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 astronomer
• 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

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