1840s in Wales

This article is about the particular significance of the decade 1840–1849 to Wales and its people.

• 1840
• 1841
• 1842
• 1843
• 1844
• 1845
• 1846
• 1847
• 1848
• 1849

• Anne Beale — Traits and Stories of the Welsh Peasantry (1849)
• Robert Elis (Cynddelw) — Yr Adgyfodiad (1849)
• John Hughes — The Self-Searcher (1848)
• John Jenkins — National Education (1848)
• Samuel Lewis — Topographical Dictionary of Wales (1849)
• John Lloyd
  • Poems (1847)
  • The English Country Gentleman (1849)
• Richard Williams Morgan — Maynooth and St. Asaph (1848)
• Edward Parry — Railway Companion from Chester to Holyhead (1848)
• Thomas Stephens — The Literature of the Kymry (1849)
• Morris Williams (Nicander)
  • Y Flwyddyn Eglwysig (1843)
  • Llyfr yr Homiliau (1847)

• Rosser Beynon — Telyn Seion (1845)
• John Ambrose Lloyd — Y Ganaan Glyd (1845)
• Rowland Prichard — Cyfaill y Cantorion (The Singer's Friend) (1844)
• Robert Herbert Williams — Alawydd Trefriw (1848)

• 1840
  • September 16 — Alfred Thomas, 1st Baron Pontypridd (died 1927)
  • November 29 — Rhoda Broughton, novelist (died 1920)
  • December 3 — Francis Kilvert, diarist (died 1879)
  • December 5 — John E. Jones, governor of Nevada (died 1896)
  • December 17 — Matthew Vaughan-Davies, 1st Baron Ystwyth, politician (died 1935)
  • date unknown — John Rhŷs, educationist (died 1915)
• 1841
  • January 28 — Sir Henry Morton Stanley, explorer (died 1904)
  • May 21 — Joseph Parry, composer (died 1903)
  • November 9 — Edward Albert, Prince of Wales (later Edward VII; died 1910)
• 1842
  • June 14 — William Abraham (Mabon), politician (died 1922)
  • September 28 — William John Parry, quarrymen's leader (died 1927)
• 1843
  • May 12 — Thomas William Rhys Davids, founder of the Pali Text Society (died 1922)
  • December 20 — Frances Hoggan, first British woman to qualify as a doctor (died 1927)
• 1844
  • April 28 — Thomas Jones (Tudno), poet (died 1895)
  • July 28 — Gerard Manley Hopkins, Welsh-descended poet (died 1889)
  • December 1 — Alexandra of Denmark, Princess of Wales 1901–1910
• 1845
  • February 24 — Alfred Lewis Jones, shipping magnate (died 1909)
  • June 21 — Samuel Griffith, Premier of Queensland (died 1920)
  • October 10 — Timothy Richard, missionary
• 1847
  • date unknown
    • Daniel James, hymn-writer (died 1920)
    • Llewelyn Kenrick, footballer (died 1933)
• 1848
  • September 18 — Robert Harris, painter (died 1919)
  • December 30 — David Jenkins, composer (died 1915)
• 1849

• 1841
  • June 8 — John Elias, preacher (born 1774)
  • date unknown — John Blackwell (Alun), poet (born 1797)
• 1842
  • August 20 — Hussey Vivian, 1st Baron Vivian, relation of the Vivian family of Swansea (born 1775)
• 1843
  • March 26 — Robert Richford Roberts, Welsh-descended Methodist leader in the USA
  • March 27 — Henry Nevill, 2nd Earl of Abergavenny (born 1755)
• 1845
  • January 1 — Sir William Nott, military leader (born 1782)
• 1848
  • March 18 — John Crichton-Stuart, 2nd Marquess of Bute, creator of modern Cardiff (born 1793)
  • date unknown — Thomas Price (Carnhuanawc), poet and historian (born 1787)
• 1849
  • March 21 — William Sherley Williams, Welsh-descended pioneer
  • September 16 — Thomas Jones, missionary