1755 in Wales

Incumbents

• Lord Lieutenant of North Wales – George Cholmondeley, 3rd Earl of Cholmondeley
• Lord Lieutenant of Glamorgan – Other Windsor, 4th Earl of Plymouth
• Lord Lieutenant of Brecknockshire and Lord Lieutenant of Monmouthshire – Thomas Morgan
• Lord Lieutenant of Cardiganshire – Wilmot Vaughan, 3rd Viscount Lisburne
• Lord Lieutenant of Carmarthenshire – George Rice
• Lord Lieutenant of Denbighshire – Richard Myddelton
• Lord Lieutenant of Pembrokeshire – Sir William Owen, 4th Baronet
• Lord Lieutenant of Radnorshire – William Perry
• Bishop of Bangor – Zachary Pearce
• Bishop of Llandaff – Edward Cresset ; Richard Newcome
• Bishop of St Asaph – Robert Hay Drummond
• Bishop of St Davids – Anthony Ellys

Events

• Following the death of his wife in this year, Griffith Jones (Llanddowror) goes to live at the home of Madam Bridget Bevan.
• The Brecknockshire Agricultural Society is formed.

Arts and literature

New books

• Rules of the Honourable Society of Cymmrodorion are published.

Music

• Morgan Rhys – ''Golwg o Ben Nebo, ar Wlad yr Addewid''

Births

• 22 February – Henry Nevill, 2nd Earl of Abergavenny
• 9 May – Wilmot Vaughan, 2nd Earl of Lisburne, owner of the Trawsgoed estate
• 5 July – Sarah Siddons, actress
• 14 October – Thomas Charles of Bala, clergyman
• 21 October – Caleb Hillier Parry, Welsh-descended physician
• 18 November – Rev. William Jones

Deaths

• 13 February – Edward Cresset, Bishop of Llandaff, 57
• 30 June – Edward Wynne, lawyer and landowner
• 12 July – Zachariah Williams, inventor, 81
• date unknown – John Owen, chancellor of Bangor