Didier of Cahors was a 7th-century bishop and Merovingian royal official of Gallo-Roman descent. Born around 580, he was educated at the Frankish court and served as a treasurer under King Dagobert I. Following the death of his brother, Rusticus, he was appointed to lead the diocese of Cahors in 630. He was known for his extensive involvement in civil administration, his dedication to monasticism, and his significant architectural contributions to the region.