| Birth Date: | 15 November 1886 |
| Birth Place: | Krokek, Norrköping, Sweden |
| Death Date: | 7 September 1973 (aged 86) |
| Death Place: | Kolmården, Norrköping, Sweden |
| Sport: | Horse riding |
| Club: | K4 IF, Umeå |
| Show-Medals: | yes |
Ernst Gustaf Casparsson (15 November 1886 – 7 September 1973) was a Swedish equestrian who competed in the 1912 Summer Olympics.[1] He and his horse Irmelin finished fifth in the individual eventing competition and won a gold medal with the Swedish eventing team. He also finished sixth in the individual jumping event on the horse Kiriki.
Casparsson was born in a family of seven siblings and grew up on his father's farm in Kolmården. One of his brothers, Otto, became a prominent actor, and sister Elsa was an artist. In 1921 Casparsson purchased the farm, which by then was in a financial trouble, and managed to repay its debt by working both as a farmer and a military officer. In 1924 he married a woman 14 years his junior; the couple had four boys.