Megalonibea is a monospecific genus of marine ray-finned fish belonging to the family Sciaenidae, the drums and croakers. Its only species is Megalonibea fusca which is found in the East China Sea. Although recognised as a valid taxon by FishBase, Catalog of Fishes mentions that it may be a synonym of Protonibea, however, as Protonibea was proposed as a genus by Ethelwynn Trewavas in 1973 that name would be a junior synonym of Megalonibea, and it is treated as such by other authors.

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