Jean de Montfort or John of Montfort may refer to:
- John I of Montfort (died 1249), count of Montfort
- Jean de Montfort (died 1283), lord of Tyre and of Toron
- Jean de Montfort-Castres (died 1300), count of Squillace (kingdom of Naples), son of Philippe II de Montfort, lord of Castres, and of Jeanne de Lévis-Mirepoix
- John II of Montfort (1294–1345), count of Montfort, contested Duke of Brittany, one of two sides in the Breton War of Succession
- John IV, Duke of Brittany (1339–1399), son of the former, Duke of Brittany from 1364 to 1399, count of Richemont and count of Montfort (1345–1399)
- Jean de Montfort (1385–1414), who later took the name Guy XIII de Laval, Lord of Laval
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