Niobia may refer to: Niobia Bryant, American novelist of romance and mainstream fiction Niobia (cnidarian), a genus of cnidarians in the family Niobiidae Three forms of niobium oxide: Niobium monoxide (niobium(II) oxide), NbO Niobium dioxide (niobium(IV) oxide), NbO2 Niobium pentoxide (niobium(V) oxide), Nb2O5