Mus mattheyi is a species of small rodent that is native to Southeast Asia. There are a few synonyms for this species that are commonly used in scientific literature, such as the Himalayan field mouse, the Matthey's mouse, and the Matthey's field mouse. These names all refer to the same species of rodent with distinctive characteristics such as small size, gray fur, and a pointed nose. Despite their small stature, mus mattheyi are able to thrive in a variety of environments including grasslands, forests, and shrublands. They are known for their agility and swift movements, making them difficult to catch and study in the wild.