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

It is endemic to Indonesia and occurs on extreme western Java and on the southeastern tip of Sumatra.

[4] Females lay 30–50 eggs that hatch into non-feeding tadpoles.

It can be found in large numbers during the reproductive season when it breeds in temporary pools on the forest floor.

[1] It is threatened by habitat loss caused by logging and agricultural encroachment, especially on Java.