This article is about the particular significance of the year 1907 to Wales and its people.

• Archdruid of the National Eisteddfod of Wales – Dyfed^[1]

• Lord Lieutenant of Anglesey – Sir Richard Henry Williams-Bulkeley, 12th Baronet
• Lord Lieutenant of Brecknockshire – Joseph Bailey, 2nd Baron Glanusk^[2]
• Lord Lieutenant of Caernarvonshire – John Ernest Greaves^[3]
• Lord Lieutenant of Cardiganshire – Herbert Davies-Evans^[4]
• Lord Lieutenant of Carmarthenshire – Sir James Williams-Drummond, 4th Baronet^[5]
• Lord Lieutenant of Denbighshire – William Cornwallis-West^[6]
• Lord Lieutenant of Flintshire – Hugh Robert Hughes^[7]
• Lord Lieutenant of Glamorgan – Robert Windsor-Clive, 1st Earl of Plymouth
• Lord Lieutenant of Merionethshire – W. R. M. Wynne^[8]
• Lord Lieutenant of Monmouthshire – Godfrey Morgan, 1st Viscount Tredegar^[9]
• Lord Lieutenant of Montgomeryshire – Sir Herbert Williams-Wynn, 7th Baronet
• Lord Lieutenant of Pembrokeshire – Frederick Campbell, 3rd Earl Cawdor^[10]
• Lord Lieutenant of Radnorshire – Powlett Milbank^[11]

• Bishop of Bangor – Watkin Williams^[12]
• Bishop of Llandaff – Joshua Pritchard Hughes^[13]
• Bishop of St Asaph – A. G. Edwards (later Archbishop of Wales)^[14]
• Bishop of St Davids – John Owen^[15]

• 3 January – Formal opening of the residence at St Deiniol's Library.^[16]
• 17 February – The cargo ship SS Orianda sinks off Barry after colliding with the SS Heliopolis, with the loss of 14 crew.^[17]
• 5 March – Six miners are killed in a shaft accident at Windsor Colliery, Abertridwr.
• 19 March – The National Library of Wales (Aberystwyth) and National Museum of Wales (Cardiff) receive their charters.
• 11 May – Swansea Corporation's newly constructed Cray Reservoir is filled with water for the first time.
• 11 July – Edward VII visits Bangor to lay the foundation stone of the new University College of North Wales buildings. Principal Henry Reichel is knighted.^[18]
• 13 July – Opening of the Queen Alexandra Dock in Cardiff, attended by the King and Queen.
• 25 July – Francis Edwards, MP for Radnorshire, is created a baronet.
• 1 November – First performance of John Hughes' hymn tune "Cwm Rhondda" in its final version, at Capel Rhondda Welsh Baptist Chapel, Hopkinstown, Pontypridd with the composer at the (new) organ.^[19]
• 10 November – Five miners are killed in an accident at Seven Sisters Colliery.
• 14 December – Seven miners are killed in an accident at Dinas Main Colliery, Gilfach Goch.^[20]
• December – Edgeworth David joins Ernest Shackleton’s Nimrod Expedition to the South Pole.
• date unknown
  • Owen Morgan Edwards becomes Chief Inspector of Schools for Wales.
  • The Board of Education establishes a special Welsh department.
  • C. H. Watkins designs and builds the first aircraft in Wales at Cardiff, and names it Robin Goch.
  • Opening of Dolgarrog hydroelectric power station.
  • Oakdale Colliery is sunk in the Sirhowy Valley.^[21]
  • The silver and lead mine at Llywernog reopens in order to prospect for zinc.

• St David's Hotel, a hotel for golfers located at Harlech, in Gwynedd, is designed to plans by the Glasgow School architect George Henry Walton for a syndicate of entrepreneurs of which he was a member.^[23] (The proposals were subsequently revised in 1908, and the hotel was built in 1910.^[23] The hotel closed in 2008,^[24] and planning permission for demolition was approved in 2009).

• Bowls – The Welsh Open Bowls Championship is launched.
• Boxing
  • 1 June – Jim Driscoll wins the British featherweight title.
  • 8 August – Joe White wins the British welterweight title (disputed).
• Rugby league
  • Ebbw Vale RLFC and Merthyr Tydfil RLFC are formed, the first Welsh rugby league teams.
• Rugby union
  • Wales finish second in the 1907 Home Nations Championship
  • 1 January – Cardiff beat the touring South Africa national team, 17 - 0.

• 3 January – Ray Milland, actor (died 1986)^[25]
• 10 January – Nicholas Evans, artist (died 2004)^[26]
• 11 January – Reg Thomas, athlete (died 1946)
• 4 March – Emlyn John, footballer (died 1962)
• 6 April – Jacques Vaillant de Guélis, Special Operations Executive agent (died 1945)^[27]
• 30 April – Harry Bowcott, international rugby player and president of the Welsh Rugby Union (died 2004)^[28]
• 7 May – Trevil Morgan, cricketer (died 1976)^[29]
• 24 May – Gwyn Jones, writer (died 1999)^[30]
• June – David Llewellyn, trade unionist (died after 1956)
• 8 June – Trevor Thomas, art historian and author (died 1993)^[31]
• 10 June – Ernie Curtis, footballer (died 1992)
• 19 June – Rodney David, cricketer (died 1969)
• 2 July – Dick Duckfield, cricketer (died 1959)^[32]
• 12 August – Rhys Lloyd, Baron Lloyd of Kilgerran, politician (died 1991)^[33]
• 25 August – Albert Fear, Wales international rugby player (died 2000)^[34]
• 25 September – Raymond Glendenning, radio sports commentator (died 1974)^[35]
• 30 September – Arthur Probert, politician (died 1975)^[36]
• 27 November – Glyn Prosser, Wales international rugby player (died 1972)
• 9 December – T. J. Morgan, academic (died 1986)^[37]
• 10 December – Harry Payne, Wales international rugby player (died 2000)
• 19 December – William Glynne-Jones, novelist and children's writer (died 1977)^[38]
• 21 December – Will Roberts, painter (died 2000)^[39]
• 22 December – Harold Jones, rugby player (died 1955)
• 23 December – Fred Warren, international footballer (died 1986)
• 26 December – Guy Morgan, rugby player and cricketer (died 1973)

• 7 January – David Rowlands (Dewi Môn), minister, academic and writer, 70^[40]
• 13 January – Frances Elizabeth Wynne, artist, 71^[41]
• 10 March – George Douglas-Pennant, 2nd Baron Penrhyn, industrialist and politician, 70^[42]
• 24 March – John Pugh, minister (Forward Movement)
• 2 June – Rose Mary Crawshay, philanthropist, 79^[43]
• 5 July – John Romilly Allen, archaeologist, 60^[44]
• 14 August – David Treharne Evans, Lord Mayor of London
• October – Hugh Davies (Pencerdd Maelor), composer
• 27 September – Alfred Davies, businessman and politician, 58^[45]
• 29 October – Megan Watts Hughes, singer, 65^[46]
• 11 November – Ralph Sweet-Escott, English-born Wales rugby international and Glamorgan cricketer, 38
• 12 November – Sir Lewis Morris, Anglo-Welsh poet, 74^[47]
• 27 November – Cyril Flower, 1st Baron Battersea, politician, 64^[48]
• 30 November – John Price, footballer, 52/3

• 1907 in Ireland