Taddei is an Italian surname. Notable people with the surname include:
Giuseppe Taddei (1916–2010), Italian baritone
Mario Taddei (born 1972), Italian historian of science
Max Taddei (born 1991), Italian professional footballer
Nazareno Taddei (1920–2006), Italian Jesuit priest, linguist, author and film critic, after whom the Nazareno Taddei Award of the Venice International Film Festival is named
Paolino Taddei (1860–1922), Italian politician
Riccardo Taddei (born 1980), Italian association footballer
Rodrigo Taddei (born 1980), Brazilian footballer
Rosa Taddei (1799–1869), Italian actress and poet
Taddeo Taddei (1470–1528), Florentine humanist and patron, after whom the Taddei Tondo is named
Valdir Antônio Taddei (died 2004), Brazilian zoologist and expert on Neotropical bats
