Neodymium(III) oxalate is the oxalate salt of neodymium, with the chemical formula of Nd<sub>2</sub>(C<sub>2</sub>O<sub>4</sub>)<sub>3</sub> in the anhydrous or hydrate form. Its decahydrate decomposes to the anhydrous form when heated, and when heated further, decomposes to Nd<sub>2</sub>O<sub>2</sub>C<sub>2</sub>O<sub>4</sub>, finally obtaining neodymium(III) oxide. It dissolves in hydrochloric acid to form Nd(C<sub>2</sub>O<sub>4</sub>)Cl÷3H<sub>2</sub>O.