Micromys is a genus of small rodents in the subfamily Murinae. The genus, which is not closely related to any other murine genus, contains two living species: the widespread Eurasian harvest mouse (Micromys minutus) of much of Europe and Asia; and the more restricted Micromys erythrotis of Vietnam, southern China, and perhaps nearby regions. Fossils of Micromys date back to the Late Miocene and include at least 10 extinct species, which form several lineages.