William Petty (1623–1687) was an English economist, scientist and philosopher.

William Petty may also refer to:

• William Petty, 2nd Earl of Shelburne (1737–1805), great-grandson of William Petty, and Prime Minister from 1782–83
• William Petty-FitzMaurice, Earl of Kerry (1811–1836), grandson of the Prime Minister
• William G. Petty (born 1949), judge of the Virginia Court of Appeals

This disambiguation page lists articles about people with the same name.
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