Taddei is an Italian surname. Notable people with the surname include:
Alessandro De Taddei (born 1971), Italian speed skater
Claudio Taddei (1966–2019), Uruguayan-Swiss singer-songwriter and painter
Frédéric Taddeï (born 1961), French journalist and television and radio host
Giuseppe Taddei (1916–2010), Italian baritone
Marco Taddei Né (born 1983), Ivorian football midfielder
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 (1860–1925), Italian politician Patrizia Taddei (born 1948), Sammarinese artist Phillip Taddei (born 1975), American professor Pier Paolo Taddei (born 1949), Sammarinese sports shooter Riccardo Taddei (born 1980), Italian association footballer Rodrigo Taddei (born 1980), Brazilian footballer Rosa Taddei (1799–1869), Italian actress and poet Rossana Taddei (born 1969), Uruguayan singer and composer 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