and_europe/history_of_the_collection.aspx History of the collection], British Museum, accessed July 2010
• 17 October - Samuel Holland, industrialist (died 1892)
• 18 October - Sir Richard Green-Price, 1st baronet, Liberal politician (died 1887)
• 23 November - Edward Edwards, zoologist (died 1879)
• 25 December - Sir Hugh Owen Owen, 2nd Baronet (died 1891).{{cite web|last1=Escott|first1=Margaret|title=Owen, Hugh Owen (1803–1891), of Williamston and Llanstinan, Pemb.|url=http://www.historyofparliamentonline.org/volume/1820-1832/member/owen-hugh-1803-1891|website=The History of Parliament|access-date=14 March 2018}}
• date unknown
• Dafydd Jones (Dewi Dywyll), balladeer (died 1868)
• Owain Meirion, balladeer (died 1868)

• 2 January - Sir Richard Perryn, judge, 79{{cite DNB|wstitle=Perryn, Richard}}
• 29 April - Thomas Jones, landscape painter, 60{{cite book|author=Honourable Society of Cymmrodorion (London, England)|title=The Transactions of the Honourable Society of Cymmrodorion|url=https://books.google.com/books?id=QY9nAAAAMAAJ|year=1984|publisher=The Society.}}
• 3 June - Lord George Murray, Bishop of St David's and developer of the UK's first optical telegraph, 42{{cite book|author1=John Hodgson|author2=John Hodgson-Hinde|title=A History of Northumberland: The topography and local antiquities, arranged in parishes. 3 v|url=https://books.google.com/books?id=k55nAAAAMAAJ&pg=PA212|year=1827|publisher=E. Walker|pages=212}}
• 28 September - Ralph Griffiths, editor and publisher, 83?{{cite book|author=James King|title=Faking|url=https://books.google.com/books?id=pzu73hVFhT8C&pg=PA28|date=1 April 1999|publisher=Dundurn|isbn=978-1-55488-529-9|pages=28}}
• 11 October - Henry Somerset, 5th Duke of Beaufort, Lord Lieutenant of Brecknockshire and Monmouthshire, 58{{cite book|author=William Arthur Shaw|title=The Knights of England: A Complete Record from the Earliest Time to the Present Day...|publisher=Genealogical Publishing Company|year=1970|page=48}}
• date unknown - Thomas Evans, London bookseller, 64{{cite DWB|id=s1-EVAN-THO-1739|title=Evans, Thomas (1739-1803), and Evans, Thomas (1742-1784), two London booksellers|author=Robert Thomas Jenkins|access-date=6 February 2020}}

• 1803 in Ireland

{{reflist}}

{{Year in Europe|1803}}

Wales

Category:1803 in Europe

Category:1800s in Wales