Macruromys is a genus of rodent in the family Muridae endemic to New Guinea. It contains the following species:

• Lesser small-toothed rat (M. elegans)
• Eastern small-toothed rat (M. major)

• Musser, G. G.; Carleton, M. D. (2005). "Superfamily Muroidea". In Wilson, D. E.; Reeder, D. M. (eds.). Mammal Species of the World: A Taxonomic and Geographic Reference (3rd ed.). Johns Hopkins University Press. pp. 1352–1353. ISBN 978-0-8018-8221-0. OCLC 62265494.