William Pitt, 1st Earl of Chatham

William Pitt, 1st Earl of Chatham (15 November 1708 – 11 May 1778) was a British Whig statesman who served as Prime Minister of Great Britain from 1766 to 1768. Historians call him "Chatham" or "Pitt the Elder" to distinguish him from his son William Pitt the Younger, who also served as prime minister. Pitt was also known as "the Great Commoner" because of his long-standing refusal to accept a title until 1766.

Pitt was a member of the British cabinet and with a brief interlude in 1757, its informal leader from 1756 to 1761, during the Seven Years' War (including the French and Indian War in the American colonies). He again led the ministry, holding the official title of Lord Privy Seal, between 1766 and 1768. Much of his power came from his brilliant oratory. He was out of power for most of his career and became well known for his attacks on the government, such as those on Walpole's corruption in the 1730s, Hanoverian subsidies in the 1740s, peace with France in the 1760s, and the policy toward the American colonies during the 1770s.

Pitt is best known as the wartime political leader of Britain during the Seven Years' War, especially for his single-minded devotion to victory over France, a victory that ultimately solidified Britain's dominance over world affairs. He is also known for his popular appeal, his opposition to corruption in government, his support for the American position in the run-up to the American Revolutionary War, his advocacy of British greatness, expansionism and empire, and his antagonism toward Britain's chief enemies and rivals for colonial power, Spain and France. Marie Peters argues his statesmanship was based on a clear, consistent and distinct appreciation of the value of the Empire.