Palaeotheriidae is an extinct family of herbivorous perissodactyl mammals related to tapirs and rhinoceros, and probably ancestral to horses. They ranged across Europe and Asia during the Eocene through Oligocene 55—28 Ma, existing for approximately .

Palaeotheriidae is an extinct family of herbivorous perissodactyl mammals related to tapirs and rhinoceros, and probably ancestral to horses. They ranged across Europe and Asia during the Eocene through Oligocene 55—28 Ma, existing for approximately .