| Named By: | Othniel Charles Marsh in 1875 |
| Time Period: | Middle Eocene - Early Oligocene |
| Location: | Canada & USA |
| Size: | 60 centimetres (6 hands) high at the shoulder |
| Diet: | Herbivore |
| Fossil(s): | Multiple specimens |
| Classification: | | Chordata | Mammalia | Perissodactyla | Equidae | Anchitheriinae | |
| Also known as: | | Anchitherium celer | Mesohippus celer | Mesohippus hypostylus | Mesohippus latidens | Mesohippus portentus | Mesohippus praecocidens | Mesohippus trigonostylus | Mesohippus viejensis | Miohippus celer | Pediohippus portentus | Pediohippus trigonostylus | |
Mesohippus (Greek: meso/meso meaning "middle" and ippos/hippos meaning "horse") is an extinct genus of early horse. It lived some 30 to 40 million years ago from the Middle Eocene to the Early Oligocene. Like many fossil horses, Mesohippus was common in North America.