1914 in Wales
- Prince of Wales - Edward
- Princess of Wales - vacant
- Archdruid of the National Eisteddfod of Wales - Dyfed
- 14 January - The first trolleybuses in Wales come into operation, in Aberdare.
- 23 February - Light cruiser HMS Cordelia is launched at Pembroke Dock.
- 2 May - South Wales Transport begins operating motorbuses in the Swansea area.
- 4 August - World War I: Declaration of war by the United Kingdom on the German Empire.
- 6 August - Pembroke Dock-built HMS Amphion (1911) becomes the first British naval casualty of the war when she strikes mines off the east coast.
- 18 September - Welsh Church Act, disestablishing the Church in Wales, receives Royal Assent, but simultaneously with the Suspensory Act which delays its coming into effect.
- 21 September - William Charles Fuller wins the Victoria Cross for carrying a wounded officer to safety under fire.
- 14 November - Light cruiser HMS Carysfort is launched at Pembroke Dock.
- A Welsh Home Rule Bill, introduced by Edward T. John, MP for East Denbighshire, fails.
- A women's teacher training college opens at Barry; a men's equivalent opens at Caerleon.
- The hundredth intermediate school in Wales is established under the Welsh Intermediate and Technical Education Act 1889.
- William James Thomas, industrialist and philanthropist, is knighted.
Arts and literature
- National Eisteddfod of Wales - not held
- Rhoda Broughton - Concerning a Vow
- Moelwyn - Caniadau Moelwyn, vol. 4
- Bertrand Russell - Our Knowledge of the External World as a Field for Scientific Method in Philosophy
- T. E. Ellis - Pont Orewyn
- T. Gwynn Jones - Caradog yn Rhufain
- David John de Lloyd - Gwlad fy Nhadau (cantata)
- Rugby union
- 28 January - Trefor Morgan, financier (d. 1970)
- 11 February - Mervyn Levy, art critic (d. 1996)
- 12 March - Tommy Farr, boxer (d. 1986)
- 12 March - Cliff Jones, Wales international rugby captain (d. 1990)
- 21 March - Sir Goronwy Daniel, academic and civil servant (d. 2003)
- 23 April - Glyn Daniel, archaeologist and television presenter (d. 1986)
- 18 May - Louis Ford, footballer
- 24 May
- 9 September - Alexander Cordell, novelist (d. 1997)
- 12 September - Desmond Llewelyn, actor (d. 1999)
- 22 October - David Tecwyn Lloyd, author (d. 1992)
- 27 October - Dylan Thomas, poet (d. 1953)
- 21 November - Charles Fisher, poet (d. 2006)
- 2 December - Russell Taylor, Wales international rugby player
- 7 December - Bryan Hopkin, economist (d. 2009)
- 22 February - Ivor Bertie Guest, 1st Baron Wimborne, 78
- 4 May - Rowland Griffiths, rugby player, 28 (typhoid)
- 18 June - Abel Davies, rugby union player, 53?
- 21 June - Morgan Bransby Williams, engineer
- 23 July - Harry Evans, conductor and composer, 41
- 8 August - Sir Edward Anwyl, academic, 48
- 22 August (in Swanley) - James Dickson Innes, artist, 27 (tuberculosis)
- 27 August - William Lewis, 1st Baron Merthyr, 77
- 17 September - Shadrach Pryce, clergyman and educationalist, 81?
- 2 October - Jack Hughes, footballer, 59
- 27 October - Sir T. Marchant Williams, lawyer and author