John F. Raper, Jr. (June 13, 1913 – June 10, 1993) was a justice of the Wyoming Supreme Court from December 18, 1974, to June 14, 1983. Born in Mapleton, Iowa, Raper received his Juris Doctor from the University of Wyoming in 1936 and undertook the practice of law in Sheridan, Wyoming. He also maintained his law practice into the 1950s. In 1954, Raper was appointed United States Attorney for Wyoming. After a decade in retirement, Raper died in Cheyenne, Wyoming on June 10, 1993. Having also been a colonel in the Wyoming National Guard, the National Guard armory in Cheyenne is named for him.