Lanthanum(III) telluride is an inorganic compound, one of the tellurides of lanthanum, with the chemical formula La2Te3.

Lanthanum(III) telluride is prepared by oxidizing a mixture of lanthanum, tellurium and sodium carbonate at 400 °C.

[1] There are also literature reports on preparing lanthanum(III) telluride using lanthanum(III) chloride and tellurium as raw materials.

In the reaction, tellurium is first oxidized to +4 oxidation state, and then hydrazine hydrate is reduced to −2.

[2] Various phases such as CuLaTe2 and Cu4La2Te5 can be formed in the La2Te3-Cu2Te system.