Dysprosium(III) nitrate is an inorganic compound, a salt of dysprosium and nitric acid with the chemical formula Dy(NO3)3.

[2] Anhydrous salt is obtained by the action of nitrogen dioxide on dysprosium(III) oxide:[3] The action of nitrogen dioxide on metallic dysprosium: Dysprosium(III) nitrate forms yellowish crystals.

[4] The anhydrous nitrate forms a crystalline hydrate in wet air with the ideal composition of Dy(NO3)3·5H2O, which melts in its own crystallization water at 88.6 °C.

[5][6] All hydrates (anhydrous, pentahydrate, and hexahydrate) are soluble in water and ethanol, hygroscopic.

Hydrated dysprosium nitrate thermally decomposes to form DyONO3,[citation needed] and further heating produces dysprosium oxide.