We describe a tiny megophryid frog Leptobrachella juliandringi sp. nov. from Northeastern to Central Sarawak, Malaysian Borneo. This species is distributed in hilly and montane regions, and has long been confused with L. mjobergi. Based on the assessment using morphological and bioacoustic approaches, we conclude that the new species is distinct from all the other congeneric species including topotypic L. mjobergi from western Sarawak in possessing a series of elongate glands ventrolaterally on the trunk, broken reticulated marking on the ventrum, strap-like lineae masculinae, and an advertisement call with a chirp. The new species is also differentiated phylogenetically from the other congeners, and tends to form a group with true L. mjobergi but with a large genetic divergence.