Ciardi is an Italian surname. Notable people with the surname include:
Benedetta Ciardi (born 1971), Italian astrophysicist Beppe Ciardi (1875–1932), Italian painter Cesare Ciardi (1818–1877), Italian flautist and composer David Ciardi (born 1969), American astrophysicist Emma Ciardi (1879–1933), Italian painter Fabio Cifariello Ciardi (born 1960), Italian composer Francesca Ciardi (born 1954), Italian actress Guglielmo Ciardi (1842–1917), Italian painter John Ciardi (1916–1986), American poet, translator, and etymologist Mark Ciardi (born 1961), American film producer and baseball player