Rhenium tetraiodide is a binary chemical compound of rhenium and iodide with the chemical formula .
Rhenium tetraiodide can be obtained via the reduction of perrhenic acid with hydrogen iodide:
Rhenium tetraiodide forms black solid substance which is soluble in acetone and ether. Hydrolyzed by water, hygroscopic.
Rhenium tetraiodide is hydrolyzed by water:
Rhenium tetraiodide decomposes when heated: