1899 in Wales
- Prince of Wales — Albert Edward
- Princess of Wales — Alexandra
- Archdruid of the National Eisteddfod of Wales — Hwfa Môn
- 20 March — W. H. Davies, "tramp-poet", loses his foot trying to jump a freight train at Renfrew, Ontario.
- 29 March — A French barque, Le Marechal Lannes, is wrecked off Grassholm, with the loss of its crew of 25.
- April — The Duke and Duchess of York visit Gwydir Castle.
- 23 May — William Goscombe John's statue of "The Little Girl" at Llansannan is unveiled by Mrs Herbert Roberts.
- 20 July — A rabid dog attacks a group of children in Pontarddulais. In August, eight of them are sent to the Pasteur Institute in Paris to be inoculated.
- date unknown
- Businessman Arthur Keen buys the Dowlais Iron Company from Ivor Bertie Guest, 1st Baron Wimborne.
- The Rhymney Railway opens Caerphilly railway works.
- The George Hotel, Chepstow, is rebuilt.
- Explorer Henry Morton Stanley is knighted.
- In the United States, J. Vyrnwy Morgan, pastor of the First Baptist Church at Omaha, Nebraska, relocates to Denver, Colorado, for the sake of his wife's health. (She dies on New Year's Day 1900.)
Arts and literature
- Chair — withheld
- Crown — Richard Roberts
- Rhoda Broughton — Foes in Law
- John Owen Jones (Ap Ffarmwr) — Cofiant Gladstone
- Allen Raine — By Berwyn Banks
- 11 March — The Gramophone Company makes the first recording in the Welsh language, including Madge Breese singing Hen wlad fy nhadau.
- Yachting — The River Towy Yacht Club is founded.
- 18 February — Mervyn Johns, actor (died 1992)
- 8 March — Eric Linklater, writer (died 1974)
- 14 April — Arthur Owens, intelligence agent (died 1957)
- 28 April — Len Davies, footballer (died 1945)
- 17 May — H. H. Price, philosopher (died 1984)
- 18 May — David James Jones (Gwenallt), poet (died 1968)
- 16 June — Jack Gore, Wales international rugby player (died 1971)
- 16 July — Ernie Finch, Wales international rugby player (died 1983)
- 12 December — Charlie Jones, footballer (died 1966)
- 20 December — Martyn Lloyd-Jones, preacher (died 1981)
- 2 March — John Owen Jones (Ap Ffarmwr), journalist, 38
- 22 March — Tom Morgan Wales international rugby player, 32
- 5 April — T. E. Ellis, politician, 40
- 4 August — Daniel Lewis Lloyd, bishop and academic, 55
- 28 August — Owen Glynne Jones, mountaineer, 31
- 18 November — Henry Hicks, geologist, 62
- 23 November — Dai St. John, heavyweight boxer, 28
- 13 October — Charles Ashton, literary historian, 51 (suicide)
- Moult, Thomas (1934). W. H. Davies. London: Thornton Butterworth.
- Wrexham Advertiser, 27 May 1899.
- "Timeline History of Caerphilly". Welcome to Caerphilly. Retrieved 2013-11-22.
- Clash, Hilary (1988). The History of the George Inn, Chepstow. pp. 4–12. Retrieved 2013-07-20.
- Millward, Edward (1961). "John Vyrnwy Morgan". National Library of Wales Journal. 12.
- "Charles Ashton Letters and Newspaper Cuttings". Archives Wales. Retrieved 2013-11-17.