Bunomys prolatus is a rat from the montane forest of Mount Tambusisi in Sulawesi. It has an elongated face, a short tail, and soft grayish-brown fur.
It has an elongated face and short tail. Its fur is long, dense, soft, and grayish brown. The upper surfaces of its feet have dark brown scales, and its front claws are long relative to the digits, ending in curved points.
Known specimens are from a ridge on Mount Tambusisi at about 1,830 m.
Head-and-body length was 15.6–17.9 cm in six adults from Mount Tambusisi.
An extinction-risk assessment has not been added yet.