Hexaiodobenzene is an aryl iodide and a six-substituted iodobenzene with the formula C6I6.

It forms orange crystals[1] that are poorly soluble in all solvents.

It adopts the expected structure with a central C6 ring.

[5] Hexaiodobenzene forms orange needles that are practically insoluble in water, but sparingly soluble in N-methyl-2-pyrrolidone and dimethyl sulfoxide.

The carbon atoms lie in a plane with C–C distances about 141 pm, while the nearby iodine atoms show very small displacements (about 4 pm) above and below the ring.