Rhodium(III) iodide is an inorganic compound with the formula RhI3.

The structure consists of cubic close-packed iodide ions and rhodium ions filling a third of the octahedral interstices, forming a layers.

[2] Rhodium(III) iodide is only known in the anhydrous form.

Unlike the other rhodium(III) halides, it does not form hydrates.

[1] The related anion [RhI6]3− was previously thought not to form[1] but has since been prepared by diffusion of RhCl3·3H2O through a layer of hydroiodic acid into piperazine.