The distinguished Oldfield mouse (Thomasomys notatus) is a species of rodent in the family Cricetidae. It is found only in Peru.

References

• Musser, G. G. and M. D. Carleton. 2005. Superfamily Muroidea. pp.894–1531 in Mammal Species of the World a Taxonomic and Geographic Reference. D. E. Wilson and D. M. Reeder eds. Johns Hopkins University Press, Baltimore.