Bledri ap Cydifor (fl. 1116–1130) was a Welsh chieftain who ruled Dyfed. He was the son of Cydifor (or Cedifor) Fawr ("the great"), a previous ruler of the same region. Bledri's sister, Ellylw, was one of the many lovers of Cadwgan ap Bleddyn, the prince of Powys, and was said to have had a child by him. Bledri ap Cydifor is sometimes confused with an earlier Bledri, who was Bishop of Llandaff in the late 10th century.