The Papua grassland mosaic-tailed rat (Melomys lutillus), also known as the grassland melomys, is a species of rodent in the family Muridae.It is endemic to the island of New Guinea where it is present from sea level to altitudes of about . It inhabits grassland, gardens and other disturbed areas.[1]
The International Union for Conservation of Nature has assessed its conservation status as being of "least concern". This is because it has a wide range, can tolerate disturbance to its habitat and no particular threats have been identified.[1]