Indium chloride is an inorganic compound that is mainly divided into two forms, indium dichloride and indium trichloride. Indium dichloride is a hygroscopic, colorless solid with the chemical formula InCl₂ and a molecular weight of 185.72, which is prepared by the reaction of indium trichloride with indium metal. Indium trichloride is a white powder with a chemical formula of InCl₃ and a molecular weight of 221.18, which is prepared by the direct reaction of metal indium and dry chlorine gas.

Indium trichloride (InCl₃) is a colorless or light yellow solid that is hygroscopic and soluble in water and organic solvents. It is a strong acidic substance that reacts with alkali to form the corresponding salt. At high temperatures, [InCl₄]⁻ ions can be formed. One of the main uses of indium chloride is in the preparation of semiconductor materials, which can be used in the production of optoelectronic devices, solar cells, sensors and displays. Indium chloride can also be used in metal coatings, alloy preparation, catalytic reactions, and organic synthesis.