Potassium hexaiodorhenate is an inorganic chemical compound with the chemical formula K2ReI6.

[2][3] The compound can be prepared by reduction of potassium perrhenate by potassium iodide in concentrated hydrochloric acid:[4] The compound forms black crystals, soluble in warm HI,[clarification needed] methanol, and acetone.

[5] Potassium hexaiodorhenate is hydrolyzed in aqueous solutions.

It decomposes when heated: It reacts with strong acids: