Nematoserica is a genus of beetle of the family Scarabaeidae. It is monotypic, being represented by the single species, Nematoserica coerulea, which is found in Malaysia (Sarawak).
Adults reach a length of about 5-5.5 mm. They are bright blue or greenish-blue. The upper surface is silky and sub-opaque, with the clypeus alone shining, the margin of the latter broadly reflexed. The elytra are sulcate and the sulci contain rather coarse but shallow punctures.