This article is about the particular significance of the year 1766 to Wales and its people.

Incumbents

• Prince of Wales - George, Prince Regent
• Princess of Wales - vacant

Events

• February 19 - Thomas Kymer is granted an Act of Parliament allowing him to construct the Kidwelly and Llanelly Canal.
• May 12 - Sir Roger Mostyn, 5th Baronet, marries Margaret, daughter of Rev Hugh Wynn and heiress to the Bodysgallen estate.
• John, Lord Mountstuart marries Charlotte Jane, granddaughter of Thomas Windsor, 1st Viscount Windsor.

Arts and literature

New books

• David Jones of Trefriw (ed.) - Cydymaith Diddan
• John Roberts (Si n Robert Lewis) - Drych y Cristion
• Anna Williams - Miscellanies in Prose and Verse

Music

Births

• March - William Turner, industrialist (d. 1853)
• December 6 - Robert Williams (Robert ap Gwilym Ddu), poet (d. 1850)
• December 25 - Christmas Evans, preacher (d. 1838)

Deaths

• November 17 - Morgan Morgan, 78, Welsh-born American colonist