Taddeo is a masculine given name which may refer to:
Taddeo Alderotti (between 1206 and 1215-1295), Italian doctor and professor of medicine
Taddeo Barberini (1603–1647), Italian nobleman, Prince of Palestrina, nephew of Pope Urban VIII, Gonfalonier of the Church and commander of the Papal Army
Taddeo Carlone (died 1613), Swiss-Italian sculptor and architect
Taddeo Crivelli (fl. 1451, died by 1479), also known as Taddeo da Ferrara, painter of illuminated manuscripts
Taddeo d'Este (c. 1390–1448), condottiere (mercenary leader) almost exclusively in the service of the Republic of Venice
Taddeo di Bartolo, Sienese painter active up to 1422
Taddeo Gaddi (c. 1300–1366), Italian painter
Taddeo Gaddi (cardinal) (1520–1561), Italian Roman Catholic cardinal and bishop
Taddeo Kuntze, Taddeo Polacco and Tadeusz Kuntze, pseudonyms of the Silesian painter Tadeusz Konicz (1733–1793)
Taddeo Landini (c. 1561–1596), Italian sculptor and architect
Taddeo Manfredi (1431–c. 1486), Lord of Imola from 1448 until 1473 and a condottiere (mercenary leader)
Taddeo Sarti (1540-1617), Roman Catholic Bishop of Nepi e Sutri
Taddeo da Suessa or da Sessa (c. 1190/1200–1248), Italian jurist
Taddeo Zuccari or Zuccaro (1529–1566), Italian painter
