Robert Stanley "Butch" May, Jr. (born November 7, 1941 in Honolulu, Hawaii) is an American former volleyball player who competed in the 1968 Summer Olympics, as well as being father to multiple Olympic gold medal American beach volleyball player, Misty May-Treanor. Butch grew up in Honolulu, Hawaiʻi and attended St. Louis School, a private school for boys.