1748 in Wales

Incumbents

• Lord Lieutenant of North Wales – George Cholmondeley, 3rd Earl of Cholmondeley
• Lord Lieutenant of Glamorgan – Charles Powlett, 3rd Duke of Bolton
• Lord Lieutenant of Brecknockshire and Lord Lieutenant of Monmouthshire – Thomas Morgan
• Lord Lieutenant of Cardiganshire – Wilmot Vaughan, 3rd Viscount Lisburne
• Lord Lieutenant of Carmarthenshire – vacant until 1755
• Lord Lieutenant of Denbighshire – Sir Robert Salusbury Cotton, 3rd Baronet ; Richard Myddelton
• Lord Lieutenant of Pembrokeshire – Sir Arthur Owen, 3rd Baronet
• Lord Lieutenant of Radnorshire – William Perry
• Bishop of Bangor – Zachary Pearce
• Bishop of Llandaff – John Gilbert
• Bishop of St Asaph – Samuel Lisle Robert Hay Drummond
• Bishop of St Davids – The Hon. Richard Trevor

Events

• 8 March - With the death of the childless William Herbert, 3rd Marquess of Powis, the title becomes extinct. Henry Arthur Herbert subsequently becomes 1st Earl of Powis.
• Richard Wilson paints the two eldest sons of Frederick, Prince of Wales.
• Joseph Harris becomes Assay-Master at the Royal Mint.
• A major eisteddfod is held at Selattyn.
• William Williams Pantycelyn marries Mary Francis of Llansawel.
• The Salusbury family leave Lleweni Hall.

Arts and literature

New books

• Lewis Morris - ''Plans of Harbours, Bays, and Roads in St. George's and the Bristol Channels''

Births

• 1 September - Thomas Johnes, landowner

Deaths

• 8 March - William Herbert, 3rd Marquess of Powis, 50
• 27 August - Sir Robert Salusbury Cotton, 3rd Baronet, 53
• December - John Harris, Sr., Welsh-descended American trader, 75