Earl Granville is a title that has been created twice, once in the Peerage of Great Britain and once in the Peerage of the United Kingdom. It is now held by members of the Leveson-Gower family.
The family seat is Callernish House, near Lochmaddy, North Uist.
The first creation came in the Peerage of Great Britain in 1715 when Grace Carteret, Lady Carteret, was made Countess Granville and Viscountess Carteret. She was the daughter of John Granville, 1st Earl of Bath, and the widow of George Carteret, 1st Baron Carteret. The Carteret family descended from the celebrated royalist statesman George Carteret, who had been created a baronet, of Melesches, Jersey, in 1645. It was later intended that he should be elevated to the peerage but he died before the title could be granted. As his eldest son, Philip, predeceased him, the peerage was eventually bestowed on his namesake grandson, George, who was made Baron Carteret, of Hawnes in the County of Bedford, with remainder to his brothers.
Lord Carteret and Lady Granville were both succeeded by their son, the second Earl. He was a prominent statesman, mainly known under the title Lord Carteret. The titles became extinct in 1776 on the death of his son, the third Earl, without heirs. The Carteret estates were passed on to the late Earl's first cousin the Hon. Henry Frederick Thynne, second son of Thomas Thynne, 2nd Viscount Weymouth, and his wife Lady Louisa Carteret, daughter of the second Earl Granville. He assumed the surname of Carteret and was created Baron Carteret in 1784.
The second creation came in the Peerage of the United Kingdom in 1833 when the noted diplomat Granville Leveson-Gower, 1st Viscount Granville, was made Earl Granville and Baron Leveson, of Stone Park in the County of Stafford. He had already been created Viscount Granville, of Stone Park in the County of Stafford, in 1815. Leveson-Gower was the son of Granville Leveson-Gower, 1st Marquess of Stafford, by his third wife Susanna, the younger half-brother of George Granville Leveson-Gower, 1st Duke of Sutherland, and the uncle of Francis Egerton, 1st Earl of Ellesmere. He was also a great-great-nephew of the aforementioned Grace Carteret, 1st Countess Granville. Hence, the 1833 creation of the earldom of Granville was a revival of the title created in 1715.