William Pitt most commonly refers to:
William Pitt, 1st Earl of Chatham (1708–1778), British statesman; often known as William Pitt the ElderWilliam Pitt the Younger (1759–1806), his son and Prime Minister of Great Britain (1783–1801 and 1804–1806)William Pitt may also refer to:
William Pitt (courtier) (1559–1636), English courtier and politician who sat in the House of Commons (1614–1625)William Augustus Pitt (c. 1728–1809), British generalWilliam Pitt Kalanimoku (1768–1827), chief minister to King Kamehameha IWilliam Pitt Leleiohoku I (1821–1848), son of KalanimokuJohn William Pitt Kinau (1842–1859), prince of Hawaii and son of Leleiohoku IWilliam Pitt Leleiohoku II (1854–1877), Crown Prince of HawaiiWilliam Baker Pitt (1856–1936), founder of Swindon Town F.C. and Catholic prebendaryWilliam Fox-Pitt (born 1969), English equestrianWilliam Morton Pitt (1764–1836), British politician and MP for Poole (1780–1790) and Dorset (1790–1826)William Rivers Pitt (born 1971), left-wing American essayistWilliam Pitt (architect) (1855–1918), Australian 19th-century architectWilliam Pitt (engineer) (1840–1909), Canadian inventor of the underwater cable ferry in the early 1900sWilliam Pitt (Mormon) (1813–1873), early Mormon bandleaderWilliam Pitt (ship-builder) (died 1840), author of The Sailor's ConsolationWilliam Pitt (cricketer) (1800–1871), English cricketerBill Pitt (politician) (born 1937), British politician and MP for Croydon North West (1981–1983)Bill Pitt (racing driver), Australian racing driver and motor racing officialBrad Pitt (born 1963), American actorWilliam Pitt (singer), American singer