Earl of Powis (Powys) is a title that has been created three times. The first creation came in the Peerage of England in 1674 in favour of William Herbert, 3rd Baron Powis, a descendant of William Herbert, 1st Earl of Pembroke (c. 1501–1570). In 1687, he was further honoured when he was made (and as detailed at the article of) Marquess of Powis.
The title was created again in 1748 in the Peerage of Great Britain for Henry Arthur Herbert, the husband of Barbara, daughter of Lord Edward Herbert, brother of William, 3rd Marquess of Powis. He notably represented Bletchingley and Ludlow in Parliament and served as Lord Lieutenant of Montgomeryshire and Shropshire. Herbert had already been created Baron Herbert of Chirbury in 1743 and was made Baron Powis and Viscount Ludlow at the same time he was given the earldom. In 1749 he was also created Baron Herbert of Chirbury and Ludlow, with remainder firstly to his brother Richard Herbert and secondly to his kinsman Francis Herbert, of Ludlow. His son, the second Earl, was also Lord Lieutenant of Montgomeryshire and Shropshire. However, on his death in 1801 all the titles became extinct (the persons in remainder to the 1749 barony had died without heirs before the 2nd Earl).