Terbium(III) nitrate is an inorganic chemical compound, a salt of terbium and nitric acid, with the formula Tb(NO3)3.

[2] Terbium(III) nitrate can be prepared by dissolving terbium(III,IV) oxide in a mixture of aqueous HNO3 and H2O2 solution.

[3] Terbium(III) nitrate can be obtained by reacting terbium(III) oxide with nitric acid and crystallizing then drying the crystals with 45~55% sulfuric acid to obtain the hexahydrate.

[4] It reacts with NH4HCO3 to produce Tb2(CO3)3 along with its basic carbonate.

[5] It forms Tb(NO3)2−5 in CH3CN with excess nitrate anions.