William Pitt

William Pitt most commonly refers to:
 * William Pitt, 1st Earl of Chatham (1708–1778), a.k.a. William Pitt the Elder, British prime minister (1766–1768)
 * William Pitt the Younger (1759–1806), son of the above and British prime minister (1783–1801, 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 general
 * William Pitt Amherst, 1st Earl Amherst (1773–1857), Governor-General of India between 1823 and 1828
 * William Pitt Kalanimoku (1768–1827), chief minister to King Kamehameha I
 * William Pitt Leleiohoku I (1821–1848), son of Kalanimoku
 * John William Pitt Kinau (1842–1859), prince of Hawaii and son of Leleiohoku I
 * William Pitt Leleiohoku II (1854–1877), Crown Prince of Hawaii
 * William Baker Pitt (1856–1936), founder of Swindon Town F.C. and Catholic prebendary
 * William Fox-Pitt (born 1969), English equestrian
 * William Morton Pitt (1764–1836), British politician and MP for Poole (1780–1790) and Dorset (1790–1826)
 * 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
 * William Pitt Murray (1825–1910), American lawyer and politician
 * Bill Pitt (politician) (1937–2017), British politician and MP for Croydon North West (1981–1983)
 * Bill Pitt (racing driver) (born 1926), Australian racing driver and motor racing official
 * Brad Pitt (William Bradley Pitt, born 1963), American actor
 * William Pitt (singer), American singer
 * William Pitt, a list of ships with the name
 * William Pitt, a three-decker sailing ship
 * William Pitt, an East Indiaman