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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