William Petre may refer to:
- William Petre (1505-1572), Secretary of State
- William Petre, 2nd Baron Petre (1575-1637)
- William Petre, 4th Baron Petre (1626-1684)
- William Petre, 11th Baron Petre (1793–1850)
- William Petre, 12th Baron Petre (1817–1884)
- William Petre, 13th Baron Petre (1847–1893)
- William Petre (diplomat), British diplomat on List of Ambassadors from the United Kingdom to the Holy See, resident at Rome 1844-1853
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This disambiguation page lists articles about people with the same name.
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