The moon-toothed degu (Octodon lunatus) is a species of rodent in the family Octodontidae.

[2] It is endemic to Chile, occurring in mountainous areas along the Pacific coast in the central part of the country.

[4] The ventral fur of this species has been found to be much less reflective of UV light than other octodontids,[5] most likely as a result of its nocturnal habits.

[6] The species is less widely distributed in Chile than the common degu and inhabits dense scrubland near the coast.

[3] Habitat ranges from sea level to 1,200 m in the Andes.