The southern Rocky Mountain wolf (Canis lupus youngi) is an extinct subspecies of gray wolf which was once distributed over southeastern Idaho, southwestern Wyoming, northeastern Nevada, Utah, western and central Colorado, northwestern Arizona (but north of the Grand Canyon), and northwestern New Mexico.

It was a light-colored, medium-sized subspecies closely resembling the Great Plains wolf (C. l. nubilus), though larger, with more blackish-buff hairs on the back.

This wolf is recognized as a subspecies of Canis lupus in the taxonomic authority Mammal Species of the World (2005).

[4] A 2005 study compared the mitochondrial DNA sequences of modern wolves with those from 34 specimens dated between 1856 and 1915.

The wide distribution area of the southern clade indicates that gene flow was extensive across the recognized limits of its subspecies.