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
Similar names
- William Petyt (1641–1707) English Whig lawyer and writer.
- William Petit (born 1956), American former physician and politician.
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