Jack "Hacksaw" Reynolds (born November 22, 1947) is an American former football player who played for the University of Tennessee, first as a fullback and then moving to linebacker. He was a first-round draft pick by the Los Angeles Rams in the 1970 NFL Draft and played there 11 years before going to the San Francisco 49ers in 1981. He played with the Niners four more years and won two Super Bowls with them: Super Bowl XVI and Super Bowl XIX. He wore the number 64 throughout his career, and played in a total of 13 postseason games, including two Pro Bowls.