Taddei is an Italian surname. Notable people with the surname include:
Giuseppe Taddei (1916–2010), Italian baritoneMario Taddei (born 1972), Italian historian of scienceMax Taddei (born 1991), Italian professional footballerNazareno Taddei (1920–2006), Italian Jesuit priest, linguist, author and film critic, after whom the Nazareno Taddei Award of the Venice International Film Festival is namedPaolino Taddei (1860–1922), Italian politicianRiccardo Taddei (born 1980), Italian association footballerRodrigo Taddei (born 1980), Brazilian footballerRosa Taddei (1799–1869), Italian actress and poetTaddeo Taddei (1470–1528), Florentine humanist and patron, after whom the Taddei Tondo is namedValdir Antônio Taddei (died 2004), Brazilian zoologist and expert on Neotropical bats