Havet is a French-language surname, which may refer to:
Armand Havet (1795–1820), French botanist.
Eugène Auguste Ernest Havet (1813–1889), French scholar
Louis Havet (1849–1925), French philologist
Julien Havet (1853–1893), French historian
Mireille Havet (1898–1932), French poet, diarist, novelist, and lyricist