The Ceram rat (Nesoromys ceramicus), also known as the Seram Island mountain rat, is a species of rodent in the family Muridae. It is found only in Seram Island, Indonesia, where it has been recorded on Mount Mansuela. It is the only species of its genus, Nesoromys.
Nesoromys ceramicus is a small, dark brown- or olive-colored rat. The dorsal side is darker and speckled. The rat has short, dark ears and a long tail.