Cophixalus tagulensis is a species of frog in the family Microhylidae.

[1] The holotype, an adult male, measured 17.7 mm (0.70 in) in snout–vent length.

[2] Its natural habitat is tropical moist lowland forests.

[1] The types were collected on the west slope of Mount Riu at elevations of about 250–350 m (820–1,150 ft) above sea level.

[2] No significant threats are known; the forests on Tagula were logged about 100 years ago but have since recovered.