| Frank Duffy | |
| Sport: | Equestrian |
| Birth Date: | 22 January 1937 |
| Birth Place: | Honolulu, Hawaii, United States |
Frank Duffy (born January 22, 1937) is an American equestrian. He competed in two events at the 1956 Summer Olympics. He earned degrees from the University of Michigan and Harvard Medical School.[1]