"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:

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