Microhyla borneensis (junior synonym Microhyla nepenthicola), also known as the Matang narrow-mouthed frog, is a species of microhylid frog found in the Matang Range in Sarawak, Borneo. It was once the smallest known frog from the Old World (since 2012, the record holder has been Paedophryne amauensis from New Guinea). Adult males of this species generally have a snout–vent length (SVL) in the range of 10.6–12.8 mm (0.42–0.50 in), but may reach a maximum of 13 mm (0.51 in). Adult females have an SVL of 16–19 mm (0.63–0.75 in). The tadpoles measure just 3 mm.

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