Niobia

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