Dysprosium(III) iodide is a binary inorganic compound of dysprosium and iodine with the chemical formula .
Dysprosium(III) iodide can be obtained by reacting dysprosium with iodine.
Dysprosium(III) iodide can be obtained using the effect of mercury diiodide on dysprosium filings:
Dysprosium(III) iodide is a hygroscopic yellow-green flaky solid that is soluble in water. The compound has a trigonal crystal structure of the bismuth(III) iodide type with the space group R3.
Dysprosium(III) iodide is used in gas discharge lamps to generate white light.