Taddeo is a masculine given name which may refer to:
Taddeo Alderotti (between 1206 and 1215–1295), Italian doctor and professor of medicine
Taddeo Altini O.S.A. (1609–1685), Roman Catholic Bishop of Civita Castellana e Orte, and Titular Bishop of Porphyreon
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
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