Samarium(III) chloride, also known as samarium trichloride, is an inorganic compound of samarium and chloride. It is a pale yellow salt that rapidly absorbs water to form a hexahydrate, SmCl3.6H2O. The compound has few practical applications but is used in laboratories for research on new compounds of samarium.

Samarium Chloride has specialized uses in glass, phosphors, lasers, and thermoelectric devices. Samarium Chloride is used for the preparation of Samarium metal, which has a variety of uses, notably in magnets. 

Anhydrous SmCl3 is mixed with Sodium Chloride or Calcium Chloride to give a low melting point eutectic mixture. Electrolysis of this molten salt solution gives the free metal. 

Samarium Chloride can also be used as a starting point for the preparation of other Samarium salts.