General George Augustus Herbert, 11th Earl of Pembroke and 8th Earl of Montgomery KG PC (10 September 1759 – 26 October 1827) was an English peer, army officer, and politician.
Born Lord Herbert at the family home, Wilton House in Wilton, he was the only son of Henry Herbert, 10th Earl of Pembroke and 7th Earl of Montgomery and his wife, Elizabeth, the second daughter of Charles Spencer, 3rd Duke of Marlborough. He had a younger sister Charlotte, who died at the age of 10. He was educated at home and then Harrow School from 1770 to 1775. Through his grandmother Mary FitzWilliam, daughter of the 5th Viscount FitzWilliam, he inherited the substantial FitzWilliam estates in Dublin.
After leaving Harrow, Herbert was appointed an ensign in the 12th Regiment of Foot in 1775 and travelled the continent over the next five years, visiting France, Austria, Eastern Europe, Russia and Italy with Rev. William Coxe and Capt. John Floyd.
Herbert was promoted to a lieutenant in 1777 and became a captain in the 75th Regiment of Foot in 1778, before transferring to 1st The Royal Dragoons later that year. In 1781, he transferred to the 22nd Light Dragoons and the following year was promoted to a lieutenant-colonel in the 2nd Dragoon Guards.