三碘化锑，化学式为SbI₃，常温常压下为红色晶体。其中锑为+3氧化态。三碘化锑被用来作为掺杂热电材料的制备。三碘化锑可以用锑及碘直接反应或用三氧化二锑与氢碘酸反应制得。

三碘化锑在二硫化碳中可以和硫形成加合物

SbCl₃ + 3 S₈ → SbCl₃·3S₈

Antimony triiodide is the chemical compound with the formula SbI₃. This ruby-red solid is the only characterized "binary" iodide of antimony, i.e. the sole compound isolated with the formula Sb_xI_y. It contains antimony in its +3 oxidation state. Like many iodides of the heavier main group elements, its structure depends on the phase. Gaseous SbI₃ is a molecular, pyramidal species as anticipated by VSEPR theory. In the solid state, however, the Sb center is surrounded by an octahedron of six iodide ligands, three of which are closer and three more distant. For the related compound BiI₃, all six Bi—I distances are equal.