Magnesium iodide is an inorganic compound with the chemical formula MgI₂. It is composed of two elements, magnesium and iodine, and usually appears as a colorless or white crystalline solid, with strong hygroscopicity, which can absorb moisture in the air and deliquescent. Magnesium iodide dissolves in water to form a colorless solution.

Magnesium iodide has some industrial applications, such as as as a catalyst in organic synthesis or as a contrast agent in medical imaging. It can also be used as a precursor in the production of other magnesium compounds, as well as as one of the ingredients in some types of pyrotechnic manufacturing.

Magnesium iodide is an inorganic magnesium salt that can be used as a reagent in organic synthesis, and its main uses include:

- Drug synthesis: Magnesium iodide can be used in the synthesis of drugs, for example, magnesium iodide may be required as a raw material or catalyst in the preparation of some drugs.

- Chemical analysis: In chemical analysis, magnesium iodide can be used to detect the presence or amount of certain substances.

- Organic synthesis: It can be used as a reagent to participate in organic synthesis reactions, for example for the synthesis of organic compounds containing specific functional groups.

- Materials science: Magnesium iodide also has some applications in the field of materials science, such as in the preparation of certain materials or as an additive to materials.