John Patrick Lionel Petre, 18th Baron Petre, is a British peer and landowner who was the Lord Lieutenant of Essex, succeeding Robin Neville, 10th Baron Braybrooke in October 2002. He is the 18th Baron of the Petre family, an old recusant family.
- Occupation
- politician, farmer, land owner
- Position held
- Lord Lieutenant of Essex, member of the House of Lords
- Citizenship
- United Kingdom
- Born
- August 4, 1942
