Khieu Samphan (Khmer: ខៀវ សំផន, born July 27, 1931) was the president of the state presidium of Democratic Kampuchea (Cambodia) from 1976 until 1979. As such, he served as Cambodia's head of state and was one of the most powerful officials in the Khmer Rouge movement, though Pol Pot was the group's true political leader and held the most extensive power.