Peromycus schmidlyi Bradley et al., 2004, is a Reithrodontomyine (formally Peromyscini) rodent commonly called Schmidly's deermouse. It is endemic to Mexico, known only from Durango, Sinaloa, and Sonora at elevations greater than 2,000 m. It inhabits rocky hillsides in the pine-oak forest regions of the northern and central portions of the Sierra Madre Occidental. P. schmidlyi is a member of the P. boylii species group and is closely related to P. beatae and P. levipes. At this time, it is not considered to be a species deserving special conservation concern.