 The ternary pnictides Li3LaX2 (X = P, As, Sb, Bi) were synthesized by the reaction of the elements in sealed niobium ampoules in a resistance furnace. The new phase Li3LaAs2 was obtained for the first time and completes this pnictide series. The structure of Li3LaAs2 was investigated by X-ray diffraction on a single crystal: Li3LaSb2 type, P3¯