Thorius omiltemi is a species of salamander in the family Plethodontidae. It is endemic to the Sierra Madre del Sur in Guerrero, Mexico, at elevations of 2,500–2,950 m (8,200–9,680 ft) asl. It is a terrestrial salamander that inhabits pine-oak-fir cloud forest and pine-oak forest. It lives under the bark of fallen tree logs. It is threatened by habitat loss caused by agriculture, logging, and human settlement.