Frank Legacki (1939 – October 22, 2020) was an American championship swimmer. He won two individual, one relay, and two team NCAA swimming championships between 1959 and 1961 and set American records in the 50-yard freestyle. He was also a two-time National A.A.U. Champion in the 100 Butterfly and set American records in this event, too. He was inducted into the University of Michigan Athletic Hall of Honor in 1994.