Clifford John Prock (March 13, 1929 – July 17, 2012) was an American football coach. He was the head football coach at Harding University in Searcy, Arkansas from 1964 to 1987. He compiled a record of 114–123–7 , retiring as the fifth-winningest active coach in the National Association of Intercollegiate Athletics (NAIA) in 1987.