Hardouin is used as both a surname and a given name. Notable people with the name include:
- Hardouin (archbishop), Archbishop of Tours from 960 to 980
- Hardouin de Graetz, or Ortwin (1475–1542), German scholar and theologian
- Hardouin Mansart, or Jules Hardouin Mansart (1646–1708), French architect
- Charles Hardouin (1694-1718), French operatic baritone
- Jean Hardouin (1646–1729), French classical scholar
- Jean-Louis Hardouin Michelin de Choisy, French malacologist and palaeontologist
- Maria Hardouin (1864-1954), Italian noblewoman, wife of Gabriele D'Annunzio
- Maria Le Hardouin (1912-1967), Swiss French-speaking writer and woman of letters
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