Archaeohippus (Greek: "ancient" (archaios), "horse" (hippos)[3]) is an extinct three-toed member of the family Equidae known from fossils of early Oligocene to middle Miocene age.

[1] Named Anchitherium ultimus the species was described in 1886 by noted paleontologist, E. D. Cope[1] during the height of the Bone wars.

In addition to the occurrences in Florida and Oregon, fossil specimens have been found in Southern Saskatchewan, Canada.

[4] At the other end of its range Archaeohippus have been found as far south as the Miocene Gaillard Cut local in the former canalzone of Panama.

[1] Archaeohippus mannulus and Arachaeohippus blackbergi have been unearthed in Florida, specifically at the Thomas Farm Site.