Siret is a surname. Notable people with this surname include:
Luis Siret (1860–1934), a Belgian-Spanish archaeologist and illustrator
Nicolas Siret (1663–1754), a French composer and organist
Adolphe Siret (1818–1888), Belgian historian, biographer, essayist, poet and writer
Pierre-Louis Siret (1745–1798), French grammarian and philologist