1770 in Wales

Incumbents

• Lord Lieutenant of Anglesey - Sir Nicholas Bayly, 2nd Baronet
• Lord Lieutenant of Brecknockshire and Monmouthshire – Thomas Morgan of Rhiwpera
• Lord Lieutenant of Caernarvonshire - Thomas Wynn
• Lord Lieutenant of Cardiganshire – Wilmot Vaughan, 1st Earl of Lisburne
• Lord Lieutenant of Carmarthenshire – George Rice
• Lord Lieutenant of Denbighshire - Richard Myddelton
• Lord Lieutenant of Flintshire - Sir Roger Mostyn, 5th Baronet
• Lord Lieutenant of Glamorgan – Other Windsor, 4th Earl of Plymouth
• Lord Lieutenant of Merionethshire - William Vaughan
• Lord Lieutenant of Montgomeryshire – Henry Herbert, 1st Earl of Powis
• Lord Lieutenant of Pembrokeshire – Sir William Owen, 4th Baronet
• Lord Lieutenant of Radnorshire – Edward Harley, 4th Earl of Oxford and Earl Mortimer
• Bishop of Bangor – John Ewer
• Bishop of Llandaff – Shute Barrington
• Bishop of St Asaph – Jonathan Shipley
• Bishop of St Davids – Charles Moss

Events

• September - Sir Watkin Williams-Wynn, 4th Baronet, holds his legendary coming-of-age party, to which 15,000 guests are invited. Three coachloads of cooks are sent from London to provide the refreshments, and a hall is built especially for the occasion at Wynnstay.
• Approximate date - Bridge at Pontardawe built by William Edwards.

Arts and literature

New books

• Robert Jones - Lleferydd yr Asyn
• Thomas Meredith - An Illustration of Several Texts of Scripture
• John Walters - A Dissertation on the Welsh Language
• Sir John Wynn, 1st Baronet - ''History of the Gwydir Family''

Music

• Daines Barrington - ''Some Account of Two Musical Instruments Used in Wales''

Births

• 15 January - Sir John Edwards, 1st Baronet, of Garth, politician
• 8 April - John Jenkins (Ifor Ceri), antiquarian
• 14 April - John Evans, explorer
• 30 April - David Thompson, explorer

Deaths

• 13 January - Howel Davies, Methodist leader, about 54
• 19 June - Thomas Williams, Congregational minister, about 45
• 8 August - John Jones, clergyman and author, 70