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 Le Hardouin (1912-1967), Swiss French-speaking writer and woman of letters