Tungsten(II) iodide is an iodide of tungsten, with the chemical formula [W6I8]I4, or abbreviated as WI2.

Tungsten diiodide can obtained from the decomposition from tungsten(III) iodide:[1] It can also be formed by the displacement reaction of tungsten(II) chloride and iodine:[1] It can also be formed by the direct reaction of tungsten and iodine, which is a reversible reaction.

[3] Tungsten(II) iodide can also be obtained by reacting tungsten hexacarbonyl with iodine.

[4] Tungsten(II) iodide is a dark brown-colored solid that is stable in air and moisture.

Its structure is the same as tungsten(II) chloride, crystallising orthorhombic crystal system, with space group Bbem (No.