The Grenvillites or Grenvilles were a name given to several British political factions of the 18th and early-19th centuries, all associated with the important Grenville family of Buckinghamshire.
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Notable members of the group included Lord Spencer, Lord Fitzwilliam, William Windham, and Buckingham and Grenville's older brother Thomas Grenville.
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After Lord Temple's death in 1779, George Grenville's sons, George Nugent-Temple-Grenville, 3rd Earl Temple (from 1784 the Marquess of Buckingham), and William Wyndham Grenville became the principle figures in the Grenville family interest.
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While Temple quit the government in protest, his younger brother, George Grenville, remained in the government, now dominated by King George III's favorite, Lord Bute, and served as Leader of the House of Commons.