Europium(III) chloride is an inorganic compound with the formula EuCl3.

Being hygroscopic it rapidly absorbs water to form a white crystalline hexahydrate, EuCl3·6H2O, which is colourless.

Treating Eu2O3 with aqueous HCl produces hydrated europium chloride (EuCl3·6H2O).

[3] These methods produce (NH4)2[EuCl5]: The pentachloride decomposes thermally according to the following equation: The thermolysis reaction proceeds via the intermediary of (NH4)[Eu2Cl7].

[4] The reaction is performed in THF and requires a period at reflux.