Kalophrynus subterrestris is a species of frog in the family Microhylidae.

It endemic to Borneo where it is known from Sabah and Sarawak (Malaysia),[3][4] although it is also presumed to be present in Kalimantan (Indonesia) and Brunei.

The dorsum is dark gray, without darker or lighter markings.

[2][4] Natural habitats of Kalophrynus subterrestris are lowland, tropical moist forests below 300 m (980 ft) above sea level.

[1] They typically occur under leaf litter or in burrows (hence the specific name subterrestris).