Samarium(III) iodide is an inorganic compound, a salt of samarium and hydroiodic acid with the chemical formula SmI3.

[1][2] Samarium(III) iodide is prepared by the reaction of metallic samarium and iodine:[3] Samarium(III) iodide is a yellow powder that is unstable in air and decomposes in water (hydrolysis).

[1] When heated with metallic samarium, it forms samarium diiodide:[4] Reduction by hydrogen also affords samarium diiodide upon heating: The compound is commercially available and used in organic reactions as a catalyst.

[1]