William Pitt
William Pitt is most likely to refer to:
- William Pitt, 1st Earl of Chatham (1708–1778), Prime Minister of Great Britain 1766–1768; often known as William Pitt the Elder
- William Pitt the Younger (1759–1806), his son and Prime Minister of Great Britain 1783–1801 and 1804–1806
William Pitt may also refer to:
People
- William Pitt (courtier) (1559–1636), English courtier and politician who sat in the House of Commons between 1614 and 1625
- William Augustus Pitt (c. 1728–1809), British general
- William Pitt Kalanimoku (1768–1827), Prime Minister of Kamehameha the Great who adopted the name of the British Prime Minister at the time
- William Pitt Leleiohoku I (1821–1848), husband of Princess Hariett Nahienaena and Princess Ruth Keelikolani and son of Kalanimoku
- John William Pitt Kīnaʻu (1842–1859), prince of Hawaii and son of Keelikolani and Chief Leleiohoku
- William Pitt Leleiohoku II (1854–1877), Crown Prince of Hawaii and heir apparent of King David Kalakaua
- William Baker Pitt (1856–1936), founder of Swindon Town F.C. and Catholic prebendary
- William Rivers Pitt (born 1971), left-wing American essayist
- William Pitt (architect) (1855–1918), Australian 19th century architect
- William Pitt (engineer) (1840–1909), Canadian inventor of the underwater cable ferry in the early 1900s
- William Pitt (Mormon) (1813–1873), early Mormon bandleader
- William Pitt (ship-builder) (died 1840), author of The Sailor's Consolation
- William Pitt (cricketer) (1800–1871), English cricketer
- Bill Pitt (born 1937), British politician and Liberal Member of Parliament for Croydon North West, 1981–1983
- Bill Pitt (racing driver), former Australian racing driver and motor racing official
- Brad Pitt (William Bradley Pitt, born 1963), American actor
- William Pitt (singer), American singer
Other uses
- William Pitt Union, the student union at the University of Pittsburgh
- William Pitt Debating Union, a debating society at the University of Pittsburgh
- William Pitt (1804), a sailing ship built and launched in Liverpool in 1804