Polonium tetraiodide is a binary inorganic compound of polonium and iodine with the chemical formula PoI4.

[3][4] The compound forms volatile black crystals.

Action of iodine vapor on polonium metal: 2.

Dissolution of polonium dioxide in hydroiodic acid:[6] The compound forms black crystals that are insoluble in water.

The compound reacts with hydroiodic acid to form hexaiodopolonic acid: It can be reduced by hydrogen sulfide to yield polonium metal.