Dysprosium(III) iodide is a binary inorganic compound of dysprosium and iodine with the chemical formula DyI3.

[1] 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[2] that is soluble in water.

[3] 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.