Diiodide may refer to:
Titanium diiodide, TiI2 Vanadium diiodide, VI2 Chromium diiodide, CrI2 Iron diiodide, FeI2 Cobalt diiodide, CoI2 Nickel diiodide, NiI2 Germanium diiodide, GeI2 Molybdenum diiodide, MoI2 Palladium diiodide, PdI2 Tin diiodide, SnI2 Lanthanum diiodide, LaI2 Cerium diiodide, CeI2 Praseodymium diiodide, PrI2 Neodymium diiodide, NdI2 Samarium diiodide, SmI2 Europium diiodide, EuI2 Gadolinium diiodide, GdI2 Dysprosium diiodide, DyI2 Thulium diiodide, TmI2 Ytterbium diiodide, YbI2 Tungsten diiodide, WI2 Osmium diiodide, OsI2 Mercury diiodide, HgI2 Lead diiodide, PbI2 Thorium diiodide, ThI2 Americium diiodide, AmI2 Californium diiodide, CfI2