| Birth Date: | 5 May 1909 |
| Birth Place: | Larne, Northern Ireland |
| Death Date: | 24 September 1988 (aged 79) |
| Death Place: | Falls Church, Virginia, U.S. |
| Sport: | Equestrianism |
| Show-Medals: | yes |
Arthur John McCashin (5 May 1909 – 24 September 1988) was an American equestrian. He won a bronze medal in team show jumping at the 1952 Olympics and placed 12th individually. After retiring from competitions he became a riding course designer, and for many years planned the circuit at the New York's National Horse Show. During World War II he served as a pilot in a supply service for the armed forces.[1]