Samarium(III) oxalate is an inorganic compound, a salt of samarium and oxalic acid with the formula Sm2(C2O4)3.

[1] The compound does not dissolve in water, forms a crystalline hydrate with yellow crystals.

[2] Precipitation of soluble samarium salts with oxalic acid:[3] Also a reaction of samarium nitrate and oxalic acid in an aqueous solution: Samarium(III) oxalate forms a crystalline hydrate of the composition Sm2(C2O4)3 • 10H2O with yellow crystals.

Decomposes on heating:[4] Crystalline hydrate Sm2(C2O4)3 • 10H2O decomposes stepwise.

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