Thallium chloride is an inorganic compound with the chemical formula TlCl, which is composed of thallium and chlorine. Thallium is a silvery-white metal, whereas thallium chloride is a white solid that is highly hygroscopic. It can be dissolved in water and many organic solvents.

- Industrial field: Thallium chloride can be used in the manufacture of glass, ceramics, dyes, medicine, pesticides, gunpowder, fireworks, photography, electronics, optics, nuclear industry, etc.

- Other fields: Some compounds of thallium chloride, such as thallium chloride, can also be used for insecticide, bactericide, rodenticide, etc.