| Named By: | J. H. Quinn in 1955 |
| Time Period: | Late Miocene-Late Pliocene |
| Location: | Across North America from Canada to Mexico, but particularly well known from the USA |
| Size: | Roughly about 1.5 meters tall at the shoulder, but some variance between species |
| Diet: | Herbivore |
| Fossil(s): | Altogether the remains of well over a hundred individual Dinohippus are known |
| Classification: | | Chordata | Mammalia | Perissodactyla | Equidae | Equinae | Equini | |
| Also known as: | | Dinohippus edensis | Dinohippus muelleri | Dinohippus ocotensis | Dinohippus osborni | Equus mesamexicanus | Hippidium interpolatum | Hippidion spectans | Hippidium spectans | Hippotigris ocotensis | Pliohippus bakeri | Pliohippus coalingensis | Pliohippus edensis | Pliohippus osborni | Protohippus coalingensis | Pliohippus interpolatus | Protohippus interpolatus | Pliohippus leidyanus | Pliohippus spectans | Protohippus muelleri | Protohippus spectans | |
Dinohippus (Greek: Terrible horse) is an extinct herbivorous mammal belonging to the tribe Equini, subfamily Equinae, which was endemic to North America from the late Hemphillian stage of the Miocene through the Zanclean stage of the Pliocene (10.3--3.6 mya) and in existence for approximately 6.7 million years.