| Named By: | Joseph Leidy in 1871 |
| Time Period: | Eocene |
| Location: | Seemingly across northern Eurasia and North America with countries including England, France, Germany, Jamaica, Japan Spain, Switzerland and the USA |
| Size: | Up to about 1.5 meters long |
| Diet: | Herbivore |
| Fossil(s): | Remains of well over 100 individuals |
| Classification: | | Chordata | Mammalia | Perissodactyla | Hyrachyidae | |
| Also known as: | | Chasmotherium | Colonoceras | Hyrachyus agrarius | Hyrachyus agrestis | Hyrachyus bairdianus | Hyrachyus crassidens | Hyrachyus hypostylus | Hyrachyus imperialis | Hyrachyus princeps | Ephyrachyus | Isectolophus modestus | Lophiodon affinis | Lophiodon bairdianus | Lophiodon modestus | Metahyrachyus | |
Hyrachyus (from Hyrax and Ancient Greek: us "pig") is an extinct genus of perissodactyl mammal that lived in Eocene Europe, North America, and Asia. Its remains have also been found in Jamaica. It is closely related to Lophiodon.