1851 in Wales

Incumbents

• Prince of Wales – Albert Edward
• Princess of Wales – vacant

  Events

• 24 September – Vale of Neath Railway opens from Neath to Aberdare.
• 27 August – William Bulkeley Hughes hosts a banquet at Bangor for Robert Stephenson.
• Richard Fothergill III is prosecuted for running a "truck shop" at Aberdare.
• David Davies marries Margaret Jones of Llanfair Caereinion.

  Arts and literature

New books

• John Blackwell – Ceinion Alun
• Richard Williams Morgan – A Tragedy of Powys Castle

  Music

• Thomas Jones – Gweddi Habacuc
• John Ambrose Lloyd – Teyrnasoedd y Ddaear
• John Owen
• *Deborah a Barac
• *Gweddi Habacuc

  Births

• 8 February – Sir Marteine Lloyd, 2nd Baronet
• 10 March – William Haggar, pioneer of the film industry
• 24 March – Robert Ambrose Jones
• 15 June – Ernest Howard Griffiths, physicist
• 8 July – Sir Arthur Evans, archaeologist
• 12 July – Elizabeth Phillips Hughes, promoter of women's education
• 27 December – Percy Gilchrist, industrialist

  Deaths

• 1 January – George Insole, English-born coal shipper, 60
• 6 April – William Morgan Kinsey, travel writer, 62?
• 8 April – John Parry, harpist and composer, 75
• 30 June
• *Thomas Phillips, founder of Llandovery College, 80
• *William Saunders, Welsh-language poet, 45
• 17 July – Aneurin Owen, historian, 58
• 13 August – Benjamin Gibson, classical scholar, younger brother of John Gibson, 40
• 22 November – Thomas Morgan, navy chaplain, 81