| Named By: | Edward Drinker Cope in 1892 |
| Time Period: | Middle Pliocene to Late Pleistocene |
| Location: | Mexico and across the USA |
| Size: | Between 110 - 145 centimetres tall at the shoulder |
| Diet: | Herbivore |
| Fossil(s): | Remains of well over 100 individuals, some of which are almost complete |
| Classification: | | Chordata | Mammalia | Perissodactyla | Equidae | |
| Also known as: | | Asinus pons | Equus pons | Equus shoshonensis | Hippotigris simplicidens | Plesippus shoshonensis | |
The Hagerman horse (Equus simplicidens), also called the Hagerman zebra or the American zebra, was a North American species of equid from the Pliocene epoch and the Pleistocene epoch. It was one of the oldest horses of the genus Equus and was discovered in 1928 in Hagerman, Idaho. It is the state fossil of Idaho.