Harrington's mountain goat (Oreamnos harringtoni) was a species of caprine that resided in the Southwest of North America during the Pleistocene epoch.

[2] Stock based his initial description on finds of skull fragments and metapodial bones from Smith Creek Cave in the Great Basin of Nevada.

[2] In 1937 he authored a Bulletin of the Southern California Academy of Sciences article titled "A new mountain goat from the Quaternary of Smith Creek Cave, Nevada".

[2] Dung finds suggest that the goats frequented caves in the Grand Canyon during spring and possibly late winter and early summer.

[4] The extinction is known to have coincided with the disappearance of at least 25 genera of land mammals,[2] such as the Shasta ground sloth (Nothrotheriops shastensis), and the arrival of Native American hunters of the Clovis culture in the region.