The electrical conductivity of three alkali metal chlorluminates has been investigated from room temperature to above the melting point. Ionic conductivities at 25°C are 1.2 × 10−6, 3.5 × 10−7 and 3.2 × 10−9omh−1 cm−1, and activation enthalpies are 0.47, 0.46 and 0.53 eV for LiAlCl4, NaAlCl4 and KAlCl4.