William Pitt may 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 Augustus Pitt (c. 1728 – 1809), Eighteenth century British general.
• William Baker Pitt (1856–c.1920), founder of Swindon Town F.C. and Catholic prebendary
• William Rivers Pitt (born 1971), left-wing American essayist
• Bill Pitt (born 1937), British politician and Liberal Member of Parliament for Croydon North West 1981–1983
• William Pitt (architect) (1855–1918), Australian 19th century architect
• William Pitt (Canada), inventor of the underwater cable ferry in the early 1900s
• William Pitt (singer), active in the 1980s
• Brad Pitt, Actor (Birth name William Bradley Pitt)

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