Lanthanum stearate is a metal-organic compound, a salt of lanthanum and stearic acid with the chemical formula La(C18H35O2)3.

[1][2] The compound is classified as a metallic soap, i.e. a metal derivative of a fatty acid.

The compound forms a white powder that is soluble in benzene.

[3] Lanthanum stearate is mainly used as a nucleating agent for plastics degradation and heat stabilizer for PVC.

[4][5]