Indium sulfate is primarily used in electroplating processes where indium metal coatings are required for specialized applications. It serves as a source of indium ions in plating baths, enabling the deposition of indium onto surfaces for improved corrosion resistance, solderability, and thermal conductivity. One key application is in the electronics industry, where indium coatings help form reliable electrical contacts and low-melting-point alloys.

It is also used in the preparation of transparent conductive films, particularly indium tin oxide (ITO), which is essential for flat-panel displays, touchscreens, and solar cells. In research and development, indium sulfate finds use in synthesizing indium-containing materials and nanocomposites due to its solubility and stability in aqueous solutions. Additionally, it has niche applications in semiconductor manufacturing and as a dopant in certain optoelectronic devices.