William Pitt, 1st Earl of Chatham, English politician, Prime Minister of Great Britain (born 1708)

William Pitt, 1st Earl of Chatham 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.

The prime minister of the United Kingdom is the head of government of the United Kingdom. The prime minister advises the sovereign on the exercise of much of the royal prerogative, chairs the Cabinet, and selects its ministers. Modern prime ministers hold office by virtue of their ability to command the confidence of the House of Commons, so they are invariably members of Parliament.

May 11 is the 131st day of the year in the Gregorian calendar; 234 days remain until the end of the year.